The blank-mode.el (attached in this email) now has the toggle funs:

    blank-toggle
    blank-toggle-global

If it's called interactively, it reads a char.

If it's called non-interactively, it should be passed a symbol or a list 
of symbols.

Please, read the fun docstring.


Juri Linkov wrote:
>>>> So, if blank-toggle is binded to a key, for example, C-c b, then the
>>>> user could
>>>> type:
>>>>
>>>>    C-c b t      toggle tabs
>>>>    C-c b s      toggle spaces and hard spaces
>>>>    C-c b r      toggle trailing blanks
>>>>    C-c b b      toggle spaces before tab
>>>>    C-c b l      toggle lines
>>> I like the idea (and blank-mode in general),
>
> I like this package too, and I have some suggestions: since it implements
> a minor mode I suggest defining it with `define-minor-mode', and name the
> global mode `global-blank-mode'.

Well, I'll try to use define-minor-mode in the next blank-mode version.

Is there some convention (or consensus) about global mode name?


> Also I have a question how it interacts with nobreak-char-display.
> Does your package overwrite highlighting of nobreak space displayed
> by nobreak-char-display feature, or ignores it?

I've made some tests and both blank-mode faces and display table are 
displayed when blank-mode is on and nobreak-char-display is t.

When blank-mode is turned off and nobreak-char-display is t, the 
nobreak-char-display faces and display table are displayed.

That is, blank-mode have precedence over nobreak-char-display but only 
over hard spaces (or nobreak spaces), the soft hyphens is handled only 
by nobreak-char-display.

The same occurs with show-trailing-whitespace feature.


>>> but according to the
>>> Emacs Lisp reference, C-c b is reserved for major modes:
>>>
>>>    The key sequences bound in a minor mode should consist of `C-c'
>>> followed by one of `.,/?`'"[]\|~!#$%^&*()-_+='.  (The other punctuation
>>> characters are reserved for major modes.)
>> No problem, the key binding above was only an example, it could be any
>> other key binding.
>
> I think a key prefix with good mnemonics for blank-minor-mode is `C-c _'.

Cool!

At moment blank-mode doesn't have any key binding, this is left to the 
user do.

But I'll put a tip in blank-mode documentation suggesting the key prefix 
`C-c _'.