Add check to see if the current directory is a git repo

git-redate

@@ -1,5 +1,16 @@
 #!/bin/bash
 
+is_git_repo() {
+  git rev-parse --show-toplevel > /dev/null 2>&1
+  result=$?
+  if test $result != 0; then
+    >&2 echo 'Not a git repo!'
+    exit $result
+  fi
+}
+
+is_git_repo
+
 while [[ $# -gt 1 ]]
 do
 key="$1"