Elm watcher

watcher.js

/* eslint no-console: "off" */
var spawn = require('child_process').spawn;
var fs = require("fs");
var chokidar = require('chokidar');
var sass = require('node-sass');
var chalk = require('chalk');
var connect = require('connect');
var serveStatic = require('serve-static');

var watcher = chokidar.watch(
  ['**/*.elm', '*.sass', '*.html'],
  {
    ignored: /(^|[\/\\])\../
  }
);

watcher
  .on('change', path => {
    var ext = path.substr(path.lastIndexOf("."));

    switch(ext) {
      case ".elm":
        var cmd = spawn("npm", ["run", "build-elm-raw", "--silent"], { stdio: "inherit" });
        cmd.on("close", () => console.log("\n"));
        break;
      case ".sass":
        sass.render({
          file: "style.sass",
          outFile: "build/style.css",
          // outputStyle: "compressed"
        }, function(error, result) {
          if (error) {
            console.log(chalk.red(error.formatted));
          } else {
            fs.writeFile("build/style.css", result.css, function(err){
              if(!err){
                //file written on disk
                var text = "Rendering of " + path;
                text += "\nCompleted in " + (result.stats.end - result.stats.start) + "ms\n";
                console.log(chalk.green(text));
              }
            });
          }
        });
        break;
      case ".html":
        console.log(chalk.green("Copying", path, "\n"));
        spawn("npm", ["run", "build-html", "--silent"], { stdio: "inherit" });
        break;
    }
  });

var cmd = spawn("npm", ["run", "build-debug", "--silent"], { stdio: "inherit" });
cmd.on("close", () => {
  connect()
    .use(serveStatic("./build/"))
    .listen(8080, function(){
      console.log('\n\nServer running on http://localhost:8080');
    });
});