#compdef psql pg_dump pg_dumpall pg_restore createdb dropdb vacuumdb createuser dropuser initdb
# ------------------------------------------------------------------------------
# Copyright (c) 2016 Github zsh-users - http://github.com/zsh-users, Dominic Mitchell, Johann 'Myrkraverk' Oskarsson, Daniel Serodio, J Smith
# All rights reserved.
#
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# modification, are permitted provided that the following conditions are met:
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
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#       derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL ZSH-USERS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# ------------------------------------------------------------------------------
# Description
# -----------
#
#  Completion script for PostgreSQL utils (http://postgresql.org).
#
#  Source: http://www.zsh.org/mla/users/2004/msg01006.html
#
# ------------------------------------------------------------------------------
# Authors
# -------
#
#  * Dominic Mitchell <dom+zsh@happygiraffe.net>
#
#  * Johann 'Myrkraverk' Oskarsson <johann@2ndquadrant.com>
#
#  * Daniel Serodio <dserodio@gmail.com> pg_dumpall completion
#
#  * J Smith <dark.panda@gmail.com> pg_restore completion
#
# ------------------------------------------------------------------------------


_pgsql_get_identity () {
    _pgsql_user=${(v)opt_args[(i)-U|--username]}
    _pgsql_port=${(v)opt_args[(i)-p|--port]}
    _pgsql_host=${(v)opt_args[(i)-h|--host]}

    _pgsql_params=(
        ${_pgsql_user:+"--username=$_pgsql_user"}
        ${_pgsql_port:+"--port=$_pgsql_port"}
        ${_pgsql_host:+"--host=$_pgsql_host"}
    )
}

# Postgres Allows specifying the path to the directory containing the
# socket as well as a hostname.
_pgsql_host_or_dir() {
    _alternative \
        'hosts:host:_hosts' \
        'directories:directory:_directories'
}

# This creates a port completion list based on socket files on the
# local computer.  Be default, Postgres puts them in /tmp/ but Debian
# changed that to /var/run/postgresql/ in their packages.
_pgsql_ports() {
    compadd "$@" - /tmp/.s.PGSQL.<->(N:e) /var/run/postgresql/.s.PGSQL.<->(N:e)
}

_pgsql_users () {
    local _pgsql_user _pgsql_port _pgsql_host _pgsql_params
    local _pgsql_user_sql
    _pgsql_get_identity

    # We use _pgsql_port and _pgsql_host directly here instead of
    # _pgsql_params so as to not pick up a partially completed
    # username.
    _pgsql_params=(
        ${_pgsql_port:+"--port=$_pgsql_port"}
        ${_pgsql_host:+"--host=$_pgsql_host"}
    )

    _pgsql_user_sql='select r.rolname from pg_catalog.pg_roles r where r.rolcanlogin = true'

    compadd "$@" - $( psql $_pgsql_params[@] -Aqt -c $_pgsql_user_sql template1 2>/dev/null )

}

_pgsql_tables () {
    local _pgsql_user _pgsql_port _pgsql_host _pgsql_params
    _pgsql_get_identity

    # Need to pull out the database name from the existing arguments.
    # This is going to vary between commands.  Thankfully, it's only
    # used by pg_dump, which always has the dbname in arg1.  If it's
    # not present it defaults to ${PGDATABASE:-$LOGNAME}, which
    # matches (I think) the PostgreSQL behaviour.

    local db
    db=${line[1]:-${PGDATABASE:-$LOGNAME}}

    ## Instead of parsing the output of the psql \ commands, we look
    ## up the tables ourselves.  The following query has been tested
    ## with Postgres 8.2 - 9.2.

    local _pgsql_table_sql
    _pgsql_table_sql="select n.nspname || '.' || c.relname \
	from pg_catalog.pg_class c \
		left join pg_catalog.pg_namespace n on n.oid = c.relnamespace \
	where c.relkind in ('r', '') \
		and n.nspname <> 'pg_catalog' \
		and n.nspname <> 'information_schema' \
		and n.nspname !~ '^pg_toast' \
		and pg_catalog.pg_table_is_visible( c.oid ) \
	order by 1"

    compadd "$@" - \
        $( psql $_pgsql_params[@] -Aqt -c $_pgsql_table_sql $db 2>/dev/null )
}

