slash: optimize screen refresh #13
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Erasing the line and rewriting everything on every change is simple, but works poorly with slow serial speeds and can still create visible refresh artifacts with faster speeds. Rewrite the refresh routine to keep track of the screen cursor and line length and try to refresh fewer bytes. We still need a boolean to force a full reset after we print completion lists. A full buffer reset is also used when browsing the history, which could probably be optimized further. Signed-off-by: Jeppe Ledet-Pedersen <jlp@satlab.com>
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Erasing the line and rewriting everything on every change is simple, but works poorly with slow serial speeds and can still create visible refresh artifacts with faster speeds.
Rewrite the refresh routine to keep track of the screen cursor and line length and try to refresh fewer bytes. We still need a boolean to force a full reset after we print completion lists. A full buffer reset is also used when browsing the history, which could probably be optimized further.