a emacs mode to see newline, tabs, spaces

a emacs mode to see newline, tabs, spaces

[n179911]

Hi,

Is there any way to put emacs in a mode which I can visualize newline,
tab, space?

Thank you.

Re: a emacs mode to see newline, tabs, spaces

[Maurizio Vitale]

>>>>> "n179911" == n179911  <n179911@gmail.com> writes:

    n179911> Hi, Is there any way to put emacs in a mode which I can
    n179911> visualize newline, tab, space?

whitespace.el

-- 

Re: a emacs mode to see newline, tabs, spaces

[Teemu Likonen]

On 2009-08-13 12:10 (-0700), n179911@gmail.com wrote:
> Is there any way to put emacs in a mode which I can visualize newline,
> tab, space?

Yes, there is. Some reading:

    C-h f whitespace-mode RET
    C-h f whitespace-toggle-options RET
    C-h v whitespace-style RET

RE: a emacs mode to see newline, tabs, spaces

[Drew Adams]

> Is there any way to put emacs in a mode which I can visualize newline,
> tab, space?
http://www.emacswiki.org/emacs/ShowWhiteSpace

Re: a emacs mode to see newline, tabs, spaces

[n179911]

Thank you.
I have installed whitespace.el. And I have read
'http://www.emacswiki.org/emacs/download/whitespace.el'

But is there a way to convert a section of the code (not the whole
file) so that all the tab will be 4 spaces?
I tried 'whitespace-cleanup-region', but that does not change anything.

Thank you.


On Thu, Aug 13, 2009 at 12:16 PM, Maurizio
Vitale<mav@cuma.i-did-not-set--mail-host-address--so-tickle-me> wrote:
>>>>>> "n179911" == n179911  <n179911@gmail.com> writes:
>
>    n179911> Hi, Is there any way to put emacs in a mode which I can
>    n179911> visualize newline, tab, space?
>
> whitespace.el
>
> --
>
>
>
>

Re: a emacs mode to see newline, tabs, spaces

[Maurizio Vitale]

>>>>> "n179911" == n179911  <n179911@gmail.com> writes:

    n179911> Thank you.  I have installed whitespace.el. And I have read
    n179911> 'http://www.emacswiki.org/emacs/download/whitespace.el'

    n179911> But is there a way to convert a section of the code (not
    n179911> the whole file) so that all the tab will be 4 spaces?  I
    n179911> tried 'whitespace-cleanup-region', but that does not change
    n179911> anything.

If by this you mean that all tabs are replaced by 4 spaces:

  - set tab-width to 4
  - mark the region of interest
  - M-x untabify

oth,

  Maurizio
-- 

Re: a emacs mode to see newline, tabs, spaces

[Sébastien Vauban]

Hi Drew,

>> Is there any way to put emacs in a mode which I can visualize newline, tab,
>> space?
>
> http://www.emacswiki.org/emacs/ShowWhiteSpace

When highlighting tab characters with the following snippet of code, my Gnus
Group buffer becomes black-and-white only.

--8<---------------cut here---------------start------------->8---
;; highlight tabs
(require 'show-wspace)
(add-hook 'font-lock-mode-hook 'highlight-tabs)
--8<---------------cut here---------------end--------------->8---

Same happens with the following:

--8<---------------cut here---------------start------------->8---
;; highlight tabs in all modes
(add-hook 'font-lock-mode-hook
          '(lambda ()
             (font-lock-add-keywords
              nil
              '(("\t" 0 'trailing-whitespace prepend)))))
--8<---------------cut here---------------end--------------->8---

Any idea why?

Best regards,
  Seb

-- 
Sébastien Vauban

RE: a emacs mode to see newline, tabs, spaces

[Drew Adams]

> >> Is there any way to put emacs in a mode which I can 
> >> visualize newline, tab, space?
> >
> > http://www.emacswiki.org/emacs/ShowWhiteSpace
> 
> When highlighting tab characters with the following snippet 
> of code, my Gnus Group buffer becomes black-and-white only.
> 
> (require 'show-wspace)
> (add-hook 'font-lock-mode-hook 'highlight-tabs)

I know nothing about a function called `highlight-tabs'. The function defined in
show-wspace.el is `show-ws-highlight-tabs'. Is that what you meant (what you
used)?

> Same happens with the following:
> (add-hook 'font-lock-mode-hook
>           '(lambda ()
>              (font-lock-add-keywords
>               nil
>               '(("\t" 0 'trailing-whitespace prepend)))))

Again, I know nothing about `trailing-whitespace'. show-wspace.el defines this
function: `show-ws-highlight-trailing-whitespace'. 

> Any idea why?

I suspect you might be mixing things from two or more different
whitespace-display packages. If you want to use show-wspace.el to show
whitespace, follow the instructions in the file. For example:

(require 'show-wspace)
;; Highlight tabs
(add-hook 'font-lock-mode-hook
 'show-ws-highlight-tabs)
;; Highlight trailing whitespace
(add-hook 'font-lock-mode-hook
 'show-ws-highlight-trailing-whitespace)
;; Highlight non-breaking spaces
(add-hook 'font-lock-mode-hook
 `show-ws-highlight-hard-spaces')

If that approach doesn't work for you, please send me a recipe to reproduce the
problem, starting with `emacs -Q'. I don't use Gnus, so if you can provide a
simpler recipe, that's good.