add git shortrev

diff --git a/git-shortrev b/git-shortrev
new file mode 100755 (executable)
index 0000000..9af7e4b
--- /dev/null
+++ b/git-shortrev
@@ -0,0 +1,19 @@
+#!/bin/bash
+
+_usage() {
+    echo "Usage: git shortrev <committish>" 1>&2
+    exit 1
+}
+
+_shortrev() {
+    commit="${1:-HEAD}"
+    name="$(git name-rev --name-only "$commit")";
+    rev="$(git rev-parse --short "$commit")";
+    echo "$name@$rev";
+}
+
+case $# in
+    1 ) _shortrev "$1";;
+    0 ) _shortrev;;
+    * ) _usage
+esac