bug#30235: [patch] undo-tree byte-compiler warnings

[Alex Branham]

I'm not sure if this is the right place to submit patches for ELPA
packages, but I couldn't find anywhere else to go. Let me know if this
should go some place else.

This patch silences several byte compiler warnings, mostly having to do
with unused lexical variables in loops. There are two remaining that I
couldn't figure out how to deal with because I'm not terribly familiar
with the innards of Emacs's undo feature. (Note that the line numbers
are after applying the attached patch):

In undo-tree-pull-undo-in-region-branch:
undo-tree.el:2261:16:Warning: ‘undo-elt-crosses-region’ is an obsolete
    function (as of 25.1).

In undo-tree-pull-redo-in-region-branch:
undo-tree.el:2470:16:Warning: ‘undo-elt-crosses-region’ is an obsolete
    function (as of 25.1).


>From f9a275a3cdb586f9ea91e26be84b4a42efe957fc Mon Sep 17 00:00:00 2001
From: Alex Branham <branham@utexas.edu>
Date: Tue, 23 Jan 2018 17:10:48 -0600
Subject: [PATCH] Silence the byte-compiler

---
 undo-tree.el | 38 +++++++++++++++++++++-----------------
 1 file changed, 21 insertions(+), 17 deletions(-)

diff --git a/undo-tree.el b/undo-tree.el
index 6c7ee2f..fc52cff 100644
--- a/undo-tree.el
+++ b/undo-tree.el
@@ -757,6 +757,10 @@
 (eval-when-compile (require 'cl))
 (require 'diff)

+;; silence the byte compiler
+(defvar undo-tree-mode)
+(defvar undo-tree-visualizer-selection-mode)
+


 ;;; =====================================================================
@@ -2048,7 +2052,7 @@ which is defined in the `warnings' library.\n")
        ((= (mod num-children 2) 1)
         (setq p (undo-tree-node-next node))
         ;; compute left-width
-        (dotimes (i (/ num-children 2))
+        (dotimes (_i (/ num-children 2))
           (if (undo-tree-node-lwidth (car p))
               (incf lwidth (+ (undo-tree-node-lwidth (car p))
                               (undo-tree-node-cwidth (car p))
@@ -2064,7 +2068,7 @@ which is defined in the `warnings' library.\n")
         ;; compute right-width
         (incf rwidth (undo-tree-node-rwidth (car p)))
         (setq p (cdr p))
-        (dotimes (i (/ num-children 2))
+        (dotimes (_i (/ num-children 2))
           (if (undo-tree-node-lwidth (car p))
               (incf rwidth (+ (undo-tree-node-lwidth (car p))
                               (undo-tree-node-cwidth (car p))
@@ -2076,7 +2080,7 @@ which is defined in the `warnings' library.\n")
        (t
         (setq p (undo-tree-node-next node))
         ;; compute left-width
-        (dotimes (i (/ num-children 2))
+        (dotimes (_i (/ num-children 2))
           (if (undo-tree-node-lwidth (car p))
               (incf lwidth (+ (undo-tree-node-lwidth (car p))
                               (undo-tree-node-cwidth (car p))
@@ -2086,7 +2090,7 @@ which is defined in the `warnings' library.\n")
         ;; centre-width is 0 when number of children is even
         (setq cwidth 0)
         ;; compute right-width
-        (dotimes (i (/ num-children 2))
+        (dotimes (_i (/ num-children 2))
           (if (undo-tree-node-lwidth (car p))
               (incf rwidth (+ (undo-tree-node-lwidth (car p))
                               (undo-tree-node-cwidth (car p))
@@ -2748,7 +2752,7 @@ changes within the current region."
     ;; `buffer-undo-tree'
     (undo-list-transfer-to-tree)

-    (dotimes (i (or (and (numberp arg) (prefix-numeric-value arg)) 1))
+    (dotimes (_i (or (and (numberp arg) (prefix-numeric-value arg)) 1))
       ;; check if at top of undo tree
       (unless (undo-tree-node-previous (undo-tree-current buffer-undo-tree))
        (user-error "No further undo information"))
@@ -2857,7 +2861,7 @@ changes within the current region."
     ;; `buffer-undo-tree'
     (undo-list-transfer-to-tree)

