dotfiles/.local/bin/lf-ueberzug-previewer

#!/usr/bin/env sh

preview() {
	cat <<-EOF | paste -sd '' >"$LF_UEBERZUG_FIFO"
	{
	"action": "add", "identifier": "lf-preview",
	"path": "$1", "x": $4, "y": $5, "width": $2, "height": $3,
	"scaler": "contain"
	}
	EOF
}

set -C -f -u
IFS=$'\n'

lf-ueberzug-cleaner # clean active preview

file="$1"; shift

# Settings
HIGHLIGHT_SIZE_MAX=262143  # 256KiB
HIGHLIGHT_TABWIDTH=8
HIGHLIGHT_STYLE='base16/oceanicnext'
PYGMENTIZE_STYLE='autumn'

case "$(basename "$file" | tr '[A-Z]' '[a-z]')" in
        # Archive
        *.a|*.ace|*.alz|*.arc|*.arj|*.bz|*.bz2|*.cab|*.cpio|*.deb|*.gz|*.jar|*.lha|*.lz|*.lzh|*.lzma|*.lzo|\
        *.rpm|*.rz|*.t7z|*.tar|*.tbz|*.tbz2|*.tgz|*.tlz|*.txz|*.t*.Z|*.tzo|*.war|*.xpi|*.xz|*.Z|*.zip)
            atool --list -- "$file"
            bsdtar --list --file "$file"
            exit 1;;
        *.rar)
            # Avoid password prompt by providing empty password
            unrar lt -p- -- "$file"
            exit 1;;
        *.7z)
            # Avoid password prompt by providing empty password
            7z l -p -- "$file"
            exit 1;;

        # BitTorrent
        *.torrent)
            transmission-show -- "$file"
            exit 1;;

        # OpenDocument
        *.odt|*.ods|*.odp|*.sxw)
            # Preview as text conversion
            odt2txt "$file"
            exit 1;;

        # HTML
        *.htm|*.html|*.xhtml)
            # Preview as text conversion
            w3m -dump "$file"
            lynx -dump -- "$file"
            elinks -dump "$file"
            exit 1;; # Continue with next handler on failure
				*.avi|*.mp4|*.mkv)
					thumbnail="$LF_UEBERZUG_TEMPDIR/thumbnail.png"
          ffmpegthumbnailer -i "$file" -o "$thumbnail" -s 0
					preview "$thumbnail" "$@"
					exit 127;;
				*.pdf)
					thumbnail="$LF_UEBERZUG_TEMPDIR/thumbnail.png"
					gs -o "$thumbnail" -sDEVICE=pngalpha -dLastPage=1 "$file" >/dev/null
					preview "$thumbnail" "$@"
					exit 127;;
				*.jpg|*.jpeg|*.png|*.bmp)
					preview "$file" "$@"
					exit 127;;
				*.svg)
					thumbnail="$LF_UEBERZUG_TEMPDIR/thumbnail.png"
					convert "$file" "$thumbnail"
					preview "$thumbnail" "$@"
					exit 127;;
esac

MIMETYPE="$( file --dereference --brief --mime-type -- "$file" )"

case "$MIMETYPE" in
		# Text

		text/plain)
			cat "$file"
			exit 127;;

		text/* | */xml)
				# Syntax highlight
				if [ "$( stat --printf='%s' -- "$file" )" -gt "$HIGHLIGHT_SIZE_MAX" ]; then
						exit 2
				fi
				if [ "$( tput colors )" -ge 256 ]; then
						pygmentize_format='terminal256'
						highlight_format='xterm256'
				else
						pygmentize_format='terminal'
						highlight_format='ansi'
				fi
				highlight --replace-tabs="$HIGHLIGHT_TABWIDTH" --out-format="$highlight_format" --style="$HIGHLIGHT_STYLE" --force -- "$file"
				# pygmentize -f "${pygmentize_format}" -O "style=${PYGMENTIZE_STYLE}" -- "$file"
				exit 127;;

		# Image
		image/*)
				# Preview as text conversion
				# img2txt --gamma=0.6 -- "$file" && exit 1
				exiftool "$file"
				exit 1;;

		# Video and audio
		video/* | audio/*|application/octet-stream)
				mediainfo "$file"
				exiftool "$file"
				exit 1;;
esac

echo '----- File Type Classification -----' && file --dereference --brief -- "$file"
exit 1