package.json main as indexed subdir

Closes nodejsGH-686.

Author: isaacs

lib/module.js

@@ -85,7 +85,8 @@ function tryPackage(requestPath, exts) {
   if (!pkg || !pkg.main) return false;
 
   var filename = path.resolve(requestPath, pkg.main);
-  return tryFile(filename) || tryExtensions(filename, exts);
+  return tryFile(filename) || tryExtensions(filename, exts) ||
+         tryExtensions(path.resolve(filename, 'index'), exts);
 }
 
 // In order to minimize unnecessary lstat() calls,

test/fixtures/packages/main-index/package-main-module/index.js

@@ -0,0 +1 @@
+exports.ok = "ok"

test/fixtures/packages/main-index/package.json

@@ -0,0 +1,3 @@
+{"name":"package-name"
+,"version":"1.2.3"
+,"main":"package-main-module"}

test/simple/test-module-loading.js

@@ -70,6 +70,8 @@ assert.notEqual(threeFolder, three);
 common.debug('test package.json require() loading');
 assert.equal(require('../fixtures/packages/main').ok, 'ok',
              'Failed loading package');
+assert.equal(require('../fixtures/packages/main-index').ok, 'ok',
+             'Failed loading package with index.js in main subdir');
 
 common.debug('test cycles containing a .. path');
 var root = require('../fixtures/cycles/root'),