Displaying TABS vs SPACES

Displaying TABS vs SPACES

[exits funnel]

Hello,

I'm trying to find a way to distinguish tabs from
consecutive spaces in some source code I've inherited
so I can get the formatting straightened out, but I
can't figure out how.  I'm sure there must be a mode
which allows me to distinguish the two.  If anyone
could point me in the right direction I'd really
appreciate it.

-exits


	
		
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Re: Displaying TABS vs SPACES

[Micha Feigin]

On Wed, Jun 02, 2004 at 08:08:00PM -0700, exits funnel wrote:
> Hello,
> 
> I'm trying to find a way to distinguish tabs from
> consecutive spaces in some source code I've inherited
> so I can get the formatting straightened out, but I
> can't figure out how.  I'm sure there must be a mode
> which allows me to distinguish the two.  If anyone
> could point me in the right direction I'd really
> appreciate it.
> 

I am not sure if it depends on the themes package I'm using (I don't
think so) but the following entry displays tabs and trailing spaces for
me in a different color (same one in my case but you can change that).

(custom-set-faces
 '(my-tab-face            ((((class color)) (:background "gray5"))) t)
 '(my-trailing-space-face ((((class color)) (:background "gray5"))) t))

> -exits
> 
> 
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Re: Displaying TABS vs SPACES

[Micha Feigin]

On Wed, Jun 02, 2004 at 08:08:00PM -0700, exits funnel wrote:
> Hello,
> 
> I'm trying to find a way to distinguish tabs from
> consecutive spaces in some source code I've inherited
> so I can get the formatting straightened out, but I
> can't figure out how.  I'm sure there must be a mode
> which allows me to distinguish the two.  If anyone
> could point me in the right direction I'd really
> appreciate it.
> 

I forgot the fontlock entry, this is the full entry:

(custom-set-faces
 '(my-tab-face            ((((class color)) (:background "gray10"))) t)
 '(my-trailing-space-face ((((class color)) (:background "gray10"))) t))

(add-hook 'font-lock-mode-hook
  (function
    (lambda ()
      (setq font-lock-keywords
            (append font-lock-keywords
                    '(("\t+" (0 'my-tab-face t))
                      ("[ \t]+$" (0 'my-trailing-space-face t))))))))


> -exits
> 
> 
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Re: Displaying TABS vs SPACES

[Kevin Dziulko]

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I'm not sure if there's a mode, but if your looking to convert tabs to spaces or vice versa, there are a number of methods and tools to help you.  Regular expressions will help, for example to replace tabs with spaces:
M-x replace-regexp <RET>
press TAB key <RET>
press SPACE BAR desired number of times <RET>
 
Also, C-x, h to mark buffer, then M-C-\ to indent all lines according to your style might help.

exits funnel <exitsfunnel@yahoo.com> wrote:
Hello,

I'm trying to find a way to distinguish tabs from
consecutive spaces in some source code I've inherited
so I can get the formatting straightened out, but I
can't figure out how. I'm sure there must be a mode
which allows me to distinguish the two. If anyone
could point me in the right direction I'd really
appreciate it.

-exits




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Re: Displaying TABS vs SPACES

[Kai Grossjohann]

exits funnel <exitsfunnel@yahoo.com> writes:

> I'm trying to find a way to distinguish tabs from
> consecutive spaces in some source code I've inherited
> so I can get the formatting straightened out, but I
> can't figure out how.  I'm sure there must be a mode
> which allows me to distinguish the two.  If anyone
> could point me in the right direction I'd really
> appreciate it.

You can do C-x h M-x untabify RET to convert all tabs into the right
number of spaces, or C-x h M-x tabify RET to convert all whitespace
into the shortest tab/space combination.

You can do M-x set-variable RET tab-width RET before that to specify
the width of a tab.

Does this help?

Kai

PS: I thought that M-x whitespace-buffer RET would do useful things,
but it seems it does not do that in this context.  Nevertheless, it's
a cool thing, so perhaps try it.

Re: Displaying TABS vs SPACES

[exits funnel]

> I forgot the fontlock entry, this is the full entry:
> 
> (custom-set-faces
>  '(my-tab-face            ((((class color))
> (:background "gray10"))) t)
>  '(my-trailing-space-face ((((class color))
> (:background "gray10"))) t))
> 
> (add-hook 'font-lock-mode-hook
>   (function
>     (lambda ()
>       (setq font-lock-keywords
>             (append font-lock-keywords
>                     '(("\t+" (0 'my-tab-face t))
>                       ("[ \t]+$" (0
> 'my-trailing-space-face t))))))))

Hey Micha,

I'm finally back to this problem.  I added your code
and it did something, but not what I'd hoped :) 
Initially both cases showed up as black which didn't
surprise me.  However I then changed 'gray10' in the
tab-face to 'red10' but still both spaces and tabs
were showing up as black squares.  My immediate
problem is solved as I ended up using hexl-mode which
isn't too user friendly but does allow me to
differentiate the two.  A quick question though:  How
could I discover what allowable values I could use
other than 'gray10?'  I'm pretty new to emacs.  I read
the doc for custom-set-faces but it left me confused. 
Thanks for taking the time to respond.