_pgsql_schemas () {
    local _pgsql_user _pgsql_port _pgsql_host _pgsql_params
    _pgsql_get_identity

    local db
    db=${line[1]:-${PGDATABASE:-$LOGNAME}}

    local _pgsql_schema_sql="select n.nspname \
        from pg_catalog.pg_namespace n \
        where n.nspname !~ '^pg_' \
            and n.nspname <> 'information_schema' \
        order by 1;"

    compadd "$@" - \
        $( psql $_pgsql_params[@] -Aqt -c $_pgsql_schema_sql $db 2>/dev/null )
}

_pgsql_databases () {
    local _pgsql_user _pgsql_port _pgsql_host _pgsql_params
    _pgsql_get_identity

    local _pgsql_services _pgsql_service_files
    _pgsql_service_files=(
      ~/.pg_service.conf
      $(pg_config --sysconfdir)/pg_service.conf
    )
    _pgsql_services=$( grep -h '^\[.*\]' $_pgsql_service_files 2>/dev/null \
                         | sed -e 's/^\[/service=/' -e 's/\].*$//' )

    local _pgsql_db_sql
    _pgsql_db_sql="select d.datname from pg_catalog.pg_database d \
	where d.datname <> 'template0'"

    compadd "$@" - \
            ${(f)_pgsql_services} \
            $( psql $_pgsql_params[@] -Atq -c $_pgsql_db_sql template1 2>/dev/null )
}

_pgsql_encodings () {
    local _pgsql_user
    _pgsql_get_identity

    local _pgsql_db_sql
    _pgsql_db_sql="select pg_encoding_to_char(i) from generate_series(0,100) i;"

    compadd "$@" - $( psql $_pgsql_params[@] -Atq -c $_pgsql_db_sql template1  )
}


##
## The actual completion code for the commands
##

_psql () {
    local curcontext="$curcontext" state line expl
    typeset -A opt_args

    _arguments -C -s "-*" \
        "$_pgsql_common_opts[@]" \
        {-V,--version}'[display client version]' \
        {-a,--echo-all}'[print commands read]' \
        {-A,--no-align}'[unaligned output mode]' \
        {-c+,--command=}':execute SQL command:' \
        {-d+,--dbname=}':database to connect to:_pgsql_databases' \
        {-e,--echo-queries}'[display queries submitted]' \
        {-E,--echo-hidden}'[display hidden queries]' \
        {-f+,--file=}':SQL file to read:_files' \
        {-F+,--field-separator=}':field separator char:' \
        {-H,--html}'[HTML output]' \
        {-l,--list}'[list databases]' \
        {-o+,--output=}':query output:_files' \
        {-P+,--pset=}':set psql variable:' \
        {-q,--quiet}'[non verbose mode]' \
        {-R+,--record-separator=}':record separator char:' \
        {-s,--single-step}'[prompt before each query]' \
        {-S,--single-line}'[newline sends query]' \
        {-t,--tuples-only}'[dont display header/footer]' \
        {-T+,--table-attr=}':HTML table options:' \
        -u'[prompt for username/password]' \
        {-v+,--set=,--variable=}':set SQL variable:' \
        {-x,--expanded}'[one column per line]' \
        {-X,--no-psqlrc}'[dont read ~/.psqlrc]' \
        ':PostgreSQL database:_pgsql_databases' \
        ':PostgreSQL user:_pgsql_users'
}

_pg_dump () {
    local curcontext="$curcontext" state line expl
    typeset -A opt_args

