// src/tools/gitMergeDiff/gitMergeDiff.ts
import { z } from "zod";
import { CallToolResult } from "@modelcontextprotocol/sdk/types.js";
import path from "path";
import { readFile, unlink } from "fs/promises";
import {
runPowershellScript
} from "../../utils/scriptRunner.js";
import {
OUTPUT_FILE_PATH,
OUTPUT_DIFF_FILE,
SCRIPT_PATH
} from "../../utils/fileConstants.js";
// Tool schema definition
export const gitMergeDiffSchema = {
commitHash: z.string().min(6).regex(/^[a-fA-F0-9]+$/, "Must be a valid hex commit hash")
.describe("The Git commit hash (SHA) of the merge commit."),
repoPath: z.string().min(1)
.describe("The absolute path to the local Git repository directory.")
};
// Tool handler implementation
export async function gitMergeDiffHandler({ commitHash, repoPath }: {
commitHash: string;
repoPath: string;
}): Promise<CallToolResult> {
console.error(`[Tool] 'get_git_merge_diff' called with commitHash: ${commitHash}, repoPath: ${repoPath}`);
// Basic validation for absolute path
if (!path.isAbsolute(repoPath)) {
const message = "Error: repoPath must be an absolute path.";
console.error(`[Tool] Validation Failed: ${message}`);
return { content: [{ type: "text", text: message }] };
}
// Prepare arguments for the PowerShell script
const scriptArgs = {
CommitHash: commitHash,
RepoPath: repoPath
};
// Execute the script with the new calling approach
const { success, stdout: scriptStdout, stderr: scriptStderr, errorMessage, code } =
await runPowershellScript(SCRIPT_PATH, scriptArgs);
if (!success) {
console.error(`[Tool] Script execution failed. Code: ${code}. Error: ${errorMessage}`);
// Make error message slightly more user-friendly
let finalErrorMessage = `Error generating diff: ${errorMessage || 'Unknown execution error'}`;
if (code === 1 && (scriptStderr?.includes("Repository path") || scriptStdout?.includes("Repository path"))) {
finalErrorMessage = `Error: Invalid Repository Path specified: ${repoPath}. Path does not exist or is not a directory.`;
} else if (code !== null && code !== 0) {
finalErrorMessage = `Error generating diff: Script failed (code ${code}). Check repository path and commit hash validity. Details might be in stderr or stdout logs.`;
}
return {
content: [{ type: "text", text: finalErrorMessage }],
};
}
// Script execution reported success (Exit Code: 0)
console.error(`[Tool] Script execution succeeded (Exit Code: 0). Reading output file...`);
let diffContent = "";
let fileError = false;
let fileErrorMessage = "";
try {
console.error(`[Tool] Attempting to read diff file: ${OUTPUT_FILE_PATH}`);
diffContent = await readFile(OUTPUT_FILE_PATH, { encoding: "utf8" });
console.error(`[Tool] Successfully read ${diffContent.length} characters from diff file.`);
if (!diffContent.trim()) {
diffContent = `Script executed successfully, but the generated diff was empty.`;
if (scriptStdout.includes("diff was empty") || scriptStdout.includes("succeeded")) {
diffContent += `\nScript Output:\n${scriptStdout.trim()}`;
}
console.warn("[Tool] Diff file was empty.");
}
} catch (readError: any) {
fileError = true;
console.error(`[Tool] Error reading diff file '${OUTPUT_FILE_PATH}': ${readError}`);
if (readError.code === 'ENOENT') {
fileErrorMessage = `Error: Script finished successfully, but the expected output file '${OUTPUT_DIFF_FILE}' was not found in the working directory (${process.cwd()}). Check permissions or script execution details.`;
} else {
fileErrorMessage = `Error: Script finished successfully, but failed to read output file '${OUTPUT_DIFF_FILE}': ${readError.message}`;
}
diffContent = fileErrorMessage;
}
// Attempt to clean up the diff file
try {
await unlink(OUTPUT_FILE_PATH);
console.error(`[Tool] Successfully deleted temporary diff file: ${OUTPUT_FILE_PATH}`);
} catch (unlinkError: any) {
if (unlinkError.code !== 'ENOENT') {
console.warn(`[Tool] Warning: Failed to delete temporary diff file '${OUTPUT_FILE_PATH}': ${unlinkError.message}`);
if (!fileError) {
diffContent += `\n(Warning: Could not delete temporary diff file.)`;
}
}
}
// Return the content
return {
content: [{ type: "text", text: diffContent }],
};
}
