Lint a list of files with Jake.js

Jakefile.js

"use strict";

var TOUCH_DIR_PREFIX = "generated/lint/";

var path = require("path");

var touchFiles = filesToLint().map(touchFileName);
var touchDirs = uniqify(touchFiles.map(path.dirname));

touchDirs.forEach(directory); // this is Jake's `directory` task
task("lint", touchDirs.concat(touchFiles));
rule(".lint", sourceFileName, lintRule);

function filesToLint() {
  var javascriptFiles = new jake.FileList();
  javascriptFiles.include("src/**/*.js");
  // ... more patterns
  return javascriptFiles.toArray();
}

function touchFileName(jsFile) {
  return TOUCH_DIR_PREFIX + jsFile.replace(/\.js$/, ".lint");
}

function sourceFileName(touchFile) {
  var prefix = new RegExp("^" + TOUCH_DIR_PREFIX);
  var suffix = new RegExp("\\.lint$");

  return touchFile
    .replace(prefix, "")
    .replace(suffix, ".js");
}

function lintRule() {
  var fs = require("fs");

  if (yourLintFunction(this.source)) {
    fs.writeFileSync(this.name, "lint ok");
  }
  else {
    fail("Lint failed");
  }
}

function uniqify(array) {
  return array.reduce(function (result, value) {
    return (result.indexOf(value) < 0) ?
      result.concat(value) :
      result;
  }, []);
}