bug#1386: 23.0.60; vc-git-diff: diff switches can't be customized

[Glenn Morris]

Magnus Henoch wrote:

> I then found that vc-git-diff doesn't obey _any_ of diff-switches,
> vc-diff-switches and vc-git-diff-switches, though the docstring of
> vc-diff-switches implies that it would.


Sorry for the long delay. Please try this patch.


*** vc-git.el   27 Oct 2008 07:21:47 -0000      1.74
--- vc-git.el   21 Nov 2008 19:32:55 -0000
***************
*** 109,114 ****
--- 109,127 ----
    (require 'vc-dir)
    (require 'grep))
  
+ (defcustom vc-git-diff-switches t
+   "String or list of strings specifying extra switches for Git diff under VC.
+ If nil, use the value of `vc-diff-switches'.
+ If you want to force an empty list of arguments, use t."
+   :type '(choice (const :tag "Unspecified" nil)
+                (const :tag "None" t)
+                (string :tag "Argument String")
+                (repeat :tag "Argument List"
+                        :value ("")
+                        string))
+   :version "23.1"
+   :group 'vc)
+ 
  (defvar git-commits-coding-system 'utf-8
    "Default coding system for git commits.")
  
***************
*** 501,512 ****
    (beginning-of-line))
  
  (defun vc-git-diff (files &optional rev1 rev2 buffer)
!   (let ((buf (or buffer "*vc-diff*")))
!     (if (and rev1 rev2)
!         (vc-git-command buf 1 files "diff-tree" "--exit-code" "-p"
!                         rev1 rev2 "--")
!       (vc-git-command buf 1 files "diff-index" "--exit-code" "-p"
!                       (or rev1 "HEAD") "--"))))
  
  (defun vc-git-revision-table (files)
    ;; What about `files'?!?  --Stef
--- 514,525 ----
    (beginning-of-line))
  
  (defun vc-git-diff (files &optional rev1 rev2 buffer)
!   "Get a difference report using Git between two revisions of FILES."
!   (apply #'vc-git-command (or buffer "*vc-diff*") 1 files
!        (if (and rev1 rev2) "diff-tree" "diff-index")
!        "--exit-code"
!        (append (vc-switches (if vc-git-diff-switches 'git) 'diff)
!                (list "-p" (or rev1 "HEAD") rev2 "--"))))
  
  (defun vc-git-revision-table (files)
    ;; What about `files'?!?  --Stef