posix-shell: utils: Add `lar()`

The list archive (`lar`) util creates a temporary directory, unpacks the
given tar archive into it, switches to that folder, starts the terminal
file manager `lf` and on quit jumps back and deletes the temporary
directory.

This is useful to quickly inspect the contents of a tar archive.

1 files changed, 9 insertions, 0 deletions

diff --git a/posix-shell/utils.sh b/posix-shell/utils.sh
index 596263e..b1ffc21 100644
--- a/posix-shell/utils.sh
+++ b/posix-shell/utils.sh
@@ -216,3 +216,12 @@ url() {
 	# open selected URL in browser
 	firefox "${url}"
 }
+
+lar() {
+	temp="$(mktemp -d)"
+	tar -xf "$1" -C "$temp"
+	pushd "$temp"
+	lf
+	popd
+	rm -rf "$temp"
+}