#!/bin/sh

# Example for $XDG_CONFIG_HOME/sxiv/exec/key-handler
# Called by sxiv(1) after the external prefix key (C-x by default) is pressed.
# The next key combo is passed as its first argument. Passed via stdin are the
# images to act upon, one path per line: all marked images, if in thumbnail
# mode and at least one image has been marked, otherwise the current image.
# sxiv(1) blocks until this script terminates. It then checks which images
# have been modified and reloads them.

# The key combo argument has the following form: "[C-][M-][S-]KEY",
# where C/M/S indicate Ctrl/Meta(Alt)/Shift modifier states and KEY is the X
# keysym as listed in /usr/include/X11/keysymdef.h without the "XK_" prefix.

# my dependency notes
# jpegtran is owned by libjpeg-turbo
# mogrify is owned by imagemagick
# exiv2 is owned by exiv2
# rawtherapee is owned by rawtherapee

rotate() {
	tr '\n' '\0' | xargs -0 realpath | sort | uniq | while read -r file; do
		case "$(file -b -i "$file")" in
			image/jpeg*) jpegtran -rotate 90 -copy all -outfile "$file" "$file" ;;
			*)           mogrify  -rotate 90 "$file" ;;
		esac
	done
}

flip() {
	tr '\n' '\0' | xargs -0 realpath | sort | uniq | while read -r file; do
		case "$(file -b -i "$file")" in
			image/jpeg*) jpegtran -flip vertical -copy all -outfile "$file" "$file" ;;
			*)           mogrify -flip "$file" ;;
		esac
	done
}

linkwall() {
	tr '\n' '\0' | xargs -0 realpath | sort | uniq | while read -r file; do
		walldir="$XDG_PICTURES_DIR/wallpapers/"
		name=$(basename "$file")
		if [ ! -e "$walldir$name" ]; then
			convwall "$file" "$walldir$name" || ln -s "$file" "$walldir" 
		else
			notify-send 'error' "$name exist"
		fi
	done
}

# I choose not to put case nested in while read file loop
# because it can pipe multiple files to one command?
case "$1" in
	"d") [ "$(printf 'No\nYes' | dmenu -i -p 'delete?')" = "Yes" ] && tr '\n' '\0' | xargs -0 rm ;;
	"e") while read -r file; do alacritty -e sh -c "exiv2 pr -q -pa '$file' | less" & done ;;
	"f") flip ;;
	"g") tr '\n' '\0' | xargs -0 setsid -f gimp ;;
	"l") linkwall ;;
	"p") tr '\n' '\0' | xargs -0 sh -c 'convert "$@" $(time.uuid).pdf' shell ;;
	"r") rotate ;;
	"w") tr '\n' '\0' | xargs -0 shufwall ;;
	# alternative using `xclip -in -selection clipboard`
	"y") tr '\n' '\0' | xargs -0 realpath | tr '\n' '\0' | xargs -0 printf '%q ' | xsel -ib ;;
esac