* Calling Ediff which ignores whitespaces from VC Dir
@ 2013-08-01 14:28 Sebastien Vauban
2013-08-01 15:37 ` Stefan Monnier
[not found] ` <mailman.2315.1375371479.12400.help-gnu-emacs@gnu.org>
0 siblings, 2 replies; 4+ messages in thread
From: Sebastien Vauban @ 2013-08-01 14:28 UTC (permalink / raw)
To: help-gnu-emacs-mXXj517/zsQ
Hello,
I'm trying to call my version of `vc-diff' from VC Dir. It simply is a wrapper
above `vc-diff' where I enforce the fact that whitespaces must be ignored.
I thought this would make it:
--8<---------------cut here---------------start------------->8---
;; hide up-to-date and unregistered files
(add-hook 'vc-dir-mode-hook
(lambda ()
(define-key vc-dir-mode-map
(kbd "E") 'vc-ediff-ignore-whitespace)))
(defun vc-ediff-ignore-whitespace ()
"Ignore regions that differ in white space & line breaks only."
(interactive)
(let ((ediff-ignore-similar-regions t))
(vc-ediff)))
--8<---------------cut here---------------end--------------->8---
but I always get the error:
--8<---------------cut here---------------start------------->8---
Debugger entered--Lisp error: (wrong-number-of-arguments (1 . 2) 0)
vc-ediff()
(let ((ediff-ignore-similar-regions t)) (vc-ediff))
vc-ediff-ignore-whitespace(nil t)
call-interactively(vc-ediff-ignore-whitespace nil nil)
--8<---------------cut here---------------end--------------->8---
which I don't really understand.
With no certainty, I've tried to copy the parameters of `vc-ediff':
--8<---------------cut here---------------start------------->8---
(defun vc-ediff-ignore-whitespace (historic &optional not-urgent)
"Ignore regions that differ in white space & line breaks only."
(interactive (list current-prefix-arg t))
(let ((ediff-ignore-similar-regions t))
(vc-ediff historic not-urgent)))
--8<---------------cut here---------------end--------------->8---
then it worked further...
Though, I now have:
call-interactively: Symbol's value as variable is void:
ediff-ignore-similar-regions
when pressing `n' to go to the first difference region.
Any help?
Best regards,
Seb
--
Sebastien Vauban
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Calling Ediff which ignores whitespaces from VC Dir
2013-08-01 14:28 Calling Ediff which ignores whitespaces from VC Dir Sebastien Vauban
@ 2013-08-01 15:37 ` Stefan Monnier
[not found] ` <mailman.2315.1375371479.12400.help-gnu-emacs@gnu.org>
1 sibling, 0 replies; 4+ messages in thread
From: Stefan Monnier @ 2013-08-01 15:37 UTC (permalink / raw)
To: help-gnu-emacs
> Debugger entered--Lisp error: (wrong-number-of-arguments (1 . 2) 0)
0 is the number of args you have provided. (1 . 2) is the min and max
number of args expected by the function.
> With no certainty, I've tried to copy the parameters of `vc-ediff':
> --8<---------------cut here---------------start------------->8---
> (defun vc-ediff-ignore-whitespace (historic &optional not-urgent)
> "Ignore regions that differ in white space & line breaks only."
> (interactive (list current-prefix-arg t))
> (let ((ediff-ignore-similar-regions t))
> (vc-ediff historic not-urgent)))
You could also use (call-interactively 'vc-ediff) instead.
> call-interactively: Symbol's value as variable is void:
> ediff-ignore-similar-regions
That's because ediff was (auto)loaded while ediff-ignore-similar-regions
was let-bound. So at the end of the let, ediff-ignore-similar-regions
was reset to its previous value (i.e. unbound).
That's a long standing problem. To work around such issues, you want to
explicitly load ediff before doing the let.
