Function generatePatchForFile

src/codeScan/git/diffProcessor.ts:370–422

(
  repoPath: string,
  base: string,
  compare: string,
  filePath: string,
)

}

async function generatePatchForFile(
  repoPath: string,
  base: string,
  compare: string,
  filePath: string,
): Promise<PatchResult> {
  try {
    const result = await execa(
      'git',
      [
        'diff',
        '--patch',
        '--unified=3',
        '--no-color',
        '--no-ext-diff',
        `${base}...${compare}`,
        '--',
        filePath,
      ],
      {
        cwd: repoPath,
        maxBuffer: MAX_PATCH_SIZE_BYTES,
      },
    );

    const patch = result.stdout;

    // Double check patch size
    const patchSize = Buffer.byteLength(patch, 'utf8');
    if (patchSize > MAX_PATCH_SIZE_BYTES) {
      return { success: false, skipReason: 'patch too large' };
    }

    // Annotate the patch with line numbers and extract valid line ranges
    const { annotatedDiff, lineRanges } = annotateDiffWithLineRanges(patch);

    return { success: true, patch: annotatedDiff, lineRanges };
  } catch (err) {
    const errorMessage = err instanceof Error ? err.message : String(err);

    // Check if error is due to maxBuffer exceeded
    if (errorMessage.includes('maxBuffer') || errorMessage.includes('stdout maxBuffer')) {
      logger.debug(
        `git diff --patch ${filePath} exceeded maxBuffer (${MAX_PATCH_SIZE_BYTES} bytes) - patch too large`,
      );
      return { success: false, skipReason: 'patch too large' };
    }

    // Other git diff errors
    logger.debug(`git diff --patch ${filePath} failed: ${errorMessage} - skipping file`);
    return { success: false, skipReason: 'diff error' };
  }
}

async function generatePatches(
  repoPath: string,