Print mtime before updating file metadata

2025-10-22 09:42:31 +02:00 · 2023-09-23 13:01:58 +02:00
56 changed files with 2329 additions and 4528 deletions
--- a/.git-blame-ignore-revs
+++ b/.git-blame-ignore-revs
@@ -1 +0,0 @@
-2cf0e060ed126537dd993896b6aa793e2a6b9e80
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -1,10 +0,0 @@
-version: 2
-updates:
-  - package-ecosystem: github-actions
-    directory: /
-    schedule:
-      interval: monthly
-    groups:
-      gh-actions:
-        patterns:
-          - "*"
--- a/.github/workflows/build-and-release.yml
+++ b/.github/workflows/build-and-release.yml
@@ -1,6 +1,6 @@
 name: build-and-release

-on: [push, pull_request]
+on: push

 defaults:
  run:
@@ -13,26 +13,28 @@ jobs:
    strategy:
      fail-fast: false
      matrix:
-        os: [ubuntu-latest, windows-latest, macos-13, macos-latest]
-        python: ["3.11"]
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        python: ["3.9"]
    steps:
-      - uses: actions/checkout@v4

-      - name: Install uv
-        uses: astral-sh/setup-uv@v7
+      - uses: actions/checkout@v3
+
+      - uses: actions/setup-python@v4
        with:
          python-version: ${{ matrix.python }}

      - name: Set up project
-        run: uv sync
+        if: matrix.os != 'windows-latest'
+        run: ./scripts/setup
+
+      - name: Set up project on windows
+        if: matrix.os == 'windows-latest'
+        # For some reason, `pip install --upgrade pip` doesn't work on
+        # 'windows-latest'. The installed pip version works fine however.
+        run: ./scripts/setup --no-pip

      - name: Run checks
-        run: |
-          ./scripts/check
-          ./scripts/format
-
-      - name: Assert no changes
-        run: git diff --exit-code
+        run: ./scripts/check

      - name: Build
        run: ./scripts/build
@@ -43,9 +45,9 @@ jobs:
        run: mv dist/pferd* dist/pferd-${{ matrix.os }}

      - name: Upload binary
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
        with:
-          name: pferd-${{ matrix.os }}
+          name: Binaries
          path: dist/pferd-${{ matrix.os }}

  release:
@@ -55,20 +57,18 @@ jobs:
    steps:

      - name: Download binaries
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v3
        with:
-          pattern: pferd-*
-          merge-multiple: true
+          name: Binaries

      - name: Rename binaries
        run: |
          mv pferd-ubuntu-latest pferd-linux
          mv pferd-windows-latest pferd-windows.exe
-          mv pferd-macos-13 pferd-mac-x86_64
          mv pferd-macos-latest pferd-mac

      - name: Create release
-        uses: softprops/action-gh-release@v2
+        uses: softprops/action-gh-release@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
@@ -76,4 +76,3 @@ jobs:
            pferd-linux
            pferd-windows.exe
            pferd-mac
-            pferd-mac-x86_64
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,103 +22,6 @@ ambiguous situations.

 ## Unreleased

-## Added
- Store the description when using the `internet-shortcut` link format
-
-## 3.8.3 - 2025-07-01
-
-## Added
- Support for link collections.  
-  In "fancy" mode, a single HTML file with multiple links is generated.
-  In all other modes, PFERD creates a folder for the collection and a new file
-  for every link inside.
-
-## Fixed
- Crawling of exercises with instructions
- Don't download unavailable elements.  
-  Elements that are unavailable (for example, because their availability is
-  time restricted) will not download the HTML for the info page anymore.
- `base_url` argument for `ilias-web` crawler causing crashes
-
-## 3.8.2 - 2025-04-29
-
-## Changed
- Explicitly mention that wikis are not supported at the moment and ignore them
-
-## Fixed
- Ilias-native login
- Exercise crawling
-
-## 3.8.1 - 2025-04-17
-
-## Fixed
- Description html files now specify at UTF-8 encoding
- Images in descriptions now always have a white background
-
-## 3.8.0 - 2025-04-16
-
-### Added
- Support for ILIAS 9
-
-### Changed
- Added prettier CSS to forum threads
- Downloaded forum threads now link to the forum instead of the ILIAS thread
- Increase minimum supported Python version to 3.11
- Do not crawl nested courses (courses linked in other courses)
-
-## Fixed
- File links in report on Windows
- TOTP authentication in KIT Shibboleth
- Forum crawling only considering the first 20 entries
-
-## 3.7.0 - 2024-11-13
-
-### Added
- Support for MOB videos in page descriptions
- Clickable links in the report to directly open new/modified/not-deleted files
- Support for non KIT shibboleth login
-
-### Changed
- Remove videos from description pages
- Perform ILIAS cycle detection after processing the transform to allow
-  ignoring duplicated elements
- Parse headings (h1-h3) as folders in kit-ipd crawler
-
-### Fixed
- Personal desktop/dashboard/favorites crawling
- Crawling of nested courses
- Downloading of links with no target URL
- Handle row flex on description pages
- Add `<!DOCTYPE html>` heading to forum threads to fix mime type detection
- Handle groups in cards
-
-## 3.6.0 - 2024-10-23
-
-### Added
- Generic `ilias-web` crawler and `ilias-web` CLI command
- Support for the course overview page. Using this URL as a target might cause
-  duplication warnings, as subgroups are listed separately.
- Support for named capture groups in regex transforms
- Crawl custom item groups as folders
-
-### Fixed
- Normalization of meeting names in cards
- Sanitization of slashes in exercise container names
-
-## 3.5.2 - 2024-04-14
-
-### Fixed
- Crawling of personal desktop with ILIAS 8
- Crawling of empty personal desktops
-
-## 3.5.1 - 2024-04-09
-
-### Added
- Support for ILIAS 8
-
-### Fixed
- Video name deduplication
-
 ## 3.5.0 - 2023-09-13

 ### Added
--- a/CONFIG.md
+++ b/CONFIG.md
@@ -4,11 +4,11 @@ A config file consists of sections. A section begins with a `[section]` header,
 which is followed by a list of `key = value` pairs. Comments must be on their
 own line and start with `#`. Multiline values must be indented beyond their key.
 Boolean values can be `yes` or `no`. For more details and some examples on the
-format, see the [configparser documentation][cp-file]
-([interpolation][cp-interp] is disabled).
+format, see the [configparser documentation][1] ([interpolation][2] is
+disabled).

-[cp-file]: <https://docs.python.org/3/library/configparser.html#supported-ini-file-structure> "Supported INI File Structure"
-[cp-interp]: <https://docs.python.org/3/library/configparser.html#interpolation-of-values> "Interpolation of values"
+[1]: <https://docs.python.org/3/library/configparser.html#supported-ini-file-structure> "Supported INI File Structure"
+[2]: <https://docs.python.org/3/library/configparser.html#interpolation-of-values> "Interpolation of values"

 ## The `DEFAULT` section

@@ -146,7 +146,7 @@ crawler simulate a slower, network-based crawler.

 This crawler crawls a KIT-IPD page by url. The root page can be crawled from
 outside the KIT network so you will be informed about any new/deleted files,
-but downloading files requires you to be within. Adding a short delay between
+but downloading files requires you to be within. Adding a show delay between
 requests is likely a good idea.

 - `target`: URL to a KIT-IPD page
@@ -154,65 +154,6 @@ requests is likely a good idea.
  matches, the given link is downloaded as a file. This is used to extract
  files from KIT-IPD pages. (Default: `^.*?[^/]+\.(pdf|zip|c|cpp|java)$`)

-### The `ilias-web` crawler
-
-This crawler crawls a generic ILIAS instance.
-
-Inspired by [this ILIAS downloader][ilias-dl], the following configurations should work
-out of the box for the corresponding universities:
-
-[ilias-dl]: https://github.com/V3lop5/ilias-downloader/blob/main/configs "ilias-downloader configs"
-
-| University      | `base_url`                              | `login_type` | `client_id`   |
-|-----------------|-----------------------------------------|--------------|---------------|
-| FH Aachen       | https://www.ili.fh-aachen.de            | local        | elearning     |
-| HHU Düsseldorf  | https://ilias.hhu.de                    | local        | UniRZ         |
-| Uni Köln        | https://www.ilias.uni-koeln.de/ilias    | local        | uk            |
-| Uni Konstanz    | https://ilias.uni-konstanz.de           | local        | ILIASKONSTANZ |
-| Uni Stuttgart   | https://ilias3.uni-stuttgart.de         | local        | Uni_Stuttgart |
-| Uni Tübingen    | https://ovidius.uni-tuebingen.de/ilias3 | shibboleth   |               |
-| KIT ILIAS Pilot | https://pilot.ilias.studium.kit.edu     | shibboleth   | pilot         |
-
-If your university isn't listed, try navigating to your instance's login page.
-Assuming no custom login service is used, the URL will look something like this:
-
-```jinja
-{{ base_url }}/login.php?client_id={{ client_id }}&cmd=force_login&lang=
-```
-
-If the values work, feel free to submit a PR and add them to the table above.
-
- `base_url`: The URL where the ILIAS instance is located. (Required)
- `login_type`: How you authenticate. (Required)
-    - `local`: Use `client_id` for authentication.
-    - `shibboleth`: Use shibboleth for authentication.
- `client_id`: An ID used for authentication if `login_type` is `local`. Is
-  ignored if `login_type` is `shibboleth`.
- `target`: The ILIAS element to crawl. (Required)
-    - `desktop`: Crawl your personal desktop / dashboard
-    - `<course id>`: Crawl the course with the given id
-    - `<url>`: Crawl a given element by URL (preferably the permanent URL linked
-      at the bottom of its ILIAS page).  
-      This also supports the "My Courses" overview page to download *all*
-      courses. Note that this might produce confusing local directory layouts
-      and duplication warnings if you are a member of an ILIAS group. The
-      `desktop` target is generally preferable.
- `auth`: Name of auth section to use for login. (Required)
- `tfa_auth`: Name of auth section to use for two-factor authentication. Only
-  uses the auth section's password. (Default: Anonymous `tfa` authenticator)
- `links`: How to represent external links. (Default: `fancy`)
-    - `ignore`: Don't download links.
-    - `plaintext`: A text file containing only the URL.
-    - `fancy`: A HTML file looking like the ILIAS link element.
-    - `internet-shortcut`: An internet shortcut file (`.url` file).
- `link_redirect_delay`: Time (in seconds) until `fancy` link files will
-  redirect to the actual URL. Set to a negative value to disable the automatic
-  redirect. (Default: `-1`)
- `videos`: Whether to download videos. (Default: `no`)
- `forums`: Whether to download forum threads. (Default: `no`)
- `http_timeout`: The timeout (in seconds) for all HTTP requests. (Default:
-  `20.0`)
-
 ### The `kit-ilias-web` crawler

 This crawler crawls the KIT ILIAS instance.
@@ -291,10 +232,10 @@ is stored in the keyring.

 ### The `pass` authenticator

-This authenticator queries the [`pass` password manager][pass] for a username
-and password. It tries to be mostly compatible with [browserpass][browserpass]
-and [passff][passff], so see those links for an overview of the format. If PFERD
-fails to load your password, you can use the `--explain` flag to see why.
+This authenticator queries the [`pass` password manager][3] for a username and
+password. It tries to be mostly compatible with [browserpass][4] and
+[passff][5], so see those links for an overview of the format. If PFERD fails
+to load your password, you can use the `--explain` flag to see why.

 - `passname`: The name of the password to use (Required)
 - `username_prefixes`: A comma-separated list of username line prefixes
@@ -302,9 +243,9 @@ fails to load your password, you can use the `--explain` flag to see why.
 - `password_prefixes`: A comma-separated list of password line prefixes
  (Default: `password,pass,secret`)

-[pass]: <https://www.passwordstore.org/> "Pass: The Standard Unix Password Manager"
-[browserpass]: <https://github.com/browserpass/browserpass-extension#organizing-password-store> "Organizing password store"
-[passff]: <https://github.com/passff/passff#multi-line-format> "Multi-line format"
+[3]: <https://www.passwordstore.org/> "Pass: The Standard Unix Password Manager"
+[4]: <https://github.com/browserpass/browserpass-extension#organizing-password-store> "Organizing password store"
+[5]: <https://github.com/passff/passff#multi-line-format> "Multi-line format"

 ### The `tfa` authenticator

@@ -403,8 +344,7 @@ matches `SOURCE`, the output path is created using `TARGET` as template.
 be referred to as `{g<n>}` (e.g. `{g3}`). `{g0}` refers to the original path.
 If capturing group *n*'s contents are a valid integer, the integer value is
 available as `{i<n>}` (e.g. `{i3}`). If capturing group *n*'s contents are a
-valid float, the float value is available as `{f<n>}` (e.g. `{f3}`). Named capture
-groups (e.g. `(?P<name>)`) are available by their name (e.g. `{name}`). If a
+valid float, the float value is available as `{f<n>}` (e.g. `{f3}`). If a
 capturing group is not present (e.g. when matching the string `cd` with the
 regex `(ab)?cd`), the corresponding variables are not defined.

--- a/DEV.md
+++ b/DEV.md
@@ -9,25 +9,30 @@ particular [this][ppug-1] and [this][ppug-2] guide).

 ## Setting up a dev environment

-The use of [venv][venv] and [uv][uv] is recommended. To initially set up a
-development environment, run these commands in the same directory as this file:
+The use of [venv][venv] is recommended. To initially set up a development
+environment, run these commands in the same directory as this file:

 ```
-$ uv sync
+$ python -m venv .venv
 $ . .venv/bin/activate
+$ ./scripts/setup
 ```

-This install all required dependencies and tools. It also installs PFERD as
-*editable*, which means that you can just run `pferd` as if it was installed
-normally. Since PFERD was installed with `--editable`, there is no need to
-re-run `uv sync` when the source code is changed.
+The setup script installs a few required dependencies and tools. It also
+installs PFERD via `pip install --editable .`, which means that you can just run
+`pferd` as if it was installed normally. Since PFERD was installed with
+`--editable`, there is no need to re-run `pip install` when the source code is
+changed.
+
+If you get any errors because pip can't update itself, try running
+`./scripts/setup --no-pip` instead of `./scripts/setup`.

 For more details, see [this part of the Python Tutorial][venv-tut] and
 [this section on "development mode"][ppug-dev].

 [venv]: <https://docs.python.org/3/library/venv.html> "venv - Creation of virtual environments"
 [venv-tut]: <https://docs.python.org/3/tutorial/venv.html> "12. Virtual Environments and Packages"
-[uv]: <https://docs.astral.sh/uv/> "uv - An extremely fast Python package and project manager"
+[ppug-dev]: <https://packaging.python.org/guides/distributing-packages-using-setuptools/#working-in-development-mode> "Working in “development mode”"

 ## Checking and formatting the code

--- a/4
+++ b/4
@@ -1,6 +1,6 @@
-Copyright 2019-2024 Garmelon, I-Al-Istannen, danstooamerican, pavelzw,
+Copyright 2019-2021 Garmelon, I-Al-Istannen, danstooamerican, pavelzw,
                    TheChristophe, Scriptim, thelukasprobst, Toorero,
-                    Mr-Pine, p-fruck, PinieP
+                    Mr-Pine

 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in
--- a/PFERD/auth/init.py
+++ b/PFERD/auth/init.py
@@ -1,5 +1,5 @@
-from collections.abc import Callable
 from configparser import SectionProxy
+from typing import Callable, Dict

 from ..config import Config
 from .authenticator import Authenticator, AuthError, AuthLoadError, AuthSection  # noqa: F401
@@ -9,19 +9,21 @@ from .pass_ import PassAuthenticator, PassAuthSection
 from .simple import SimpleAuthenticator, SimpleAuthSection
 from .tfa import TfaAuthenticator

-AuthConstructor = Callable[
-    [
-        str,  # Name (without the "auth:" prefix)
-        SectionProxy,  # Authenticator's section of global config
-        Config,  # Global config
-    ],
-    Authenticator,
-]
+AuthConstructor = Callable[[
+    str,                # Name (without the "auth:" prefix)
+    SectionProxy,       # Authenticator's section of global config
+    Config,             # Global config
+], Authenticator]

-AUTHENTICATORS: dict[str, AuthConstructor] = {
-    "credential-file": lambda n, s, c: CredentialFileAuthenticator(n, CredentialFileAuthSection(s), c),
-    "keyring": lambda n, s, c: KeyringAuthenticator(n, KeyringAuthSection(s)),
-    "pass": lambda n, s, c: PassAuthenticator(n, PassAuthSection(s)),
-    "simple": lambda n, s, c: SimpleAuthenticator(n, SimpleAuthSection(s)),
-    "tfa": lambda n, s, c: TfaAuthenticator(n),
+AUTHENTICATORS: Dict[str, AuthConstructor] = {
+    "credential-file": lambda n, s, c:
+        CredentialFileAuthenticator(n, CredentialFileAuthSection(s), c),
+    "keyring": lambda n, s, c:
+        KeyringAuthenticator(n, KeyringAuthSection(s)),
+    "pass": lambda n, s, c:
+        PassAuthenticator(n, PassAuthSection(s)),
+    "simple": lambda n, s, c:
+        SimpleAuthenticator(n, SimpleAuthSection(s)),
+    "tfa": lambda n, s, c:
+        TfaAuthenticator(n),
 }
--- a/PFERD/auth/authenticator.py
+++ b/PFERD/auth/authenticator.py
@@ -1,4 +1,5 @@
 from abc import ABC, abstractmethod
+from typing import Tuple

 from ..config import Section

@@ -34,7 +35,7 @@ class Authenticator(ABC):
        self.name = name

    @abstractmethod
-    async def credentials(self) -> tuple[str, str]:
+    async def credentials(self) -> Tuple[str, str]:
        pass

    async def username(self) -> str:
--- a/PFERD/auth/credential_file.py
+++ b/PFERD/auth/credential_file.py
@@ -1,4 +1,5 @@
 from pathlib import Path
+from typing import Tuple

 from ..config import Config
 from ..utils import fmt_real_path
@@ -22,9 +23,7 @@ class CredentialFileAuthenticator(Authenticator):
            with open(path, encoding="utf-8") as f:
                lines = list(f)
        except UnicodeDecodeError:
-            raise AuthLoadError(
-                f"Credential file at {fmt_real_path(path)} is not encoded using UTF-8"
-            ) from None
+            raise AuthLoadError(f"Credential file at {fmt_real_path(path)} is not encoded using UTF-8")
        except OSError as e:
            raise AuthLoadError(f"No credential file at {fmt_real_path(path)}") from e

