Get the next version

.github/workflows/create-release-pr.yaml

@@ -30,7 +30,6 @@ jobs:
       # sidecar scripts
       - id: workflow-parsing
         name: Get SHA of reusuable workflow
-        shell: bash
         env:
           REPO: ${{ github.repository }}
           RUN_ID: ${{ github.run_id }}
@@ -53,6 +52,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           path: caller
+          fetch-tags: true
 
       - name: Set up python
         uses: actions/setup-python@v5
@@ -61,3 +61,9 @@ jobs:
 
       # Install the semver package
       - run: pip install semver==3.0.2
+
+      - run: python reusable/get_next_version.py
+        env:
+          REPO_DIR: caller
+          BUMP_TYPE: ${{ inputs.bump_type }}
+          EXACT_VERSION: ${{ inputs.exact_version }}

get_next_version.py

@@ -0,0 +1,34 @@
+"Get the next tag version."
+
+import os
+import subprocess
+from pathlib import Path
+
+import semver
+
+
+def get_next_tag():
+    "Return the next tag after the appropriate bump type."
+    repo_dir = os.environ["REPO_DIR"]
+    bump_type = os.environ["BUMP_TYPE"]
+    exact_version = os.environ["EXACT_VERSION"]
+    output_file = Path(os.environ["GITHUB_OUTPUT"])
+
+    if bump_type == "exact":
+        return exact_version
+
+    # Get the most recent ancestor tag
+    last_tag = subprocess.check_output(
+        ["git", "describe", "--tags", "--abbrev=0"],
+        cwd=repo_dir
+    ).decode("utf-8")
+
+    last_version = semver.Version.parse(last_tag)
+    next_version = last_version.next_version(part=bump_type)
+    print(f"{last_version} -> {bump_type} -> {next_version}")
+
+    with output_file.open(mode="w", encoding="utf-8") as outfile:
+        outfile.write(f"next_version={next_version}\n")
+
+if __name__ == "__main__":
+    get_next_tag()