Ben Fritz wrote:
> I am a big fan of the ability to create folding right in the syntax
> files. What better place to define folding based on the syntax of the
> file, than right in the syntax file? I sometimes find myself wishing
> that I could do the same thing to define _indentation_ based on the
> syntax of the file. Why not create the ability to do something like
> this:
>
> syntax region braceIndent start="{" end="}" transparent indent
>
> This would work exactly the same way for indentation as the example
> given in :help :syn-fold works for folding. I.e. it would increase the
> indent level by one shiftwidth at the start region, and decrease it
> again at the end region (the example would need to be tweaked to
> offset it by a line, or the line-offsets could be built-in).
>
> Unlike syn-fold, however, it would make sense to also allow syn-indent
> within a syn-match. The behavior on a match would be slightly
> different though, because it should not decrease the indent again
> after the match.
>
> This feature would prevent the need to write a complicated indentexpr
> that probably looks at many of the same things that the syntax file
> already looks at.
>
> If this was implemented, a new 'indentmethod' option would probably
> need to be introduced similar to 'foldmethod', with at least 'expr'
> and 'syntax' values defined. It could be nice to have it over-ride all
> the other indent options as well, additionally defining 'auto',
> 'smart', 'c-style' and any other I missed.
>
> What do people think?
>
> Sorry if this has already been suggested...I briefly searched this
> mailing list and didn't find anything, but that's the only place I
> looked.
This only takes care of one kind of indenting, the one for a code block.
Indenting is generally much more complicated and can't be defined with
syntax items.
The way some indent scripts work is to check the syntax items in the
current line. The recently added synstack() function makes this a lot
simpler.
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