@@ -43,5 +42,5 @@ class CredentialFileAuthenticator(Authenticator):
        self._username = uline[9:]
        self._password = pline[9:]

-    async def credentials(self) -> tuple[str, str]:
+    async def credentials(self) -> Tuple[str, str]:
        return self._username, self._password
--- a/PFERD/auth/keyring.py
+++ b/PFERD/auth/keyring.py
@@ -1,4 +1,4 @@
-from typing import Optional
+from typing import Optional, Tuple

 import keyring

@@ -17,6 +17,7 @@ class KeyringAuthSection(AuthSection):


 class KeyringAuthenticator(Authenticator):
+
    def __init__(self, name: str, section: KeyringAuthSection) -> None:
        super().__init__(name)

@@ -27,7 +28,7 @@ class KeyringAuthenticator(Authenticator):
        self._password_invalidated = False
        self._username_fixed = section.username() is not None

-    async def credentials(self) -> tuple[str, str]:
+    async def credentials(self) -> Tuple[str, str]:
        # Request the username
        if self._username is None:
            async with log.exclusive_output():
--- a/PFERD/auth/pass_.py
+++ b/PFERD/auth/pass_.py
@@ -1,5 +1,6 @@
 import re
 import subprocess
+from typing import List, Tuple

 from ..logging import log
 from .authenticator import Authenticator, AuthError, AuthSection
@@ -11,11 +12,11 @@ class PassAuthSection(AuthSection):
            self.missing_value("passname")
        return value

-    def username_prefixes(self) -> list[str]:
+    def username_prefixes(self) -> List[str]:
        value = self.s.get("username_prefixes", "login,username,user")
        return [prefix.lower() for prefix in value.split(",")]

-    def password_prefixes(self) -> list[str]:
+    def password_prefixes(self) -> List[str]:
        value = self.s.get("password_prefixes", "password,pass,secret")
        return [prefix.lower() for prefix in value.split(",")]

@@ -30,14 +31,14 @@ class PassAuthenticator(Authenticator):
        self._username_prefixes = section.username_prefixes()
        self._password_prefixes = section.password_prefixes()

-    async def credentials(self) -> tuple[str, str]:
+    async def credentials(self) -> Tuple[str, str]:
        log.explain_topic("Obtaining credentials from pass")

        try:
            log.explain(f"Calling 'pass show {self._passname}'")
            result = subprocess.check_output(["pass", "show", self._passname], text=True)
        except subprocess.CalledProcessError as e:
-            raise AuthError(f"Failed to get password info from {self._passname}: {e}") from e
+            raise AuthError(f"Failed to get password info from {self._passname}: {e}")

        prefixed = {}
        unprefixed = []
--- a/PFERD/auth/simple.py
+++ b/PFERD/auth/simple.py
@@ -1,4 +1,4 @@
-from typing import Optional
+from typing import Optional, Tuple

 from ..logging import log
 from ..utils import agetpass, ainput
@@ -23,7 +23,7 @@ class SimpleAuthenticator(Authenticator):
        self._username_fixed = self.username is not None
        self._password_fixed = self.password is not None

-    async def credentials(self) -> tuple[str, str]:
+    async def credentials(self) -> Tuple[str, str]:
        if self._username is not None and self._password is not None:
            return self._username, self._password

--- a/PFERD/auth/tfa.py
+++ b/PFERD/auth/tfa.py
@@ -1,3 +1,5 @@
+from typing import Tuple
+
 from ..logging import log
 from ..utils import ainput
 from .authenticator import Authenticator, AuthError
@@ -15,7 +17,7 @@ class TfaAuthenticator(Authenticator):
            code = await ainput("TFA code: ")
            return code

-    async def credentials(self) -> tuple[str, str]:
+    async def credentials(self) -> Tuple[str, str]:
        raise AuthError("TFA authenticator does not support usernames")

    def invalidate_username(self) -> None:
--- a/PFERD/cli/init.py
+++ b/PFERD/cli/init.py
@@ -8,7 +8,6 @@
 # well.

 from . import command_local  # noqa: F401 imported but unused
-from . import command_ilias_web  # noqa: F401 imported but unused
 from . import command_kit_ilias_web  # noqa: F401 imported but unused
 from . import command_kit_ipd  # noqa: F401 imported but unused
 from .parser import PARSER, ParserLoadError, load_default_section  # noqa: F401 imported but unused
--- a/PFERD/cli/command_ilias_web.py
+++ b/PFERD/cli/command_ilias_web.py
@@ -1,53 +0,0 @@
-import argparse
-import configparser
-
-from ..logging import log
-from .common_ilias_args import configure_common_group_args, load_common
-from .parser import CRAWLER_PARSER, SUBPARSERS, load_crawler
-
-COMMAND_NAME = "ilias-web"
-
-SUBPARSER = SUBPARSERS.add_parser(
-    COMMAND_NAME,
-    parents=[CRAWLER_PARSER],
-)
-
-GROUP = SUBPARSER.add_argument_group(
-    title=f"{COMMAND_NAME} crawler arguments",
-    description=f"arguments for the '{COMMAND_NAME}' crawler",
-)
-
-GROUP.add_argument(
-    "--base-url",
-    type=str,
-    metavar="BASE_URL",
-    help="The base url of the ilias instance",
-)
-
-GROUP.add_argument(
-    "--client-id",
-    type=str,
-    metavar="CLIENT_ID",
-    help="The client id of the ilias instance",
-)
-
-configure_common_group_args(GROUP)
-
-
-def load(args: argparse.Namespace, parser: configparser.ConfigParser) -> None:
-    log.explain(f"Creating config for command '{COMMAND_NAME}'")
-
-    parser["crawl:ilias"] = {}
-    section = parser["crawl:ilias"]
-    load_crawler(args, section)
-
-    section["type"] = COMMAND_NAME
-    if args.base_url is not None:
-        section["base_url"] = args.base_url
-    if args.client_id is not None:
-        section["client_id"] = args.client_id
-
-    load_common(section, args, parser)
-
-
-SUBPARSER.set_defaults(command=load)
--- a/PFERD/cli/command_kit_ilias_web.py
+++ b/PFERD/cli/command_kit_ilias_web.py
@@ -1,37 +1,120 @@
 import argparse
 import configparser
+from pathlib import Path

+from ..crawl.ilias.file_templates import Links
 from ..logging import log
-from .common_ilias_args import configure_common_group_args, load_common
-from .parser import CRAWLER_PARSER, SUBPARSERS, load_crawler
-
-COMMAND_NAME = "kit-ilias-web"
+from .parser import (CRAWLER_PARSER, SUBPARSERS, BooleanOptionalAction, ParserLoadError, load_crawler,
+                     show_value_error)

 SUBPARSER = SUBPARSERS.add_parser(
-    COMMAND_NAME,
+    "kit-ilias-web",
    parents=[CRAWLER_PARSER],
 )

 GROUP = SUBPARSER.add_argument_group(
-    title=f"{COMMAND_NAME} crawler arguments",
-    description=f"arguments for the '{COMMAND_NAME}' crawler",
+    title="kit-ilias-web crawler arguments",
+    description="arguments for the 'kit-ilias-web' crawler",
+)
+GROUP.add_argument(
+    "target",
+    type=str,
+    metavar="TARGET",
+    help="course id, 'desktop', or ILIAS URL to crawl"
+)
+GROUP.add_argument(
+    "output",
+    type=Path,
+    metavar="OUTPUT",
+    help="output directory"
+)
+GROUP.add_argument(
+    "--username", "-u",
+    type=str,
+    metavar="USERNAME",
+    help="user name for authentication"
+)
+GROUP.add_argument(
+    "--keyring",
+    action=BooleanOptionalAction,
+    help="use the system keyring to store and retrieve passwords"
+)
+GROUP.add_argument(
+    "--credential-file",
+    type=Path,
+    metavar="PATH",
+    help="read username and password from a credential file"
+)
+GROUP.add_argument(
+    "--links",
+    type=show_value_error(Links.from_string),
+    metavar="OPTION",
+    help="how to represent external links"
+)
+GROUP.add_argument(
+    "--link-redirect-delay",
+    type=int,
+    metavar="SECONDS",
+    help="time before 'fancy' links redirect to to their target (-1 to disable)"
+)
+GROUP.add_argument(
+    "--videos",
+    action=BooleanOptionalAction,
+    help="crawl and download videos"
+)
+GROUP.add_argument(
+    "--forums",
+    action=BooleanOptionalAction,
+    help="crawl and download forum posts"
+)
+GROUP.add_argument(
+    "--http-timeout", "-t",
+    type=float,
+    metavar="SECONDS",
+    help="timeout for all HTTP requests"
 )
-
-configure_common_group_args(GROUP)


 def load(
-    args: argparse.Namespace,
-    parser: configparser.ConfigParser,
+        args: argparse.Namespace,
+        parser: configparser.ConfigParser,
 ) -> None:
-    log.explain(f"Creating config for command '{COMMAND_NAME}'")
+    log.explain("Creating config for command 'kit-ilias-web'")

    parser["crawl:ilias"] = {}
    section = parser["crawl:ilias"]
    load_crawler(args, section)

-    section["type"] = COMMAND_NAME
-    load_common(section, args, parser)
+    section["type"] = "kit-ilias-web"
+    section["target"] = str(args.target)
+    section["output_dir"] = str(args.output)
+    section["auth"] = "auth:ilias"
+    if args.links is not None:
+        section["links"] = str(args.links.value)
+    if args.link_redirect_delay is not None:
+        section["link_redirect_delay"] = str(args.link_redirect_delay)
+    if args.videos is not None:
+        section["videos"] = "yes" if args.videos else "no"
+    if args.forums is not None:
+        section["forums"] = "yes" if args.forums else "no"
+    if args.http_timeout is not None:
+        section["http_timeout"] = str(args.http_timeout)
+
+    parser["auth:ilias"] = {}
+    auth_section = parser["auth:ilias"]
+    if args.credential_file is not None:
+        if args.username is not None:
+            raise ParserLoadError("--credential-file and --username can't be used together")
+        if args.keyring:
+            raise ParserLoadError("--credential-file and --keyring can't be used together")
+        auth_section["type"] = "credential-file"
+        auth_section["path"] = str(args.credential_file)
+    elif args.keyring:
+        auth_section["type"] = "keyring"
+    else:
+        auth_section["type"] = "simple"
+    if args.username is not None:
+        auth_section["username"] = args.username


 SUBPARSER.set_defaults(command=load)
--- a/PFERD/cli/command_kit_ipd.py
+++ b/PFERD/cli/command_kit_ipd.py
@@ -18,25 +18,25 @@ GROUP.add_argument(
    "--link-regex",
    type=str,
    metavar="REGEX",
-    help="href-matching regex to identify downloadable files",
+    help="href-matching regex to identify downloadable files"
 )
 GROUP.add_argument(
    "target",
    type=str,
    metavar="TARGET",
-    help="url to crawl",
+    help="url to crawl"
 )
 GROUP.add_argument(
    "output",
    type=Path,
    metavar="OUTPUT",
-    help="output directory",
+    help="output directory"
 )


 def load(
-    args: argparse.Namespace,
-    parser: configparser.ConfigParser,
+        args: argparse.Namespace,
+        parser: configparser.ConfigParser,
 ) -> None:
    log.explain("Creating config for command 'kit-ipd'")

--- a/PFERD/cli/command_local.py
+++ b/PFERD/cli/command_local.py
@@ -18,37 +18,37 @@ GROUP.add_argument(
    "target",
    type=Path,
    metavar="TARGET",
-    help="directory to crawl",
+    help="directory to crawl"
 )
 GROUP.add_argument(
    "output",
    type=Path,
    metavar="OUTPUT",
-    help="output directory",
+    help="output directory"
 )
 GROUP.add_argument(
    "--crawl-delay",
    type=float,
    metavar="SECONDS",
-    help="artificial delay to simulate for crawl requests",
+    help="artificial delay to simulate for crawl requests"
 )
 GROUP.add_argument(
    "--download-delay",
    type=float,
    metavar="SECONDS",
-    help="artificial delay to simulate for download requests",
+    help="artificial delay to simulate for download requests"
 )
 GROUP.add_argument(
    "--download-speed",
    type=int,
    metavar="BYTES_PER_SECOND",
-    help="download speed to simulate",
+    help="download speed to simulate"
 )


 def load(
-    args: argparse.Namespace,
-    parser: configparser.ConfigParser,
+        args: argparse.Namespace,
+        parser: configparser.ConfigParser,
 ) -> None:
    log.explain("Creating config for command 'local'")

--- a/PFERD/cli/common_ilias_args.py
+++ b/PFERD/cli/common_ilias_args.py
@@ -1,106 +0,0 @@
-import argparse
-import configparser
-from pathlib import Path
-
-from ..crawl.ilias.file_templates import Links
-from .parser import BooleanOptionalAction, ParserLoadError, show_value_error
-
-
-def configure_common_group_args(group: argparse._ArgumentGroup) -> None:
-    """These arguments are shared between the KIT and generic Ilias web command."""
-    group.add_argument(
-        "target",
-        type=str,
-        metavar="TARGET",
-        help="course id, 'desktop', or ILIAS URL to crawl",
-    )
-    group.add_argument(
-        "output",
-        type=Path,
-        metavar="OUTPUT",
-        help="output directory",
-    )
-    group.add_argument(
-        "--username",
-        "-u",
-        type=str,
-        metavar="USERNAME",
-        help="user name for authentication",
-    )
-    group.add_argument(
-        "--keyring",
-        action=BooleanOptionalAction,
-        help="use the system keyring to store and retrieve passwords",
-    )
-    group.add_argument(
-        "--credential-file",
-        type=Path,
-        metavar="PATH",
-        help="read username and password from a credential file",
-    )
-    group.add_argument(
-        "--links",
-        type=show_value_error(Links.from_string),
-        metavar="OPTION",
-        help="how to represent external links",
-    )
-    group.add_argument(
-        "--link-redirect-delay",
-        type=int,
-        metavar="SECONDS",
-        help="time before 'fancy' links redirect to to their target (-1 to disable)",
-    )
-    group.add_argument(
-        "--videos",
-        action=BooleanOptionalAction,
-        help="crawl and download videos",
-    )
-    group.add_argument(
-        "--forums",
-        action=BooleanOptionalAction,
-        help="crawl and download forum posts",
-    )
-    group.add_argument(
-        "--http-timeout",
-        "-t",
-        type=float,
-        metavar="SECONDS",
-        help="timeout for all HTTP requests",
-    )
-
-
-def load_common(
-    section: configparser.SectionProxy,
-    args: argparse.Namespace,
-    parser: configparser.ConfigParser,
-) -> None:
-    """Load common config between generic and KIT ilias web command"""
-    section["target"] = str(args.target)
-    section["output_dir"] = str(args.output)
-    section["auth"] = "auth:ilias"
-    if args.links is not None:
-        section["links"] = str(args.links.value)
-    if args.link_redirect_delay is not None:
-        section["link_redirect_delay"] = str(args.link_redirect_delay)
-    if args.videos is not None:
-        section["videos"] = "yes" if args.videos else "no"
-    if args.forums is not None:
-        section["forums"] = "yes" if args.forums else "no"
-    if args.http_timeout is not None:
-        section["http_timeout"] = str(args.http_timeout)
-
-    parser["auth:ilias"] = {}
-    auth_section = parser["auth:ilias"]
-    if args.credential_file is not None:
-        if args.username is not None:
-            raise ParserLoadError("--credential-file and --username can't be used together")
-        if args.keyring:
-            raise ParserLoadError("--credential-file and --keyring can't be used together")
-        auth_section["type"] = "credential-file"
-        auth_section["path"] = str(args.credential_file)
-    elif args.keyring:
-        auth_section["type"] = "keyring"
-    else:
-        auth_section["type"] = "simple"
-    if args.username is not None:
-        auth_section["username"] = args.username
--- a/PFERD/cli/parser.py
+++ b/PFERD/cli/parser.py
@@ -1,9 +1,8 @@
 import argparse
 import configparser
 from argparse import ArgumentTypeError
-from collections.abc import Callable, Sequence
 from pathlib import Path
-from typing import Any, Optional
+from typing import Any, Callable, List, Optional, Sequence, Union

 from ..output_dir import OnConflict, Redownload
 from ..version import NAME, VERSION
@@ -16,15 +15,15 @@ class ParserLoadError(Exception):
 # TODO Replace with argparse version when updating to 3.9?
 class BooleanOptionalAction(argparse.Action):
    def __init__(
-        self,
-        option_strings: list[str],
-        dest: Any,
-        default: Any = None,
-        type: Any = None,
-        choices: Any = None,
-        required: Any = False,
-        help: Any = None,
-        metavar: Any = None,
+            self,
+            option_strings: List[str],
+            dest: Any,
+            default: Any = None,
+            type: Any = None,
+            choices: Any = None,
+            required: Any = False,
+            help: Any = None,
+            metavar: Any = None,
    ):
        if len(option_strings) != 1:
            raise ValueError("There must be exactly one option string")
@@ -49,11 +48,11 @@ class BooleanOptionalAction(argparse.Action):
        )

    def __call__(
-        self,
-        parser: argparse.ArgumentParser,
-        namespace: argparse.Namespace,
-        values: str | Sequence[Any] | None,
-        option_string: Optional[str] = None,
+            self,
+            parser: argparse.ArgumentParser,
+            namespace: argparse.Namespace,
+            values: Union[str, Sequence[Any], None],
+            option_string: Optional[str] = None,
    ) -> None:
        if option_string and option_string in self.option_strings:
            value = not option_string.startswith("--no-")
@@ -68,13 +67,11 @@ def show_value_error(inner: Callable[[str], Any]) -> Callable[[str], Any]:
    Some validation functions (like the from_string in our enums) raise a ValueError.
    Argparse only pretty-prints ArgumentTypeErrors though, so we need to wrap our ValueErrors.
    """
-
    def wrapper(input: str) -> Any:
        try:
            return inner(input)
        except ValueError as e:
-            raise ArgumentTypeError(e) from e
-
+            raise ArgumentTypeError(e)
    return wrapper


