Add Claude Code integration with automatic model routing

Implemented complete Claude Code support alongside existing Aider integration:
- ClaudeCodeSolver strategy with programmatic Claude Code CLI usage
- Intelligent model detection to route Anthropic models to Claude Code
- Shared post-solver cleanup function to eliminate code duplication
- CLAUDE_CODE_MESSAGE_FORMAT constant for maintainable prompts
- Comprehensive test suite with 18 passing tests
- Automatic ANTHROPIC_API_KEY environment setup

Users can now specify any Anthropic model (claude, sonnet, haiku, opus) to use Claude Code, while other models continue using Aider.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

aider_gitea/__init__.py

@@ -134,13 +134,13 @@ def bash_cmd(*commands: str) -> str:
 
 
 AIDER_TEST = bash_cmd(
-    'echo "Setting up virtual environment"'
+    'echo "Setting up virtual environment"',
     'virtualenv venv',
-    'echo "Activating virtual environment"'
+    'echo "Activating virtual environment"',
     'source venv/bin/activate',
-    'echo "Installing package"'
+    'echo "Installing package"',
     'pip install -e .',
-    'echo "Testing package"'
+    'echo "Testing package"',
     'pytest test',
 )
 
@@ -165,6 +165,18 @@ Go ahead with the changes you deem appropriate without waiting for explicit appr
 Do not draft changes beforehand; produce changes only once prompted for a specific file.
 """
 
+CLAUDE_CODE_MESSAGE_FORMAT = """{issue}
+
+Please fix this issue by making the necessary code changes. Follow these guidelines:
+1. Run tests after making changes to ensure they pass
+2. Follow existing code style and conventions
+3. Make minimal, focused changes to address the issue
+4. Commit your changes with a descriptive message
+
+The test command for this project is: {test_command}
+The lint command for this project is: {lint_command}
+"""
+
 CODE_MODEL = None
 EVALUATOR_MODEL = 'ollama/gemma3:27b'
 
@@ -174,14 +186,52 @@ MODEL_EDIT_MODES = {
 }
 
 
-def create_aider_command(issue: str) -> list[str]:
+def run_post_solver_cleanup(repository_path: Path, solver_name: str) -> None:
+    """Run standard code quality fixes and commit changes after a code solver.
+
+    Args:
+        repository_path: Path to the repository
+        solver_name: Name of the solver (for commit message)
+    """
+    # Auto-fix standard code quality stuff
+    run_cmd(['bash', '-c', RUFF_FORMAT_AND_AUTO_FIX], repository_path, check=False)
+    run_cmd(['git', 'add', '.'], repository_path)
+    run_cmd(
+        ['git', 'commit', '-m', f'Ruff after {solver_name}'],
+        repository_path,
+        check=False,
+    )
+
+
+@dataclasses.dataclass(frozen=True)
+class CodeSolverStrategy:
+    """Base interface for code solving strategies."""
+
+    def solve_issue_round(self, repository_path: Path, issue_content: str) -> bool:
+        """Attempt to solve an issue in a single round.
+
+        Args:
+            repository_path: Path to the repository
+            issue_content: The issue description to solve
+
+        Returns:
+            True if the solution round completed without crashing, False otherwise
+        """
+        raise NotImplementedError
+
+
+@dataclasses.dataclass(frozen=True)
+class AiderCodeSolver(CodeSolverStrategy):
+    """Code solver that uses Aider for issue resolution."""
+
+    def _create_aider_command(self, issue: str) -> list[str]:
+        """Create the Aider command with all necessary flags."""
         l = [
             'aider',
             '--chat-language',
             'english',
             '--no-stream',
             '--no-analytics',
-        #'--no-check-update',
             '--test-cmd',
             AIDER_TEST,
             '--lint-cmd',
@@ -225,6 +275,120 @@ def create_aider_command(issue: str) -> list[str]:
 
