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#!/bin/sh
set -e

data_dir="${XDG_DATA_HOME:-$HOME/.local/share}/unicode"
menu="wmenu"

note()
{
	: "${1:?}"

	command -v notify-send > /dev/null &&
		notify-send "  dunicode" "$1"
}

die()
{
	: "${1:?}"

	note "$1"
	printf "\033[31;1merr: %b\033[0m\n" "$1" 1>&2
	exit "${2:-1}"
}

dep_check()
{
	: "${1:?}"

	for dep; do
		command -v "$dep" 1>/dev/null ||
			die "$dep not found, please install it" 127
	done

	unset dep
}

get_glyph()
{

	str=

	for glyph in "$data_dir"/*
	do
		[ -s "$glyph" ] &&
			str="${str}${glyph##*/}\n"
	done

	[ -z "$str" ] &&
		die "no glyphs available, put them in $data_dir"

	# shellcheck disable=SC2059
	[ -n "${str#*\n}" ] &&
		str="$(printf "$str" | "$menu" -p " ")"

	str="$("$menu" -l 25 -p " " < "${data_dir}/${str}")"
	echo "${str%%[[:space:]]*}"

	unset str
}

main()
{

	[ -z "$WAYLAND_DISPLAY" ] &&
		menu="dmenu"

	case "$1" in
	-h)
		printf "usage: %s %s" "${0##*/}" "[-ct]"
		;;
	-c)
		glyph="$(get_glyph)"

		if [ -z "$WAYLAND_DISPLAY" ]
		then
			dep_check "xclip"
			printf "%s" "$glyph" | xclip -selection clipboard
		else
			dep_check "wl-copy"
			printf "%s" "$glyph" | wl-copy
		fi &&
			note "$glyph coppied to clipboard"
		;;
	-t|"")
		glyph="$(get_glyph)"

		if [ -z "$WAYLAND_DISPLAY" ]
		then
			dep_check "xdotool"
			xdotool type --delay 20 "$glyph"
		else
			dep_check "wtype"
			wtype -d 20 "$glyph"
		fi
		;;
	*)
		die "invalid usage: ${0##*/} $*"
		;;
	esac
}

main "$@"