Load .atom-build.js without using require

Also add support for .atom-build.coffee

noseglid#553
noseglid#513

lib/atom-build.js

@@ -5,23 +5,51 @@ import EventEmitter from 'events';
 function getConfig(file) {
   const fs = require('fs');
   const realFile = fs.realpathSync(file);
-  delete require.cache[realFile];
+  const contents = fs.readFileSync(realFile);
+
+  function fromScript(script) {
+    const globals = {
+      __dirname: require('path').dirname(realFile),
+      __filename: realFile,
+      module: { exports: {} },
+      require
+    };
+    globals.exports = globals.module.exports;
+    const scriptFn = new Function(...Object.keys(globals), script);
+    scriptFn(...Object.keys(globals).map(n => globals[n]));
+    return globals.module.exports;
+  };
+
   switch (require('path').extname(file)) {
     case '.json':
+      return JSON.parse(contents);
+
     case '.js':
-      return require(realFile);
+      return fromScript(contents);
+
+    case '.coffee':
+      let coffee;
+      try
+      {
+        coffee = require('coffeescript');
+      }
+      catch (e) {}
+      if (coffee === undefined)
+      {
+        coffee = require('coffee-script');
+      }
+      return fromScript(coffee.compile(contents, { bare: true }));
 
     case '.cson':
-      return require('cson-parser').parse(fs.readFileSync(realFile));
+      return require('cson-parser').parse(contents);
 
     case '.yaml':
     case '.yml':
-      return require('js-yaml').safeLoad(fs.readFileSync(realFile));
+      return require('js-yaml').safeLoad(contents);
   }
 
   return {};
 }
-
 function createBuildConfig(build, name) {
   const conf = {
     name: 'Custom: ' + name,