#!/bin/bash
#
# list_installed_launchjob_ids
#

###
### settings
###

set -e                # exit on any uncaught error
set +o histexpand     # don't expand history expressions
shopt -s nocasematch  # case-insensitive regular expressions

###
### global variables
###

# prefer GNU xargs
xargs="$(/usr/bin/which gxargs || printf '/usr/bin/xargs')"

###
### functions
###

launchjob_id_source_1 () {
    /usr/bin/find ~/Library/LaunchAgents/          \
                  ~/Library/LaunchDaemons/         \
                  /Library/LaunchAgents/           \
                  /Library/LaunchDaemons/          \
                  -type f -print0 2>/dev/null |    \
    "$xargs" -0 /usr/bin/perl -0777 -ne            \
      'while (m{<key>\s*Label\s*</key>\s*<string>([^<]+?)</string>}sg) { print "$1\n" }'
}

merge_sources () {
    /usr/bin/sort | /usr/bin/uniq
}

clean_sources () {
    /usr/bin/egrep -v '^com\.apple\.'
}

mark_up_sources () {
    /usr/bin/perl -pe 's{\n}{\000}sg' |                                                \
    "$xargs" -0 -I{} -n1 /bin/bash -c                                                  \
      'printf "{}"; /bin/launchctl list "{}" >/dev/null 2>&1 && printf " (+)"; printf "\n"'
}

###
### main
###

_list_installed_launchjob_ids () {

    {
      launchjob_id_source_1;
    } |                     \
    merge_sources |         \
    clean_sources |         \
    mark_up_sources

}

# process args
if [[ $1 =~ ^-+h(elp)?$ ]]; then
    printf "list_installed_launchjob_ids

List all installed launchjob IDs, which may be useful
in a Cask uninstall stanza, eg

    uninstall launchctl: 'job.id.goes.here'

Launchctl jobs attributed to Apple will be ommitted.

If a launchctl job is currently loaded, and visible to the current
user, it will be followed by a plus symbol '(+)' in the output.
This can be verified via the command

    /bin/launchctl list 'job.id.goes.here'

See CONTRIBUTING.md and 'man launchctl' for more information.

"
    exit
fi

# dispatch main
_list_installed_launchjob_ids "${@}"

#