    _arguments -C -s \
        "$_pgsql_common_opts[@]" \
        {-a,--data-only}'[dump only data]' \
        {-b,--blobs}'[dump blobs as well]' \
        {-c,--clean}'[include clean cmds in dump]' \
        {-C,--create}'[include createdb cmds in dump]' \
        {-E+,--encoding=}':database encoding:_pgsql_encodings' \
        {-d,--inserts}'[use INSERT not COPY]' \
        {-D,--{attribute,column}-inserts}'[use INSERT (cols) not COPY]' \
        {-f+,--file=}':output file:_files' \
        {-F+,--format=}':output format:_values "format" "p[plain text]" "t[tar]" "c[custom]"' \
        {-i,--ignore-version}'[ignore version mismatch]' \
        {-n+,--schema=}':schema to dump:_pgsql_schemas' \
        {-N+,--exclude-schema=}':schema to NOT dump:_pgsql_schemas' \
        {-o,--oids}'[dump objects identifiers for every table]' \
        {-O,--no-owner}'[dont recreate as same owner]' \
        {-R,--no-reconnect}'[dont output connect]' \
        {-s,--schema-only}'[no data, only schema]' \
        {-S+,--superuser=}':superuser name:_pgsql_users' \
        {-t+,--table=}':table to dump:_pgsql_tables' \
        {-T+,--exclude-table=}':table to NOT dump:_pgsql_tables' \
        {-v,--verbose}'[verbose mode]' \
        {-V,--version}'[display client version]' \
        {-x,--no-{acl,privileges}}'[dont dump ACLs]' \
        -X+':option:_values "option" use-set-session-authorization disable-triggers' \
        {-Z+,--compress=}':compression level:_values "level" 9 8 7 6 5 4 3 2 1 0' \
        ':PostgreSQL database:_pgsql_databases' \
        --section=':dump named section:_values "section" pre-data data post-data' \
        --disable-dollar-quoting'[disable dollar quoting, use SQL standard quoting]' \
        --disable-triggers'[disable triggers during data-only restore]' \
        --no-security-labels'[do not dump security label assignments]' \
        --no-tablespaces'[do not dump tablespace assignments]' \
        --no-unlogged-table-data'[do not dump unlogged table data]' \
        --quote-all-identifiers'[quote all identifiers, even if not key words]' \
        --serializable-deferrable'[wait until the dump can run without anomalies]' \
        --use-set-session-authorization'[use SET SESSION AUTHORIZATION commands instead of ALTER OWNER]'
}

_pg_restore () {
    local curcontext="$curcontext" state line expl
    typeset -A opt_args

    _arguments -C -s \
        "$_pgsql_common_opts[@]" \
        {-d+,--dbname=}':database to connect to:_pgsql_databases' \
        {-f+,--file=}':output file:_files' \
        {-F+,--format=}':output format:_values "format" "p[plain text]" "t[tar]" "c[custom]"' \
        {-l,--list}'[list databases]' \
        {-a,--data-only}'[dump only data]' \
        {-c,--clean}'[include clean (drop) cmds before recreating]' \
        {-C,--create}'[include createdb cmds in dump]' \
        {-e,--exit-on-error}'[exit on error, default is to continue]' \
        {-I,--index=}':index name:' \
        {-j,--jobs=}':use this many parallel jobs to restore:' \
        {-L,--use-list=}':use table of contents from this file for selecting/ordering output:' \
        {-n,--schema=}':restore only objects in this schema:' \
        {-O,--no-owner}'[skip restoration of object ownership]' \
        {-P,--function=}':restore named function:' \
        {-s,--schema-only}'[restore only the schema, no data]' \
        {-S,--superuser=}':superuser user name to use for disabling triggers:' \
        {-t,--table=}':restore named table:' \
        {-T,--trigger=}':restore named trigger:' \
        {-x,--no-privileges}'[skip restoration of access privileges (grant/revoke)]' \
        {-1,--single-transaction}'[restore as a single transaction]' \
        {-v,--verbose}'[verbose mode]' \
        {-V,--version}'[display client version]' \
        --disable-triggers'[disable triggers during data-only restore]' \
        --if-exists'[use IF EXISTS when dropping objects]' \
        --no-data-for-failed-tables'[do not restore data of tables that could not be created]' \
        --no-security-labels'[do not restore security labels]' \
        --no-tablespaces'[do not restore tablespace assignments]' \
        --section=':dump named section:_values "section" pre-data data post-data' \
        --use-set-session-authorization'[use SET SESSION AUTHORIZATION commands instead of ALTER OWNER commands to set ownership]'
}

