add support to download a template

lib/cmds/template_generator.js

@@ -0,0 +1,87 @@
+let fs = require('../core/fs.js');
+let utils = require('../utils/utils.js');
+
+class TemplateGenerator {
+  constructor(templateName) {
+    this.templateName = templateName;
+  }
+
+  downloadAndGenerate(uri, destinationFolder, name) {
+    let {url, filePath} = this.getExternalProject(uri);
+    let tmpFilePath = fs.tmpDir(filePath);
+
+    fs.mkdirpSync(utils.dirname(tmpFilePath));
+    utils.downloadFile(url, tmpFilePath, () => {
+      let fspath = utils.joinPath(destinationFolder, name);
+      const decompress = require('decompress');
+
+      decompress(tmpFilePath, fspath, {
+        map: file => {
+          let fixed_path = file.path.split('/');
+          fixed_path.shift(); // remove first directory
+          file.path = utils.joinPath(...fixed_path);
+          return file;
+        }
+      });
+    });
+  }
+
+  generate(destinationFolder, name) {
+    let templatePath = fs.embarkPath(utils.joinPath('templates', this.templateName));
+    console.log(__('Initializing Embark Template....').green);
+    let fspath = utils.joinPath(destinationFolder, name);
+
+    fs.copySync(templatePath, fspath);
+    utils.cd(fspath);
+    utils.sed('package.json', '%APP_NAME%', name);
+
+    if (name === 'embark_demo') {
+      console.log(__('Installing packages...').green);
+      utils.runCmd('npm install');
+    }
+
+    console.log(__('Init complete').green);
+    console.log('\n' + __('App ready at ').green + fspath);
+
+    if (name === 'embark_demo') {
+      console.log('-------------------'.yellow);
+      console.log(__('Next steps:').green);
+      console.log(('-> ' + ('cd ' + fspath).bold.cyan).green);
+      console.log('-> '.green + 'embark run'.bold.cyan);
+      console.log(__('For more info go to http://embark.status.im').green);
+    }
+  }
+
+  getExternalProject(uri) {
+    const constants = require('../constants');
+    const RAW_URL = 'https://github.com/';
+
+    let match = uri.match(
+      /\.[a-z]+\/([-a-zA-Z0-9@:%_+.~#?&\/=]+)/
+    );
+
+    let url, folder;
+
+    if (uri.startsWith('http')) {
+      url = uri + "/archive/master.zip"
+      folder = match[1]
+    } else if (uri.startsWith('github')) {
+      url = "https://" + uri + "/archive/master.zip"
+      folder = match[1]
+    } else if (uri.split('/').length === 2) {
+      url = "https://github.com/" + uri + "/archive/master.zip"
+      folder = uri
+    } else if (uri.indexOf('/') === -1) {
+      url = "https://github.com/embark-framework/embark-" + uri + "-template/archive/master.zip"
+      folder = "embark-framework/embark-" + uri + "-template"
+    }
+
+    return {
+      url,
+      filePath: utils.joinPath(".embark/templates/", folder, "archive.zip")
+    };
+  }
+
+}
+
+module.exports = TemplateGenerator;