Hello,
While editing Scheme code with the Lisp mode enabled (:set lisp), I
have noticed that the command % does not work with parentheses inside
single line comments. This is good, since you might have just one
parenthesis in a commented line and you don't want it to mess up the
matching of parentheses in the source code.
But vim has a problem when you use an S-expression comment, a style of
comment defined in the Scheme extension SRFI-62 (http://
srfi.schemers.org/srfi-62/srfi-62.html). It's a straightforward way to
comment a whole expression in Scheme, without the need of commenting
every line. For example, with S-expression comments, you can do this:
(this is #;(some s-expression
with a commented (expression)))
Instead of this:
(this is ;(some s-expression
;with a commented (expression))
)
Both excerpts will result in the following expression:
(this is)
If you position the cursor on the parenthesis right after the '#;'
token and press the key %, Vim won't recognize it as a match and will
mess up the matching of other parentheses. This is because Vim thinks
the parenthesis is inside a comment line, while in fact it is not
(note that '#;' does *not* produce a comment line, while ';' alone
does).
So I went ahead and tried to find the source of this inconvenience and
fix the code. I created a patch and I'm posting it here.
I also wondered if this might affect Common Lisp code somehow, but a
line like "#;is this a comment line?" seems to be invalid and triggers
an error in CLISP.
I hope this might be useful.
Alonso
--- search.c (revision 1586)
+++ search.c (working copy)
@@ -2400,8 +2400,10 @@
&& *(p - 1) != '\\' && *(p - 2) != '#'))
instr = TRUE;
}
- else if (!instr && ((p - line) < 2
- || (*(p - 1) != '\\' && *(p - 2) != '#')))
+ else if (!instr
+ && ((p - line) < 1 || *(p - 1) != '#')
+ && ((p - line) < 2
+ || (*(p - 1) != '\\' && *(p - 2) != '#')))
break; /* found! */
++p;
}
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