Added "active_window" helper tool (jsc#PM-1895, jsc#SLE-16263)

[lslezak]

• Related to The Installer Console (SLE-16263, SLE-16358) yast-installation#905
• For the GUI console we need to somehow automatically switch between the console window and the YaST installer window.
• Originally I wanted to use the xdotool but that is a generic tool with lots of features and is quite big. It would also add a new dependency. So I wrote a very small single purpose tool.
• Do not ask me for implementation details, I used Google and StackOverflow a lot. 😃 See the links in the source code.

Testing

At first just a simple test, get the WID of the active YaST window, then activate it from the xterm:

Integration into the YaST console, when the configure_network command is finished (the network configuration module is done) then the console (xterm) window is activated and moved to the foreground. Without this tool the user would see "frozen" YaST and need to manually switch via Alt-Tab:

[mvidner]

Thanks!

IIUC activating a nonsensical window id is not an error we can detect, because the X server will not return an error, right?

[lslezak]

Yes, activating a non-existing window is not detected. The error handling is a bit tricky as the request is just queued and it is processed later by the server.

Maybe you can check somehow for the result but as this tool is for a very specific purpose I'd keep it simple.

[yast-bot]

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[yast-bot]

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