Stefan
^ permalink raw reply [flat|nested] 4+ messages in thread
[parent not found: <mailman.2315.1375371479.12400.help-gnu-emacs@gnu.org>]
* Re: Calling Ediff which ignores whitespaces from VC Dir
[not found] ` <mailman.2315.1375371479.12400.help-gnu-emacs@gnu.org>
@ 2013-08-02 9:11 ` Sebastien Vauban
2013-08-02 14:39 ` Stefan Monnier
0 siblings, 1 reply; 4+ messages in thread
From: Sebastien Vauban @ 2013-08-02 9:11 UTC (permalink / raw)
To: help-gnu-emacs-mXXj517/zsQ
Stefan Monnier wrote:
>> Debugger entered--Lisp error: (wrong-number-of-arguments (1 . 2) 0)
>
> 0 is the number of args you have provided. (1 . 2) is the min and max
> number of args expected by the function.
>
>> With no certainty, I've tried to copy the parameters of `vc-ediff':
>
>> --8<---------------cut here---------------start------------->8---
>> (defun vc-ediff-ignore-whitespace (historic &optional not-urgent)
>> "Ignore regions that differ in white space & line breaks only."
>> (interactive (list current-prefix-arg t))
>> (let ((ediff-ignore-similar-regions t))
>> (vc-ediff historic not-urgent)))
>
> You could also use (call-interactively 'vc-ediff) instead.
OK, less error-prone (in case arguments to `vc-ediff' would change).
>> call-interactively: Symbol's value as variable is void:
>> ediff-ignore-similar-regions
>
> That's because ediff was (auto)loaded while ediff-ignore-similar-regions
> was let-bound. So at the end of the let, ediff-ignore-similar-regions
> was reset to its previous value (i.e. unbound).
>
> That's a long standing problem. To work around such issues, you want to
> explicitly load ediff before doing the let.
When you say "load ediff", I assume you mean writing a `require' call, right?
That way, it's not loaded multiple times?
OK. Latest version, then:
--8<---------------cut here---------------start------------->8---
(defun vc-ediff-ignore-whitespace (historic &optional not-urgent)
"Ignore regions that differ in white space & line breaks only."
(interactive (list current-prefix-arg t))
(require 'ediff)
(let ((ediff-ignore-similar-regions t))
(call-interactively 'vc-ediff)))
--8<---------------cut here---------------end--------------->8---
Though there is no error anymore, it does not work: "similar regions" are not
skipped as expected.
Something due to the fact that the variable `ediff-ignore-similar-regions' is
a local one? When checking its value in the Ediff control window, I see it's
nil -- which confirms the fact that the `let' is somehow not "applied"
correctly.
Is there a way to work around this?
Best regards,
Seb
--
Sebastien Vauban
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Calling Ediff which ignores whitespaces from VC Dir
2013-08-02 9:11 ` Sebastien Vauban
@ 2013-08-02 14:39 ` Stefan Monnier
0 siblings, 0 replies; 4+ messages in thread
From: Stefan Monnier @ 2013-08-02 14:39 UTC (permalink / raw)
To: help-gnu-emacs
> When you say "load ediff", I assume you mean writing a `require' call, right?
Right.
> Though there is no error anymore, it does not work: "similar regions" are not
> skipped as expected.
> Something due to the fact that the variable `ediff-ignore-similar-regions' is
> a local one?
No.
> When checking its value in the Ediff control window, I see it's
> nil -- which confirms the fact that the `let' is somehow not "applied"
> correctly.
No, it's simply that by that time, the let has already ended.
The call to `vc-ediff' sets up the various windows/buffers and puts
the buffers in the proper modes, and then returns.
Stefan
^ permalink raw reply [flat|nested] 4+ messages in thread
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2013-08-01 14:28 Calling Ediff which ignores whitespaces from VC Dir Sebastien Vauban
2013-08-01 15:37 ` Stefan Monnier
[not found] ` <mailman.2315.1375371479.12400.help-gnu-emacs@gnu.org>
2013-08-02 9:11 ` Sebastien Vauban
2013-08-02 14:39 ` Stefan Monnier
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