# Completions for the `apt` command

function __fish_apt_no_subcommand --description 'Test if apt has yet to be given the subcommand'
	for i in (commandline -opc)
		if contains -- $i update upgrade full-upgrade search list install show remove edit-sources purge changelog autoremove
			return 1
		end
	end
	return 0
end

function __fish_apt_use_package --description 'Test if apt command should have packages as potential completion'
	for i in (commandline -opc)
		if contains -- $i install remove upgrade full-upgrade show search purge changelog
			return 0
		end
	end
	return 1
end

function __fish_apt_subcommand
    set subcommand $argv[1]
    set -e argv[1]
    complete -f -c apt -n '__fish_apt_no_subcommand' -a $subcommand $argv
end

function __fish_apt_using_subcommand --description 'Test if given subcommand is used'
    for i in (commandline -opc)
        if contains -- $i $argv
            return 0
        end
    end
    return 1
end

function __fish_apt_option
    set subcommand $argv[1]
    set -e argv[1]
    complete -f -c apt -n "__fish_apt_using_subcommand $subcommand" $argv
end

complete -c apt -n '__fish_apt_use_package' -a '(__fish_print_packages)' --description 'Package'

# Support flags
complete -x -f -c apt -s h -l help     --description 'Display help'
complete -x -f -c apt -s v -l version  --description 'Display version and exit'

# General options
complete -f -c apt -s o -l option       --description 'Set a configuration option'
complete -f -c apt -s c -l config-file  --description 'Configuration file'
complete -f -c apt -s t                 --description 'Target release'

# List
__fish_apt_subcommand list                  --description 'List packages'
__fish_apt_option     list -l installed     --description 'Installed packages'
__fish_apt_option     list -l upgradable    --description 'Upgradable packages'
__fish_apt_option     list -l all-versions  --description 'Show all versions of any package'

# Search
__fish_apt_subcommand search -r        --description 'Search for packages'

# Search
__fish_apt_subcommand show -r          --description 'Show package information'

# Install
__fish_apt_subcommand install -r       --description 'Install packages'

# Remove
__fish_apt_subcommand remove -r        --description 'Remove packages'

# Edit sources
__fish_apt_subcommand edit-sources     --description 'Edit sources list'

# Update
__fish_apt_subcommand update -x        --description 'Update package list'

# Upgrade
__fish_apt_subcommand upgrade -r       --description 'Upgrade packages'

# Full Upgrade
__fish_apt_subcommand full-upgrade -r  --description 'Upgrade packages, removing others when needed'

# Purge
__fish_apt_subcommand purge -x         --description 'Remove packages and delete their config files'

# Changelog
__fish_apt_subcommand changelog -r     --description 'Download and display package changelog'

# Autoremove
__fish_apt_subcommand autoremove       --description 'Remove packages no longer needed as dependencies'