_pg_dumpall () {
    local curcontext="$curcontext" state line expl
    typeset -A opt_args

    _arguments -C -s \
        "$_pgsql_common_opts[@]" \
        {-a,--data-only}'[dump only data]' \
        {-c,--clean}'[include clean (drop) cmds before recreating]' \
        {-g,--globals-only}'[dump only global objects, no databases]' \
        {-f+,--file=}':output file:_files' \
        {-o,--oids}'[dump objects identifiers for every table]' \
        {-O,--no-owner}'[dont recreate as same owner]' \
        {-r,--roles-only}'[no databases or tablespaces, only roles]' \
        {-s,--schema-only}'[no data, only schema]' \
        {-S+,--superuser=}':superuser name:_pgsql_users' \
        {-t,--tablespaces-only}'[no databases or roles, only tablespaces]' \
        {-x,--no-privileges}'[dont dump ACLs]' \
        --binary-upgrade'[for use by upgrade utilities only]' \
        --column-inserts'[use INSERT with column names not COPY]' \
        --disable-dollar-quoting'[disable dollar quoting, use SQL standard quoting]' \
        --disable-triggers'[disable triggers during data-only restore]' \
        --inserts'[use INSERT not COPY]' \
        --no-security-labels'[do not dump security label assignments]' \
        --no-tablespaces'[do not dump tablespace assignments]' \
        --no-unlogged-table-data'[do not dump unlogged table data]' \
        --quote-all-identifiers'[quote all identifiers, even if not key words]' \
        --use-set-session-authorization'[use SET SESSION AUTHORIZATION cmds instead of ALTER OWNER]'
}

_createdb () {
    local curcontext="$curcontext" state line expl
    typeset -A opt_args

    _arguments -C -s \
        "$_pgsql_common_opts[@]" \
        {-e,--echo}'[display SQL queries]' \
        {-q,--quiet}'[non verbose mode]' \
        {-D+,--location=}':database location:_directories' \
        {-T+,--template=}':database template:_pgsql_databases' \
        {-E+,--encoding=}':database encoding:_pgsql_encodings' \
        ':PostgreSQL database:' \
        ':comment:'
}

_dropdb () {
    local curcontext="$curcontext" state line expl
    typeset -A opt_args

    _arguments -C -s \
        "$_pgsql_common_opts[@]" \
        {-e,--echo}'[display SQL queries]' \
        {-q,--quiet}'[non verbose mode]' \
        {-i,--interactive}'[confirm before drop]' \
        ':PostgreSQL database:_pgsql_databases'
}

_vacuumdb () {
    local curcontext="$curcontext" state line expl
    typeset -A opt_args

    _arguments -C -s \
        "$_pgsql_common_opts[@]" \
        {-a,--all}'[vacuum all databases]' \
        {-d+,--dbname=}':database to connect to:_pgsql_databases' \
        {-t+,--table=}':table to dump:_pgsql_tables' \
        {-f,--full}'[do full vacuuming]' \
        {-z,--analyze}'[update optimizer hints]' \
        {-e,--echo}'[show the commands being sent to the server]' \
        {-q,--quiet}'[do not write any messages]' \
        {-v,--verbose}'[write a lot of output]' \
        '--help[show this help, then exit]' \
        '--version[output version information, then exit]' \
        '1:PostgreSQL database:_pgsql_databases'
}

_createuser () {
    local curcontext="$curcontext" state line expl
    typeset -A opt_args

