findPackage.js

// Find package folder
const fs = require("fs");
const findit = require("findit2");
const path = require("path");
const relative = require("relative");

const findPackage = function (packageName, searchPath) {
  return new Promise((resolve, reject) => {
    try {
      searchPath = path.resolve(process.cwd(), searchPath);
    } catch (err) {
      reject("searchPath does not exist");
    }
    const finder = findit(searchPath);
    // eslint-disable-next-line no-unused-vars
    finder.on("file", (file, stat, stop) => {
      const basename = path.basename(file);
      if (basename == "package.json") {
        const dirname = relative(process.cwd(), path.dirname(file));
        let pkg = null;
        try {
          pkg = require(path.join(file));
        } catch (err) {
          return;
        }
        if (pkg.name != packageName) {
          console.debug(
            `Mismatched package name in ${path.join(dirname, basename)}: actual=${pkg.name}, expected=${packageName}`
          );
          return;
        }
        console.debug(`Found package name in ${path.join(dirname, basename)}`);
        finder.stop();
        resolve({ dirname, pkg, file });
      }
    });
    finder.on("end", () => {
      resolve(null);
    });
    finder.on("error", () => {
      finder.stop();
      reject("find package.json error");
    });
  });
};

if (require.main === module) {
  if (process.argv.length < 5) {
    console.log(
      "Usage: node findPackage.js <pkg-name> <search-path> <output-filename>"
    );
    process.exit(1);
  } else {
    findPackage(process.argv[2], process.argv[3])
      .then((result) => {
        if (result) {
          // Write to output file
          const outputFilename = process.argv[4];
          const content = JSON.stringify(result);
          try {
            fs.writeFileSync(outputFilename, content);
            console.log("Saved to " + outputFilename);
          } catch (err) {
            console.error(err);
          }
        }
      })
      .catch(() => {});
  }
}

module.exports = { findPackage };