$ git clone -q https://github.com/biox/pa.git
$ cd pa/contrib
$ ls -1 -p
pa-bemenu
pa-completion-new.bash
pa-completion.bash
pa-completion.fish
pa-dmenu
pa-fuzzel
pa-pass
pa-rekey
pa-rofi
pa-ssg
pa-urn
pa-wmenu
$ nl -b a -s ' ' -w 3 pa-completion-new.bash
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# requires bash-completion >= v2.12.0, preferably >= v2.17.0

_comp_cmd_pa() {
	local words cword
	_comp_initialize -- "$@" || return

	if [[ $cword -eq 1 ]]; then
		_comp_compgen_split "add del edit git list show"
		return
	fi

	local PA_DIR=${PA_DIR:-$HOME/.local/share/pa}
	[[ -d $PA_DIR/passwords ]] || return

	case ${words[1]} in
	[al]*)
		if [[ $cword -eq 2 ]]; then
			_comp_compgen -C "$PA_DIR/passwords" filedir -df
			local i
			for i in "${!COMPREPLY[@]}"; do
				if [[ ${COMPREPLY[i]} == .git/ ]]; then
					unset 'COMPREPLY[i]'
					break
				fi
			done
		fi
		;;
	[des]*)
		if [[ $cword -eq 2 ]]; then
			_comp_compgen_split -l "$(${words[0]} l 2>/dev/null)"
		fi
		;;
	g*)
		pushd "$PA_DIR/passwords" &>/dev/null || return
		if [[ ${words[1]} != git ]]; then
			COMP_LINE=${words[0]}\ git${COMP_LINE#*"${words[0]} ${words[1]}"}
			((COMP_POINT += 3 - ${#words[1]}))
			COMP_WORDS[1]=git
		fi
		_comp_command_offset 1
		popd &>/dev/null || return
		;;
	esac
}

complete -F _comp_cmd_pa pa