@@ -84,57 +81,52 @@ CRAWLER_PARSER_GROUP = CRAWLER_PARSER.add_argument_group(
    description="arguments common to all crawlers",
 )
 CRAWLER_PARSER_GROUP.add_argument(
-    "--redownload",
-    "-r",
+    "--redownload", "-r",
    type=show_value_error(Redownload.from_string),
    metavar="OPTION",
-    help="when to download a file that's already present locally",
+    help="when to download a file that's already present locally"
 )
 CRAWLER_PARSER_GROUP.add_argument(
    "--on-conflict",
    type=show_value_error(OnConflict.from_string),
    metavar="OPTION",
-    help="what to do when local and remote files or directories differ",
+    help="what to do when local and remote files or directories differ"
 )
 CRAWLER_PARSER_GROUP.add_argument(
-    "--transform",
-    "-T",
+    "--transform", "-T",
    action="append",
    type=str,
    metavar="RULE",
-    help="add a single transformation rule. Can be specified multiple times",
+    help="add a single transformation rule. Can be specified multiple times"
 )
 CRAWLER_PARSER_GROUP.add_argument(
-    "--tasks",
-    "-n",
+    "--tasks", "-n",
    type=int,
    metavar="N",
-    help="maximum number of concurrent tasks (crawling, downloading)",
+    help="maximum number of concurrent tasks (crawling, downloading)"
 )
 CRAWLER_PARSER_GROUP.add_argument(
-    "--downloads",
-    "-N",
+    "--downloads", "-N",
    type=int,
    metavar="N",
-    help="maximum number of tasks that may download data at the same time",
+    help="maximum number of tasks that may download data at the same time"
 )
 CRAWLER_PARSER_GROUP.add_argument(
-    "--task-delay",
-    "-d",
+    "--task-delay", "-d",
    type=float,
    metavar="SECONDS",
-    help="time the crawler should wait between subsequent tasks",
+    help="time the crawler should wait between subsequent tasks"
 )
 CRAWLER_PARSER_GROUP.add_argument(
    "--windows-paths",
    action=BooleanOptionalAction,
-    help="whether to repair invalid paths on windows",
+    help="whether to repair invalid paths on windows"
 )


 def load_crawler(
-    args: argparse.Namespace,
-    section: configparser.SectionProxy,
+        args: argparse.Namespace,
+        section: configparser.SectionProxy,
 ) -> None:
    if args.redownload is not None:
        section["redownload"] = args.redownload.value
@@ -160,79 +152,79 @@ PARSER.add_argument(
    version=f"{NAME} {VERSION} (https://github.com/Garmelon/PFERD)",
 )
 PARSER.add_argument(
-    "--config",
-    "-c",
+    "--config", "-c",
    type=Path,
    metavar="PATH",
-    help="custom config file",
+    help="custom config file"
 )
 PARSER.add_argument(
    "--dump-config",
    action="store_true",
-    help="dump current configuration to the default config path and exit",
+    help="dump current configuration to the default config path and exit"
 )
 PARSER.add_argument(
    "--dump-config-to",
    metavar="PATH",
-    help="dump current configuration to a file and exit. Use '-' as path to print to stdout instead",
+    help="dump current configuration to a file and exit."
+    " Use '-' as path to print to stdout instead"
 )
 PARSER.add_argument(
    "--debug-transforms",
    action="store_true",
-    help="apply transform rules to files of previous run",
+    help="apply transform rules to files of previous run"
 )
 PARSER.add_argument(
-    "--crawler",
-    "-C",
+    "--crawler", "-C",
    action="append",
    type=str,
    metavar="NAME",
-    help="only execute a single crawler. Can be specified multiple times to execute multiple crawlers",
+    help="only execute a single crawler."
+    " Can be specified multiple times to execute multiple crawlers"
 )
 PARSER.add_argument(
-    "--skip",
-    "-S",
+    "--skip", "-S",
    action="append",
    type=str,
    metavar="NAME",
-    help="don't execute this particular crawler. Can be specified multiple times to skip multiple crawlers",
+    help="don't execute this particular crawler."
+    " Can be specified multiple times to skip multiple crawlers"
 )
 PARSER.add_argument(
    "--working-dir",
    type=Path,
    metavar="PATH",
-    help="custom working directory",
+    help="custom working directory"
 )
 PARSER.add_argument(
    "--explain",
    action=BooleanOptionalAction,
-    help="log and explain in detail what PFERD is doing",
+    help="log and explain in detail what PFERD is doing"
 )
 PARSER.add_argument(
    "--status",
    action=BooleanOptionalAction,
-    help="print status updates while PFERD is crawling",
+    help="print status updates while PFERD is crawling"
 )
 PARSER.add_argument(
    "--report",
    action=BooleanOptionalAction,
-    help="print a report of all local changes before exiting",
+    help="print a report of all local changes before exiting"
 )
 PARSER.add_argument(
    "--share-cookies",
    action=BooleanOptionalAction,
-    help="whether crawlers should share cookies where applicable",
+    help="whether crawlers should share cookies where applicable"
 )
 PARSER.add_argument(
    "--show-not-deleted",
    action=BooleanOptionalAction,
-    help="print messages in status and report when PFERD did not delete a local only file",
+    help="print messages in status and report when PFERD did not delete a local only file"
 )


 def load_default_section(
-    args: argparse.Namespace,
-    parser: configparser.ConfigParser,
+        args: argparse.Namespace,
+        parser: configparser.ConfigParser,
 ) -> None:
    section = parser[parser.default_section]

--- a/PFERD/config.py
+++ b/PFERD/config.py
@@ -3,7 +3,7 @@ import os
 import sys
 from configparser import ConfigParser, SectionProxy
 from pathlib import Path
-from typing import Any, NoReturn, Optional
+from typing import Any, List, NoReturn, Optional, Tuple

 from rich.markup import escape

@@ -53,10 +53,10 @@ class Section:
        raise ConfigOptionError(self.s.name, key, desc)

    def invalid_value(
-        self,
-        key: str,
-        value: Any,
-        reason: Optional[str],
+            self,
+            key: str,
+            value: Any,
+            reason: Optional[str],
    ) -> NoReturn:
        if reason is None:
            self.error(key, f"Invalid value {value!r}")
@@ -126,13 +126,13 @@ class Config:
            with open(path, encoding="utf-8") as f:
                parser.read_file(f, source=str(path))
        except FileNotFoundError:
-            raise ConfigLoadError(path, "File does not exist") from None
+            raise ConfigLoadError(path, "File does not exist")
        except IsADirectoryError:
-            raise ConfigLoadError(path, "That's a directory, not a file") from None
+            raise ConfigLoadError(path, "That's a directory, not a file")
        except PermissionError:
-            raise ConfigLoadError(path, "Insufficient permissions") from None
+            raise ConfigLoadError(path, "Insufficient permissions")
        except UnicodeDecodeError:
-            raise ConfigLoadError(path, "File is not encoded using UTF-8") from None
+            raise ConfigLoadError(path, "File is not encoded using UTF-8")

    def dump(self, path: Optional[Path] = None) -> None:
        """
@@ -150,8 +150,8 @@ class Config:

        try:
            path.parent.mkdir(parents=True, exist_ok=True)
-        except PermissionError as e:
-            raise ConfigDumpError(path, "Could not create parent directory") from e
+        except PermissionError:
+            raise ConfigDumpError(path, "Could not create parent directory")

        try:
            # Ensuring we don't accidentally overwrite any existing files by
@@ -167,16 +167,16 @@ class Config:
                    with open(path, "w", encoding="utf-8") as f:
                        self._parser.write(f)
                else:
-                    raise ConfigDumpError(path, "File already exists") from None
+                    raise ConfigDumpError(path, "File already exists")
        except IsADirectoryError:
-            raise ConfigDumpError(path, "That's a directory, not a file") from None
-        except PermissionError as e:
-            raise ConfigDumpError(path, "Insufficient permissions") from e
+            raise ConfigDumpError(path, "That's a directory, not a file")
+        except PermissionError:
+            raise ConfigDumpError(path, "Insufficient permissions")

    def dump_to_stdout(self) -> None:
        self._parser.write(sys.stdout)

-    def crawl_sections(self) -> list[tuple[str, SectionProxy]]:
+    def crawl_sections(self) -> List[Tuple[str, SectionProxy]]:
        result = []
        for name, proxy in self._parser.items():
            if name.startswith("crawl:"):
@@ -184,7 +184,7 @@ class Config:

        return result

-    def auth_sections(self) -> list[tuple[str, SectionProxy]]:
+    def auth_sections(self) -> List[Tuple[str, SectionProxy]]:
        result = []
        for name, proxy in self._parser.items():
            if name.startswith("auth:"):
--- a/PFERD/crawl/init.py
+++ b/PFERD/crawl/init.py
@@ -1,26 +1,25 @@
-from collections.abc import Callable
 from configparser import SectionProxy
+from typing import Callable, Dict

 from ..auth import Authenticator
 from ..config import Config
 from .crawler import Crawler, CrawlError, CrawlerSection  # noqa: F401
-from .ilias import IliasWebCrawler, IliasWebCrawlerSection, KitIliasWebCrawler, KitIliasWebCrawlerSection
+from .ilias import KitIliasWebCrawler, KitIliasWebCrawlerSection
 from .kit_ipd_crawler import KitIpdCrawler, KitIpdCrawlerSection
 from .local_crawler import LocalCrawler, LocalCrawlerSection

-CrawlerConstructor = Callable[
-    [
-        str,  # Name (without the "crawl:" prefix)
-        SectionProxy,  # Crawler's section of global config
-        Config,  # Global config
-        dict[str, Authenticator],  # Loaded authenticators by name
-    ],
-    Crawler,
-]
+CrawlerConstructor = Callable[[
+    str,                       # Name (without the "crawl:" prefix)
+    SectionProxy,              # Crawler's section of global config
+    Config,                    # Global config
+    Dict[str, Authenticator],  # Loaded authenticators by name
+], Crawler]

-CRAWLERS: dict[str, CrawlerConstructor] = {
-    "local": lambda n, s, c, a: LocalCrawler(n, LocalCrawlerSection(s), c),
-    "ilias-web": lambda n, s, c, a: IliasWebCrawler(n, IliasWebCrawlerSection(s), c, a),
-    "kit-ilias-web": lambda n, s, c, a: KitIliasWebCrawler(n, KitIliasWebCrawlerSection(s), c, a),
-    "kit-ipd": lambda n, s, c, a: KitIpdCrawler(n, KitIpdCrawlerSection(s), c),
+CRAWLERS: Dict[str, CrawlerConstructor] = {
+    "local": lambda n, s, c, a:
+        LocalCrawler(n, LocalCrawlerSection(s), c),
+    "kit-ilias-web": lambda n, s, c, a:
+        KitIliasWebCrawler(n, KitIliasWebCrawlerSection(s), c, a),
+    "kit-ipd": lambda n, s, c, a:
+        KitIpdCrawler(n, KitIpdCrawlerSection(s), c),
 }
--- a/PFERD/crawl/crawler.py
+++ b/PFERD/crawl/crawler.py
@@ -1,10 +1,10 @@
 import asyncio
 import os
 from abc import ABC, abstractmethod
-from collections.abc import Awaitable, Callable, Coroutine, Sequence
+from collections.abc import Awaitable, Coroutine
 from datetime import datetime
 from pathlib import Path, PurePath
-from typing import Any, Optional, TypeVar
+from typing import Any, Callable, Dict, List, Optional, Sequence, Set, Tuple, TypeVar

 from ..auth import Authenticator
 from ..config import Config, Section
@@ -116,7 +116,7 @@ class CrawlToken(ReusableAsyncContextManager[ProgressBar]):
        return bar


-class DownloadToken(ReusableAsyncContextManager[tuple[ProgressBar, FileSink]]):
+class DownloadToken(ReusableAsyncContextManager[Tuple[ProgressBar, FileSink]]):
    def __init__(self, limiter: Limiter, fs_token: FileSinkToken, path: PurePath):
        super().__init__()

@@ -128,13 +128,12 @@ class DownloadToken(ReusableAsyncContextManager[tuple[ProgressBar, FileSink]]):
    def path(self) -> PurePath:
        return self._path

-    async def _on_aenter(self) -> tuple[ProgressBar, FileSink]:
+    async def _on_aenter(self) -> Tuple[ProgressBar, FileSink]:
        await self._stack.enter_async_context(self._limiter.limit_download())
        sink = await self._stack.enter_async_context(self._fs_token)
        # The "Downloaded ..." message is printed in the output dir, not here
-        bar = self._stack.enter_context(
-            log.download_bar("[bold bright_cyan]", "Downloading", fmt_path(self._path))
-        )
+        bar = self._stack.enter_context(log.download_bar("[bold bright_cyan]", "Downloading",
+                                                         fmt_path(self._path)))

        return bar, sink

@@ -150,7 +149,9 @@ class CrawlerSection(Section):
        return self.s.getboolean("skip", fallback=False)

    def output_dir(self, name: str) -> Path:
-        name = name.removeprefix("crawl:")
+        # TODO Use removeprefix() after switching to 3.9
+        if name.startswith("crawl:"):
+            name = name[len("crawl:"):]
        return Path(self.s.get("output_dir", name)).expanduser()

    def redownload(self) -> Redownload:
@@ -205,7 +206,7 @@ class CrawlerSection(Section):
        on_windows = os.name == "nt"
        return self.s.getboolean("windows_paths", fallback=on_windows)

-    def auth(self, authenticators: dict[str, Authenticator]) -> Authenticator:
+    def auth(self, authenticators: Dict[str, Authenticator]) -> Authenticator:
        value = self.s.get("auth")
        if value is None:
            self.missing_value("auth")
@@ -217,10 +218,10 @@ class CrawlerSection(Section):

 class Crawler(ABC):
    def __init__(
-        self,
-        name: str,
-        section: CrawlerSection,
-        config: Config,
+            self,
+            name: str,
+            section: CrawlerSection,
+            config: Config,
    ) -> None:
        """
        Initialize a crawler from its name and its section in the config file.
@@ -257,12 +258,8 @@ class Crawler(ABC):
    def prev_report(self) -> Optional[Report]:
        return self._output_dir.prev_report

-    @property
-    def output_dir(self) -> OutputDirectory:
-        return self._output_dir
-
    @staticmethod
-    async def gather(awaitables: Sequence[Awaitable[Any]]) -> list[Any]:
+    async def gather(awaitables: Sequence[Awaitable[Any]]) -> List[Any]:
        """
        Similar to asyncio.gather. However, in the case of an exception, all
        still running tasks are cancelled and the exception is rethrown.
@@ -293,39 +290,12 @@ class Crawler(ABC):
        log.explain("Answer: Yes")
        return CrawlToken(self._limiter, path)

-    def should_try_download(
-        self,
-        path: PurePath,
-        *,
-        etag_differs: Optional[bool] = None,
-        mtime: Optional[datetime] = None,
-        redownload: Optional[Redownload] = None,
-        on_conflict: Optional[OnConflict] = None,
-    ) -> bool:
-        log.explain_topic(f"Decision: Should Download {fmt_path(path)}")
-
-        if self._transformer.transform(path) is None:
-            log.explain("Answer: No (ignored)")
-            return False
-
-        should_download = self._output_dir.should_try_download(
-            path, etag_differs=etag_differs, mtime=mtime, redownload=redownload, on_conflict=on_conflict
-        )
-        if should_download:
-            log.explain("Answer: Yes")
-            return True
-        else:
-            log.explain("Answer: No")
-            return False
-
    async def download(
-        self,
-        path: PurePath,
-        *,
-        etag_differs: Optional[bool] = None,
-        mtime: Optional[datetime] = None,
-        redownload: Optional[Redownload] = None,
-        on_conflict: Optional[OnConflict] = None,
+            self,
+            path: PurePath,
+            mtime: Optional[datetime] = None,
+            redownload: Optional[Redownload] = None,
+            on_conflict: Optional[OnConflict] = None,
    ) -> Optional[DownloadToken]:
        log.explain_topic(f"Decision: Download {fmt_path(path)}")
        path = self._deduplicator.mark(path)
@@ -337,14 +307,7 @@ class Crawler(ABC):
            log.status("[bold bright_black]", "Ignored", fmt_path(path))
            return None

