Re: Line numbers and Visible Tabs

[Tom Culliton <culliton@xxxxxx>]

I was thinking more along the lines of trivially adding a couple of
whitespace entries (say "space" and "tab") to Color_Name_Map from
colors.c using the provided intrinsic function "add_color_object".  
Then you could have the syntax modes use them.  I'd do more research on
the details but I've got a bad case of "just back from vacation desk".

John can probably say of the top of his head how viable this idea is...

On Mon, 29 Sep 2003 23:59:14 +0200 Klaus Schmid wrote:
> On September 28, 2003 6:26 PM, Robert Lillack" <rob@xxxxxxxxxx> wrote
> 
> > It occurs to me that a really nice and relatively straightforward way of
> > doing this would be to use syntax coloring to show the whitespace ...
> > Obviously it would be the background color that would be the key.  With
> > color you could make the distinction very subtle.  For example by making
> > the background just enough more/less red or green or blue to be obvious.
> > 
> > This would be even better if you could set it in an additive way, so
> > that you could turn it on and off like a sub-mode.  However given that
> > it could be kept very subtle, you could probably leave it on all the
> > time without distraction or annoyance so that's not a big deal...
> 
> Some time ago I posted a small script to colorize spaces and tabs by
> abusing some syntax-functions. This abusing has one drawback: the
> colorized items in other buffers are affected by this. To avoid this, we
> would need some additional syntax/color-objects, which are meant to
> be used only for this purpose.
> 
> The following script is a rudimentary binary-mode, which needs
> only two syntax/color-objects: one for control-chars including tab
> and the other for ordinary text-chars including space. Maybe this
> minimum approach can satisfy most.
> 
> As it is, bin_mode has to be issued a second time on the same
> buffer to remove the side effects on syntax-colors in other mode-buffers.
> To make it  more pleasant, bin_mode tries additionally to reset
> the mode which was active before. Yet not elaborated:
> useful key-bindings, e.g. goto byte-offset instead of goto line,
> combination with find_binary_file and any file-extensions.
> 
> % binmode.sl
> static variable M= "bin";
> 
> if (not keymap_p( M)) copy_keymap( M, "global");
> 
> create_syntax_table(M);
> {
>    variable s="", i;
>    
>    for (i=1;i<32;i++) s+= char(i);
>    
>    % text- and control-chars
>    define_syntax( "\d032-\d999",  '0', M); % number
>    define_syntax( s,              '+', M); % operator
> }
> 
> public define bin_mode()
> {
>    variable m;
>    
>    if ((what_mode(),pop()) == M)
>      {
>         ()= evalfile( _Jed_Color_Scheme);
>         @__get_reference( get_blocal_var( M));
>         return;
>      }
>    
>    m= strlow((what_mode(),pop()))+"_mode";
>    if ( __get_reference( m) == NULL) m= "no_mode";
>    create_blocal_var( M);
>    set_blocal_var( m, M);
>         
>    set_mode( M, 0);
>    use_keymap( M);
>    use_syntax_table( M);
>    
>    % colorize text- and control-chars
>    set_color( "number", get_color( "string"));
>    set_color( "operator", get_color( "comment"));
>    
>    run_mode_hooks( M+"_mode_hook");
> }
> 
> 
> -- Klaus
> 
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