Merge pull request #140 from stefanzweifel/feature/create-new-branch-during-checkout

Feature: Create a new branch, if the given branch name doesn't exist yet

entrypoint.sh

@@ -48,9 +48,28 @@ _switch_to_branch() {
         git fetch --depth=1;
     fi
 
-    # Switch to branch from current Workflow run
-    # shellcheck disable=SC2086
-    git checkout $INPUT_BRANCH;
+
+    # If INPUT_BRANCH is empty, just run `git checkout`
+    if [ -z "$INPUT_BRANCH" ]
+    then
+        # shellcheck disable=SC2086
+        git checkout $INPUT_BRANCH;
+    else
+        # If the branch which we should checkout already exists, just
+        # run `git checkout $INPUT_BRANCH`
+        # Otherwhise create a new branch by adding the `-b` option to
+        # `git-checkout`
+        # shellcheck disable=SC2086
+        if [ -n "$(git branch --list $INPUT_BRANCH)" ]
+        then
+            # shellcheck disable=SC2086
+            git checkout $INPUT_BRANCH;
+        else
+            # shellcheck disable=SC2086
+            git checkout -b $INPUT_BRANCH;
+        fi
+    fi
+
 }
 
 _add_files() {

tests/git-auto-commit.bats

@@ -331,3 +331,25 @@ git_auto_commit() {
 
     assert_line "::debug::git-fetch has not been executed"
 }
+
+@test "If INPUT_BRANCH is set and the branch does not exist it creates one" {
+    INPUT_BRANCH="new-branch"
+
+    run git branch
+    refute_line "new-branch"
+
+    touch "${FAKE_LOCAL_REPOSITORY}"/new-file-{1,2,3}.txt
+
+    run git_auto_commit
+
+    assert_success
+
+    assert_line "INPUT_BRANCH value: new-branch"
+    assert_line --partial "::debug::Push commit to remote branch new-branch"
+
+    # Assert that branch "new-branch" was updated on remote
+    current_sha="$(git rev-parse --verify --short new-branch)"
+    remote_sha="$(git rev-parse --verify --short origin/new-branch)"
+
+    assert_equal $current_sha $remote_sha
+}