Feature/enforce commit message style#78

.pre-commit-config.yaml

@@ -0,0 +1,8 @@
+repos:
+- repo: local
+  hooks:
+  - id: semantic-commit-msg
+    name: Check semantic commit message format
+    entry: python ./commons/git_hooks/enforce_semantic_commit_msg.py
+    language: python
+    stages : [commit-msg]

README.md

@@ -46,7 +46,9 @@ automatically [pip](https://pip.pypa.io/en/stable/) as well.
 
 
     Remember to do it with Python 3.
-
+
+- Run `pre-commit install`. For more details, check out Development > Git hooks.
+
 ### How to use it
 - Set the env var `FLASK_APP` to `time_tracker_api` and start the app:
 
@@ -74,6 +76,16 @@ DateTime strings in Azure Cosmos DB is `YYYY-MM-DDThh:mm:ss.fffffffZ` which foll
 
 ## Development
 
+### Git hooks
+We use [pre-commit](https://github.com/pre-commit/pre-commit) library to manage local git hooks, as developers we just need to run in our virtual environment:
+
+```
+pre-commit install
+```
+With this command the library will take configuration from `.pre-commit-config.yaml` and will set up the hooks by us. 
+
+Currently, we only have a hook to enforce semantic commit message.
+
 ### Test
 We are using [Pytest](https://docs.pytest.org/en/latest/index.html) for tests. The tests are located in the package 
 `tests` and use the [conventions for python test discovery](https://docs.pytest.org/en/latest/goodpractices.html#test-discovery).

commons/git_hooks/enforce_semantic_commit_msg.py

@@ -0,0 +1,29 @@
+import re
+import sys
+
+ERROR_MSG = """
+Commit failed!
+Please use semantic commit message format. Examples:
+    'feat: Applying some changes'
+    'fix: Fixing something broken'
+    'feat(config): Fix something in config files'
+
+For more details in commit message format, review https://github.com/angular/angular.js/blob/master/DEVELOPERS.md#commits
+"""
+
+SUCCESS_MSG = "Commit succeed!. Semantic commit message is correct."
+
+COMMIT_MSG_REGEX = r'(build|ci|docs|feat|fix|perf|refactor|style|test|chore|revert)(\([\w\-]+\))?:\s.*'
+
+
+# Get the commit message file
+commit_msg_file = open(sys.argv[1])  # The first argument is the file
+commit_msg = commit_msg_file.read()
+
+
+if re.match(COMMIT_MSG_REGEX, commit_msg) is None:
+    print(ERROR_MSG)
+    sys.exit(1)
+
+print(SUCCESS_MSG)
+sys.exit(0)

requirements/time_tracker_api/dev.txt

@@ -13,3 +13,6 @@ pytest-mock==2.0.0
 
 # Coverage
 coverage==4.5.1
+
+# Git hooks
+pre-commit==2.2.0