Add support for the official GitHub URL shortener

plugins/git/completions/_git-hub-short-url

@@ -0,0 +1,12 @@
+#compdef git-hub-short-url
+#autoload
+
+#
+# Completes git-hub-short-url.
+#
+# Authors:
+#   Sorin Ionescu <sorin.ionescu@gmail.com>
+#
+
+_arguments '1:url:' && return 0
+

plugins/git/functions/git-hub-short-url

@@ -0,0 +1,23 @@
+#
+# Shortens GitHub URLs.
+#
+# Authors:
+#   Sorin Ionescu <sorin.ionescu@gmail.com>
+#
+
+local url="$1"
+
+if [[ "$url" == '-' ]]; then
+  read url <&0
+fi
+
+if [[ -z "$url" ]]; then
+  print "usage: $0 [ url | - ]" >&2
+fi
+
+if (( $+commands[curl] )); then
+  curl -s -i 'http://git.io' -F "url=$url" | grep 'Location:' | sed 's/Location: //'
+else
+  print "$0: command not found: curl" >&2
+fi
+