feat: allow scopes using a regular expression (#4)

.gitignore

@@ -0,0 +1 @@
+output.txt

README.md

@@ -30,7 +30,7 @@ The generated changelog
   with:
     fetch-depth: 0
 
-- uses: nielstenboom/semantic-changelog-generator@v1.0.1
+- uses: nielstenboom/semantic-changelog-generator@v1
   id: changelog
   with:
     base: v1.0.0
@@ -53,7 +53,7 @@ NOTE: if you want to enter branches with forward slashes in them, you should add
     fetch-depth: 0
 
 # point to branch with forward slashes with 'origin' prepended
-- uses: nielstenboom/semantic-changelog-generator@v1.0.1
+- uses: nielstenboom/semantic-changelog-generator@v1
   id: changelog
   with:
     base: v1.0.0

main.py

@@ -1,5 +1,6 @@
 import os
 from pathlib import Path
+import re
 import subprocess
 import sys
 
@@ -13,6 +14,18 @@ def run_command(command: str):
 
     return result.stdout.decode("utf-8")
 
+def is_semantic(prefix: str, line: str):
+    """
+    Check if line is a semantic commit message of the form:
+    <commit hash> <prefix>(<scope>): <message>
+
+    examples of input lines:
+    
+        12345678 feat(backend): add new feature
+        12345678 feat: add new feature
+    """
+    return re.match(r"(.+)"+ prefix + r"(\(.+\))*\:.*", line) is not None
+
 def main(base: str, head: str):
     run_command("git config --global --add safe.directory /github/workspace")
     result = run_command(f"git --no-pager log --oneline {base}...{head}")
@@ -25,11 +38,11 @@ def main(base: str, head: str):
     for line in result.split("\n"):
         if len(line) < COMMIT_HASH_LENGTH:
             continue
-        elif "feat:" in line:
+        elif is_semantic("feat",line):
             feat.append(line)
-        elif "fix:" in line:
+        elif is_semantic("fix",line):
             fix.append(line)
-        elif "chore:" in line:
+        elif is_semantic("chore",line):
             chore.append(line)
         else:
             other.append(line)