Re: [jed-users] whitespace?

[Guenter Milde <milde@xxxxxxxxxxxxxxxxxxxxx>]

On 15.09.16, Ryan Swan wrote:
> Thanks to John E Davis and Roland Hughes for the help with the keycode mode.


> In nano, if I view a .c file, I can see unnecessary whitepace highlighted.

> For example:

> int foo(void)
> {
> 	int x = 1;

> 	return x;
> }

> after the int x = 1; line there is a tab.  Nano will highlight this.

> Can jed?  If so, how?

See for example "diffmode.sl" in http://jedmodes.sf.net/mode/diffmode

The rule is

  dfa_define_highlight_rule("[ \t]+$",       "Qtrailing_whitespace",   mode);

and it requires DFA highlight mode.


BTW: I also have (locally) a function to remove all trailing whitespace:

% Trim buffer but keep multiple blank lines:
public define trim_buffer_lines()
{
   % remove whitespace at end of lines
   push_spot_bob();
   do {
      eol_trim();
   }
   while (down_1());
   % remove empty lines at end of buffer
   eob();
   do {
      go_left_1();
      if (bolp() and eolp())
	 del();
   }
   while (bolp());

   pop_spot();
   !if (BATCH) message ("done.");
}


Günter
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