add files

Author: 淘杰

index.js

@@ -0,0 +1,144 @@
+var Module = require('module'),
+    assert = require('assert').ok,
+    fs = require('fs'),
+    path = require('path');
+
+var moduleCache = {},
+    options;
+
+function hasOwnProperty(obj, prop) {
+  return Object.prototype.hasOwnProperty.call(obj, prop);
+}
+
+function statPath(path) {
+  try {
+    return fs.statSync(path);
+  } catch (ex) {}
+  return false;
+}
+
+// check if the directory is a package.json dir
+var packageMainCache = {};
+
+function readPackage(requestPath) {
+  if (hasOwnProperty(packageMainCache, requestPath)) {
+    return packageMainCache[requestPath];
+  }
+
+  try {
+    var jsonPath = path.resolve(requestPath, 'package.json');
+    var json = fs.readFileSync(jsonPath, 'utf8');
+  } catch (e) {
+    return false;
+  }
+
+  try {
+    var pkg = packageMainCache[requestPath] = JSON.parse(json);
+  } catch (e) {
+    e.path = jsonPath;
+    e.message = 'Error parsing ' + jsonPath + ': ' + e.message;
+    throw e;
+  }
+  return pkg;
+}
+
+function tryPackage(requestPath, exts) {
+  var pkg = readPackage(requestPath);
+
+  if (!(pkg && pkg.main)) return false;
+
+  var name = pkg.name,
+      version = pkg.version,
+      main = pkg.main;
+
+  var cache = moduleCache[name];
+  if(!cache){
+    cache = moduleCache[name] = {};
+  }
+
+  var filename =  cache[version];
+
+  if(!filename) {
+     filename = path.resolve(requestPath, main);
+     cache[version] = filename;
+  }
+
+  return tryFile(filename) || tryExtensions(filename, exts) ||
+         tryExtensions(path.resolve(filename, 'index'), exts);
+}
+
+
+// check if the file exists and is not a directory
+function tryFile(requestPath) {
+  var stats = statPath(requestPath);
+  if (stats && !stats.isDirectory()) {
+    return fs.realpathSync(requestPath, Module._realpathCache);
+  }
+  return false;
+}
+
+// given a path check a the file exists with any of the set extensions
+function tryExtensions(p, exts) {
+  for (var i = 0, EL = exts.length; i < EL; i++) {
+    var filename = tryFile(p + exts[i]);
+
+    if (filename) {
+      return filename;
+    }
+  }
+  return false;
+}
+
+module.exports = {
+    init: function(_options){
+              if(options) {
+                return;
+              }
+              options = _options||{};
+              Module._findPath = function(request, paths) {
+                var exts = Object.keys(Module._extensions);
+
+                if (request.charAt(0) === '/') {
+                  paths = [''];
+                }
+
+                var trailingSlash = (request.slice(-1) === '/');
+
+                var cacheKey = JSON.stringify({request: request, paths: paths});
+                if (Module._pathCache[cacheKey]) {
+                  return Module._pathCache[cacheKey];
+                }
+
+                // For each path
+                for (var i = 0, PL = paths.length; i < PL; i++) {
+                  var basePath = path.resolve(paths[i], request);
+                  var filename;
+
+                  if (!trailingSlash) {
+                    // try to join the request to the path
+                    filename = tryFile(basePath);
+
+                    if (!filename && !trailingSlash) {
+                      // try it with each of the extensions
+                      filename = tryExtensions(basePath, exts);
+                    }
+                  }
+
+                  if (!filename) {
+                    filename = tryPackage(basePath, exts);
+                  }
+
+                  if (!filename) {
+                    filename = tryExtensions(path.resolve(basePath, 'index'), exts);
+                  }
+
+                  if (filename) {
+                    Module._pathCache[cacheKey] = filename;
+                    return filename;
+                  }
+                }
+                return false;
+              };
+          },
+    moduleCache: moduleCache
+}

package.json

@@ -0,0 +1,11 @@
+{
+  "name": "module-unique",
+  "version": "1.0.1",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC"
+}