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For some reason porting the termbox-go implementation was still leaving
some gunk from git on screen when I ran my usual test:
$ mkdir lesson; cd lesson; git init; mu edit.mu
Then hit F4, generating messages from git on the initial commit.
Then hit ctrl-l to clear all git gunk.
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Mu still isn't so optimized that I can be profligate with spare cycles.
Instead we'll follow termbox-go's example and create a new API routine
called tb_sync() (after discussion with termbox's author). Now we only
need use tb_sync() on ctrl-l. For everything else use the optimized
render.
Now I think I've eradicated all signs of "cursor thrashing" during
refresh, in spite of how slow mu is as an interpreted language. We only
render the whole screen in some situations, and only if there's no more
input, and even then we only refresh the parts of the screen that
changed.
Thanks Jack and Caleb Couch for providing the impetus behind commits
2109-2113.
I've been lazy about writing tests for all this, but it's still good to
know I could, if I wanted to.
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Termbox had been taking shortcuts when it thinks the screen hasn't
changed, which doesn't work if some other process messes up the screen.
The Go version has a Sync method in addition to Flush/tb_present for
precisely this eventuality. But it feels like an unnecessary
optimization given C's general speed. Just drop it altogether.
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This took me a long time to track down, and interestingly I found myself
writing a new tracing primitive before I remembered how to selectively
trace just certain layers during manual tests. I'm scared of generating
traces not because of performance but because of the visual noise. Be
aware of this. I'm going to clean up $log now.
Maybe I should also stop using $print..
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It took me a long time to fix termbox because the escape codes it was
seeing seemed all wrong. Had to stop calling tb_shutdown/printf and put
in the extra 3 lines to log to a file. Then everything cleared up.
Weird.
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The trick is to check for more events and not bother rendering if so.
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Also a bugfix in break to label, because I noticed the screen wasn't
being cleaned up on quit.
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Lots mixed into this commit:
some off-by-one errors in display.cc
a new transform to translate jump labels that I'd somehow never gotten around to supporting
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I've tried to update the Readme, but there are at least a couple of issues.
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