#!/bin/sh

# shclip, by yosh
# https://git.unix.dog/yosh/shclip

set -eu

# config file if exists
SHCLIP_CONFIG_DIR="${SHCLIP_CONFIG_DIR:-${XDG_CONFIG_HOME:-$HOME/.config}/shclip}"
. "$SHCLIP_CONFIG_DIR/config"

SHCLIP_MENU_MAIN_CMD=${SHCLIP_MENU_MAIN_CMD:-fzfmenu -p shclip}
SHCLIP_MENU_DEL_CMD=${SHCLIP_MENU_DEL_CMD:-${SHCLIP_MENU_MAIN_CMD}}
SHCLIP_MENU_COPY_CMD=${SHCLIP_MENU_COPY_CMD:-${SHCLIP_MENU_MAIN_CMD}}
SHCLIP_MENU_EDIT_CMD=${SHCLIP_MENU_EDIT_CMD:-${SHCLIP_MENU_MAIN_CMD}}
SHCLIP_TEXT_EDITOR=${SHCLIP_TEXT_EDITOR:-xdg-open}
SHCLIP_IMAGE_EDITOR=${SHCLIP_IMAGE_EDITOR:-gimp -n}

SHCLIP_TEMP_DIR="${XDG_RUNTIME_DIR:-${TMPDIR:-/tmp}}/shclip-$USER-$DISPLAY"

showmenu() {
	choice="$(printf 'copy\ndelete\nedit\nshclip toggle\nfilter toggle\nexit' | $SHCLIP_MENU_MAIN_CMD)"
	case $choice in
		delete) delmenu ;;
		copy) copymenu ;;
		edit) editmenu ;;
		shclip*) [ -d "$SHCLIP_TEMP_DIR/lock" ] && kill -s USR1 "$(cat "$SHCLIP_TEMP_DIR/pid")" ;;
		filter*) [ -d "$SHCLIP_TEMP_DIR/lock" ] && kill -s USR2 "$(cat "$SHCLIP_TEMP_DIR/pid")" ;;
		*) exit ;;
	esac
}

menu_gen() {
	while read -r ind; do
		file="$SHCLIP_TEMP_DIR/$ind"
		[ ! -f "$file" ] && continue

		# build menu
		mime="$(file -bi "$file")"
		if [ "${mime%%/*}" = "text" ]; then
			preview="${ind%%.*} | $(dd if="$file" bs=128 count=1 2>/dev/null | tr '\n' ' ')"
		else
			preview="${ind%%.*} * --- ${mime%%;*} --- $(du -k "$file" | cut -f 1)KiB"
		fi
		printf '%s\n' "${preview}"
	done < "$SHCLIP_TEMP_DIR/order"
}

delmenu() {
	choice="$({ echo "ALL"; menu_gen; } | $SHCLIP_MENU_DEL_CMD | cut -d ' ' -f 1)"
	case $choice in
		ALL)
			set +f
			rm -f "$SHCLIP_TEMP_DIR"/*.clip
			set -f
			;;
		[0-9]*) rm -f "$SHCLIP_TEMP_DIR/$choice.clip" ;;
		*) exit 1 ;;
	esac
}

copymenu() {
	choice="$(menu_gen | $SHCLIP_MENU_COPY_CMD | cut -d ' ' -f 1)"
	case $choice in
		[!0-9]*) exit 1 ;;
		*) ;;
	esac
	mime="$(file -bi "$SHCLIP_TEMP_DIR/$choice.clip")"

	ln="$(grep -n "$choice" "$SHCLIP_TEMP_DIR/order")"
	ed -s "$SHCLIP_TEMP_DIR/order" - <<-EOF
		${ln%%:*}m0
		wq
	EOF

	case $mime in
		text*) xclip -sel clipboard "$SHCLIP_TEMP_DIR/$choice.clip" ;;
		*) xclip -sel clipboard -t "${mime%%;*}" "$SHCLIP_TEMP_DIR/$choice.clip" ;;
	esac
	exit
}

editmenu() {
	choice="$(menu_gen | $SHCLIP_MENU_EDIT_CMD | cut -d ' ' -f 1)"
	case $choice in
		[!0-9]*) exit 1 ;;
		*) ;;
	esac
	mime="$(file -bi "$SHCLIP_TEMP_DIR/$choice.clip")"

	case $mime in
		image/*)
			mv "$SHCLIP_TEMP_DIR/$choice.clip" "$SHCLIP_TEMP_DIR/$choice.png"
			$SHCLIP_IMAGE_EDITOR "$SHCLIP_TEMP_DIR/$choice.png"
			mv "$SHCLIP_TEMP_DIR/$choice.png" "$SHCLIP_TEMP_DIR/$choice.clip"
			;;
		*) $SHCLIP_TEXT_EDITOR "$SHCLIP_TEMP_DIR/$choice.clip" ;;
	esac
	exit
}

while true; do
	showmenu
done