-        fs_token = await self._output_dir.download(
-            path,
-            transformed_path,
-            etag_differs=etag_differs,
-            mtime=mtime,
-            redownload=redownload,
-            on_conflict=on_conflict,
-        )
+        fs_token = await self._output_dir.download(path, transformed_path, mtime, redownload, on_conflict)
        if fs_token is None:
            log.explain("Answer: No")
            return None
@@ -394,7 +357,7 @@ class Crawler(ABC):
            log.warn("Couldn't find or load old report")
            return

-        seen: set[PurePath] = set()
+        seen: Set[PurePath] = set()
        for known in sorted(self.prev_report.found_paths):
            looking_at = list(reversed(known.parents)) + [known]
            for path in looking_at:
--- a/PFERD/crawl/http_crawler.py
+++ b/PFERD/crawl/http_crawler.py
@@ -1,14 +1,12 @@
 import asyncio
 import http.cookies
 import ssl
-from datetime import datetime
 from pathlib import Path, PurePath
-from typing import Any, Optional
+from typing import Any, Dict, List, Optional

 import aiohttp
 import certifi
 from aiohttp.client import ClientTimeout
-from bs4 import Tag

 from ..auth import Authenticator
 from ..config import Config
@@ -17,23 +15,21 @@ from ..utils import fmt_real_path
 from ..version import NAME, VERSION
 from .crawler import Crawler, CrawlerSection

-ETAGS_CUSTOM_REPORT_VALUE_KEY = "etags"
-

 class HttpCrawlerSection(CrawlerSection):
    def http_timeout(self) -> float:
-        return self.s.getfloat("http_timeout", fallback=30)
+        return self.s.getfloat("http_timeout", fallback=20)


 class HttpCrawler(Crawler):
    COOKIE_FILE = PurePath(".cookies")

    def __init__(
-        self,
-        name: str,
-        section: HttpCrawlerSection,
-        config: Config,
-        shared_auth: Optional[Authenticator] = None,
+            self,
+            name: str,
+            section: HttpCrawlerSection,
+            config: Config,
+            shared_auth: Optional[Authenticator] = None,
    ) -> None:
        super().__init__(name, section, config)

@@ -43,7 +39,7 @@ class HttpCrawler(Crawler):
        self._http_timeout = section.http_timeout()

        self._cookie_jar_path = self._output_dir.resolve(self.COOKIE_FILE)
-        self._shared_cookie_jar_paths: Optional[list[Path]] = None
+        self._shared_cookie_jar_paths: Optional[List[Path]] = None
        self._shared_auth = shared_auth

        self._output_dir.register_reserved(self.COOKIE_FILE)
@@ -98,7 +94,7 @@ class HttpCrawler(Crawler):
        """
        raise RuntimeError("_authenticate() was called but crawler doesn't provide an implementation")

-    def share_cookies(self, shared: dict[Authenticator, list[Path]]) -> None:
+    def share_cookies(self, shared: Dict[Authenticator, List[Path]]) -> None:
        if not self._shared_auth:
            return

@@ -173,102 +169,24 @@ class HttpCrawler(Crawler):
            log.warn(f"Failed to save cookies to {fmt_real_path(self._cookie_jar_path)}")
            log.warn(str(e))

-    @staticmethod
-    def get_folder_structure_from_heading_hierarchy(file_link: Tag, drop_h1: bool = False) -> PurePath:
-        """
-        Retrieves the hierarchy of headings associated with the give file link and constructs a folder
-        structure from them.
-
-        <h1> level headings usually only appear once and serve as the page title, so they would introduce
-        redundant nesting. To avoid this, <h1> headings are ignored via the drop_h1 parameter.
-        """
-
-        def find_associated_headings(tag: Tag, level: int) -> PurePath:
-            if level == 0 or (level == 1 and drop_h1):
-                return PurePath()
-
-            level_heading = tag.find_previous(name=f"h{level}")
-
-            if level_heading is None:
-                return find_associated_headings(tag, level - 1)
-
-            folder_name = level_heading.get_text().strip()
-            return find_associated_headings(level_heading, level - 1) / folder_name
-
-        # start at level <h3> because paragraph-level headings are usually too granular for folder names
-        return find_associated_headings(file_link, 3)
-
-    def _get_previous_etag_from_report(self, path: PurePath) -> Optional[str]:
-        """
-        If available, retrieves the entity tag for a given path which was stored in the previous report.
-        """
-        if not self._output_dir.prev_report:
-            return None
-
-        etags = self._output_dir.prev_report.get_custom_value(ETAGS_CUSTOM_REPORT_VALUE_KEY) or {}
-        return etags.get(str(path))
-
-    def _add_etag_to_report(self, path: PurePath, etag: Optional[str]) -> None:
-        """
-        Adds an entity tag for a given path to the report's custom values.
-        """
-        if not etag:
-            return
-
-        etags = self._output_dir.report.get_custom_value(ETAGS_CUSTOM_REPORT_VALUE_KEY) or {}
-        etags[str(path)] = etag
-        self._output_dir.report.add_custom_value(ETAGS_CUSTOM_REPORT_VALUE_KEY, etags)
-
-    async def _request_resource_version(self, resource_url: str) -> tuple[Optional[str], Optional[datetime]]:
-        """
-        Requests the ETag and Last-Modified headers of a resource via a HEAD request.
-        If no entity tag / modification date can be obtained, the according value will be None.
-        """
-        try:
-            async with self.session.head(resource_url) as resp:
-                if resp.status != 200:
-                    return None, None
-
-                etag_header = resp.headers.get("ETag")
-                last_modified_header = resp.headers.get("Last-Modified")
-                last_modified = None
-
-                if last_modified_header:
-                    try:
-                        # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Last-Modified#directives
-                        datetime_format = "%a, %d %b %Y %H:%M:%S GMT"
-                        last_modified = datetime.strptime(last_modified_header, datetime_format)
-                    except ValueError:
-                        # last_modified remains None
-                        pass
-
-                return etag_header, last_modified
-        except aiohttp.ClientError:
-            return None, None
-
    async def run(self) -> None:
        self._request_count = 0
        self._cookie_jar = aiohttp.CookieJar()
        self._load_cookies()

        async with aiohttp.ClientSession(
-            headers={"User-Agent": f"{NAME}/{VERSION}"},
-            cookie_jar=self._cookie_jar,
-            connector=aiohttp.TCPConnector(ssl=ssl.create_default_context(cafile=certifi.where())),
-            timeout=ClientTimeout(
-                # 30 minutes. No download in the history of downloads was longer than 30 minutes.
-                # This is enough to transfer a 600 MB file over a 3 Mib/s connection.
-                # Allowing an arbitrary value could be annoying for overnight batch jobs
-                total=15 * 60,
-                connect=self._http_timeout,
-                sock_connect=self._http_timeout,
-                sock_read=self._http_timeout,
-            ),
-            # See https://github.com/aio-libs/aiohttp/issues/6626
-            # Without this aiohttp will mangle the redirect header from Shibboleth, invalidating the
-            # passed signature. Shibboleth will not accept the broken signature and authentication will
-            # fail.
-            requote_redirect_url=False,
+                headers={"User-Agent": f"{NAME}/{VERSION}"},
+                cookie_jar=self._cookie_jar,
+                connector=aiohttp.TCPConnector(ssl=ssl.create_default_context(cafile=certifi.where())),
+                timeout=ClientTimeout(
+                    # 30 minutes. No download in the history of downloads was longer than 30 minutes.
+                    # This is enough to transfer a 600 MB file over a 3 Mib/s connection.
+                    # Allowing an arbitrary value could be annoying for overnight batch jobs
+                    total=15 * 60,
+                    connect=self._http_timeout,
+                    sock_connect=self._http_timeout,
+                    sock_read=self._http_timeout,
+                )
        ) as session:
            self.session = session
            try:
--- a/PFERD/crawl/ilias/init.py
+++ b/PFERD/crawl/ilias/init.py
@@ -1,13 +1,3 @@
-from .kit_ilias_web_crawler import (
-    IliasWebCrawler,
-    IliasWebCrawlerSection,
-    KitIliasWebCrawler,
-    KitIliasWebCrawlerSection,
-)
+from .kit_ilias_web_crawler import KitIliasWebCrawler, KitIliasWebCrawlerSection

-__all__ = [
-    "IliasWebCrawler",
-    "IliasWebCrawlerSection",
-    "KitIliasWebCrawler",
-    "KitIliasWebCrawlerSection",
-]
+__all__ = ["KitIliasWebCrawler", "KitIliasWebCrawlerSection"]
--- a/PFERD/crawl/ilias/async_helper.py
+++ b/PFERD/crawl/ilias/async_helper.py
@@ -1,41 +0,0 @@
-import asyncio
-from collections.abc import Callable
-from typing import Any, Optional
-
-import aiohttp
-
-from ...logging import log
-from ..crawler import AWrapped, CrawlError, CrawlWarning
-
-
-def _iorepeat(attempts: int, name: str, failure_is_error: bool = False) -> Callable[[AWrapped], AWrapped]:
-    def decorator(f: AWrapped) -> AWrapped:
-        async def wrapper(*args: Any, **kwargs: Any) -> Optional[Any]:
-            last_exception: Optional[BaseException] = None
-            for round in range(attempts):
-                try:
-                    return await f(*args, **kwargs)
-                except aiohttp.ContentTypeError:  # invalid content type
-                    raise CrawlWarning("ILIAS returned an invalid content type") from None
-                except aiohttp.TooManyRedirects:
-                    raise CrawlWarning("Got stuck in a redirect loop") from None
-                except aiohttp.ClientPayloadError as e:  # encoding or not enough bytes
-                    last_exception = e
-                except aiohttp.ClientConnectionError as e:  # e.g. timeout, disconnect, resolve failed, etc.
-                    last_exception = e
-                except asyncio.exceptions.TimeoutError as e:  # explicit http timeouts in HttpCrawler
-                    last_exception = e
-                log.explain_topic(f"Retrying operation {name}. Retries left: {attempts - 1 - round}")
-                log.explain(f"Last exception: {last_exception!r}")
-
-            if last_exception:
-                message = f"Error in I/O Operation: {last_exception!r}"
-                if failure_is_error:
-                    raise CrawlError(message) from last_exception
-                else:
-                    raise CrawlWarning(message) from last_exception
-            raise CrawlError("Impossible return in ilias _iorepeat")
-
-        return wrapper  # type: ignore
-
-    return decorator
--- a/PFERD/crawl/ilias/file_templates.py
+++ b/PFERD/crawl/ilias/file_templates.py
@@ -1,7 +1,5 @@
-import dataclasses
-import re
 from enum import Enum
-from typing import Optional, cast
+from typing import Optional

 import bs4

@@ -14,9 +12,7 @@ _link_template_fancy = """
    <head>
        <meta charset="UTF-8">
        <title>ILIAS - Link: {{name}}</title>
-        <!-- REPEAT REMOVE START -->
        <meta http-equiv = "refresh" content = "{{redirect_delay}}; url = {{link}}" />
-        <!-- REPEAT REMOVE END -->
    </head>

