add support for appimage and snap files

ChangeLog

@@ -1,6 +1,7 @@
 ****************************************************************************
 # ChangeLog for lesspipe.sh						   #
 ****************************************************************************
+- added support for appimage and snap files
 - respect color scheme setting of vim in vimcolor, add listing of file types
 - improve xml (and html) display using the xmq binary
 - fix color detection (-R) again

README.md

@@ -205,6 +205,8 @@ the author by email.
 - Debian		requires `bsdtar` or `ar`
 - cab			requires `cabextract` or `7z`
 - cpio			requires `cpio` or `bsdtar` or `7z`
+- appimage      requires `unsquashfs`
+- snap          requires `snap` and `unsquashfs`
 
 ### 4.2 List of preprocessed file types
 - directory		displayed using `ls -lA`

lesscomplete

@@ -2,7 +2,6 @@
 # lesscomplete, a helper script for the _less completion script
 # synced with lesspipe 2.12
 # Author: Wolfgang Friebel (wp.friebel AT gmail.com)
-#( [[ -n 1 && -n 2 ]] ) > /dev/null 2>&1 || exec zsh -y --ksh-arrays -- "$0" ${1+"$@"}
 
 has_cmd () {
 	command -v "$1" > /dev/null
@@ -11,9 +10,9 @@ has_cmd () {
 fileext () {
 	fn=${1##*/}
 	case "$fn" in
-		.*.*) extension=${fn##*.};;
-		.*) extension=;;
-		*.*) extension=${fn##*.};;
+		.*.*) extension=${fn##*.} ;;
+		.*) extension= ;;
+		*.*) extension=${fn##*.} ;;
 	esac
 	echo "$extension"
 }
@@ -37,15 +36,20 @@ filetype () {
 	ft="${ft#*/}"; ft="${ft%;*}"; ft="${ft#x-script.}"; ft="${ft#x-}"
 	ftype="${ft#vnd\.}"
 	### get file type from 'file' command for an unspecific result
-	if [[ "$fcat" == application && "$ftype" == octet-stream || "$fcat" == text && $ftype == plain ]]; then
-		ft=$(file -L -s -b "$1" 2> /dev/null)
-		if [[ $ft == data ]]; then
-			case "$fext" in
-				br|bro|tbr)
-					ftype=brotli ;;
-				lz4|lt4|tz4|tlz4)
-					ftype=lz4 ;;
-			esac
+	if [[ "$fcat" == application ]]; then
+		if [[ "$ftype" == octet-stream || "$fcat" == text && $ftype == plain ]]; then
+			ft=$(file -L -s -b "$1" 2> /dev/null)
+			if [[ $ft == data ]]; then
+				case "$fext" in
+					br|bro|tbr)
+						ftype=brotli ;;
+					lz4|lt4|tz4|tlz4)
+						ftype=lz4 ;;
+				esac
+			fi
+		fi
+		if [[ "$fext" == appimage || "$fext" == snap ]]; then
+			ftype="$fext"
 		fi
 	fi
 
@@ -218,7 +222,9 @@ get_unpack_cmd () {
 			{ has_cmd bsdtar && prog=bsdtar; } ;;
 		archive)
 			prog='ar'
-			has_cmd bsdtar && prog=bsdtar
+			has_cmd bsdtar && prog=bsdtar ;;
+		appimage|snap)
+			has_cmd unsquashfs && cmd=(isimage "$x" "$2" "$file2") ;;
 	esac
 	# 7z formats and fall back to 7z supported formats
 	if [[ -z $prog ]]; then
@@ -301,6 +307,17 @@ cabextract2 () {
 	cabextract -pF "$2" "$1"
 }
 
+isimage () {
+	if [[ "$1" == appimage ]]; then
+		offset="-o $("$2" --appimage-offset)"
+	fi
+	if [[ -z "$3" ]]; then
+		istemp "unsquashfs -d . -lc $offset" "$2"
+	else
+		istemp "unsquashfs -cat $offset"  "$2" "$3"
+	fi
+}
+
 isrpm () {
 	if [[ -z "$2" ]]; then
 		if has_cmd bsdtar; then

lesspipe.1

@@ -15,7 +15,8 @@ With the help of that filter \fBless\fP
 will display the uncompressed contents of compressed (\fIgzip, bzip2,
 compress, zstd, lz4, lzip, xz, lzma or brotli\fP) files. For files
 containing archives and directories, a table of contents will be displayed
-(\fItar, ar, zip, 7-zip, rar, jar, cpio, rpm, deb ms-cabinet and iso formats\fP).
+(\fItar, ar, zip, 7-zip, rar, jar, cpio, rpm, deb ms-cabinet, iso, appimage
+and snap formats\fP).
 Many other files will be reformatted for display. It includes
 \fIpdf, dvi, markdown, Office (MS and Openoffice)\fP suites formats,
 \fINetCDF, matlab, device tree blob, html, xml\fP and \fImedia (image, audio and

lesspipe.sh

@@ -78,6 +78,10 @@ filetype () {
 			[[ $fcat == text ]] && ftype="$fext" ;;
 		tsx)
 			[[ $fcat == text ]] && ftype=typescript-jsx ;;
+		appimage)
+			[[ $fcat == application && -x "$1" ]] && ftype="$fext" ;;
+		snap)
+			[[ $fcat == application ]] && ftype="$fext" ;;
 	esac
 	### get file type from 'file' command for an unspecific result
 	if [[ "$fcat" == message && $ftype == plain ]]; then
@@ -365,7 +369,9 @@ get_unpack_cmd () {
 			{ has_cmd bsdtar && prog=bsdtar; } ;;
 		archive)
 			prog='ar'
-			has_cmd bsdtar && prog=bsdtar
+			has_cmd bsdtar && prog=bsdtar ;;
+		appimage|snap)
+			has_cmd unsquashfs && cmd=(isimage "$x" "$2" "$file2") ;;
 	esac
 	# 7z formats and fall back to 7z supported formats
 	if [[ -z $prog ]]; then
@@ -703,6 +709,21 @@ ispdf () {
 	istemp pdftohtml -i -q -s -noframes -nodrm -stdout "$1"|ishtml -
 }
 
+isimage () {
+	if [[ "$1" == appimage ]]; then
+		offset="-o $("$2" --appimage-offset)"
+	fi
+	if [[ -z "$3" ]]; then
+		if [[ "$1" == snap ]]; then
+			has_cmd snap && snap info "$2"
+			separatorline
+		fi
+		istemp "unsquashfs -d . -llc $offset" "$2"
+	else
+		istemp "unsquashfs -cat $offset"  "$2" "$3"
+	fi
+}
+
 isrpm () {
 	if [[ -z "$2" ]]; then
 		if has_cmd rpm; then