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The gui script

Location:

On a default pi-apps installation, you will find this script at /home/pi/pi-apps/gui.

Purpose:

This script handles Pi-Apps's entire user-interface.

Usage:

To run Pi-Apps:

~/pi-apps/gui

To start Pi-Apps at a specific app:

~/pi-apps/gui Arduino

To start Pi-Apps on a specific category:

~/pi-apps/gui 'All Apps/'

How it works:

  1. The splash screen appears.
  2. The api script is sourced.
  3. The pi-apps logo is displayed in the terminal (using the generate_logo function)
  4. A series of runonce entries are executed in the background.
  5. The message of the day is determined.
    • To save time, it's stored in data/announcements.
    • If that file is missing or it's more than a day old, it is downloaded from the pi-apps-announcements repository.
    • One random line is taken from the file and used as the message for this session.
  6. We now come to a while loop that runs the GUI. Inside is an if statement that obeys the following values of the $action variable:
    • main-window - Handles the app list.
    • This may be a yad window or an xlunch window, depending on the "App List Style" setting.
    • Xlunch is compiled, if necessary.
    • details - Displays the details of the current app.
    • search - Sets the $app variable to the output of the app_search_gui function.
    • The rest of the modes need no explanation. They are: exit, back, install, uninstall, scripts, edit, credits, enable, viewlog, mind-reading, view-updates, unknown.