    <style>
@@ -27,8 +23,6 @@ _link_template_fancy = """
        display: flex;
        align-items: center;
        justify-content: center;
-        flex-direction: column;
-        gap: 4px;
    }
    body {
        padding: 0;
@@ -37,15 +31,10 @@ _link_template_fancy = """
        font-family: "Open Sans", Verdana, Arial, Helvetica, sans-serif;
        height: 100vh;
    }
-    .column {
-        min-width: 500px;
-        max-width: 90vw;
-        display: flex;
-        flex-direction: column;
-        row-gap: 5px;
-    }
    .row {
        background-color: white;
+        min-width: 500px;
+        max-width: 90vw;
        display: flex;
        padding: 1em;
    }
@@ -86,23 +75,19 @@ _link_template_fancy = """
    }
    </style>
    <body class="center-flex">
-        <div class="column">
-        <!-- REPEAT START -->
-            <div class="row">
-                <div class="logo center-flex">
-                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24">
-                        <path d="M12 0c-6.627 0-12 5.373-12 12s5.373 12 12 12 12-5.373 12-12-5.373-12-12-12zm9.567 9.098c-.059-.058-.127-.108-.206-.138-.258-.101-1.35.603-1.515.256-.108-.231-.327.148-.578.008-.121-.067-.459-.52-.611-.465-.312.112.479.974.694 1.087.203-.154.86-.469 1.002-.039.271.812-.745 1.702-1.264 2.171-.775.702-.63-.454-1.159-.86-.277-.213-.274-.667-.555-.824-.125-.071-.7-.732-.694-.821l-.017.167c-.095.072-.297-.27-.319-.325 0 .298.485.772.646 1.011.273.409.42 1.005.756 1.339.179.18.866.923 1.045.908l.921-.437c.649.154-1.531 3.237-1.738 3.619-.171.321.139 1.112.114 1.49-.029.437-.374.579-.7.817-.35.255-.268.752-.562.934-.521.321-.897 1.366-1.639 1.361-.219-.001-1.151.364-1.273.007-.095-.258-.223-.455-.356-.71-.131-.25-.015-.51-.175-.731-.11-.154-.479-.502-.513-.684-.002-.157.118-.632.283-.715.231-.118.044-.462.016-.663-.048-.357-.27-.652-.535-.859-.393-.302-.189-.542-.098-.974 0-.206-.126-.476-.402-.396-.57.166-.396-.445-.812-.417-.299.021-.543.211-.821.295-.349.104-.707-.083-1.053-.126-1.421-.179-1.885-1.804-1.514-2.976.037-.192-.115-.547-.048-.696.159-.352.485-.752.768-1.021.16-.152.365-.113.553-.231.29-.182.294-.558.578-.789.404-.328.956-.321 1.482-.392.281-.037 1.35-.268 1.518-.06 0 .039.193.611-.019.578.438.023 1.061.756 1.476.585.213-.089.135-.744.573-.427.265.19 1.45.275 1.696.07.152-.125.236-.939.053-1.031.117.116-.618.125-.686.099-.122-.044-.235.115-.43.025.117.055-.651-.358-.22-.674-.181.132-.349-.037-.544.109-.135.109.062.181-.13.277-.305.155-.535-.53-.649-.607-.118-.077-1.024-.713-.777-.298l.797.793c-.04.026-.209-.289-.209-.059.053-.136.02.585-.105.35-.056-.09.091-.14.006-.271 0-.085-.23-.169-.275-.228-.126-.157-.462-.502-.644-.585-.05-.024-.771.088-.832.111-.071.099-.131.203-.181.314-.149.055-.29.127-.423.216l-.159.356c-.068.061-.772.294-.776.303.03-.076-.492-.172-.457-.324.038-.167.215-.687.169-.877-.048-.199 1.085.287 1.158-.238.029-.227.047-.492-.316-.531.069.008.702-.249.807-.364.148-.169.486-.447.731-.447.286 0 .225-.417.356-.622.133.053-.071.38.088.512-.01-.104.45.057.494.033.105-.056.691-.023.601-.299-.101-.28.052-.197.183-.255-.02.008.248-.458.363-.456-.104-.089-.398.112-.516.103-.308-.024-.177-.525-.061-.672.09-.116-.246-.258-.25-.036-.006.332-.314.633-.243 1.075.109.666-.743-.161-.816-.115-.283.172-.515-.216-.368-.449.149-.238.51-.226.659-.48.104-.179.227-.389.388-.524.541-.454.689-.091 1.229-.042.526.048.178.125.105.327-.07.192.289.261.413.1.071-.092.232-.326.301-.499.07-.175.578-.2.527-.365 2.72 1.148 4.827 3.465 5.694 6.318zm-11.113-3.779l.068-.087.073-.019c.042-.034.086-.118.151-.104.043.009.146.095.111.148-.037.054-.066-.049-.081.101-.018.169-.188.167-.313.222-.087.037-.175-.018-.09-.104l.088-.108-.007-.049zm.442.245c.046-.045.138-.008.151-.094.014-.084.078-.178-.008-.335-.022-.042.116-.082.051-.137l-.109.032s.155-.668.364-.366l-.089.103c.135.134.172.47.215.687.127.066.324.078.098.192.117-.02-.618.314-.715.178-.072-.083.317-.139.307-.173-.004-.011-.317-.02-.265-.087zm1.43-3.547l-.356.326c-.36.298-1.28.883-1.793.705-.524-.18-1.647.667-1.826.673-.067.003.002-.641.36-.689-.141.021.993-.575 1.185-.805.678-.146 1.381-.227 2.104-.227l.326.017zm-5.086 1.19c.07.082.278.092-.026.288-.183.11-.377.809-.548.809-.51.223-.542-.439-1.109.413-.078.115-.395.158-.644.236.685-.688 1.468-1.279 2.327-1.746zm-5.24 8.793c0-.541.055-1.068.139-1.586l.292.185c.113.135.113.719.169.911.139.482.484.751.748 1.19.155.261.414.923.332 1.197.109-.179 1.081.824 1.259 1.033.418.492.74 1.088.061 1.574-.219.158.334 1.14.049 1.382l-.365.094c-.225.138-.235.397-.166.631-1.562-1.765-2.518-4.076-2.518-6.611zm14.347-5.823c.083-.01-.107.167-.107.167.033.256.222.396.581.527.437.157.038.455-.213.385-.139-.039-.854-.255-.879.025 0 .167-.679.001-.573-.175.073-.119.05-.387.186-.562.193-.255.38-.116.386.032-.001.394.398-.373.619-.399z"/>
-                    </svg>
-                </div>
-                <div class="tile">
-                    <div class="top-row">
-                        <a href="{{link}}">{{name}}</a>
-                    </div>
-                    <div class="bottom-row">{{description}}</div>
-                </div>
-                <div class="menu-button center-flex"> ⯆ </div>
+        <div class="row">
+            <div class="logo center-flex">
+                <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24">
+                    <path d="M12 0c-6.627 0-12 5.373-12 12s5.373 12 12 12 12-5.373 12-12-5.373-12-12-12zm9.567 9.098c-.059-.058-.127-.108-.206-.138-.258-.101-1.35.603-1.515.256-.108-.231-.327.148-.578.008-.121-.067-.459-.52-.611-.465-.312.112.479.974.694 1.087.203-.154.86-.469 1.002-.039.271.812-.745 1.702-1.264 2.171-.775.702-.63-.454-1.159-.86-.277-.213-.274-.667-.555-.824-.125-.071-.7-.732-.694-.821l-.017.167c-.095.072-.297-.27-.319-.325 0 .298.485.772.646 1.011.273.409.42 1.005.756 1.339.179.18.866.923 1.045.908l.921-.437c.649.154-1.531 3.237-1.738 3.619-.171.321.139 1.112.114 1.49-.029.437-.374.579-.7.817-.35.255-.268.752-.562.934-.521.321-.897 1.366-1.639 1.361-.219-.001-1.151.364-1.273.007-.095-.258-.223-.455-.356-.71-.131-.25-.015-.51-.175-.731-.11-.154-.479-.502-.513-.684-.002-.157.118-.632.283-.715.231-.118.044-.462.016-.663-.048-.357-.27-.652-.535-.859-.393-.302-.189-.542-.098-.974 0-.206-.126-.476-.402-.396-.57.166-.396-.445-.812-.417-.299.021-.543.211-.821.295-.349.104-.707-.083-1.053-.126-1.421-.179-1.885-1.804-1.514-2.976.037-.192-.115-.547-.048-.696.159-.352.485-.752.768-1.021.16-.152.365-.113.553-.231.29-.182.294-.558.578-.789.404-.328.956-.321 1.482-.392.281-.037 1.35-.268 1.518-.06 0 .039.193.611-.019.578.438.023 1.061.756 1.476.585.213-.089.135-.744.573-.427.265.19 1.45.275 1.696.07.152-.125.236-.939.053-1.031.117.116-.618.125-.686.099-.122-.044-.235.115-.43.025.117.055-.651-.358-.22-.674-.181.132-.349-.037-.544.109-.135.109.062.181-.13.277-.305.155-.535-.53-.649-.607-.118-.077-1.024-.713-.777-.298l.797.793c-.04.026-.209-.289-.209-.059.053-.136.02.585-.105.35-.056-.09.091-.14.006-.271 0-.085-.23-.169-.275-.228-.126-.157-.462-.502-.644-.585-.05-.024-.771.088-.832.111-.071.099-.131.203-.181.314-.149.055-.29.127-.423.216l-.159.356c-.068.061-.772.294-.776.303.03-.076-.492-.172-.457-.324.038-.167.215-.687.169-.877-.048-.199 1.085.287 1.158-.238.029-.227.047-.492-.316-.531.069.008.702-.249.807-.364.148-.169.486-.447.731-.447.286 0 .225-.417.356-.622.133.053-.071.38.088.512-.01-.104.45.057.494.033.105-.056.691-.023.601-.299-.101-.28.052-.197.183-.255-.02.008.248-.458.363-.456-.104-.089-.398.112-.516.103-.308-.024-.177-.525-.061-.672.09-.116-.246-.258-.25-.036-.006.332-.314.633-.243 1.075.109.666-.743-.161-.816-.115-.283.172-.515-.216-.368-.449.149-.238.51-.226.659-.48.104-.179.227-.389.388-.524.541-.454.689-.091 1.229-.042.526.048.178.125.105.327-.07.192.289.261.413.1.071-.092.232-.326.301-.499.07-.175.578-.2.527-.365 2.72 1.148 4.827 3.465 5.694 6.318zm-11.113-3.779l.068-.087.073-.019c.042-.034.086-.118.151-.104.043.009.146.095.111.148-.037.054-.066-.049-.081.101-.018.169-.188.167-.313.222-.087.037-.175-.018-.09-.104l.088-.108-.007-.049zm.442.245c.046-.045.138-.008.151-.094.014-.084.078-.178-.008-.335-.022-.042.116-.082.051-.137l-.109.032s.155-.668.364-.366l-.089.103c.135.134.172.47.215.687.127.066.324.078.098.192.117-.02-.618.314-.715.178-.072-.083.317-.139.307-.173-.004-.011-.317-.02-.265-.087zm1.43-3.547l-.356.326c-.36.298-1.28.883-1.793.705-.524-.18-1.647.667-1.826.673-.067.003.002-.641.36-.689-.141.021.993-.575 1.185-.805.678-.146 1.381-.227 2.104-.227l.326.017zm-5.086 1.19c.07.082.278.092-.026.288-.183.11-.377.809-.548.809-.51.223-.542-.439-1.109.413-.078.115-.395.158-.644.236.685-.688 1.468-1.279 2.327-1.746zm-5.24 8.793c0-.541.055-1.068.139-1.586l.292.185c.113.135.113.719.169.911.139.482.484.751.748 1.19.155.261.414.923.332 1.197.109-.179 1.081.824 1.259 1.033.418.492.74 1.088.061 1.574-.219.158.334 1.14.049 1.382l-.365.094c-.225.138-.235.397-.166.631-1.562-1.765-2.518-4.076-2.518-6.611zm14.347-5.823c.083-.01-.107.167-.107.167.033.256.222.396.581.527.437.157.038.455-.213.385-.139-.039-.854-.255-.879.025 0 .167-.679.001-.573-.175.073-.119.05-.387.186-.562.193-.255.38-.116.386.032-.001.394.398-.373.619-.399z"/>
+                </svg>
            </div>
-        <!-- REPEAT END -->
+            <div class="tile">
+                <div class="top-row">
+                    <a href="{{link}}">{{name}}</a>
+                </div>
+                <div class="bottom-row">{{description}}</div>
+            </div>
+            <div class="menu-button center-flex"> ⯆ </div>
        </div>
    </body>
 </html>
@@ -111,7 +96,6 @@ _link_template_fancy = """
 _link_template_internet_shortcut = """
 [InternetShortcut]
 URL={{link}}
-Desc={{description}}
 """.strip()

 _learning_module_template = """
@@ -142,88 +126,6 @@ _learning_module_template = """
 </html>
 """

-_forum_thread_template = """
-<!DOCTYPE html>
-<html lang="en">
-    <head>
-        <meta charset="UTF-8">
-        <title>ILIAS - Forum: {{name}}</title>
-        <style>
-            * {
-                box-sizing: border-box;
-            }
-            body {
-                font-family: 'Open Sans', Verdana, Arial, Helvetica, sans-serif;
-                padding: 8px;
-            }
-            ul, ol, p {
-                margin: 1.2em 0;
-            }
-            p {
-                margin-top: 8px;
-                margin-bottom: 8px;
-            }
-            a {
-                color: #00876c;
-                text-decoration: none;
-                cursor: pointer;
-            }
-            a:hover {
-                text-decoration: underline;
-            }
-            body > p:first-child > span:first-child {
-                font-size: 1.6em;
-            }
-            body > p:first-child > span:first-child ~ span.default {
-                display: inline-block;
-                font-size: 1.2em;
-                padding-bottom: 8px;
-            }
-            .ilFrmPostContent {
-                margin-top: 8px;
-                max-width: 64em;
-            }
-            .ilFrmPostContent > *:first-child {
-                margin-top: 0px;
-            }
-            .ilFrmPostTitle {
-                margin-top: 24px;
-                color: #00876c;
-                font-weight: bold;
-            }
-            #ilFrmPostList {
-                list-style: none;
-                padding-left: 0;
-            }
-            li.ilFrmPostRow {
-                padding: 3px 0 3px 3px;
-                margin-bottom: 24px;
-                border-left: 6px solid #dddddd;
-            }
-            .ilFrmPostRow > div {
-                display: flex;
-            }
-            .ilFrmPostImage img {
-                margin: 0 !important;
-                padding: 6px 9px 9px 6px;
-            }
-            .ilUserIcon {
-                width: 115px;
-            }
-            .small {
-                text-decoration: none;
-                font-size: 0.75rem;
-                color: #6f6f6f;
-            }
-        </style>
-    </head>
-    <body>
-    {{heading}}
-    {{content}}
-    </body>
-</html>
-""".strip()  # noqa: E501 line too long
-

 def learning_module_template(body: bs4.Tag, name: str, prev: Optional[str], next: Optional[str]) -> str:
    # Seems to be comments, ignore those.
@@ -237,13 +139,13 @@ def learning_module_template(body: bs4.Tag, name: str, prev: Optional[str], next
        </div>
    """
    if prev and body.select_one(".ilc_page_lnav_LeftNavigation"):
-        text = cast(bs4.Tag, body.select_one(".ilc_page_lnav_LeftNavigation")).get_text().strip()
+        text = body.select_one(".ilc_page_lnav_LeftNavigation").getText().strip()
        left = f'<a href="{prev}">{text}</a>'
    else:
        left = "<span></span>"

    if next and body.select_one(".ilc_page_rnav_RightNavigation"):
-        text = cast(bs4.Tag, body.select_one(".ilc_page_rnav_RightNavigation")).get_text().strip()
+        text = body.select_one(".ilc_page_rnav_RightNavigation").getText().strip()
        right = f'<a href="{next}">{text}</a>'
    else:
        right = "<span></span>"
@@ -254,29 +156,12 @@ def learning_module_template(body: bs4.Tag, name: str, prev: Optional[str], next
        )

    if bot_nav := body.select_one(".ilc_page_bnav_BottomNavigation"):
-        bot_nav.replace_with(
-            soupify(nav_template.replace("{{left}}", left).replace("{{right}}", right).encode())
+        bot_nav.replace_with(soupify(nav_template.replace(
+            "{{left}}", left).replace("{{right}}", right).encode())
        )

-    body_str = body.prettify()
-    return _learning_module_template.replace("{{body}}", body_str).replace("{{name}}", name)
-
-
-def forum_thread_template(name: str, url: str, heading: bs4.Tag, content: bs4.Tag) -> str:
-    if title := heading.find(name="b"):
-        title.wrap(bs4.Tag(name="a", attrs={"href": url}))
-    return (
-        _forum_thread_template.replace("{{name}}", name)
-        .replace("{{heading}}", heading.prettify())
-        .replace("{{content}}", content.prettify())
-    )
-
-
-@dataclasses.dataclass
-class LinkData:
-    name: str
-    url: str
-    description: str
+    body = body.prettify()
+    return _learning_module_template.replace("{{body}}", body).replace("{{name}}", name)


 class Links(Enum):
@@ -296,9 +181,6 @@ class Links(Enum):
            return None
        raise ValueError("Missing switch case")

-    def collection_as_one(self) -> bool:
-        return self == Links.FANCY
-
    def extension(self) -> Optional[str]:
        if self == Links.FANCY:
            return ".html"
@@ -310,47 +192,10 @@ class Links(Enum):
            return None
        raise ValueError("Missing switch case")

-    def interpolate(self, redirect_delay: int, collection_name: str, links: list[LinkData]) -> str:
-        template = self.template()
-        if template is None:
-            raise ValueError("Cannot interpolate ignored links")
-
-        if len(links) == 1:
-            link = links[0]
-            content = template
-            content = content.replace("{{link}}", link.url)
-            content = content.replace("{{name}}", link.name)
-            content = content.replace("{{description}}", link.description)
-            content = content.replace("{{redirect_delay}}", str(redirect_delay))
-            return content
-        if self == Links.PLAINTEXT or self == Links.INTERNET_SHORTCUT:
-            return "\n".join(f"{link.url}" for link in links)
-
-        # All others get coerced to fancy
-        content = cast(str, Links.FANCY.template())
-        repeated_content = cast(
-            re.Match[str], re.search(r"<!-- REPEAT START -->([\s\S]+)<!-- REPEAT END -->", content)
-        ).group(1)
-
-        parts = []
-        for link in links:
-            instance = repeated_content
-            instance = instance.replace("{{link}}", link.url)
-            instance = instance.replace("{{name}}", link.name)
-            instance = instance.replace("{{description}}", link.description)
-            instance = instance.replace("{{redirect_delay}}", str(redirect_delay))
-            parts.append(instance)
-
-        content = content.replace(repeated_content, "\n".join(parts))
-        content = content.replace("{{name}}", collection_name)
-        content = re.sub(r"<!-- REPEAT REMOVE START -->[\s\S]+<!-- REPEAT REMOVE END -->", "", content)
-
-        return content
-
    @staticmethod
    def from_string(string: str) -> "Links":
        try:
            return Links(string)
        except ValueError:
-            options = [f"'{option.value}'" for option in Links]
-            raise ValueError(f"must be one of {', '.join(options)}") from None
+            raise ValueError("must be one of 'ignore', 'plaintext',"
+                             " 'html', 'internet-shortcut'")
--- a/PFERD/crawl/ilias/ilias_html_cleaner.py
+++ b/PFERD/crawl/ilias/ilias_html_cleaner.py
@@ -1,5 +1,3 @@
-from typing import cast
-
 from bs4 import BeautifulSoup, Comment, Tag

 _STYLE_TAG_CONTENT = """
@@ -14,13 +12,6 @@ _STYLE_TAG_CONTENT = """
      font-weight: bold;
    }

-    .row-flex {
-      display: flex;
-    }
-    .row-flex-wrap {
-      flex-wrap: wrap;
-    }
-
    .accordion-head {
      background-color: #f5f7fa;
      padding: 0.5rem 0;
@@ -39,10 +30,6 @@ _STYLE_TAG_CONTENT = """
      margin: 0.5rem 0;
    }

-    img {
-        background-color: white;
-    }
-
    body {
      padding: 1em;
      grid-template-columns: 1fr min(60rem, 90%) 1fr;
@@ -60,11 +47,12 @@ _ARTICLE_WORTHY_CLASSES = [
 def insert_base_markup(soup: BeautifulSoup) -> BeautifulSoup:
    head = soup.new_tag("head")
    soup.insert(0, head)
-    # Force UTF-8 encoding
-    head.append(soup.new_tag("meta", charset="utf-8"))

+    simplecss_link: Tag = soup.new_tag("link")
    # <link rel="stylesheet" href="https://cdn.simplecss.org/simple.css">
-    head.append(soup.new_tag("link", rel="stylesheet", href="https://cdn.simplecss.org/simple.css"))
+    simplecss_link["rel"] = "stylesheet"
+    simplecss_link["href"] = "https://cdn.simplecss.org/simple.css"
+    head.append(simplecss_link)

    # Basic style tags for compat
    style: Tag = soup.new_tag("style")
@@ -75,18 +63,18 @@ def insert_base_markup(soup: BeautifulSoup) -> BeautifulSoup:


 def clean(soup: BeautifulSoup) -> BeautifulSoup:
-    for block in cast(list[Tag], soup.find_all(class_=lambda x: x in _ARTICLE_WORTHY_CLASSES)):
+    for block in soup.find_all(class_=lambda x: x in _ARTICLE_WORTHY_CLASSES):
        block.name = "article"

-    for block in cast(list[Tag], soup.find_all("h3")):
+    for block in soup.find_all("h3"):
        block.name = "div"

-    for block in cast(list[Tag], soup.find_all("h1")):
+    for block in soup.find_all("h1"):
        block.name = "h3"

-    for block in cast(list[Tag], soup.find_all(class_="ilc_va_ihcap_VAccordIHeadCap")):
+    for block in soup.find_all(class_="ilc_va_ihcap_VAccordIHeadCap"):
        block.name = "h3"
-        block["class"] += ["accordion-head"]  # type: ignore
+        block["class"] += ["accordion-head"]

    for dummy in soup.select(".ilc_text_block_Standard.ilc_Paragraph"):
        children = list(dummy.children)
@@ -97,12 +85,7 @@ def clean(soup: BeautifulSoup) -> BeautifulSoup:
        if isinstance(type(children[0]), Comment):
            dummy.decompose()

