fix: Ignore tags that are not a valid semver

PR-74: #74

src/git_changelog/commit.py

@@ -9,6 +9,8 @@
 from datetime import datetime, timezone
 from typing import TYPE_CHECKING, Any, ClassVar, Pattern
 
+from semver import VersionInfo
+
 if TYPE_CHECKING:
     from git_changelog.providers import ProviderRefParser, Ref
 
@@ -21,6 +23,12 @@ def _clean_body(lines: list[str]) -> list[str]:
     return lines
 
 
+def _is_semver(version: str) -> bool:
+    if version[0] == "v":
+        version = version[1:]
+    return VersionInfo.is_valid(version)
+
+
 class Commit:
     """A class to represent a commit."""
 
@@ -82,8 +90,10 @@ def __init__(
         for ref in refs.split(","):
             ref = ref.strip()  # noqa: PLW2901
             if ref.startswith("tag: "):
-                tag = ref.replace("tag: ", "")
-                break
+                ref = ref.replace("tag: ", "")  # noqa: PLW2901
+                if _is_semver(ref):
+                    tag = ref
+                    break
         self.tag: str = tag
         self.version: str = tag
 

tests/test_build.py

@@ -47,6 +47,39 @@ def test_no_bump_on_first_tag(repo: GitRepo, bump: str) -> None:
     assert changelog.versions_list[0].tag == "1.1.1"
 
 
+def test_ignore_nonsemver_tag(repo: GitRepo) -> None:
+    r"""Test parsing and grouping commits to versions.
+
+    Commit graph:
+                 1.0.0
+                   |
+    main       A-B-C
+                 |
+               dummy
+
+    Expected:
+    - 1.0.0: C B A
+
+    Parameters:
+        repo: GitRepo to a temporary repository.
+    """
+    commit_a = repo.first_hash
+    commit_b = repo.commit("fix: B")
+    repo.tag("dummy")
+    commit_c = repo.commit("feat: C")
+    repo.tag("1.0.0")
+
+    changelog = Changelog(repo.path, convention=AngularConvention)
+
+    assert len(changelog.versions_list) == 1
+    _assert_version(
+        changelog.versions_list[0],
+        expected_tag="1.0.0",
+        expected_prev_tag=None,
+        expected_commits=[commit_c, commit_b, commit_a],
+    )
+
+
 def test_one_release_branch_with_feat_branch(repo: GitRepo) -> None:
     r"""Test parsing and grouping commits to versions.