Re: highlighting let+

On Sun, 22 Jan 2012 14:02:33 +0000, Tim Bradshaw wrote:

On 2012-01-22 13:45:07 +0000, Tamas Papp said:

Hi,

How can I highlight the symbol `let+' in Emacs (SLIME etc, standard
setup)?

I tried

(font-lock-add-keywords nil
'(("let+" . font-lock-keyword-face)))

but the `+' isn't highlighted, only the `let'.

Best,

Tamas

This is really an Emacs question: I don't know if there are still active

You are right, but Emacs is one of the most important IDEs for CL, so
I thought I would try here, because I expect that very few languages
have keywords that have characters like + in them so lispers are most
likely to have run into this problem.

Emacs newsgroups. But I'm guessing that the keyword is a regexp so "+"
is special, and what you've probably defined is a pattern which will
highlight "lett", "lettt" & so on. Probably you want "let\\+" or
"let[+]" or something like that.

Strangely, it is the opposite: in Emacs regexps, + does what you
describe when you escape it.

I have also tried

(font-lock-add-keywords nil
'(("\\<\\(let+\\)" 1 font-lock-keyword-face t)))

which at least doesn't interfere with flet & similar, but the + is
still not highlighted.

Best,

Tamas
.

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