Bram,
a popular questions at Stackoverflow covers the topic how to display
whitespace distinct so that it is easily visible where whitespace is.
Since starting with Vim 7.3 Concealing became available, my answer to
that problem was this:
,----
| syn match WhiteSpace / / containedin=ALL conceal cchar=ยท
| setl conceallevel=2 concealcursor=nv
`----
That should theoretically match everywhere, but I noticed it doesn't. I
have digged into the syntax highlighting rules and apparently, this is
caused by the "skipwhite" argument in the syntax files. The help however
states this:
,----[ :h syn-skipwhite ]-
| When "skipwhite" is present, the white space is only skipped if there
| is no next group that matches the white space.
`----
So I would argue, that a syntax rule, that has the containedin argument,
should also apply at that space. The patch seems relativly simple:
diff --git a/src/syntax.c b/src/syntax.c
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -2275,12 +2275,14 @@ syn_current_attr(syncing, displaying, ca
* If a nextgroup was not found, continue looking for one
if:
* - this is an empty line and the "skipempty" option was
given
* - we are on white space and the "skipwhite" option was
given
+ * (but allow containedin groups to still match that)
*/
if (!found_match)
{
line = syn_getcurline();
if (((current_next_flags & HL_SKIPWHITE)
- && vim_iswhite(line[current_col]))
+ && vim_iswhite(line[current_col])
+ && !syn_block->b_syn_containedin)
|| ((current_next_flags & HL_SKIPEMPTY)
&& *line == NUL))
break;
Attached is also a screenshot, that shows the difference.
Best,
Christian
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