Initial import, published to npm already.

example.js

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+var npmwrapper = require('npm-wrapper').npmwrapper;
+
+var base_path = '/tmp/npm_test_1';
+var root_path = base_path + '/.root_path';
+var binroot_path = base_path + '/.bin_path';
+var manroot_path = base_path + '/.man_path';
+var action = 'install';
+var package = 'express';
+
+var n = new npmwrapper();
+n.setup(root_path, binroot_path, manroot_path, action, package);
+n.run(function (out) {
+  console.log(out);
+});

npm-wrapper.js

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+var npm = require('npm');
+
+var npmwrapper = function () {
+  this.config = {};
+  this.command = "";
+  this.package = "";
+  this.output = "";
+};
+
+npmwrapper.prototype.setup = function (root_path, binroot_path, manroot_path, command, package) {
+  process.env.PATH = binroot_path + ":" + process.env.PATH;
+  this.command = command;
+  this.package = package;
+  this.config = {
+    color: false,
+    root: root_path,
+    binroot: binroot_path,
+    manroot: manroot_path,
+    argv: {
+      remain: [ package ],
+      cooked: [
+        command,
+        package,
+        '--root',
+        root_path,
+        '--binroot',
+        binroot_path,
+        '--manpath',
+        manroot_path
+      ],
+      original: [ ]
+    }
+  };
+  this.config.argv.original = this.config.argv.cooked;
+};
+
+npmwrapper.prototype.run = function (cb) {
+  var self = this;
+  npm.on('output', function (obj) {
+    self.output += obj.message + "\n";
+    npm.output = false;
+  });
+  npm.load(self.config, function (err) {
+    if (err) console.log(err);
+    npm.commands[self.command](self.config.argv.remain, function (err, data) {
+      cb(self.output);
+    });
+  });
+};
+
+exports.npmwrapper = npmwrapper;

package.json

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+{
+  "name": "npm-wrapper",
+  "description": "A dumb class wrapper around npm to make it easy to manage stuff.",
+  "version": "0.0.1",
+  "homepage": "https://github.com/DanBUK/npm-wrapper",
+  "repository": "git://github.com/DanBUK/npm-wrapper.git",
+  "author": "Daniel Bartlett <dan@f-box.org> (https://github.com/DanBUK)",
+  "main": "./npm-wrapper",
+  "directories": {
+    "lib": ""
+  },
+  "engines": {
+    "node": "*"
+  }
+}

readme.txt

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+npm-wrapper
+
+A very dump module to make using npm from scripts a little eaiser.
+
+Please see example.js for how to use.
+
+npmwrapper methods:
+  setup - Setup the job you want to run
+  run - Run the job with a callback with one argument with the output
+
+Installation
+> npm install npm-wrapper