-exits


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Re: Displaying TABS vs SPACES

[exits funnel]

--- Kai Grossjohann <kai@emptydomain.de> wrote:
> exits funnel <exitsfunnel@yahoo.com> writes:
> 
> > I'm trying to find a way to distinguish tabs from
> > consecutive spaces in some source code I've
> inherited
> > so I can get the formatting straightened out, but
> I
> > can't figure out how.  I'm sure there must be a
> mode
> > which allows me to distinguish the two.  If anyone
> > could point me in the right direction I'd really
> > appreciate it.
> 
> You can do C-x h M-x untabify RET to convert all
> tabs into the right
> number of spaces, or C-x h M-x tabify RET to convert
> all whitespace
> into the shortest tab/space combination.
> 
> You can do M-x set-variable RET tab-width RET before
> that to specify
> the width of a tab.
> 
> Does this help?

Not really :)  It's okay though; I ended up using
hexl-mode which satisfied my needs.  I'm surprised
this is so hard in EMACS.  Thanks for taking the time
to reply.

-exits



	
		
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Re: Displaying TABS vs SPACES

[Jim Marshall]

exits funnel <exitsfunnel@yahoo.com> writes:

>
> Hey Micha,
>
> I'm finally back to this problem.  I added your code
> and it did something, but not what I'd hoped :) 

You might want to try "blank-mode":
http://www.cpqd.com.br/~vinicius/emacs/#blank-mode.el

>  A quick question though: How could I discover what allowable values
> I could use other than 'gray10?'

Try M-x list-colors-display RET

Re: Displaying TABS vs SPACES

[Micha Feigin]

On Wed, Jun 09, 2004 at 05:11:44PM -0700, exits funnel wrote:
> 
> > I forgot the fontlock entry, this is the full entry:
> > 
> > (custom-set-faces
> >  '(my-tab-face            ((((class color))
> > (:background "gray10"))) t)
> >  '(my-trailing-space-face ((((class color))
> > (:background "gray10"))) t))
> > 
> > (add-hook 'font-lock-mode-hook
> >   (function
> >     (lambda ()
> >       (setq font-lock-keywords
> >             (append font-lock-keywords
> >                     '(("\t+" (0 'my-tab-face t))
> >                       ("[ \t]+$" (0
> > 'my-trailing-space-face t))))))))
> 
> Hey Micha,
> 
> I'm finally back to this problem.  I added your code
> and it did something, but not what I'd hoped :) 
> Initially both cases showed up as black which didn't
> surprise me.  However I then changed 'gray10' in the
> tab-face to 'red10' but still both spaces and tabs
> were showing up as black squares.  My immediate
> problem is solved as I ended up using hexl-mode which
> isn't too user friendly but does allow me to
> differentiate the two.  A quick question though:  How
> could I discover what allowable values I could use
> other than 'gray10?'  I'm pretty new to emacs.  I read

See the next email for a probably better reference. but as a guideline
AFAIK the numbers are only available for gray and I think in jumps of 5
(maybe 10 for the middle ones), other colors you can specify by name
some of them have a dark version, so try red and darkred. another
option is to give the numerical representation. Its in hex values and
is of the form #123456 the first two numbers are for red, second two
for green and last two for blue, so dark red will probably be #100000

(custom-set-faces
 '(my-tab-face            ((((class color)) (:background "#100000"))) t)
 '(my-trailing-space-face ((((class color)) (:background "gray5"))) t))

You may need to take the last \t out in the code if you want trailing
tabs to show in red also (just noticed it, didn't have time to check).

> the doc for custom-set-faces but it left me confused. 
> Thanks for taking the time to respond.
> 
> -exits
> 
> 
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RE: Displaying TABS vs SPACES

[Drew Adams]

Here's another you can try:

http://www.emacswiki.org/elisp/show-wspace.el - commands to highlight
whitespace: TABs only, hard spaces only, and all trailing whitespace.

Each uses a different highlight color, so you can highlight, for instance,
both trailing whitespace and TABs, so trailing TABs are distiguished from
trailing spaces.

 - Drew


exits funnel <exitsfunnel@yahoo.com> writes:
> I'm trying to find a way to distinguish tabs from
> consecutive spaces in some source code

RE: Displaying TABS vs SPACES

[Drew Adams]

BTW, Here's a tip regarding trailing whitespace:

A simple way to remove all trailing whitespace is this:

 1. Enter picture mode:  M-x picture-mode
 2. Exit picture mode:   C-c C-c

The only side effect of this is that all trailing whitespace is removed.

I discovered this odd (and undocumented?) "feature" by accident about 20
years ago. So, it has been around since about version 18 of GNU Emacs -
perhaps it's even older.

 - Drew