#!/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 "$1" -copy all -outfile "$file" "$file" ;;
			*)           mogrify  -rotate "$1" "$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 "$1" -copy all -outfile "$file" "$file"
				;;
			*)	
				if [ "$1" = vertical ]; then
					mogrify -flip "$file"
				elif [ "$1" = horizontal ]; then
					mogrify -flop "$file"
				else
					exit 1
				fi
				;;
		esac
	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 '$file' | LESS='$LESS-+F' '$PAGER'" & done ;;
	"f") flip vertical ;;
	"F") flip horizontal ;;
	"g") tr '\n' '\0' | xargs -0 setsid -f gimp ;;
	"k") tr '\n' '\0' | xargs -0 setsid -f krita ;;
	# `-resize "1920x1080>"` shrink large image but don't resize small iamge to larger
	# https://stackoverflow.com/q/6384729
	# https://legacy.imagemagick.org/script/command-line-processing.php#geometry
	"p") tr '\n' '\0' | xargs -0 sh -c 'convert -resize "1920x1080>" -auto-orient "$@" -compress jpeg "$(time-uuid).pdf"' shell ;;
	# alternative using `xclip -in -selection clipboard`
	"y") tr '\n' '\0' | xargs -0 realpath | tr '\n' '\0' | xargs -0 printf '%q ' | xsel -ib ;;
	"comma") rotate 270 ;;
	"period") rotate 90 ;;
	"slash") rotate 180 ;;
esac