wait for branch with new commit

bin/git-pull-and-if-origin-changed-run-tests

@@ -1,40 +1,20 @@
 #!/bin/bash
-# waits for commits on any branch on origin, pulls and build it
+# waits for commits on any branch on origin, checks it out and builds it
 
 # Configuration: Set the remote repository name and check interval
 BUILD_CMD="gw-test"              # Placeholder for the build command
 
-# Fetch the latest updates from the origin
-git fetch origin
-
-# Keep track of local branches at the start
-local_branches=$(git branch -r | sed 's/origin\///')
-
 while true; do
-    echo "Checking for new branches..."
-
-    # Fetch the latest updates from the origin
+    echo "Checking for new commits on any branch ..."
     git fetch origin
+    branch_with_new_commits=`git fetch origin >/dev/null; git for-each-ref --format='%(refname:short) %(upstream:track)' refs/heads | grep '\[behind' | cut -d'[' -f1 | head -n1`
 
-    # List the remote branches after fetching and compare with local branches
-    new_branches=$(git branch -r | sed 's/origin\///' | grep -Fxv "$local_branches")
+    if [ -n "$branch_with_new_commits" ]; then
+          echo "checking out branch: $branch_with_new_commits"
+          git checkout -b "$branch_with_new_commits" "origin/$branch_with_new_commits"
 
-    if [ -n "$new_branches" ]; then
-        for branch in $new_branches; do
-            echo "New branch detected: $branch"
-
-            # Check out the new branch locally
-            git checkout -b "$branch" "origin/$branch"
-
-            # Placeholder for build process (replace $BUILD_CMD with actual build steps)
-            echo "Building branch $branch..."
-            # eval "$BUILD_CMD"
-
-            # Update the local branch list
-            local_branches="$local_branches $branch"
-        done
-    else
-        echo "No new branches found."
+          echo "building ..."
+          eval "$BUILD_CMD"
     fi
 
     # wait 10s with a little animation