Re: 'list', :list, and 'listchars'

Christian Brabandt wrote:

> On Sat, January 29, 2011 10:59 am, Andy Wokula wrote:
> > Am 26.01.2011 18:41, schrieb Ben Fritz:
> >>> From looking at :list, it seems like it's basically supposed to print
> >> the line as it would show with 'list' turned on. However, I have a few
> >> questions:
> >>
> >> :help :list says it will use '^' for unprintable characters, and
> >> additionally says "This can be changed with the 'listchars' option.
> >> However, there does not seem to be any 'listchars' option controlling
> >> the display of unprintable characters. What does setting 'list' do for
> >> unprintable characters? Anything?
> >>
> >> :help :list only mentions EOL and unprintable behavior, but
> >> experimentation shows that "trail", "extends", and "tab" also apply
> >> from 'listchars'. "precedes" and "extends" certainly would not make
> >> sense in this context, but what about "nbsp" and "conceal"?
> >> Experimentation shows that these two options do not have any effect.
> >> Should they? I could understand "conceal" having no effect, but I
> >> would certainly expect "nbsp" to apply, since "trail", etc. all apply.
> >
> > Unprintable characters basically are control characters
> > :h 'isprint
> > Tab is a control character - when 'listchars' does not include
> > 'tab:xy', then tab will be printed as '^I'.
> >
> > "nbsp" was added recently, maybe just forgotten to be implemented for
> > :list ...
> > :list is such a rarely used command ...
>
> Here is a patch, that adds nbsp support to :list command. I leave out
> conceal, as I don't think this makes sense here:
>
> diff --git a/src/message.c b/src/message.c
> --- a/src/message.c
> +++ b/src/message.c
> @@ -1637,8 +1637,18 @@
> else if (has_mbyte && (l = (*mb_ptr2len)(s)) > 1)
> {
> col += (*mb_ptr2cells)(s);
> - mch_memmove(buf, s, (size_t)l);
> - buf[l] = NUL;
> + if (mb_ptr2char(s) == 160 && list && lcs_nbsp != NUL)
> + {
> + int ll=0;
> + mb_char2bytes(lcs_nbsp, buf);
> + ll=(*mb_ptr2len)(buf);
> + buf[ll] = NUL;
> + }
> + else
> + {
> + mch_memmove(buf, s, (size_t)l);
> + buf[l] = NUL;
> + }
> msg_puts(buf);
> s += l;
> continue;

That only works when 'enc' is a multi-byte encoding. It should also
work for latin1.

Please insert spaces around "=". You don't actually need the "ll"
variable.

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