function (app, callback) {
    var cozyLight = require('./cozy-light');
    logger.info('Fetching data...');
    npmHelpers.fetchManifest(app,
      function addAppToConfig (fetchErr, manifest, type) {

        if (fetchErr) {
          logger.raw(fetchErr);
          logger.error('Cannot find given app manifest.');
          logger.error('Make sure it lives on Github');
          logger.error('or in the given directory.');
          logger.error(app + ' installation failed.');
          nodeHelpers.invoke(callback, fetchErr);

        } else {
          var config = configHelpers.getConfig();
          var appName = manifest.name;

          if (config.apps[appName]) {
            logger.info('App ' + appName + ' already installed...');
            return nodeHelpers.invoke(callback, null, manifest, type);

          } else {
            logger.info('Installing app ' + appName + '...');
            var setupCb = function(installErr){
              if (installErr) {
                logger.raw(installErr);
                logger.error(appName + ' installation failed.');
                nodeHelpers.invoke(callback, installErr, manifest, type);
              } else {
                logger.info(appName + ' installed. Enjoy!');

                if(cozyLight.getStatus() !== 'started') {
                  configHelpers.addApp(appName, manifest);
                  nodeHelpers.invoke(callback, null, manifest, type);
                } else {
                  configHelpers.watcher.one(function() {
                    callback();
                  });
                  configHelpers.addApp(appName, manifest);
                }
              }
            };

            if (type === 'file') {
              return npmHelpers.link(app, setupCb);
            } else if (type === 'url') {
              /* Checking if a branch of the github repo is specified
               * within the application path parameter (separated with a @).
               */
              if (app.split('@') > 1) {
                app = app.split('@')[0];
              }
              return npmHelpers.install(app, setupCb);
            }
          }
        }
      });
  }
function (app, callback) {
    var cozyLight = require('./cozy-light');
    logger.info('Fetching data...');
    npmHelpers.fetchManifest(app,
      function addAppToConfig (fetchErr, manifest, type) {

        if (fetchErr) {
          logger.raw(fetchErr);
          logger.error('Cannot find given app manifest.');
          logger.error('Make sure it lives on Github');
          logger.error('or in the given directory.');
          logger.error(app + ' installation failed.');
          nodeHelpers.invoke(callback, fetchErr);

        } else {
          var config = configHelpers.getConfig();
          var appName = manifest.name;

          if (config.apps[appName]) {
            logger.info('App ' + appName + ' already installed...');
            return nodeHelpers.invoke(callback, null, manifest, type);

          } else {
            logger.info('Installing app ' + appName + '...');
            var setupCb = function(installErr){
              if (installErr) {
                logger.raw(installErr);
                logger.error(appName + ' installation failed.');
                nodeHelpers.invoke(callback, installErr, manifest, type);
              } else {
                logger.info(appName + ' installed. Enjoy!');

                if(cozyLight.getStatus() !== 'started') {
                  configHelpers.addApp(appName, manifest);
                  nodeHelpers.invoke(callback, null, manifest, type);
                } else {
                  configHelpers.watcher.one(function() {
                    callback();
                  });
                  configHelpers.addApp(appName, manifest);
                }
              }
            };

            if (type === 'file') {
              return npmHelpers.link(app, setupCb);
            } else if (type === 'url') {
              
              if (app.split('@') > 1) {
                app = app.split('@')[0];
              }
              return npmHelpers.install(app, setupCb);
            }
          }
        }
      });
  }
function ( app , callback ) { var cozyLight = require ( './cozy-light' ) ; logger . info ( 'Fetching data...' ) ; npmHelpers . fetchManifest ( app , function addAppToConfig ( fetchErr , manifest , type ) { if ( fetchErr ) { logger . raw ( fetchErr ) ; logger . error ( 'Cannot find given app manifest.' ) ; logger . error ( 'Make sure it lives on Github' ) ; logger . error ( 'or in the given directory.' ) ; logger . error ( app + ' installation failed.' ) ; nodeHelpers . invoke ( callback , fetchErr ) ; } else { var config = configHelpers . getConfig ( ) ; var appName = manifest . name ; if ( config . apps [ appName ] ) { logger . info ( 'App ' + appName + ' already installed...' ) ; return nodeHelpers . invoke ( callback , null , manifest , type ) ; } else { logger . info ( 'Installing app ' + appName + '...' ) ; var setupCb = function ( installErr ) { if ( installErr ) { logger . raw ( installErr ) ; logger . error ( appName + ' installation failed.' ) ; nodeHelpers . invoke ( callback , installErr , manifest , type ) ; } else { logger . info ( appName + ' installed. Enjoy!' ) ; if ( cozyLight . getStatus ( ) !== 'started' ) { configHelpers . addApp ( appName , manifest ) ; nodeHelpers . invoke ( callback , null , manifest , type ) ; } else { configHelpers . watcher . one ( function ( ) { callback ( ) ; } ) ; configHelpers . addApp ( appName , manifest ) ; } } } ; if ( type === 'file' ) { return npmHelpers . link ( app , setupCb ) ; } else if ( type === 'url' ) { /* Checking if a branch of the github repo is specified
               * within the application path parameter (separated with a @).
               */ if ( app . split ( '@' ) > 1 ) { app = app . split ( '@' ) [ 0 ] ; } return npmHelpers . install ( app , setupCb ) ; } } } } ) ; }
App names correspond to Github repo.
An app name is composed of a user name
and a repository name.
Installation starts by fetching the manifest
from the repository (package.json located at the root).
Then it installs sources and
dependencies in the cozy-light folder.

@param {String} app App to install (ex: cozy-labs/calendar).
@param {Function} callback Termination.
App names correspond to Github repo . An app name is composed of a user name and a repository name . Installation starts by fetching the manifest from the repository ( package . json located at the root ) . Then it installs sources and dependencies in the cozy - light folder .