         return l
 
+    def solve_issue_round(self, repository_path: Path, issue_content: str) -> bool:
+        """Solve an issue using Aider."""
+        # Primary Aider command
+        aider_command = self._create_aider_command(issue_content)
+        aider_did_not_crash = run_cmd(
+            aider_command,
+            repository_path,
+            check=False,
+        )
+        if not aider_did_not_crash:
+            return aider_did_not_crash
+
+        # Run post-solver cleanup
+        run_post_solver_cleanup(repository_path, 'aider')
+
+        return True
+
+
+@dataclasses.dataclass(frozen=True)
+class ClaudeCodeSolver(CodeSolverStrategy):
+    """Code solver that uses Claude Code for issue resolution."""
+
+    def _create_claude_command(self, issue: str) -> list[str]:
+        """Create the Claude Code command for programmatic use."""
+        cmd = [
+            'claude',
+            '-p',
+            '--output-format',
+            'json',
+            '--max-turns',
+            '10',
+        ]
+
+        if CODE_MODEL:
+            cmd.extend(['--model', CODE_MODEL])
+
+        cmd.append(issue)
+        return cmd
+
+    def solve_issue_round(self, repository_path: Path, issue_content: str) -> bool:
+        """Solve an issue using Claude Code."""
+        import json
+        import os
+
+        # Set Anthropic API key environment variable
+        env = os.environ.copy()
+        env['ANTHROPIC_API_KEY'] = secrets.anthropic_api_key()
+
+        # Prepare the issue prompt for Claude Code
+        enhanced_issue = CLAUDE_CODE_MESSAGE_FORMAT.format(
+            issue=issue_content,
+            test_command=AIDER_TEST,
+            lint_command=AIDER_LINT,
+        )
+
+        # Create Claude Code command
+        claude_command = self._create_claude_command(enhanced_issue)
+
+        # Run Claude Code
+        result = subprocess.run(
+            claude_command,
+            cwd=repository_path,
+            env=env,
+            capture_output=True,
+            text=True,
+            check=False,
+        )
+
+        if result.returncode != 0:
+            logger.error('Claude Code failed with return code %d', result.returncode)
+            logger.error('stderr: %s', result.stderr)
+            return False
+
+        # Parse response if it's JSON
+        try:
+            if result.stdout.strip():
+                response_data = json.loads(result.stdout)
+                logger.info(
+                    'Claude Code response: %s',
+                    response_data.get('text', 'No text field'),
+                )
+        except json.JSONDecodeError:
+            logger.info('Claude Code response (non-JSON): %s', result.stdout[:500])
+
+        # Run post-solver cleanup
+        run_post_solver_cleanup(repository_path, 'Claude Code')
+
+        return True
+
+
+def is_anthropic_model(model: str) -> bool:
+    """Check if the model string indicates an Anthropic/Claude model."""
+    if not model:
+        return False
+
+    anthropic_indicators = [
+        'claude',
+        'anthropic',
+        'sonnet',
+        'haiku',
+        'opus',
+    ]
+
+    model_lower = model.lower()
+    return any(indicator in model_lower for indicator in anthropic_indicators)
+
+
+def create_code_solver() -> CodeSolverStrategy:
+    """Create the appropriate code solver based on the configured model."""
+    if is_anthropic_model(CODE_MODEL):
+        return ClaudeCodeSolver()
+    else:
+        return AiderCodeSolver()
+
 
 def get_commit_messages(cwd: Path, base_branch: str, current_branch: str) -> list[str]:
     """Get commit messages between base branch and current branch.
@@ -345,33 +509,17 @@ def run_cmd(cmd: list[str], cwd: Path | None = None, check=True) -> bool:
     return result.returncode == 0
 