-    (dotimes (i (or (and (numberp arg) (prefix-numeric-value arg)) 1))
+    (dotimes (_i (or (and (numberp arg) (prefix-numeric-value arg)) 1))
       ;; check if at bottom of undo tree
       (when (null (undo-tree-node-next (undo-tree-current buffer-undo-tree)))
        (user-error "No further redo information"))
@@ -3576,7 +3580,7 @@ signaling an error if file is not found."
            (car (undo-tree-node-next node)))))
       (move-marker (setq pos (make-marker)) (point))
       (setq n (cons nil (undo-tree-node-next node)))
-      (dotimes (i (/ num-children 2))
+      (dotimes (_i (/ num-children 2))
         (setq n (cdr n))
         (when (or (null active-branch)
                   (eq (car n)
@@ -3629,7 +3633,7 @@ signaling an error if file is not found."
         (move-marker pos (point)))
       ;; right subtrees
       (move-marker trunk-pos (1+ trunk-pos))
-      (dotimes (i (/ num-children 2))
+      (dotimes (_i (/ num-children 2))
         (setq n (cdr n))
         (when (or (null active-branch)
                   (eq (car n)
@@ -3684,7 +3688,7 @@ signaling an error if file is not found."
   (when (characterp str)
     (setq str (make-string arg str))
     (setq arg 1))
-  (dotimes (i arg) (insert str))
+  (dotimes (_i arg) (insert str))
   (setq arg (* arg (length str)))
   (undo-tree-move-forward arg)
   ;; make sure mark isn't active, otherwise `backward-delete-char' might
@@ -3769,7 +3773,7 @@ signaling an error if file is not found."
        (undo-tree-move-forward
         (+ (undo-tree-node-char-rwidth (car n))
            (/ undo-tree-visualizer-spacing 2) 1))
-       (dotimes (i (- (/ l 2) p 1))
+       (dotimes (_i (- (/ l 2) p 1))
          (setq n (cdr n))
          (undo-tree-move-forward
           (+ (undo-tree-node-char-lwidth (car n))
@@ -3787,7 +3791,7 @@ signaling an error if file is not found."
           (+ (undo-tree-node-char-rwidth (car n))
              (/ undo-tree-visualizer-spacing 2) 1))
          (setq n (cdr n)))
-       (dotimes (i (- p (/ l 2) (mod l 2)))
+       (dotimes (_i (- p (/ l 2) (mod l 2)))
          (undo-tree-move-backward
           (+ (undo-tree-node-char-lwidth (car n))
              (undo-tree-node-char-rwidth (car n))
@@ -3801,13 +3805,13 @@ signaling an error if file is not found."


 (defun undo-tree-timestamp-to-string
-  (timestamp &optional relative current register)
+    (timestamp &optional relative current register)
   ;; Convert TIMESTAMP to string (either absolute or RELATVE time), indicating
   ;; if it's the CURRENT node and/or has an associated REGISTER.
   (if relative
       ;; relative time
       (let ((time (floor (float-time
-                         (subtract-time (current-time) timestamp))))
+                         (time-subtract (current-time) timestamp))))
            n)
        (setq time
              ;; years
@@ -4232,7 +4236,7 @@ specifies `saved', and a negative prefix argument 
specifies
     (user-error "Undo-tree mode not enabled in buffer"))
   (let ((node undo-tree-visualizer-selected-node))
     (catch 'top
-      (dotimes (i (or arg 1))
+      (dotimes (_i (or arg 1))
        (unless (undo-tree-node-previous node) (throw 'top t))
        (setq node (undo-tree-node-previous node))))
     ;; when using lazy drawing, extend tree upwards as required
@@ -4254,7 +4258,7 @@ specifies `saved', and a negative prefix argument 
specifies
     (user-error "Undo-tree mode not enabled in buffer"))
   (let ((node undo-tree-visualizer-selected-node))
     (catch 'bottom
-      (dotimes (i (or arg 1))
+      (dotimes (_i (or arg 1))
        (unless (nth (undo-tree-node-branch node) (undo-tree-node-next node))
          (throw 'bottom t))
        (setq node
@@ -4281,7 +4285,7 @@ specifies `saved', and a negative prefix argument 
specifies
     (goto-char (undo-tree-node-marker undo-tree-visualizer-selected-node))
     (setq end (line-end-position))
     (catch 'end
-      (dotimes (i arg)
+      (dotimes (_i arg)
        (while (or (null node) (eq node undo-tree-visualizer-selected-node))
          (forward-char)
          (setq node (get-text-property (point) 'undo-tree-node))
@@ -4304,7 +4308,7 @@ specifies `saved', and a negative prefix argument 
specifies
     (goto-char (undo-tree-node-marker undo-tree-visualizer-selected-node))
     (setq beg (line-beginning-position))
     (catch 'beg
-      (dotimes (i arg)
+      (dotimes (_i arg)
        (while (or (null node) (eq node undo-tree-visualizer-selected-node))
          (backward-char)
          (setq node (get-text-property (point) 'undo-tree-node))
--
2.16.1

0001-Silence-the-byte-compiler.patch
Description: Text Data