Allow for more control in template variables

Sepearate commit message coming from git for handling in template.

pre_commit_hooks/prepare_commit_msg.py

@@ -47,7 +47,7 @@ def _get_default_template() -> str:
 
 def get_rendered_template(
         template_file: str,
-        variables: dict[str, str],
+        variables: dict[str, Sequence[str]],
 ) -> str:
     with open(template_file) as f:
         template = Template(f.read())
@@ -63,6 +63,8 @@ def update_commit_file(
         with open(commit_msg_file) as f:
             data = f.readlines()
 
+        commented = list(filter(lambda line: line.startswith('#'), data))
+        original = list(filter(lambda line: not line.startswith('#'), data))
         data_as_str = ''.join([item for item in data])
         # if message already contain ticket number means
         # it is under git commit --amend or rebase or alike
@@ -73,6 +75,8 @@ def update_commit_file(
         variables = {
             'ticket': ticket,
             'content': data_as_str,
+            'commented': commented,
+            'original_msg': original,
         }
 
         content = get_rendered_template(

templates/prepare_commit_msg_append.j2

@@ -1,3 +1,5 @@
-{{ content }}
+{{ original_msg | join('') | trim() }}
 
-Relates: {{ ticket }}
+Relates: #{{ ticket }}
+
+{{ commented | join('') }}

templates/prepare_commit_msg_prepend.j2

@@ -1 +1 @@
-[{{ ticket }}] {{ content }}
+[{{ ticket }}] {{ content | join('') }}

tests/prepare_commit_msg_test.py

@@ -52,13 +52,13 @@ TESTS = (
     ),
     (
         b'',
-        b'\n\nRelates: AA-01',
+        b'\n\nRelates: #AA-01\n\n',
         'feature/AA-01',
         get_template_path('prepare_commit_msg_append.j2'),
     ),
     (
         b'Initial message',
-        b'Initial message\n\nRelates: AA-02',
+        b'Initial message\n\nRelates: #AA-02\n\n',
         'feature/AA-02',
         get_template_path('prepare_commit_msg_append.j2'),
     ),
@@ -110,3 +110,44 @@ def test_main(
             ],
         ) == 0
         assert path.read_binary() == expected_val
+
+
+TESTS_TEMPLATES = (
+    (
+        b'Initial Message\n\n# Git commented\n# output simulated',
+        b'[1.0.0] Initial Message\n\n# Git commented\n# output simulated',
+        'release/1.0.0',  # but this should
+        get_template_path('prepare_commit_msg_prepend.j2'),
+    ),
+    (
+        b'Initial Message\n# Git commented\n# output simulated',
+        b'Initial Message\n\nRelates: #1.0.0\n\n'
+        b'# Git commented\n# output simulated',
+        'release/1.0.0',  # but this should
+        get_template_path('prepare_commit_msg_append.j2'),
+    ),
+)
+
+
+@pytest.mark.parametrize(
+    ('input_s', 'expected_val', 'branch_name', 'template'),
+    TESTS_TEMPLATES,
+)
+def test_main_separating_content(
+        input_s, expected_val, branch_name, template,
+        temp_git_dir,
+):
+    with temp_git_dir.as_cwd():
+        path = temp_git_dir.join('file.txt')
+        path.write_binary(input_s)
+        assert path.read_binary() == input_s
+
+        cmd_output('git', 'checkout', '-b', branch_name)
+        assert main(
+            argv=[
+                '-t', template,
+                '-p', '(?<=release/).*',
+                str(path),
+            ],
+        ) == 0
+        assert path.read_binary() == expected_val