 
-def issue_solution_round(repository_path, issue_content):
-    # Primary Aider command
-    aider_command = create_aider_command(issue_content)
-    aider_did_not_crash = run_cmd(
-        aider_command,
-        repository_path,
-        check=False,
-    )
-    if not aider_did_not_crash:
-        return aider_did_not_crash
-
-    # Auto-fix standard code quality stuff after aider
-    run_cmd(['bash', '-c', RUFF_FORMAT_AND_AUTO_FIX], repository_path, check=False)
-    run_cmd(['git', 'add', '.'], repository_path)
-    run_cmd(['git', 'commit', '-m', 'Ruff after aider'], repository_path, check=False)
-
-    return True
-
 def remove_thinking_tokens(text: str) -> str:
     text = re.sub(r'^\s*<think>.*?</think>', '', text, flags=re.MULTILINE | re.DOTALL)
     text = text.strip()
     return text
 
+
 assert remove_thinking_tokens('<think>Hello</think>\nWorld\n') == 'World'
 assert remove_thinking_tokens('<think>\nHello\n</think>\nWorld\n') == 'World'
 assert remove_thinking_tokens('\n<think>\nHello\n</think>\nWorld\n') == 'World'
 
+
 def run_ollama(cwd: Path, texts: list[str]) -> str:
     cmd = ['ollama', 'run', EVALUATOR_MODEL.removeprefix('ollama/')]
     process = subprocess.Popen(
@@ -397,9 +545,11 @@ def parse_yes_no_answer(text: str) -> bool | None:
         return False
     return None
 
+
 assert parse_yes_no_answer('Yes.') == True
 assert parse_yes_no_answer('no') == False
 
+
 def run_ollama_and_get_yes_or_no(cwd, initial_texts: list[str]) -> bool:
     texts = list(initial_texts)
     texts.append('Think through your answer.')
@@ -455,6 +605,7 @@ def solve_issue_in_repository(
     issue_description: str,
     issue_number: str,
     gitea_client,
+    code_solver: CodeSolverStrategy,
 ) -> IssueResolution:
     logger.info('### %s #####', issue_title)
 
@@ -464,28 +615,31 @@ def solve_issue_in_repository(
     run_cmd(['git', 'checkout', repository_config.base_branch], repository_path)
     run_cmd(['git', 'checkout', '-b', branch_name], repository_path)
 
-    # Run initial ruff pass before aider
+    # Run initial ruff pass before code solver
     run_cmd(['bash', '-c', RUFF_FORMAT_AND_AUTO_FIX], repository_path, check=False)
     run_cmd(['git', 'add', '.'], repository_path)
     run_cmd(['git', 'commit', '-m', 'Initial ruff pass'], repository_path, check=False)
 
-    # Run aider
+    # Run code solver
     issue_content = f'# {issue_title}\n{issue_description}'
 
     while True:
-        # Save the commit hash after ruff but before aider
+        # Save the commit hash after ruff but before code solver
         pre_aider_commit = get_head_commit_hash(repository_path)
 
-        # Run aider
-        aider_did_not_crash = issue_solution_round(repository_path, issue_content)
-        if not aider_did_not_crash:
-            logger.error('Aider invocation failed for issue #%s', issue_number)
+        # Run code solver
+        solver_did_not_crash = code_solver.solve_issue_round(
+            repository_path,
+            issue_content,
+        )
+        if not solver_did_not_crash:
+            logger.error('Code solver invocation failed for issue #%s', issue_number)
             return IssueResolution(False)
 
-        # Check if aider made any changes beyond the initial ruff pass
+        # Check if solver made any changes beyond the initial ruff pass
         if not has_commits_on_branch(repository_path, pre_aider_commit, 'HEAD'):
             logger.error(
-                'Aider did not make any changes beyond the initial ruff pass for issue #%s',
+                'Code solver did not make any changes beyond the initial ruff pass for issue #%s',
                 issue_number,
             )
             return IssueResolution(False)
@@ -538,6 +692,7 @@ def solve_issues_in_repository(
             logger.info('Skipping already processed issue #%s: %s', issue_number, title)
         else:
             branch_name = generate_branch_name(issue_number, title)
+            code_solver = create_code_solver()
             with tempfile.TemporaryDirectory() as repository_path:
                 issue_resolution = solve_issue_in_repository(
                     repository_config,
@@ -547,6 +702,7 @@ def solve_issues_in_repository(
                     issue_description,
                     issue_number,
                     client,
+                    code_solver,
                 )
             seen_issues_db.mark_as_seen(issue_url, str(issue_number))
             seen_issues_db.update_pr_info(
@@ -571,6 +727,7 @@ def solve_issues_in_repository(
                 client,
                 seen_issues_db,
                 issue_url,
+                code_solver,
             )
 