-    # Delete video figures, as they can not be internalized anyway
-    for video in soup.select(".ilc_media_cont_MediaContainerHighlighted .ilPageVideo"):
-        if figure := video.find_parent("figure"):
-            figure.decompose()
-
-    for hrule_imposter in cast(list[Tag], soup.find_all(class_="ilc_section_Separator")):
+    for hrule_imposter in soup.find_all(class_="ilc_section_Separator"):
        hrule_imposter.insert(0, soup.new_tag("hr"))

    return soup
--- a/PFERD/crawl/ilias/ilias_web_crawler.py
+++ b/PFERD/crawl/ilias/ilias_web_crawler.py
--- a/PFERD/crawl/ilias/kit_ilias_html.py
+++ b/PFERD/crawl/ilias/kit_ilias_html.py
--- a/PFERD/crawl/ilias/kit_ilias_web_crawler.py
+++ b/PFERD/crawl/ilias/kit_ilias_web_crawler.py
--- a/PFERD/crawl/ilias/shibboleth_login.py
+++ b/PFERD/crawl/ilias/shibboleth_login.py
@@ -1,127 +0,0 @@
-from typing import Any, Optional, cast
-
-import aiohttp
-import yarl
-from bs4 import BeautifulSoup, Tag
-
-from ...auth import Authenticator, TfaAuthenticator
-from ...logging import log
-from ...utils import soupify
-from ..crawler import CrawlError
-
-
-class ShibbolethLogin:
-    """
-    Login via shibboleth system.
-    """
-
-    def __init__(
-        self, ilias_url: str, authenticator: Authenticator, tfa_authenticator: Optional[Authenticator]
-    ) -> None:
-        self._ilias_url = ilias_url
-        self._auth = authenticator
-        self._tfa_auth = tfa_authenticator
-
-    async def login(self, sess: aiohttp.ClientSession) -> None:
-        """
-        Performs the ILIAS Shibboleth authentication dance and saves the login
-        cookies it receieves.
-
-        This function should only be called whenever it is detected that you're
-        not logged in. The cookies obtained should be good for a few minutes,
-        maybe even an hour or two.
-        """
-
-        # Equivalent: Click on "Mit KIT-Account anmelden" button in
-        # https://ilias.studium.kit.edu/login.php
-        url = f"{self._ilias_url}/shib_login.php"
-        async with sess.get(url) as response:
-            shib_url = response.url
-            if str(shib_url).startswith(self._ilias_url):
-                log.explain("ILIAS recognized our shib token and logged us in in the background, returning")
-                return
-            soup: BeautifulSoup = soupify(await response.read())
-
-        # Attempt to login using credentials, if necessary
-        while not self._login_successful(soup):
-            # Searching the form here so that this fails before asking for
-            # credentials rather than after asking.
-            form = cast(Tag, soup.find("form", {"method": "post"}))
-            action = cast(str, form["action"])
-
-            # Equivalent: Enter credentials in
-            # https://idp.scc.kit.edu/idp/profile/SAML2/Redirect/SSO
-            url = str(shib_url.origin()) + action
-            username, password = await self._auth.credentials()
-            data = {
-                "_eventId_proceed": "",
-                "j_username": username,
-                "j_password": password,
-                "fudis_web_authn_assertion_input": "",
-            }
-            if csrf_token_input := form.find("input", {"name": "csrf_token"}):
-                data["csrf_token"] = csrf_token_input["value"]  # type: ignore
-            soup = await _post(sess, url, data)
-
-            if soup.find(id="attributeRelease"):
-                raise CrawlError(
-                    "ILIAS Shibboleth entitlements changed! "
-                    "Please log in once in your browser and review them"
-                )
-
-            if self._tfa_required(soup):
-                soup = await self._authenticate_tfa(sess, soup, shib_url)
-
-            if not self._login_successful(soup):
-                self._auth.invalidate_credentials()
-
-        # Equivalent: Being redirected via JS automatically
-        # (or clicking "Continue" if you have JS disabled)
-        relay_state = cast(Tag, soup.find("input", {"name": "RelayState"}))
-        saml_response = cast(Tag, soup.find("input", {"name": "SAMLResponse"}))
-        url = cast(str, cast(Tag, soup.find("form", {"method": "post"}))["action"])
-        data = {  # using the info obtained in the while loop above
-            "RelayState": cast(str, relay_state["value"]),
-            "SAMLResponse": cast(str, saml_response["value"]),
-        }
-        await sess.post(cast(str, url), data=data)
-
-    async def _authenticate_tfa(
-        self, session: aiohttp.ClientSession, soup: BeautifulSoup, shib_url: yarl.URL
-    ) -> BeautifulSoup:
-        if not self._tfa_auth:
-            self._tfa_auth = TfaAuthenticator("ilias-anon-tfa")
-
-        tfa_token = await self._tfa_auth.password()
-
-        # Searching the form here so that this fails before asking for
-        # credentials rather than after asking.
-        form = cast(Tag, soup.find("form", {"method": "post"}))
-        action = cast(str, form["action"])
-
-        # Equivalent: Enter token in
-        # https://idp.scc.kit.edu/idp/profile/SAML2/Redirect/SSO
-        url = str(shib_url.origin()) + action
-        username, password = await self._auth.credentials()
-        data = {
-            "_eventId_proceed": "",
-            "fudis_otp_input": tfa_token,
-        }
-        if csrf_token_input := form.find("input", {"name": "csrf_token"}):
-            data["csrf_token"] = csrf_token_input["value"]  # type: ignore
-        return await _post(session, url, data)
-
-    @staticmethod
-    def _login_successful(soup: BeautifulSoup) -> bool:
-        relay_state = soup.find("input", {"name": "RelayState"})
-        saml_response = soup.find("input", {"name": "SAMLResponse"})
-        return relay_state is not None and saml_response is not None
-
-    @staticmethod
-    def _tfa_required(soup: BeautifulSoup) -> bool:
-        return soup.find(id="fudiscr-form") is not None
-
-
-async def _post(session: aiohttp.ClientSession, url: str, data: Any) -> BeautifulSoup:
-    async with session.post(url, data=data) as response:
-        return soupify(await response.read())
--- a/PFERD/crawl/kit_ipd_crawler.py
+++ b/PFERD/crawl/kit_ipd_crawler.py
@@ -1,11 +1,8 @@
 import os
 import re
-from collections.abc import Awaitable, Generator, Iterable
 from dataclasses import dataclass
-from datetime import datetime
 from pathlib import PurePath
-from re import Pattern
-from typing import Any, Optional, Union, cast
+from typing import Awaitable, List, Optional, Pattern, Set, Tuple, Union
 from urllib.parse import urljoin

 from bs4 import BeautifulSoup, Tag
@@ -34,32 +31,33 @@ class KitIpdCrawlerSection(HttpCrawlerSection):
        return re.compile(regex)


-@dataclass
+@dataclass(unsafe_hash=True)
 class KitIpdFile:
    name: str
    url: str

-    def explain(self) -> None:
-        log.explain(f"File {self.name!r} (href={self.url!r})")
-

@dataclass
 class KitIpdFolder:
    name: str
-    entries: list[Union[KitIpdFile, "KitIpdFolder"]]
+    files: List[KitIpdFile]

    def explain(self) -> None:
        log.explain_topic(f"Folder {self.name!r}")
-        for entry in self.entries:
-            entry.explain()
+        for file in self.files:
+            log.explain(f"File {file.name!r} (href={file.url!r})")
+
+    def __hash__(self) -> int:
+        return self.name.__hash__()


 class KitIpdCrawler(HttpCrawler):
+
    def __init__(
-        self,
-        name: str,
-        section: KitIpdCrawlerSection,
-        config: Config,
+            self,
+            name: str,
+            section: KitIpdCrawlerSection,
+            config: Config,
    ):
        super().__init__(name, section, config)
        self._url = section.target()
@@ -70,96 +68,85 @@ class KitIpdCrawler(HttpCrawler):
        if not maybe_cl:
            return

-        tasks: list[Awaitable[None]] = []
+        tasks: List[Awaitable[None]] = []

        async with maybe_cl:
            for item in await self._fetch_items():
-                item.explain()
                if isinstance(item, KitIpdFolder):
-                    tasks.append(self._crawl_folder(PurePath("."), item))
+                    tasks.append(self._crawl_folder(item))
                else:
-                    log.explain_topic(f"Orphan file {item.name!r} (href={item.url!r})")
-                    log.explain("Attributing it to root folder")
-                    # do this here to at least be sequential and not parallel (rate limiting is hard, as the
-                    # crawl abstraction does not hold for these requests)
-                    etag, mtime = await self._request_resource_version(item.url)
-                    tasks.append(self._download_file(PurePath("."), item, etag, mtime))
+                    # Orphan files are placed in the root folder
+                    tasks.append(self._download_file(PurePath("."), item))

        await self.gather(tasks)

-    async def _crawl_folder(self, parent: PurePath, folder: KitIpdFolder) -> None:
-        path = parent / folder.name
+    async def _crawl_folder(self, folder: KitIpdFolder) -> None:
+        path = PurePath(folder.name)
        if not await self.crawl(path):
            return

-        tasks = []
-        for entry in folder.entries:
-            if isinstance(entry, KitIpdFolder):
-                tasks.append(self._crawl_folder(path, entry))
-            else:
-                # do this here to at least be sequential and not parallel (rate limiting is hard, as the crawl
-                # abstraction does not hold for these requests)
-                etag, mtime = await self._request_resource_version(entry.url)
-                tasks.append(self._download_file(path, entry, etag, mtime))
+        tasks = [self._download_file(path, file) for file in folder.files]

        await self.gather(tasks)

-    async def _download_file(
-        self, parent: PurePath, file: KitIpdFile, etag: Optional[str], mtime: Optional[datetime]
-    ) -> None:
+    async def _download_file(self, parent: PurePath, file: KitIpdFile) -> None:
        element_path = parent / file.name
-
-        prev_etag = self._get_previous_etag_from_report(element_path)
-        etag_differs = None if prev_etag is None else prev_etag != etag
-
-        maybe_dl = await self.download(element_path, etag_differs=etag_differs, mtime=mtime)
+        maybe_dl = await self.download(element_path)
        if not maybe_dl:
-            # keep storing the known file's etag
-            if prev_etag:
-                self._add_etag_to_report(element_path, prev_etag)
            return

        async with maybe_dl as (bar, sink):
-            await self._stream_from_url(file.url, element_path, sink, bar)
+            await self._stream_from_url(file.url, sink, bar)

-    async def _fetch_items(self) -> Iterable[KitIpdFile | KitIpdFolder]:
+    async def _fetch_items(self) -> Set[Union[KitIpdFile, KitIpdFolder]]:
        page, url = await self.get_page()
-        elements: list[Tag] = self._find_file_links(page)
+        elements: List[Tag] = self._find_file_links(page)
+        items: Set[Union[KitIpdFile, KitIpdFolder]] = set()

-        # do not add unnecessary nesting for a single <h1> heading
-        drop_h1: bool = len(page.find_all(name="h1")) <= 1
-
-        folder_tree: KitIpdFolder = KitIpdFolder(".", [])
        for element in elements:
-            parent = HttpCrawler.get_folder_structure_from_heading_hierarchy(element, drop_h1)
-            file = self._extract_file(element, url)
+            folder_label = self._find_folder_label(element)
+            if folder_label:
+                folder = self._extract_folder(folder_label, url)
+                if folder not in items:
+                    items.add(folder)
+                    folder.explain()
+            else:
+                file = self._extract_file(element, url)
+                items.add(file)
+                log.explain_topic(f"Orphan file {file.name!r} (href={file.url!r})")
+                log.explain("Attributing it to root folder")

-            current_folder: KitIpdFolder = folder_tree
-            for folder_name in parent.parts:
-                # helps the type checker to verify that current_folder is indeed a folder
-                def subfolders() -> Generator[KitIpdFolder, Any, None]:
-                    return (entry for entry in current_folder.entries if isinstance(entry, KitIpdFolder))
+        return items

-                if not any(entry.name == folder_name for entry in subfolders()):
-                    current_folder.entries.append(KitIpdFolder(folder_name, []))
-                current_folder = next(entry for entry in subfolders() if entry.name == folder_name)
+    def _extract_folder(self, folder_tag: Tag, url: str) -> KitIpdFolder:
+        files: List[KitIpdFile] = []
+        name = folder_tag.getText().strip()

-            current_folder.entries.append(file)
+        container: Tag = folder_tag.findNextSibling(name="table")
+        for link in self._find_file_links(container):
+            files.append(self._extract_file(link, url))

-        return folder_tree.entries
+        return KitIpdFolder(name, files)
+
+    @staticmethod
+    def _find_folder_label(file_link: Tag) -> Optional[Tag]:
+        enclosing_table: Tag = file_link.findParent(name="table")
+        if enclosing_table is None:
+            return None
+        return enclosing_table.findPreviousSibling(name=re.compile("^h[1-6]$"))

    def _extract_file(self, link: Tag, url: str) -> KitIpdFile:
        url = self._abs_url_from_link(url, link)
        name = os.path.basename(url)
        return KitIpdFile(name, url)

-    def _find_file_links(self, tag: Tag | BeautifulSoup) -> list[Tag]:
-        return cast(list[Tag], tag.find_all(name="a", attrs={"href": self._file_regex}))
+    def _find_file_links(self, tag: Union[Tag, BeautifulSoup]) -> List[Tag]:
+        return tag.findAll(name="a", attrs={"href": self._file_regex})

    def _abs_url_from_link(self, url: str, link_tag: Tag) -> str:
-        return urljoin(url, cast(str, link_tag.get("href")))
+        return urljoin(url, link_tag.get("href"))

-    async def _stream_from_url(self, url: str, path: PurePath, sink: FileSink, bar: ProgressBar) -> None:
+    async def _stream_from_url(self, url: str, sink: FileSink, bar: ProgressBar) -> None:
        async with self.session.get(url, allow_redirects=False) as resp:
            if resp.status == 403:
                raise CrawlError("Received a 403. Are you within the KIT network/VPN?")
@@ -172,9 +159,7 @@ class KitIpdCrawler(HttpCrawler):

            sink.done()

-            self._add_etag_to_report(path, resp.headers.get("ETag"))
-
-    async def get_page(self) -> tuple[BeautifulSoup, str]:
+    async def get_page(self) -> Tuple[BeautifulSoup, str]:
        async with self.session.get(self._url) as request:
            # The web page for Algorithmen für Routenplanung contains some
            # weird comments that beautifulsoup doesn't parse correctly. This
--- a/PFERD/crawl/local_crawler.py
+++ b/PFERD/crawl/local_crawler.py
@@ -18,28 +18,31 @@ class LocalCrawlerSection(CrawlerSection):
    def crawl_delay(self) -> float:
        value = self.s.getfloat("crawl_delay", fallback=0.0)
        if value < 0:
-            self.invalid_value("crawl_delay", value, "Must not be negative")
+            self.invalid_value("crawl_delay", value,
+                               "Must not be negative")
        return value

    def download_delay(self) -> float:
        value = self.s.getfloat("download_delay", fallback=0.0)
        if value < 0:
-            self.invalid_value("download_delay", value, "Must not be negative")
+            self.invalid_value("download_delay", value,
+                               "Must not be negative")
        return value

    def download_speed(self) -> Optional[int]:
        value = self.s.getint("download_speed")
        if value is not None and value <= 0:
-            self.invalid_value("download_speed", value, "Must be greater than 0")
+            self.invalid_value("download_speed", value,
+                               "Must be greater than 0")
        return value


 class LocalCrawler(Crawler):
    def __init__(
-        self,
-        name: str,
-        section: LocalCrawlerSection,
-        config: Config,
+            self,
+            name: str,
+            section: LocalCrawlerSection,
+            config: Config,
    ):
        super().__init__(name, section, config)

@@ -71,12 +74,10 @@ class LocalCrawler(Crawler):
        tasks = []

        async with cl:
-            await asyncio.sleep(
-                random.uniform(
-                    0.5 * self._crawl_delay,
-                    self._crawl_delay,
-                )
-            )
+            await asyncio.sleep(random.uniform(
+                0.5 * self._crawl_delay,
+                self._crawl_delay,
+            ))

            for child in path.iterdir():
                pure_child = cl.path / child.name
@@ -92,12 +93,10 @@ class LocalCrawler(Crawler):
            return

        async with dl as (bar, sink):
-            await asyncio.sleep(
-                random.uniform(
-                    0.5 * self._download_delay,
-                    self._download_delay,
-                )
-            )
+            await asyncio.sleep(random.uniform(
+                0.5 * self._download_delay,
+                self._download_delay,
+            ))

            bar.set_total(stat.st_size)

--- a/PFERD/deduplicator.py
+++ b/PFERD/deduplicator.py
@@ -1,5 +1,5 @@
-from collections.abc import Iterator
 from pathlib import PurePath
+from typing import Iterator, Set

 from .logging import log
 from .utils import fmt_path
@@ -16,34 +16,15 @@ def name_variants(path: PurePath) -> Iterator[PurePath]:
 class Deduplicator:
    FORBIDDEN_CHARS = '<>:"/\\|?*' + "".join([chr(i) for i in range(0, 32)])
    FORBIDDEN_NAMES = {
-        "CON",
-        "PRN",
-        "AUX",
-        "NUL",
-        "COM1",
-        "COM2",
-        "COM3",
-        "COM4",
-        "COM5",
-        "COM6",
-        "COM7",
-        "COM8",
-        "COM9",
-        "LPT1",
-        "LPT2",
-        "LPT3",
-        "LPT4",
-        "LPT5",
-        "LPT6",
-        "LPT7",
-        "LPT8",
-        "LPT9",
+        "CON", "PRN", "AUX", "NUL",
+        "COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9",
+        "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9",
    }

    def __init__(self, windows_paths: bool) -> None:
        self._windows_paths = windows_paths

