[Toybox] [PATCH] vi: fix recent changes.

enh enh at google.com
Wed Jan 12 12:10:49 PST 2022

On Wed, Jan 12, 2022 at 12:05 PM Rob Landley <rob at landley.net> wrote:
> On 1/10/22 9:07 PM, enh via Toybox wrote:
> > vi was segfaulting because some of the printf() arguments were the wrong
> > way round. The file content also wasn't getting displayed because [%dH
> > isn't a correct translation of tty_jump(0, y). Personally, although I
> > agree that tty_esc() wasn't pulling its weight, I think that tty_jump()
> > was: the escape sequence's arguments are the wrong way round, they're
> > both off-by-one, and the rules for the short forms don't make sense to
> > humans, just to 1970s hardware.
> Yeah, I've been unsure about that. I blogged about it at the time:
>   https://landley.net/notes-2022.html#01-01-2022
> But just now got my blog editing/uploading caught up that far. :)
> The motivation for puttering around here is A) fixing microcom so it doesn't
> screw up tabs by getting raw mode wrong, B) implementing command editing/history
> for the shell.
> The problem I hit _here_ is I keep forgetting other people use stuff out of
> pending, and haven't got good tests for vi so didn't bother to test it.
> I'm not sure _how_ to test vi in any sort of automated fashion? First time I sat
> down to try it, the code barfed trying to edit an empty file, so it didn't
> exactly strike me as load bearing yet...
> Trying it now editing the README, when you cursor up and down it jumps to the
> left edge of the file.

yeah, that's not a new bug --- that was true before your recent changes.

> I cursored to the middle of a line, hit "insert" and
> typed the word "potato", then hit cursor down and the new word I'd added jumped
> to the left edge of that line and followed my cursor down multipline lines. When
> I hit "esc" to exit insert mode, the word potato stayed there but I dunno if
> that was a display glitch or where it decided to update the state? (I exited
> without saving.)

hmm, i can't repro that. maybe terminal specific? (probably worth
saving to confirm that it really is just a display issue.)

> Again, promoting this out of pending is going to involve going over every corner
> case in the thing with a jewler's loupe. What's currently there is... unfinished.

definitely, but "some editor is better than no editor" :-)

> Rob

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