[Shish2k]

The line I'd draw is application logic (how the WM acts, how it reacts to user inputs, how it feels to the end user, the unique things which make it different to any other WM) vs library logic (the necessary groundwork which every WM is forced to implement in exactly the same way because of the protocol spec)

tinywl is 500 lines of application logic + 40,000 lines of library logic; compared to your example which is two lines, but doesn't include the application logic, which I think makes it an apples-to-oranges comparison.

[rain1]

his example is 2 lines of application logic + 40,500 lines of library logic

[Shish2k]

I think in your rush to be sarcastic you forgot to read the part where I gave "application logic" and "library logic" some practical definitions :)

To clarify anyway - "tiling vs free-floating" is an application behaviour, "move window from (x1,y1) to (x2,y2)" is a library function; "focus follows mouse vs click-to-focus" is an application behaviour, "set_focus(window_id)" is a library function; "apps have icons vs apps have text labels" is an application behaviour, "render_icon()" and "render_text()" are library functions; etc.

As somebody who is interested in creating my own window manager, because none of the existing ones behave in the way that I want them to, I find the definition used by the author here to be very useful - the 500 lines are what I need to grok in order to build a WM which works in the way I want it to, and the 40,000 lines are what I can just call without needing to care about the internals. (To use parent's 2-line example as a counterexample - grokking those two lines is not sufficient to build the WM of my dreams)