On 24/05/12 9:29 AM, Kartik Agaram wrote:
Lisp symbols can usually contain ':', but I'm using a dialect where
':' is special syntax. I'd like to highlight it like parens.
A) My first attempt was the following:
au BufReadPost *.lisp syntax match Delimiter /:/
(The autocmd is to apply this after any other settings.)
This works on the following file x.lisp:
abc:def
The ':' is highlighted as expected.
B) However, it doesn't work inside lists:
(abc:def)
Now the ':' isn't highlighted.
I used this awesome tip to see what was going on:
http://vim.wikia.com/wiki/Identify_the_syntax_highlighting_group_used_at_the_cursor.
Position cursor on the unhighlighted ':', hit<F10> and it shows me
that it thinks the ':' belongs to lispSymbol.
So I dug into the definition of lispSymbol and updated it to not include ':'
au BufReadPost *.lisp syn clear lispSymbol
au BufReadPost *.lisp syn match lispSymbol contained ![^()'`,"; \t:]\+!
C) Still no dice.<F10> now shows ':' inside lists to be of type
lispList. Turns out I need to tell vim that lispList can contain
Delimiters:
au BufReadPost *.lisp syn cluster lispListCluster add=Delimiter
It works!
D) Now I want to make sure a leading ':' at the start of a symbol *is*
treated as part of the symbol. So we only highlight ':' in the middle
or end of a word.
au BufReadPost *.lisp syn match Delimiter /[^ ]\zs:/
But this again doesn't work inside lists.<F10> shows the ':' is
considered part of lispList just as before I made change (C).
Anybody have any ideas on why? I've attached both the test vimrc and
test x.lisp file. I'm using vim 7.3 and have tested it with the latest
runtime files.
I tried this (I changed the way autocommands were handled so I could
easily source the file multiple times while testing):
augroup Test
au!
au BufReadPost *.lisp call MyLispModifications()
augroup END
func! MyLispModifications()
syn clear lispSymbol
syn match lispSymbol contained !:\?[^()'`,"; \t:]\+!
syn match Delimiter /\(\<\)\@!:/
syn cluster lispListCluster add=Delimiter
endfunc
Note that the ordering of the syn commands is important.
The combination of optionally including : in a symbol, and not
recognising it as a delimiter at the beginning of a word seems to do the
trick for me.
Ben.
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