Re: syn region question

On Sat, 14 Aug 2010, Jeri Raye wrote:

> Hi Ben,
>
> On Fri, Aug 13, 2010 at 8:45 PM, Benjamin R. Haskell wrote:
> > The attached file seems to do what you want, [...]
> >
> > [...] For some insight into how it works, do:
> > :echo orig_syntax
> when I type :echo original_syntax then I noticed that entity is still
> reported in the vhdlStatement list.
>
> Then I've modified the line of block_words into
> let block_keywords = [ 'if', 'else', 'entity', 'zab', 'end' , 'inout' , 'bar']
> Then give the same command again :echo original_syntax
>
> Then also end and inout are still in the list.

You left out the second instruction...

:echo orig_syntax
:syn list vhdlStatement

The ':echo' gives you the original syntax entry for vhdlStatement.
The ':syn' command gives you the current entry.

(So you can compare them.)

> It also says that only if and else are in the match group. At least
> that's my understanding of the lines that comes after all the vhdl
> keywords
> match /\<\(if\|else\)\>/
> links to statement
>
> zab and bar are now highlighted as vhdl keywords

Right. But they aren't listed in that :echo orig_syntax, are they?
(They shouldn't be -- they were added to the new list.)

> > Essentially, the file gets the original vhdlStatement list of
> > keywords, and recreates it, filtering out the keywords you want to
> > use as folding block indicators.  (The attached file uses the list:
> > 'if', 'else', 'entity', and 'zab'.  You should be able to modify
> > block_keywords to whatever you want.)
> >
> > Then it does two things: one is to fill in the answer to your
> > question above.  Instead of creating the individual matches/regions
> > 'vhdlFoo', 'vhdlBar', and 'vhdlFooBarFold', it just adds them as
> > matches in vhdlStatement, and adds the single region
> > 'vhdlBlockFold':
> >
> The folding of code starting with if or entity or else or zab doesn't
> happen.

You also have to set foldmethod=syntax. Sorry, probably could've added
it to that file:

:set fdm=syntax

--
Best,
Ben

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