    _arguments -C -s \
        "$_pgsql_common_opts[@]" \
        {-e,--echo}'[display SQL queries]' \
        {-c,--connection-limit=}'[connection limit for role (default: no limit)]' \
        {-d,--createdb}'[role can create new databases]' \
        {-D,--no-createdb}'[role cannot create databases]' \
        {-E,--encrypted}'[encrypt stored password]' \
        {-i,--inherit}'[role inherits privileges of roles it is a member of (default)]' \
        {-I,--no-inherit}'[role does not inherit privileges]' \
        {-l,--login}'[role can login (default)]' \
        {-L,--no-login}'[role cannot login]' \
        {-N,--unencrypted}'[do not encrypt stored password]' \
        {-P,--pwprompt}'[assign a password to new role]' \
        {-r,--createrole}'[role can create new roles]' \
        {-R,--no-createrole}'[role cannot create roles]' \
        {-s,--superuser}'[role will be superuser]' \
        {-S,--no-superuser}'[role will not be superuser]'
}

_dropuser () {
    local curcontext="$curcontext" state line expl
    typeset -A opt_args

    _arguments -C -s \
        "$_pgsql_common_opts[@]" \
        {-e,--echo}'[display SQL queries]' \
        {-q,--quiet}'[non verbose mode]' \
        {-i,--interactive}'[confirm before drop]' \
        ':PostgreSQL user:_pgsql_users'
}

_initdb () {
    local curcontext="$curcontext" state line expl
    typeset -A opt_args

    _arguments -C -s \
        {--auth=,-A+}':default authentication method for local connections:_values "auth methods" $_pgsql_auth_methods[@]' \
        {-D+,--pgdata=}':location for this database cluster:_files' \
        {-E+,--encoding=}':set default encoding for new databases:' \
        --locale=':set default locale for new databases:' \
        --lc-collate=':set the default locale for collate:' \
        --lc-ctype=':set the default locale for ctype:' \
        --lc-messages=':set the default locale for messages:' \
        --lc-monetary=':set the default locale for monetary:' \
        --lc-numeric=':set the default locale for numeric:' \
        --lc-time=':set the default local for time:' \
        --no-locale'[equivalent to --locale=C]' \
        --pwfile=':read password for the new superuser from file:_files' \
        {-T+,--text-search-config=}'[default text search configuration]' \
        {-U+,--username=NAME}':database superuser name:' \
        {-W,--pwprompt}'[prompt for a password for the new superuser]' \
        {-X+,--xlogdir=}':location for the transaction log directory:_files' \
        {-d,--debug}'[generate lots of debugging output]' \
        -L+':where to find the input files:_files' \
        {-n,--noclean}'[do not clean up after errors]' \
        {-s,--show}'[show internal settings]' \
        ':location for this database cluster:_files'
}

_pgsql_utils () {
    local _pgsql_common_opts _pgsql_auth_methods

    _pgsql_common_opts=(
        {-\?,--help}'[display help]'
        {-h+,--host=}':database host:_pgsql_host_or_dir'
        {-p+,--port=}':database port number:_pgsql_ports'
        {-U+,--username=}':connect as user:_pgsql_users'
        {-W,--password}'[prompt for password]'
    )

    _pgsql_auth_methods=(
        trust
        reject
        md5
        password
        gss
        sspi
        krb5
        ident
        peer
        ldap
        radius
        cert
        pam
    )

    case "$service" in
        psql)     _psql "$@"     ;;
        pg_dump)  _pg_dump "$@"  ;;
        pg_restore)  _pg_restore "$@" ;;
        createdb) _createdb "$@" ;;
        dropdb)   _dropdb "$@"   ;;
        vacuumdb) _vacuumdb "$@"   ;;
        createuser) _createuser "$@" ;;
        dropuser) _dropuser "$@" ;;
        initdb) _initdb "$@"     ;;
    esac
}

_pgsql_utils "$@"

# Local Variables:
# mode: Shell-Script
# sh-indentation: 2
# indent-tabs-mode: nil
# sh-basic-offset: 2
# End:
# vim: ft=zsh sw=2 ts=2 et
