Command line usage on a headless server triggers error

[heyhippari]

• Ripme version: 1.5.14.r0.g8064772
• Java version: OpenJDK9
• Operating system: Linux 4.13.4
• Exact URL you were trying to rip when the problem occurred: none
• Please include any additional information about how to reproduce the problem: Launch ripme in a terminal on a machine without a graphical server.

Expected Behavior

The app should simply return an help page if no argument is passed, otherwise it should run the operation as intended.

Actual Behavior

The app refuses to do anything and outputs the following error:

Exception in thread "main" java.awt.HeadlessException: No X11 DISPLAY variable was set, but this program performed an operation which requires it. at java.desktop/java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:202) at java.desktop/java.awt.Window.(Window.java:534) at java.desktop/java.awt.Frame.(Frame.java:423) at java.desktop/javax.swing.JFrame.(JFrame.java:224) at com.rarchives.ripme.ui.MainWindow.(MainWindow.java:162) at com.rarchives.ripme.App.main(App.java:60)

[cyian-1756]

The app should simply return an help page if no argument is passed

The issue here is that ripme considers no args being passed as GUI mode

[metaprime]

The only interactive mode ripme has is the GUI, so why would you want to run it from a console with no args?

[heyhippari]

It'd be nice to get instructions on how to use it if you're on headless, instead of the current behavior of simply throwing an exception and quitting.

I might tackle this this weekend.
I've found out about the following piece of code, which could achieve what I want:

if (GraphicsEnvironment.isHeadless()) {
     // redirect to the command line options, if no option is supplied, show an help page
} else {
     // start the gui
}

I'm mostly running it headless through a Systemd Timer for automated ripping of a list of URLs, but still, it's a "nice to have" for cleanliness on the end-user part :)