try to support a single ignore expression

action.yml

@@ -51,3 +51,6 @@ inputs:
   ORG_PROJECTS:
     description: "Default organisation projects"
     required: false
+  IGNORE:
+    description: "A regular expression that matches files that should be ignored when searching for TODOs"
+    required: false

main.py

@@ -348,6 +348,8 @@ class TodoParser(object):
             if not filename_search:
                 continue
             curr_file = filename_search.group(0)
+            if self._should_ignore(curr_file):
+                continue
             curr_markers, curr_markdown_language = self._get_file_details(curr_file)
             if not curr_markers or not curr_markdown_language:
                 print(f'Could not check {curr_file} for TODOs as this language is not yet supported by default.')
@@ -604,6 +606,13 @@ class TodoParser(object):
             projects = list(filter(None, projects.split(',')))
         return projects
 
+    def _should_ignore(self, file):
+        ignore_pattern = os.getenv('INPUT_IGNORE', None)
+        if ignore_pattern:
+            if re.match(ignore_pattern, file):
+                return True
+        return False
+
 
 if __name__ == "__main__":
     # Create a basic client for communicating with GitHub, automatically initialised with environment variables.

tests/test_todo_parser.py

@@ -1,3 +1,4 @@
+import os
 import unittest
 from main import TodoParser
 
@@ -52,3 +53,16 @@ class ClosedIssueTests(unittest.TestCase):
 
     def test_ruby_issues(self):
         self.assertEqual(count_issues_for_file_type(self.raw_issues, 'ruby'), 3)
+
+class IgnorePatternTests(unittest.TestCase):
+
+    def test_single_ignore(self):
+        os.environ['INPUT_IGNORE'] = '.*\.java'
+        diff_file = open('tests/test_new.diff', 'r')
+        self.raw_issues = TodoParser().parse(diff_file)
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'python'), 2)
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'yaml'), 2)
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'php'), 4)
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'java'), 0)
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'ruby'), 3)
+        os.environ['INPUT_IGNORE'] = ''