Command-line options

Other file managers usually accept command-line options. For example, you can specify a folder when launching Windows Explorer. It also responds to various switches. Let's say that you can give it switch /e, and Explorer will open the folder in expanded mode.

NW.js reveals command-line options as an array of strings in nw.App.argv. So, we can change the code of the DirService initialization in the main module:

./js/app.js

const dirService = new DirService( nw.App.argv[ 0 ] );

Now, we can open a specified folder in the File Explorer straight from the command line:

npm start ~/Sandbox

In UNIX-based systems, the tilde means user home directory. The equivalent in Windows will be as follows:

npm start %USERPROFILE%Sandbox

What else can we do? Just for a showcase, I suggest implementing the --minimize and --maximize options that switch the application window mode on startup, respectively: ./js/app.js

const argv = require( "minimist" )( nw.App.argv ), 
         dirService = new DirService...