John Little wrote:
This is a regression, the syntax/sh.vim from 2019-06-16 does not show
this problem.
The maintainer of this syntax script has his own version numbering,
and if you want to report problems he usually will first ask that you
try the latest script from his web site, which is version 190. It has
the problem. The version on github is 189, dated 2019-10-16. Version
188, which I have from the Ubuntu 20.04 repository, does not show the
problem. (Neither do versions 125, 133, or 179, which I had lying around.)
I see the problem. As you can easily check, putting a space right
before the backslash fixes the highlighting. From syntax highlighting's
perspective:
* something preceded by an even number of backslashes should not be
escaped (and thus be normally highlighted)
* something preceded by an odd number of backslashes should be escaped
(and thus highlighted with special highlighting)
However, in this case the backslash is preceded by the double-quote
which starts a string region. The attempt to check for an odd/even
number of backslashes fails, and thus the backquote is recognized
incorrectly as beginning an in-string command rather than being
escaped. Not checking for that even/odd number of backslashes is
obviously going to cause bad highlighting. I need some way to check
that a pattern is beginning with a backslash in a region, and thus can
do without the odd-even preceding context checking. I've asked Bram for
something like a "startgroup=..." expression (similar to nextgroup=...)
wherein I could do just that.
We'll see what happens...
Chip Campbell
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