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bug#32754: (vc-retrieve-tag-hook)

From: Charles A. Roelli
Subject: bug#32754: (vc-retrieve-tag-hook)
Date: Mon, 01 Oct 2018 20:25:24 +0200

Here's the patch for review.  Hooks in VC are documented only in
vc.el, so I have not added further documentation elsewhere.

diff --git a/etc/NEWS b/etc/NEWS
index daacf49..1d5820c 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -329,6 +329,8 @@ git-grep when 'vc-git-grep' is used.
 When some files are marked, only those are stashed.
 When no files are marked, all modified files are stashed, as before.
+*** The new hook 'vc-retrieve-tag-hook' runs after retrieving a tag.
 ** diff-mode
 *** Hunks are now automatically refined by default.
 To disable it, set the new defcustom 'diff-font-lock-refine' to nil.
diff --git a/lisp/vc/vc.el b/lisp/vc/vc.el
index d3d66d6..243a796 100644
--- a/lisp/vc/vc.el
+++ b/lisp/vc/vc.el
@@ -834,6 +834,13 @@ vc-before-checkin-hook
   :type 'hook
   :group 'vc)
+(defcustom vc-retrieve-tag-hook nil
+  "Normal hook (list of functions) run after retrieving a tag."
+  :type 'hook
+  :group 'vc
+  :version "27.1")
 (defcustom vc-revert-show-diff t
   "If non-nil, `vc-revert' shows a `vc-diff' buffer before querying."
   :type 'boolean
@@ -2154,7 +2161,8 @@ vc-retrieve-tag
 If NAME is empty, it refers to the latest revisions of the current branch.
 If locking is used for the files in DIR, then there must not be any
 locked files at or below DIR (but if NAME is empty, locked files are
-allowed and simply skipped)."
+allowed and simply skipped).
+This function runs the hook `vc-retrieve-tag-hook' when finished."
    (let* ((granularity
            (vc-call-backend (vc-responsible-backend default-directory)
@@ -2181,6 +2189,7 @@ vc-retrieve-tag
     (vc-call-backend (vc-responsible-backend dir)
                     'retrieve-tag dir name update)
     (vc-resynch-buffer dir t t t)
+    (run-hooks 'vc-retrieve-tag-hook)
     (message "%s" (concat msg "done"))))

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