@emanuelsan/mosaic-js/dist/utils/findMarkdownFileById.js

Composable Markdown-based AI instruction engine for Node.js

import { execSync } from 'child_process';
import fs from 'fs';
import path from 'path';
import matter from 'gray-matter';
/**
 * Searches for a markdown file in a directory tree whose frontmatter id matches the given id.
 * Uses ripgrep to efficiently search only the YAML frontmatter region (between --- at the top).
 * Returns the absolute path to the file if found, otherwise undefined.
 */
export function findMarkdownFileById(rootDir, id) {
    let rgResults;
    try {
        rgResults = execSync(`rg --type md --null -l -U -e "^id: ?${id}$" "${rootDir}"`, { encoding: 'utf-8' });
    }
    catch (e) {
        // No matches found
        return undefined;
    }
    // rg --null -l returns null-separated file paths
    const files = rgResults.split('\0').filter(Boolean);
    const matches = [];
    // Check if any of the files have the same id
    // Also check if there are any false positives in the sense that the id is in a comment or something
    // This is done by checking if the id is in the frontmatter, not just in the result from ripgrep
    for (const file of files) {
        const absPath = path.resolve(file);
        const content = fs.readFileSync(absPath, 'utf-8');
        const { data } = matter(content);
        if (data && typeof data.id === 'string' && data.id === id) {
            matches.push(absPath);
        }
    }
    // If there are multiple matches, return the first one but warn the user
    if (matches.length > 1) {
        console.warn(`Warning: Multiple markdown files found with id '#${id}'.\nReturning the first one: ${matches[0]}`);
    }
    return matches[0];
}
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