bin/ex: automatically use subdirectory

.local/bin/scripts/ex

@@ -1,8 +1,14 @@
-#!/bin/sh
+#!/bin/sh -e
 # ex - archive extractor
 # usage: ex <file>
 for arg do
 	if test -r "$arg"; then
+		arg="$(realpath "$arg")"
+		name="$(basename "${arg%.*}")"
+		if test "$(ls -U | wc -l)" -gt 2; then
+			mkdir "$name"
+			cd "$name"
+		fi
 		case "$arg" in
 			*.tar.bz2)   tar xjf "$arg"   ;;
 			*.tar.*|*.tar) tar --extract --file "$arg";;