-        self._known: set[PurePath] = set()
+        self._known: Set[PurePath] = set()

    def _add(self, path: PurePath) -> None:
        self._known.add(path)
--- a/PFERD/limiter.py
+++ b/PFERD/limiter.py
@@ -1,9 +1,8 @@
 import asyncio
 import time
-from collections.abc import AsyncIterator
 from contextlib import asynccontextmanager
 from dataclasses import dataclass
-from typing import Optional
+from typing import AsyncIterator, Optional


@dataclass
@@ -13,7 +12,12 @@ class Slot:


 class Limiter:
-    def __init__(self, task_limit: int, download_limit: int, task_delay: float):
+    def __init__(
+            self,
+            task_limit: int,
+            download_limit: int,
+            task_delay: float
+    ):
        if task_limit <= 0:
            raise ValueError("task limit must be at least 1")
        if download_limit <= 0:
--- a/PFERD/logging.py
+++ b/PFERD/logging.py
@@ -1,23 +1,16 @@
 import asyncio
 import sys
 import traceback
-from collections.abc import AsyncIterator, Iterator
-from contextlib import AbstractContextManager, asynccontextmanager, contextmanager
-from typing import Any, Optional
+from contextlib import asynccontextmanager, contextmanager
+# TODO In Python 3.9 and above, ContextManager is deprecated
+from typing import AsyncIterator, ContextManager, Iterator, List, Optional

 from rich.console import Console, Group
 from rich.live import Live
 from rich.markup import escape
 from rich.panel import Panel
-from rich.progress import (
-    BarColumn,
-    DownloadColumn,
-    Progress,
-    TaskID,
-    TextColumn,
-    TimeRemainingColumn,
-    TransferSpeedColumn,
-)
+from rich.progress import (BarColumn, DownloadColumn, Progress, TaskID, TextColumn, TimeRemainingColumn,
+                           TransferSpeedColumn)
 from rich.table import Column


@@ -61,7 +54,7 @@ class Log:
        self._showing_progress = False
        self._progress_suspended = False
        self._lock = asyncio.Lock()
-        self._lines: list[str] = []
+        self._lines: List[str] = []

        # Whether different parts of the output are enabled or disabled
        self.output_explain = False
@@ -122,7 +115,7 @@ class Log:
        for line in self._lines:
            self.print(line)

-    def print(self, text: Any) -> None:
+    def print(self, text: str) -> None:
        """
        Print a normal message. Allows markup.
        """
@@ -184,14 +177,10 @@ class Log:
        # Our print function doesn't take types other than strings, but the
        # underlying rich.print function does. This call is a special case
        # anyways, and we're calling it internally, so this should be fine.
-        self.print(
-            Panel.fit(
-                """
+        self.print(Panel.fit("""
 Please copy your program output and send it to the PFERD maintainers, either
 directly or as a GitHub issue: https://github.com/Garmelon/PFERD/issues/new
-        """.strip()
-            )
-        )
+        """.strip()))  # type: ignore

    def explain_topic(self, text: str) -> None:
        """
@@ -248,10 +237,10 @@ directly or as a GitHub issue: https://github.com/Garmelon/PFERD/issues/new

    @contextmanager
    def _bar(
-        self,
-        progress: Progress,
-        description: str,
-        total: Optional[float],
+            self,
+            progress: Progress,
+            description: str,
+            total: Optional[float],
    ) -> Iterator[ProgressBar]:
        if total is None:
            # Indeterminate progress bar
@@ -267,12 +256,12 @@ directly or as a GitHub issue: https://github.com/Garmelon/PFERD/issues/new
            self._update_live()

    def crawl_bar(
-        self,
-        style: str,
-        action: str,
-        text: str,
-        total: Optional[float] = None,
-    ) -> AbstractContextManager[ProgressBar]:
+            self,
+            style: str,
+            action: str,
+            text: str,
+            total: Optional[float] = None,
+    ) -> ContextManager[ProgressBar]:
        """
        Allows markup in the "style" argument which will be applied to the
        "action" string.
@@ -283,12 +272,12 @@ directly or as a GitHub issue: https://github.com/Garmelon/PFERD/issues/new
        return self._bar(self._crawl_progress, description, total)

    def download_bar(
-        self,
-        style: str,
-        action: str,
-        text: str,
-        total: Optional[float] = None,
-    ) -> AbstractContextManager[ProgressBar]:
+            self,
+            style: str,
+            action: str,
+            text: str,
+            total: Optional[float] = None,
+    ) -> ContextManager[ProgressBar]:
        """
        Allows markup in the "style" argument which will be applied to the
        "action" string.
--- a/PFERD/output_dir.py
+++ b/PFERD/output_dir.py
@@ -4,13 +4,12 @@ import os
 import random
 import shutil
 import string
-from collections.abc import Iterator
-from contextlib import contextmanager, suppress
+from contextlib import contextmanager
 from dataclasses import dataclass
 from datetime import datetime
 from enum import Enum
 from pathlib import Path, PurePath
-from typing import BinaryIO, Optional
+from typing import BinaryIO, Iterator, Optional, Tuple

 from .logging import log
 from .report import Report, ReportLoadError
@@ -36,7 +35,8 @@ class Redownload(Enum):
        try:
            return Redownload(string)
        except ValueError:
-            raise ValueError("must be one of 'never', 'never-smart', 'always', 'always-smart'") from None
+            raise ValueError("must be one of 'never', 'never-smart',"
+                             " 'always', 'always-smart'")


 class OnConflict(Enum):
@@ -51,15 +51,12 @@ class OnConflict(Enum):
        try:
            return OnConflict(string)
        except ValueError:
-            raise ValueError(
-                "must be one of 'prompt', 'local-first',"
-                " 'remote-first', 'no-delete', 'no-delete-prompt-overwrite'"
-            ) from None
+            raise ValueError("must be one of 'prompt', 'local-first',"
+                             " 'remote-first', 'no-delete', 'no-delete-prompt-overwrite'")


@dataclass
 class Heuristics:
-    etag_differs: Optional[bool]
    mtime: Optional[datetime]


@@ -98,13 +95,13 @@ class FileSinkToken(ReusableAsyncContextManager[FileSink]):
    # download handed back to the OutputDirectory.

    def __init__(
-        self,
-        output_dir: "OutputDirectory",
-        remote_path: PurePath,
-        path: PurePath,
-        local_path: Path,
-        heuristics: Heuristics,
-        on_conflict: OnConflict,
+            self,
+            output_dir: "OutputDirectory",
+            remote_path: PurePath,
+            path: PurePath,
+            local_path: Path,
+            heuristics: Heuristics,
+            on_conflict: OnConflict,
    ):
        super().__init__()

@@ -120,17 +117,15 @@ class FileSinkToken(ReusableAsyncContextManager[FileSink]):
        sink = FileSink(file)

        async def after_download() -> None:
-            await self._output_dir._after_download(
-                DownloadInfo(
-                    self._remote_path,
-                    self._path,
-                    self._local_path,
-                    tmp_path,
-                    self._heuristics,
-                    self._on_conflict,
-                    sink.is_done(),
-                )
-            )
+            await self._output_dir._after_download(DownloadInfo(
+                self._remote_path,
+                self._path,
+                self._local_path,
+                tmp_path,
+                self._heuristics,
+                self._on_conflict,
+                sink.is_done(),
+            ))

        self._stack.push_async_callback(after_download)
        self._stack.enter_context(file)
@@ -142,10 +137,10 @@ class OutputDirectory:
    REPORT_FILE = PurePath(".report")

    def __init__(
-        self,
-        root: Path,
-        redownload: Redownload,
-        on_conflict: OnConflict,
+            self,
+            root: Path,
+            redownload: Redownload,
+            on_conflict: OnConflict,
    ):
        if os.name == "nt":
            # Windows limits the path length to 260 for some historical reason.
@@ -178,8 +173,8 @@ class OutputDirectory:

        try:
            self._root.mkdir(parents=True, exist_ok=True)
-        except OSError as e:
-            raise OutputDirError("Failed to create base directory") from e
+        except OSError:
+            raise OutputDirError("Failed to create base directory")

    def register_reserved(self, path: PurePath) -> None:
        self._report.mark_reserved(path)
@@ -197,11 +192,11 @@ class OutputDirectory:
        return self._root / path

    def _should_download(
-        self,
-        local_path: Path,
-        heuristics: Heuristics,
-        redownload: Redownload,
-        on_conflict: OnConflict,
+            self,
+            local_path: Path,
+            heuristics: Heuristics,
+            redownload: Redownload,
+            on_conflict: OnConflict,
    ) -> bool:
        if not local_path.exists():
            log.explain("No corresponding file present locally")
@@ -238,16 +233,8 @@ class OutputDirectory:

        remote_newer = None

-        # ETag should be a more reliable indicator than mtime, so we check it first
-        if heuristics.etag_differs is not None:
-            remote_newer = heuristics.etag_differs
-            if remote_newer:
-                log.explain("Remote file's entity tag differs")
-            else:
-                log.explain("Remote file's entity tag is the same")
-
        # Python on Windows crashes when faced with timestamps around the unix epoch
-        if remote_newer is None and heuristics.mtime and (os.name != "nt" or heuristics.mtime.year > 1970):
+        if heuristics.mtime and (os.name != "nt" or heuristics.mtime.year > 1970):
            mtime = heuristics.mtime
            remote_newer = mtime.timestamp() > stat.st_mtime
            if remote_newer:
@@ -274,9 +261,9 @@ class OutputDirectory:
    # files.

    async def _conflict_lfrf(
-        self,
-        on_conflict: OnConflict,
-        path: PurePath,
+            self,
+            on_conflict: OnConflict,
+            path: PurePath,
    ) -> bool:
        if on_conflict in {OnConflict.PROMPT, OnConflict.NO_DELETE_PROMPT_OVERWRITE}:
            async with log.exclusive_output():
@@ -293,9 +280,9 @@ class OutputDirectory:
        raise ValueError(f"{on_conflict!r} is not a valid conflict policy")

    async def _conflict_ldrf(
-        self,
-        on_conflict: OnConflict,
-        path: PurePath,
+            self,
+            on_conflict: OnConflict,
+            path: PurePath,
    ) -> bool:
        if on_conflict in {OnConflict.PROMPT, OnConflict.NO_DELETE_PROMPT_OVERWRITE}:
            async with log.exclusive_output():
@@ -312,10 +299,10 @@ class OutputDirectory:
        raise ValueError(f"{on_conflict!r} is not a valid conflict policy")

    async def _conflict_lfrd(
-        self,
-        on_conflict: OnConflict,
-        path: PurePath,
-        parent: PurePath,
+            self,
+            on_conflict: OnConflict,
+            path: PurePath,
+            parent: PurePath,
    ) -> bool:
        if on_conflict in {OnConflict.PROMPT, OnConflict.NO_DELETE_PROMPT_OVERWRITE}:
            async with log.exclusive_output():
@@ -332,9 +319,9 @@ class OutputDirectory:
        raise ValueError(f"{on_conflict!r} is not a valid conflict policy")

    async def _conflict_delete_lf(
-        self,
-        on_conflict: OnConflict,
-        path: PurePath,
+            self,
+            on_conflict: OnConflict,
+            path: PurePath,
    ) -> bool:
        if on_conflict == OnConflict.PROMPT:
            async with log.exclusive_output():
@@ -357,9 +344,9 @@ class OutputDirectory:
        return base.parent / name

    async def _create_tmp_file(
-        self,
-        local_path: Path,
-    ) -> tuple[Path, BinaryIO]:
+            self,
+            local_path: Path,
+    ) -> Tuple[Path, BinaryIO]:
        """
        May raise an OutputDirError.
        """
@@ -375,38 +362,20 @@ class OutputDirectory:

        raise OutputDirError("Failed to create temporary file")

-    def should_try_download(
-        self,
-        path: PurePath,
-        *,
-        etag_differs: Optional[bool] = None,
-        mtime: Optional[datetime] = None,
-        redownload: Optional[Redownload] = None,
-        on_conflict: Optional[OnConflict] = None,
-    ) -> bool:
-        heuristics = Heuristics(etag_differs, mtime)
-        redownload = self._redownload if redownload is None else redownload
-        on_conflict = self._on_conflict if on_conflict is None else on_conflict
-        local_path = self.resolve(path)
-
-        return self._should_download(local_path, heuristics, redownload, on_conflict)
-
    async def download(
-        self,
-        remote_path: PurePath,
-        path: PurePath,
-        *,
-        etag_differs: Optional[bool] = None,
-        mtime: Optional[datetime] = None,
-        redownload: Optional[Redownload] = None,
-        on_conflict: Optional[OnConflict] = None,
+            self,
+            remote_path: PurePath,
+            path: PurePath,
+            mtime: Optional[datetime] = None,
+            redownload: Optional[Redownload] = None,
+            on_conflict: Optional[OnConflict] = None,
    ) -> Optional[FileSinkToken]:
        """
        May throw an OutputDirError, a MarkDuplicateError or a
        MarkConflictError.
        """

-        heuristics = Heuristics(etag_differs, mtime)
+        heuristics = Heuristics(mtime)
        redownload = self._redownload if redownload is None else redownload
        on_conflict = self._on_conflict if on_conflict is None else on_conflict
        local_path = self.resolve(path)
@@ -446,6 +415,7 @@ class OutputDirectory:

    def _update_metadata(self, info: DownloadInfo) -> None:
        if mtime := info.heuristics.mtime:
+            log.explain(f"Setting mtime to {mtime}")
            mtimestamp = mtime.timestamp()
            os.utime(info.local_path, times=(mtimestamp, mtimestamp))

@@ -510,8 +480,10 @@ class OutputDirectory:
            await self._cleanup(child, pure_child)

        if delete_self:
-            with suppress(OSError):
+            try:
                path.rmdir()
+            except OSError:
+                pass

    async def _cleanup_file(self, path: Path, pure: PurePath) -> None:
        if self._report.is_marked(pure):
--- a/PFERD/pferd.py
+++ b/PFERD/pferd.py
@@ -1,5 +1,5 @@
-from pathlib import Path, PurePath
-from typing import Optional
+from pathlib import Path
+from typing import Dict, List, Optional

 from rich.markup import escape

@@ -15,7 +15,7 @@ class PferdLoadError(Exception):


 class Pferd:
-    def __init__(self, config: Config, cli_crawlers: Optional[list[str]], cli_skips: Optional[list[str]]):
+    def __init__(self, config: Config, cli_crawlers: Optional[List[str]], cli_skips: Optional[List[str]]):
        """
        May throw PferdLoadError.
        """
@@ -23,10 +23,10 @@ class Pferd:
        self._config = config
        self._crawlers_to_run = self._find_crawlers_to_run(config, cli_crawlers, cli_skips)

-        self._authenticators: dict[str, Authenticator] = {}
-        self._crawlers: dict[str, Crawler] = {}
+        self._authenticators: Dict[str, Authenticator] = {}
+        self._crawlers: Dict[str, Crawler] = {}

-    def _find_config_crawlers(self, config: Config) -> list[str]:
+    def _find_config_crawlers(self, config: Config) -> List[str]:
        crawl_sections = []

        for name, section in config.crawl_sections():
@@ -37,7 +37,7 @@ class Pferd:

        return crawl_sections

-    def _find_cli_crawlers(self, config: Config, cli_crawlers: list[str]) -> list[str]:
+    def _find_cli_crawlers(self, config: Config, cli_crawlers: List[str]) -> List[str]:
        if len(cli_crawlers) != len(set(cli_crawlers)):
            raise PferdLoadError("Some crawlers were selected multiple times")

@@ -66,14 +66,14 @@ class Pferd:
        return crawlers_to_run

    def _find_crawlers_to_run(
-        self,
-        config: Config,
-        cli_crawlers: Optional[list[str]],
-        cli_skips: Optional[list[str]],
-    ) -> list[str]:
+            self,
+            config: Config,
+            cli_crawlers: Optional[List[str]],
+            cli_skips: Optional[List[str]],
+    ) -> List[str]:
        log.explain_topic("Deciding which crawlers to run")

-        crawlers: list[str]
+        crawlers: List[str]
        if cli_crawlers is None:
            log.explain("No crawlers specified on CLI")
            log.explain("Running crawlers specified in config")
@@ -104,7 +104,7 @@ class Pferd:

    def _load_crawlers(self) -> None:
        # Cookie sharing
-        kit_ilias_web_paths: dict[Authenticator, list[Path]] = {}
+        kit_ilias_web_paths: Dict[Authenticator, List[Path]] = {}

        for name, section in self._config.crawl_sections():
            log.print(f"[bold bright_cyan]Loading[/] {escape(name)}")
@@ -117,8 +117,9 @@ class Pferd:
            crawler = crawler_constructor(name, section, self._config, self._authenticators)
            self._crawlers[name] = crawler

-            if self._config.default_section.share_cookies() and isinstance(crawler, KitIliasWebCrawler):
-                crawler.share_cookies(kit_ilias_web_paths)
+            if self._config.default_section.share_cookies():
+                if isinstance(crawler, KitIliasWebCrawler):
+                    crawler.share_cookies(kit_ilias_web_paths)

    def debug_transforms(self) -> None:
        for name in self._crawlers_to_run:
@@ -160,32 +161,26 @@ class Pferd:

    def print_report(self) -> None:
        for name in self._crawlers_to_run:
-            crawlerOpt = self._crawlers.get(name)
-            if crawlerOpt is None:
+            crawler = self._crawlers.get(name)
+            if crawler is None:
                continue  # Crawler failed to load
-            crawler = crawlerOpt

            log.report("")
            log.report(f"[bold bright_cyan]Report[/] for {escape(name)}")

