Configure code checking and formatting tools

Checking
- mypy
- flake8 (which uses pyflakes and pycodestyle)

Formatting
- autopep8
- isort

DEV.md

@@ -15,12 +15,14 @@ environment, run these commands in the same directory as this file:
 ```
 $ python -m venv .venv
 $ . .venv/bin/activate
-$ pip install --editable .
+$ ./scripts/setup
 ```
 
-After this, you can use PFERD as if it was installed normally. Since PFERD was
+The setup script installs a few required dependencies and tools. It also
-installed with `--editable`, there is no need to re-run `pip install` when the
+installs PFERD via `pip install --editable .`, which means that you can just run
-source code is changed.
+`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.
 
 For more details, see [this part of the Python Tutorial][venv-tut] and
 [this section on "development mode"][ppug-dev].
@@ -29,9 +31,22 @@ For more details, see [this part of the Python Tutorial][venv-tut] and
 [venv-tut]: <https://docs.python.org/3/tutorial/venv.html> "12. Virtual Environments and Packages"
 [ppug-dev]: <https://packaging.python.org/guides/distributing-packages-using-setuptools/#working-in-development-mode> "Working in “development mode”"
 
+## Checking and formatting the code
+
+To run a set of checks against the code, run `./scripts/check` in the repo's
+root directory. This script will run a few tools installed by `./scripts/setup`
+against the entire project.
+
+To format the code, run `./scripts/format` in the repo's root directory.
+
+Before committing changes, please make sure the checks return no warnings and
+the code is formatted.
+
 ## Contributing
 
 When submitting a PR that adds, changes or modifies a feature, please ensure
-that the corresponding documentation is updated.
+that the corresponding documentation is updated as well. Also, please ensure
+that `./scripts/check` returns no warnings and the code has been run through
+`./scripts/format`.
 
 In your first PR, please add your name to the `LICENSE` file.

scripts/check

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+mypy PFERD
+flake8 PFERD

scripts/format

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+autopep8 --recursive --in-place PFERD
+isort PFERD

scripts/setup

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+pip install --upgrade pip setuptools
+pip install --editable .
+pip install --upgrade mypy flake8 autopep8 isort

setup.cfg

@@ -15,8 +15,8 @@ install_requires =
 console_scripts =
   pferd = PFERD.__main__:main
 
-[pycodestyle]
+[flake8]
-max-line-length = 110
+max_line_length = 110
 
-[pylint.FORMAT]
+[isort]
-max-line-length = 110
+line_length = 110