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

@@ -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'
 
@@ -174,6 +186,23 @@ MODEL_EDIT_MODES = {
 }
 
 
+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."""
@@ -258,18 +287,109 @@ class AiderCodeSolver(CodeSolverStrategy):
         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,
+        # 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.
 
@@ -572,7 +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 = AiderCodeSolver()
+            code_solver = create_code_solver()
             with tempfile.TemporaryDirectory() as repository_path:
                 issue_resolution = solve_issue_in_repository(
                     repository_config,

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')

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