Support any email domain for co-authors, not just GitHub noreply

Co-authored-by: zkoppert <6935431+zkoppert@users.noreply.github.com>

Author: Copilot

README.md

@@ -93,13 +93,13 @@ This action can be configured to authenticate with GitHub App Installation or Pe
 | `END_DATE`              | False                                           | Current Date      | The date at which you want to stop gathering contributor information. Must be later than the `START_DATE`. ie. Aug 2nd, 2023 would be `2023-08-02`                                                                       |
 | `SPONSOR_INFO`          | False                                           | False             | If you want to include sponsor information in the output. This will include the sponsor count and the sponsor URL. This will impact action performance. ie. SPONSOR_INFO = "False" or SPONSOR_INFO = "True"              |
 | `LINK_TO_PROFILE`       | False                                           | True              | If you want to link usernames to their GitHub profiles in the output. ie. LINK_TO_PROFILE = "True" or LINK_TO_PROFILE = "False"                                                                                          |
-| `ACKNOWLEDGE_COAUTHORS` | False                                           | True              | If you want to include co-authors from commit messages as contributors. Co-authors are identified via the `Co-authored-by:` trailer in commit messages using the GitHub noreply email format (e.g., `username@users.noreply.github.com`). This will impact action performance as it requires scanning all commits. ie. ACKNOWLEDGE_COAUTHORS = "True" or ACKNOWLEDGE_COAUTHORS = "False" |
+| `ACKNOWLEDGE_COAUTHORS` | False                                           | True              | If you want to include co-authors from commit messages as contributors. Co-authors are identified via the `Co-authored-by:` trailer in commit messages. The action will extract GitHub usernames from GitHub noreply emails (e.g., `username@users.noreply.github.com`) or use the full email address for other email domains. This will impact action performance as it requires scanning all commits. ie. ACKNOWLEDGE_COAUTHORS = "True" or ACKNOWLEDGE_COAUTHORS = "False" |
 
 **Note**: If `start_date` and `end_date` are specified then the action will determine if the contributor is new. A new contributor is one that has contributed in the date range specified but not before the start date.
 
 **Performance Note:** Using start and end dates will reduce speed of the action by approximately 63X. ie without dates if the action takes 1.7 seconds, it will take 1 minute and 47 seconds.
 
-**Co-authors Note:** When `ACKNOWLEDGE_COAUTHORS` is enabled, the action will scan commit messages for `Co-authored-by:` trailers and include those users as contributors. Only co-authors with GitHub noreply email addresses (e.g., `username@users.noreply.github.com`) will be recognized, as this is the standard format used by GitHub for [creating commits with multiple authors](https://docs.github.com/en/pull-requests/committing-changes-to-your-project/creating-and-editing-commits/creating-a-commit-with-multiple-authors).
+**Co-authors Note:** When `ACKNOWLEDGE_COAUTHORS` is enabled, the action will scan commit messages for `Co-authored-by:` trailers and include those users as contributors. For GitHub noreply email addresses (e.g., `username@users.noreply.github.com`), the username will be extracted. For other email addresses (e.g., `john@example.com`), the full email address will be used as the contributor identifier. See [GitHub's documentation on creating commits with multiple authors](https://docs.github.com/en/pull-requests/committing-changes-to-your-project/creating-and-editing-commits/creating-a-commit-with-multiple-authors).
 
 ### Example workflows
 

contributors.py

@@ -156,32 +156,37 @@ def get_all_contributors(
 
 def get_coauthors_from_message(commit_message: str) -> List[str]:
     """
-    Extract co-author usernames from a commit message.
+    Extract co-author identifiers from a commit message.
 
     Co-authored-by trailers follow the format:
     Co-authored-by: Name <email>
-    Or with a GitHub username:
-    Co-authored-by: Name <username@users.noreply.github.com>
+
+    For GitHub noreply emails (username@users.noreply.github.com), extracts the username.
+    For other emails, extracts the full email address.
 
     Args:
         commit_message (str): The commit message to parse
 
     Returns:
-        List[str]: List of GitHub usernames extracted from co-author trailers
+        List[str]: List of co-author identifiers (GitHub usernames or email addresses)
     """
     # Match Co-authored-by trailers - case insensitive
     # Format: Co-authored-by: Name <email>
     pattern = r"Co-authored-by:\s*[^<]*<([^>]+)>"
     matches = re.findall(pattern, commit_message, re.IGNORECASE)
 
-    usernames = []
+    identifiers = []
     for email in matches:
         # Check if it's a GitHub noreply email format: username@users.noreply.github.com
         noreply_pattern = r"^(\d+\+)?([^@]+)@users\.noreply\.github\.com$"
         noreply_match = re.match(noreply_pattern, email)
         if noreply_match:
-            usernames.append(noreply_match.group(2))
-    return usernames
+            # For GitHub noreply emails, extract just the username
+            identifiers.append(noreply_match.group(2))
+        else:
+            # For other emails, use the full email address
+            identifiers.append(email)
+    return identifiers
 
 
 def get_contributors(

test_contributors.py

@@ -256,14 +256,14 @@ def test_get_coauthors_from_message_multiple_coauthors(self):
 
     def test_get_coauthors_from_message_with_regular_email(self):
         """
-        Test that regular emails are not extracted as co-authors.
+        Test that regular emails are extracted as co-authors.
         """
         message = """Fix bug
 
 Co-authored-by: John Doe <john@example.com>
 """
         result = get_coauthors_from_message(message)
-        self.assertEqual(result, [])
+        self.assertEqual(result, ["john@example.com"])
 
     def test_get_coauthors_from_message_case_insensitive(self):
         """
@@ -292,6 +292,19 @@ def test_get_coauthors_from_message_no_coauthors(self):
         result = get_coauthors_from_message(message)
         self.assertEqual(result, [])
 
+    def test_get_coauthors_from_message_mixed_email_types(self):
+        """
+        Test extracting co-authors with both GitHub noreply and regular emails.
+        """
+        message = """Feature implementation
+
+Co-authored-by: Alice <alice@users.noreply.github.com>
+Co-authored-by: Bob <bob@example.com>
+Co-authored-by: Charlie <12345+charlie@users.noreply.github.com>
+"""
+        result = get_coauthors_from_message(message)
+        self.assertEqual(result, ["alice", "bob@example.com", "charlie"])
+
     def test_get_coauthor_contributors(self):
         """
         Test the get_coauthor_contributors function.