# Relational pipes
# Copyright © 2019 František Kučera (Frantovo.cz, GlobalCode.info)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.

_relpipe_in_filesystem_completion() {
	local w0 w1 w2

	COMPREPLY=()
	w0=${COMP_WORDS[COMP_CWORD]}
	w1=${COMP_WORDS[COMP_CWORD-1]}
	w2=${COMP_WORDS[COMP_CWORD-2]}


	FILE_FIELDS=(
		"path"
		"name"
		"size"
		"path_absolute"
		"path_canonical"
		"type"
		"symlink_target_type"
		"symlink_target"
		"owner"
		"group"
		"content"
	)

	XATTR_FIELDS=(
		"mime_type"
		"charset"
		"creator"
		"xdg.comment"
		"xdg.origin.url"
		"xdg.origin.email.subject"
		"xdg.language"
		"xdg.publisher"
		"dublincore.title"
		"dublincore.creator"
		"dublincore.rights"
	)

	if   [[ "$w1" == "--relation"      && "x$w0" == "x" ]];    then COMPREPLY=("''")
	elif [[ "$w1" == "--as"            && "x$w0" == "x" ]];    then COMPREPLY=("''")
	elif [[ "$w1" == "--option"        && "x$w0" == "x" ]];    then COMPREPLY=("''")
	elif [[ "$w2" == "--option"        && "x$w0" == "x" ]];    then COMPREPLY=("''")
	elif [[ "$w1" == "--parallel"      && "x$w0" == "x" ]];    then COMPREPLY=($(nproc --all))
	elif [[ "$w1" == "--file"                           ]];    then COMPREPLY=($(compgen -W "${FILE_FIELDS[*]}"  -- "$w0"))
	elif [[ "$w1" == "--xattr"                          ]];    then COMPREPLY=($(compgen -W "${XATTR_FIELDS[*]}" -- "$w0"))
	elif [[ "$w1" == "--streamlet"                      ]];    then COMPREPLY=($(while read c; do PATH="$RELPIPE_IN_FILESYSTEM_STREAMLET_PATH" type -P "$c" &>/dev/null && echo "$c"; done < <(PATH="$RELPIPE_IN_FILESYSTEM_STREAMLET_PATH" compgen -A command -- "$w0")))
	else
		OPTIONS=(
			"--relation"
			"--file"
			"--xattr"
			"--streamlet"
			"--as"
			"--option"
			"--parallel"
		)
		COMPREPLY=($(compgen -W "${OPTIONS[*]}" -- "$w0"))
	fi
}

complete -F _relpipe_in_filesystem_completion relpipe-in-filesystem
