git - Allow commit to unborn main branch

Allow committing directly to the main branch if it doesn't contain any
commits. This will make it easier to get initial work ready to push to
remote repo prior to requiring updates via PR.

git_template/hooks/pre-commit

@@ -8,10 +8,16 @@ fi
 
 if [ "$(git config --type=bool --default=no commit.allowedOnMain)" = false ]
 then
-  case "$(git symbolic-ref HEAD)" in
-    refs/heads/master|refs/heads/main)
-      echo "Create a new branch before committing, or set commit.allowedOnMain" >&2
-      exit 1
-      ;;
-  esac
+  ref=$(git symbolic-ref HEAD)
+
+  # Allow initial commit to main branch
+  if git rev-parse "$ref" >/dev/null 2>&1
+  then
+    case "$ref" in
+      refs/heads/master|refs/heads/main)
+        echo "Create a new branch before committing, or set commit.allowedOnMain" >&2
+        exit 1
+        ;;
+    esac
+  fi
 fi