             # Handle failing pipelines
@@ -580,6 +737,7 @@ def solve_issues_in_repository(
                 branch_name,
                 Path(repository_path),
                 client,
+                code_solver,
             )
 
 
@@ -591,8 +749,9 @@ def handle_pr_comments(
     client,
     seen_issues_db,
     issue_url,
+    code_solver: CodeSolverStrategy,
 ):
-    """Fetch unresolved PR comments and resolve them via aider."""
+    """Fetch unresolved PR comments and resolve them via code solver."""
     comments = client.get_pull_request_comments(
         repository_config.owner,
         repository_config.repo,
@@ -614,8 +773,8 @@ def handle_pr_comments(
             f'Resolve the following reviewer comment:\n{body}\n\n'
             f'File: {path}\n\nContext:\n{context}'
         )
-        # invoke aider on the comment context
-        issue_solution_round(repository_path, issue)
+        # invoke code solver on the comment context
+        code_solver.solve_issue_round(repository_path, issue)
         # commit and push changes for this comment
         run_cmd(['git', 'add', path], repository_path, check=False)
         run_cmd(
@@ -632,8 +791,9 @@ def handle_failing_pipelines(
     branch_name: str,
     repository_path: Path,
     client,
+    code_solver: CodeSolverStrategy,
 ) -> None:
-    """Fetch failing pipelines for the given PR and resolve them via aider."""
+    """Fetch failing pipelines for the given PR and resolve them via code solver."""
     while True:
         failed_runs = client.get_failed_pipelines(
             repository_config.owner,
@@ -651,7 +811,7 @@ def handle_failing_pipelines(
             lines = log.strip().split('\n')
             context = '\n'.join(lines[-100:])
             issue = f'Resolve the following failing pipeline run {run_id}:\n\n{context}'
-            issue_solution_round(repository_path, issue)
+            code_solver.solve_issue_round(repository_path, issue)
             run_cmd(['git', 'add', '.'], repository_path, check=False)
             run_cmd(
                 ['git', 'commit', '-m', f'Resolve pipeline {run_id}'],

aider_gitea/secrets.py

@@ -9,3 +9,7 @@ def llm_api_keys() -> list[str]:
 
 def gitea_token() -> str:
     return SECRETS.load_or_fail('GITEA_TOKEN')
+
+
+def anthropic_api_key() -> str:
+    return SECRETS.load_or_fail('ANTHROPIC_API_KEY')

setup.py

@@ -109,6 +109,7 @@ def find_python_packages() -> list[str]:
     print(f'Found following packages: {packages}')
     return sorted(packages)
 
+
 with open(PACKAGE_NAME + '/_version.py') as f:
     version = parse_version_file(f.read())
 

