thumbnailer

#!/usr/bin/env bash

set -e
userdirs="${XDG_CONFIG_HOME:-$HOME/.config}/user-dirs.dirs" 
[ -f "$userdirs" ] && source "$userdirs"

cachedir="${XDG_CACHE_DIR:-$HOME/.cache}/thumbnails"
file="$(realpath "$1")"
mime="$(file -Lb --mime-type "$file")"
thumbfile="$(echo "$file" | md5sum | awk '{print $1}').png"
thumbpath="$cachedir/$thumbfile"

if [ -f "$thumbpath" ]; then
	if [ "$(stat -c "%Y" "$thumbpath")" -gt "$(stat -c "%Y" "$file")" ]; then
		echo "$thumbpath"
		exit 0
	fi
fi

case $mime in
	video/*) ffmpegthumbnailer -i "$file" -o "$thumbpath" -s 0 ;;
	image/svg*) 
		rsvg-convert --keep-aspect-ratio --width 768 "$file" -o "$thumbpath" 
		;;
	image/*) 
		# check if image size is bigger then 1MiB
		if [[ "$(stat -c %s "$file")" -gt 1000000 ]]; then
			magick "$file" -thumbnail 720 "$thumbpath"
		else
			echo "$file"
			exit 0
		fi
		;;
	*/pdf) 
		pdftoppm -png -f 1 -r 100 -singlefile "$file" "${thumbpath%.png}" || \
			gs -q -sDEVICE=png256 -dFirstPage=1 -dLastPage=1 -dNOPAUSE \
			-dBATCH -o "$thumbpath" -r100 "$file"
		;;
	audio/*)
		defaultthumb="$cachedir/music.png"
		ffmpeg -y -i "$file" -an -vf "crop=ih:ih,scale=360:360" "$thumbpath" >/dev/null 2>&1
		if [ $? -ne 0 ]; then
			if [ ! -e "$defaultthumb" ]; then
				rsvg-convert --width=360 --output="$defaultthumb" \
					"${XDG_CONFIG_HOME:-$HOME/.config}/eww/images/music.svg"
			fi
			echo "$defaultthumb"
			exit 0
		fi
		;;
	application/zip) 
		thumbInZip=$(7z l "$file" | awk '/thumbnail/{print $6}' | head -1)
		[ -n "$thumbInZip" ] || exit 1
		tempdir=$(mktemp -d)
		7z e "$file" "$thumbInZip" -o"$tempdir" > /dev/null
		mv "$tempdir/${thumbInZip##*/}" "$thumbpath"
		rm -rf "$tempdir"
		;;
	*) exit 1 ;;
esac

echo "$thumbpath"