-            def fmt_path_link(relative_path: PurePath) -> str:
-                # We need to URL-encode the path because it might contain spaces or special characters
-                link = crawler.output_dir.resolve(relative_path).absolute().as_uri()
-                return f"[link={link}]{fmt_path(relative_path)}[/link]"
-
            something_changed = False
            for path in sorted(crawler.report.added_files):
                something_changed = True
-                log.report(f"  [bold bright_green]Added[/] {fmt_path_link(path)}")
+                log.report(f"  [bold bright_green]Added[/] {fmt_path(path)}")
            for path in sorted(crawler.report.changed_files):
                something_changed = True
-                log.report(f"  [bold bright_yellow]Changed[/] {fmt_path_link(path)}")
+                log.report(f"  [bold bright_yellow]Changed[/] {fmt_path(path)}")
            for path in sorted(crawler.report.deleted_files):
                something_changed = True
                log.report(f"  [bold bright_magenta]Deleted[/] {fmt_path(path)}")
            for path in sorted(crawler.report.not_deleted_files):
                something_changed = True
-                log.report_not_deleted(f"  [bold bright_magenta]Not deleted[/] {fmt_path_link(path)}")
+                log.report_not_deleted(f"  [bold bright_magenta]Not deleted[/] {fmt_path(path)}")

            for warning in crawler.report.encountered_warnings:
                something_changed = True
--- a/PFERD/report.py
+++ b/PFERD/report.py
@@ -1,6 +1,6 @@
 import json
 from pathlib import Path, PurePath
-from typing import Any, Optional
+from typing import Any, Dict, List, Optional, Set


 class ReportLoadError(Exception):
@@ -34,6 +34,15 @@ class MarkConflictError(Exception):
        self.collides_with = collides_with


+# TODO Use PurePath.is_relative_to when updating to 3.9
+def is_relative_to(a: PurePath, b: PurePath) -> bool:
+    try:
+        a.relative_to(b)
+        return True
+    except ValueError:
+        return False
+
+
 class Report:
    """
    A report of a synchronization. Includes all files found by the crawler, as
@@ -42,32 +51,32 @@ class Report:

    def __init__(self) -> None:
        # Paths found by the crawler, untransformed
-        self.found_paths: set[PurePath] = set()
+        self.found_paths: Set[PurePath] = set()

        # Files reserved for metadata files (e. g. the report file or cookies)
        # that can't be overwritten by user transforms and won't be cleaned up
        # at the end.
-        self.reserved_files: set[PurePath] = set()
+        self.reserved_files: Set[PurePath] = set()

        # Files found by the crawler, transformed. Only includes files that
        # were downloaded (or a download was attempted)
-        self.known_files: set[PurePath] = set()
+        self.known_files: Set[PurePath] = set()

-        self.added_files: set[PurePath] = set()
-        self.changed_files: set[PurePath] = set()
-        self.deleted_files: set[PurePath] = set()
+        self.added_files: Set[PurePath] = set()
+        self.changed_files: Set[PurePath] = set()
+        self.deleted_files: Set[PurePath] = set()
        # Files that should have been deleted by the cleanup but weren't
-        self.not_deleted_files: set[PurePath] = set()
+        self.not_deleted_files: Set[PurePath] = set()

        # Custom crawler-specific data
-        self.custom: dict[str, Any] = dict()
+        self.custom: Dict[str, Any] = dict()

        # Encountered errors and warnings
-        self.encountered_warnings: list[str] = []
-        self.encountered_errors: list[str] = []
+        self.encountered_warnings: List[str] = []
+        self.encountered_errors: List[str] = []

    @staticmethod
-    def _get_list_of_strs(data: dict[str, Any], key: str) -> list[str]:
+    def _get_list_of_strs(data: Dict[str, Any], key: str) -> List[str]:
        result: Any = data.get(key, [])

        if not isinstance(result, list):
@@ -80,8 +89,8 @@ class Report:
        return result

    @staticmethod
-    def _get_str_dictionary(data: dict[str, Any], key: str) -> dict[str, Any]:
-        result: dict[str, Any] = data.get(key, {})
+    def _get_str_dictionary(data: Dict[str, Any], key: str) -> Dict[str, Any]:
+        result: Dict[str, Any] = data.get(key, {})

        if not isinstance(result, dict):
            raise ReportLoadError(f"Incorrect format: {key!r} is not a dictionary")
@@ -164,13 +173,13 @@ class Report:
            if path == other:
                raise MarkDuplicateError(path)

-            if path.is_relative_to(other) or other.is_relative_to(path):
+            if is_relative_to(path, other) or is_relative_to(other, path):
                raise MarkConflictError(path, other)

        self.known_files.add(path)

    @property
-    def marked(self) -> set[PurePath]:
+    def marked(self) -> Set[PurePath]:
        return self.known_files | self.reserved_files

    def is_marked(self, path: PurePath) -> bool:
--- a/PFERD/transformer.py
+++ b/PFERD/transformer.py
@@ -1,12 +1,10 @@
 import ast
-import contextlib
 import re
 from abc import ABC, abstractmethod
-from collections.abc import Callable, Sequence
 from dataclasses import dataclass
 from enum import Enum
 from pathlib import PurePath
-from typing import Optional, TypeVar
+from typing import Callable, Dict, List, Optional, Sequence, TypeVar, Union

 from .logging import log
 from .utils import fmt_path, str_path
@@ -25,7 +23,7 @@ class Empty:
    pass


-RightSide = str | Ignore | Empty
+RightSide = Union[str, Ignore, Empty]


@dataclass
@@ -37,7 +35,7 @@ class Ignored:
    pass


-TransformResult = Transformed | Ignored | None
+TransformResult = Optional[Union[Transformed, Ignored]]


@dataclass
@@ -49,7 +47,7 @@ class Rule:
    right: RightSide
    right_index: int

-    def right_result(self, path: PurePath) -> str | Transformed | Ignored:
+    def right_result(self, path: PurePath) -> Union[str, Transformed, Ignored]:
        if isinstance(self.right, str):
            return self.right
        elif isinstance(self.right, Ignore):
@@ -95,22 +93,22 @@ class ExactReTf(Transformation):
        # since elements of "match.groups()" can be None, mypy is wrong.
        groups: Sequence[Optional[str]] = [match[0]] + list(match.groups())

-        locals_dir: dict[str, str | int | float] = {}
+        locals_dir: Dict[str, Union[str, int, float]] = {}
        for i, group in enumerate(groups):
            if group is None:
                continue

            locals_dir[f"g{i}"] = group

-            with contextlib.suppress(ValueError):
+            try:
                locals_dir[f"i{i}"] = int(group)
+            except ValueError:
+                pass

-            with contextlib.suppress(ValueError):
+            try:
                locals_dir[f"f{i}"] = float(group)
-
-        named_groups: dict[str, str] = match.groupdict()
-        for name, capture in named_groups.items():
-            locals_dir[name] = capture
+            except ValueError:
+                pass

        result = eval(f"f{right!r}", {}, locals_dir)
        return Transformed(PurePath(result))
@@ -206,7 +204,7 @@ class Line:

    @property
    def rest(self) -> str:
-        return self.line[self.index :]
+        return self.line[self.index:]

    def peek(self, amount: int = 1) -> str:
        return self.rest[:amount]
@@ -226,7 +224,7 @@ class Line:
        self.expect(string)
        return value

-    def one_of(self, parsers: list[Callable[[], T]], description: str) -> T:
+    def one_of(self, parsers: List[Callable[[], T]], description: str) -> T:
        for parser in parsers:
            index = self.index
            try:
@@ -313,7 +311,7 @@ def parse_left(line: Line) -> str:
        return parse_str(line)


-def parse_right(line: Line) -> str | Ignore:
+def parse_right(line: Line) -> Union[str, Ignore]:
    c = line.peek()
    if c in QUOTATION_MARKS:
        return parse_quoted_str(line)
@@ -325,27 +323,21 @@ def parse_right(line: Line) -> str | Ignore:


 def parse_arrow_name(line: Line) -> str:
-    return line.one_of(
-        [
-            lambda: line.expect("exact-re"),
-            lambda: line.expect("exact"),
-            lambda: line.expect("name-re"),
-            lambda: line.expect("name"),
-            lambda: line.expect("re"),
-            lambda: line.expect(""),
-        ],
-        "Expected arrow name",
-    )
+    return line.one_of([
+        lambda: line.expect("exact-re"),
+        lambda: line.expect("exact"),
+        lambda: line.expect("name-re"),
+        lambda: line.expect("name"),
+        lambda: line.expect("re"),
+        lambda: line.expect(""),
+    ], "Expected arrow name")


 def parse_arrow_head(line: Line) -> ArrowHead:
-    return line.one_of(
-        [
-            lambda: line.expect_with(">>", ArrowHead.SEQUENCE),
-            lambda: line.expect_with(">", ArrowHead.NORMAL),
-        ],
-        "Expected arrow head",
-    )
+    return line.one_of([
+        lambda: line.expect_with(">>", ArrowHead.SEQUENCE),
+        lambda: line.expect_with(">", ArrowHead.NORMAL),
+    ], "Expected arrow head")


 def parse_eol(line: Line) -> None:
@@ -417,12 +409,12 @@ class Transformer:

    def transform(self, path: PurePath) -> Optional[PurePath]:
        for i, (line, tf) in enumerate(self._tfs):
-            log.explain(f"Testing rule {i + 1}: {line}")
+            log.explain(f"Testing rule {i+1}: {line}")

            try:
                result = tf.transform(path)
            except Exception as e:
-                log.warn(f"Error while testing rule {i + 1}: {line}")
+                log.warn(f"Error while testing rule {i+1}: {line}")
                log.warn_contd(str(e))
                continue

--- a/PFERD/utils.py
+++ b/PFERD/utils.py
@@ -3,11 +3,10 @@ import getpass
 import sys
 import threading
 from abc import ABC, abstractmethod
-from collections.abc import Callable
 from contextlib import AsyncExitStack
 from pathlib import Path, PurePath
 from types import TracebackType
-from typing import Any, Generic, Optional, TypeVar
+from typing import Any, Callable, Dict, Generic, Optional, Type, TypeVar
 from urllib.parse import parse_qs, urlencode, urlsplit, urlunsplit

 import bs4
@@ -80,7 +79,7 @@ def url_set_query_param(url: str, param: str, value: str) -> str:
    return urlunsplit((scheme, netloc, path, new_query_string, fragment))


-def url_set_query_params(url: str, params: dict[str, str]) -> str:
+def url_set_query_params(url: str, params: Dict[str, str]) -> str:
    """
    Sets multiple query parameters in an url, overwriting existing ones.
    """
@@ -125,17 +124,17 @@ class ReusableAsyncContextManager(ABC, Generic[T]):
        # See https://stackoverflow.com/a/13075071
        try:
            result: T = await self._on_aenter()
-            return result
-        except:
+        except:  # noqa: E722 do not use bare 'except'
            if not await self.__aexit__(*sys.exc_info()):
                raise
-            raise
+
+        return result

    async def __aexit__(
-        self,
-        exc_type: Optional[type[BaseException]],
-        exc_value: Optional[BaseException],
-        traceback: Optional[TracebackType],
+            self,
+            exc_type: Optional[Type[BaseException]],
+            exc_value: Optional[BaseException],
+            traceback: Optional[TracebackType],
    ) -> Optional[bool]:
        if not self._active:
            raise RuntimeError("__aexit__ called too many times")
--- a/PFERD/version.py
+++ b/PFERD/version.py
@@ -1,2 +1,2 @@
 NAME = "PFERD"
-VERSION = "3.8.3"
+VERSION = "3.5.0"
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ Binaries for Linux, Windows and Mac can be downloaded directly from the

 ### With pip

-Ensure you have at least Python 3.11 installed. Run the following command to
+Ensure you have at least Python 3.9 installed. Run the following command to
 install PFERD or upgrade it to the latest version:

 ```
@@ -56,17 +56,6 @@ Also, you can download most ILIAS pages directly like this:
 $ pferd kit-ilias-web <url> <output_directory>
 ```

-PFERD supports other ILIAS instances as well, using the `ilias-web` crawler (see
-the [config section on `ilias-web`](CONFIG.md#the-ilias-web-crawler) for more
-detail on the `base-url` and `client-id` parameters):
-
-```
-$ pferd ilias-web \
-    --base-url https://ilias.my-university.example \
-    --client-id My_University desktop \
-    <output_directory>
-```
-
 However, the CLI only lets you download a single thing at a time, and the
 resulting command can grow long quite quickly. Because of this, PFERD can also
 be used with a config file.
--- a/flake.lock
+++ b/flake.lock
@@ -2,16 +2,16 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1760725957,
-        "narHash": "sha256-tdoIhL/NlER290HfSjOkgi4jfmjeqmqrzgnmiMtGepE=",
+        "lastModified": 1694499547,
+        "narHash": "sha256-R7xMz1Iia6JthWRHDn36s/E248WB1/je62ovC/dUVKI=",
        "owner": "NixOS",
        "repo": "nixpkgs",
-        "rev": "81b927b14b7b3988334d5282ef9cba802e193fe1",
+        "rev": "e5f018cf150e29aac26c61dac0790ea023c46b24",
        "type": "github"
      },
      "original": {
        "owner": "NixOS",
-        "ref": "nixos-25.05",
+        "ref": "nixos-23.05",
        "repo": "nixpkgs",
        "type": "github"
      }
--- a/flake.nix
+++ b/flake.nix
@@ -2,7 +2,7 @@
  description = "Tool for downloading course-related files from ILIAS";

  inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
  };

  outputs = { self, nixpkgs }:
--- a/mypy.ini
+++ b/mypy.ini
@@ -0,0 +1,11 @@
+[mypy]
+disallow_any_generics = True
+disallow_untyped_defs = True
+disallow_incomplete_defs = True
+no_implicit_optional = True
+warn_unused_ignores = True
+warn_unreachable = True
+show_error_context = True
+
+[mypy-rich.*,bs4,keyring]
+ignore_missing_imports = True
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,52 +1,3 @@
 [build-system]
 requires = ["setuptools", "wheel"]
 build-backend = "setuptools.build_meta"
-
-[project]
-name = "PFERD"
-dependencies = [
-  "aiohttp>=3.8.1",
-  "beautifulsoup4>=4.10.0",
-  "rich>=11.0.0",
-  "keyring>=23.5.0",
-  "certifi>=2021.10.8"
-]
-dynamic = ["version"]
-requires-python = ">=3.11"
-
-[project.scripts]
-pferd = "PFERD.__main__:main"
-
-[tool.setuptools.dynamic]
-version = {attr = "PFERD.version.VERSION"}
-
-[tool.ruff]
-line-length = 110
-
-[tool.ruff.lint]
-select = [
-    # pycodestyle
-    "E",
-    # Pyflakes
-    "F",
-    # pyupgrade
-    "UP",
-    # flake8-bugbear
-    "B",
-    # flake8-simplify
-    "SIM",
-    # isort
-    "I",
-]
-ignore = [
-  "UP045",
-  "SIM114",
-  "B023"
-]
-
-[dependency-groups]
-dev = [
-    "pyinstaller>=6.16.0",
-    "pyright>=1.1.406",
-    "ruff>=0.14.1",
-]
--- a/scripts/build
+++ b/scripts/build
@@ -2,4 +2,4 @@

 set -e

-uv run pyinstaller --onefile pferd.py
+pyinstaller --onefile pferd.py
--- a/scripts/bump-version
+++ b/scripts/bump-version
@@ -1,8 +1,8 @@
 #!/usr/bin/env python3

 import argparse
-import re
 import time
+import re
 from subprocess import run


--- a/scripts/check
+++ b/scripts/check
@@ -2,5 +2,5 @@

 set -e

-uv run pyright .
-uv run ruff check
+mypy PFERD
+flake8 PFERD
--- a/scripts/format
+++ b/scripts/format
@@ -2,4 +2,5 @@

 set -e

-uv run ruff format
+autopep8 --recursive --in-place PFERD
+isort PFERD
--- a/scripts/setup
+++ b/scripts/setup
@@ -13,5 +13,5 @@ pip install --upgrade setuptools
 pip install --editable .

 # Installing tools and type hints
-pip install --upgrade mypy flake8 flake8-pyproject autopep8 isort pyinstaller
+pip install --upgrade mypy flake8 autopep8 isort pyinstaller
 pip install --upgrade types-chardet types-certifi
--- a/setup.cfg
+++ b/setup.cfg
@@ -0,0 +1,23 @@
+[metadata]
+name = PFERD
+version = attr: PFERD.version.VERSION
+
+[options]
+packages = find:
+python_requires = >=3.9
+install_requires =
+  aiohttp>=3.8.1
+  beautifulsoup4>=4.10.0
+  rich>=11.0.0
+  keyring>=23.5.0
+  certifi>=2021.10.8
+
+[options.entry_points]
+console_scripts =
+  pferd = PFERD.__main__:main
+
+[flake8]
+max_line_length = 110
+
+[isort]
+line_length = 110
--- a/uv.lock
+++ b/uv.lock