test/test_claude_code_integration.py

@@ -0,0 +1,122 @@
+import pytest
+
+from aider_gitea import (
+    AIDER_LINT,
+    AIDER_TEST,
+    CLAUDE_CODE_MESSAGE_FORMAT,
+    AiderCodeSolver,
+    ClaudeCodeSolver,
+    create_code_solver,
+    is_anthropic_model,
+)
+
+
+class TestClaudeCodeIntegration:
+    """Test Claude Code integration and model routing logic."""
+
+    def test_is_anthropic_model_detection(self):
+        """Test that Anthropic models are correctly detected."""
+        # Anthropic models should return True
+        assert is_anthropic_model('claude-3-sonnet')
+        assert is_anthropic_model('claude-3-haiku')
+        assert is_anthropic_model('claude-3-opus')
+        assert is_anthropic_model('anthropic/claude-3-sonnet')
+        assert is_anthropic_model('Claude-3-Sonnet')  # Case insensitive
+        assert is_anthropic_model('ANTHROPIC/CLAUDE')
+        assert is_anthropic_model('some-sonnet-model')
+        assert is_anthropic_model('haiku-variant')
+
+        # Non-Anthropic models should return False
+        assert not is_anthropic_model('gpt-4')
+        assert not is_anthropic_model('gpt-3.5-turbo')
+        assert not is_anthropic_model('ollama/llama')
+        assert not is_anthropic_model('gemini-pro')
+        assert not is_anthropic_model('mistral-7b')
+        assert not is_anthropic_model('')
+        assert not is_anthropic_model(None)
+
+    def test_create_code_solver_routing(self, monkeypatch):
+        """Test that the correct solver is created based on model."""
+        import aider_gitea
+
+        # Test Anthropic model routing
+        monkeypatch.setattr(aider_gitea, 'CODE_MODEL', 'claude-3-sonnet')
+        solver = create_code_solver()
+        assert isinstance(solver, ClaudeCodeSolver)
+
+        # Test non-Anthropic model routing
+        monkeypatch.setattr(aider_gitea, 'CODE_MODEL', 'gpt-4')
+        solver = create_code_solver()
+        assert isinstance(solver, AiderCodeSolver)
+
+        # Test None model routing (should default to Aider)
+        monkeypatch.setattr(aider_gitea, 'CODE_MODEL', None)
+        solver = create_code_solver()
+        assert isinstance(solver, AiderCodeSolver)
+
+    def test_claude_code_solver_command_creation(self):
+        """Test that Claude Code commands are created correctly."""
+        import aider_gitea
+
+        solver = ClaudeCodeSolver()
+        issue = 'Fix the bug in the code'
+
+        # Test without model
+        with pytest.MonkeyPatch().context() as m:
+            m.setattr(aider_gitea, 'CODE_MODEL', None)
+            cmd = solver._create_claude_command(issue)
+            expected = [
+                'claude',
+                '-p',
+                '--output-format',
+                'json',
+                '--max-turns',
+                '10',
+                issue,
+            ]
+            assert cmd == expected
+
+        # Test with model
+        with pytest.MonkeyPatch().context() as m:
+            m.setattr(aider_gitea, 'CODE_MODEL', 'claude-3-sonnet')
+            cmd = solver._create_claude_command(issue)
+            expected = [
+                'claude',
+                '-p',
+                '--output-format',
+                'json',
+                '--max-turns',
+                '10',
+                '--model',
+                'claude-3-sonnet',
+                issue,
+            ]
+            assert cmd == expected
+
+    def test_claude_code_message_format(self):
+        """Test that Claude Code message format works correctly."""
+        issue_content = 'Fix the authentication bug'
+
+        formatted_message = CLAUDE_CODE_MESSAGE_FORMAT.format(
+            issue=issue_content,
+            test_command=AIDER_TEST,
+            lint_command=AIDER_LINT,
+        )
+
+        # Verify the issue content is included
+        assert issue_content in formatted_message
+
+        # Verify the test and lint commands are included
+        assert AIDER_TEST in formatted_message
+        assert AIDER_LINT in formatted_message
+
+        # Verify the guidelines are present
+        assert 'Run tests after making changes' in formatted_message
+        assert 'Follow existing code style' in formatted_message
+        assert 'Make minimal, focused changes' in formatted_message
+        assert 'Commit your changes' in formatted_message
+
+        # Verify the structure contains placeholders that got replaced
+        assert '{issue}' not in formatted_message
+        assert '{test_command}' not in formatted_message
+        assert '{lint_command}' not in formatted_message