Delta MCP Server

"""MCP resources for Delta.""" import logging import asyncio import shutil from pathlib import Path from mcp.server.fastmcp import FastMCP from delta_wrapper import execute_git_then_delta from git_utils import get_git_repo_root from validation import validate_path, validate_commit_range from config_manager import get_config_manager logger = logging.getLogger(__name__) def register_resources(mcp: FastMCP) -> None: """Register MCP resources with the server.""" @mcp.resource("delta://diff/{commit_hash}") async def get_commit_diff(commit_hash: str) -> str: """Get formatted diff for a specific commit. Args: commit_hash: Git commit hash or reference """ try: commit_hash = validate_commit_range(commit_hash) except ValueError as e: return f"Error: {str(e)}" git_cmd = ["git", "show", commit_hash] delta_cmd = ["delta"] config_mgr = get_config_manager() merged_config = config_mgr.merge_with_overrides({}) if merged_config.get("syntax-theme"): delta_cmd.extend(["--syntax-theme", merged_config.get("syntax-theme")]) if merged_config.get("side-by-side"): delta_cmd.append("--side-by-side") if merged_config.get("line-numbers", True): delta_cmd.append("--line-numbers") return await execute_git_then_delta(git_cmd, delta_cmd) @mcp.resource("delta://blame/{file_path}") async def get_file_blame(file_path: str) -> str: """Get formatted blame for a file. Args: file_path: Path to file """ git_repo_root = await get_git_repo_root() try: validated_path = validate_path(file_path, git_repo_root) except ValueError as e: return f"Error: {str(e)}" git_cmd = ["git", "blame", validated_path] delta_cmd = ["delta"] config_mgr = get_config_manager() merged_config = config_mgr.merge_with_overrides({}) if merged_config.get("syntax-theme"): delta_cmd.extend(["--syntax-theme", merged_config.get("syntax-theme")]) if merged_config.get("line-numbers", True): delta_cmd.append("--line-numbers") return await execute_git_then_delta(git_cmd, delta_cmd) @mcp.resource("delta://grep/{pattern}") async def get_grep_results(pattern: str) -> str: """Get formatted grep results. Args: pattern: Search pattern """ git_cmd = ["git", "grep", "-n", "--color=always", pattern] delta_cmd = ["delta"] config_mgr = get_config_manager() merged_config = config_mgr.merge_with_overrides({}) if merged_config.get("syntax-theme"): delta_cmd.extend(["--syntax-theme", merged_config.get("syntax-theme")]) if merged_config.get("line-numbers", True): delta_cmd.append("--line-numbers") return await execute_git_then_delta(git_cmd, delta_cmd) @mcp.resource("delta://config") async def get_delta_config() -> str: """Get current Delta configuration.""" config_mgr = get_config_manager() delta_config = config_mgr.get_delta_config() if not delta_config: return "No Delta configuration found in Git config." # Format as readable text lines = ["Delta Configuration:"] for key, value in sorted(delta_config.items()): lines.append(f" {key} = {value}") return "\n".join(lines) @mcp.resource("delta://themes") async def get_available_themes() -> str: """List available syntax highlighting themes.""" # Delta uses bat's themes, try to get list from bat bat_path = shutil.which("bat") if bat_path: try: proc = await asyncio.create_subprocess_exec( bat_path, "--list-themes", stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.DEVNULL ) stdout, _ = await proc.communicate() if proc.returncode == 0: themes = stdout.decode('utf-8').strip().split('\n') return "Available themes:\n" + "\n".join(f" - {t}" for t in themes if t.strip()) except Exception as e: logger.warning(f"Could not get themes from bat: {e}") # Fallback: common themes common_themes = [ "github", "dracula", "monokai", "nord", "one-dark", "one-light", "solarized-dark", "solarized-light", "gruvbox-dark", "gruvbox-light" ] return "Available themes (common):\n" + "\n".join(f" - {t}" for t in common_themes)