org-attach: Make use of git optional

* lisp/org-attach.el (org-attach-commit): New variable.
(org-attach-attach): Use new variable.

TINYCHANGE

etc/ORG-NEWS

@@ -209,6 +209,9 @@ an :indent parameter, much like the one in the clock table.
 
 On the other hand, stars no longer appear in an ITEM field.
 *** Preview LaTeX snippets in buffers not visiting files
+*** New option ~org-attach-commit~
+When non-nil, commit attachments with git, assuming the document is in
+a git repository.
 ** New functions
 *** ~org-next-line-empty-p~
 It replaces the deprecated ~next~ argument to ~org-previous-line-empty-p~.

lisp/org-attach.el

@@ -55,6 +55,14 @@ where the Org file lives."
   :group 'org-attach
   :type 'directory)
 
+(defcustom org-attach-commit t
+  "If non-nil commit attachments with git.
+This is only done if the Org file is in a git repository."
+  :group 'org-attach
+  :type 'boolean
+  :version "25.1"
+  :package-version '(Org . "9.0"))
+
 (defcustom org-attach-git-annex-cutoff (* 32 1024)
   "If non-nil, files larger than this will be annexed instead of stored."
   :group 'org-attach
@@ -373,7 +381,8 @@ METHOD may be `cp', `mv', `ln', or `lns' default taken from
        ((eq method 'cp)	(copy-file file fname))
        ((eq method 'ln) (add-name-to-file file fname))
        ((eq method 'lns) (make-symbolic-link file fname)))
-      (org-attach-commit)
+      (when org-attach-commit
+	(org-attach-commit))
       (org-attach-tag)
       (cond ((eq org-attach-store-link-p 'attached)
 	     (org-attach-store-link fname))