Make goto-line keep a separate input history per buffer

* lisp/simple.el (goto-line-history): New history variable.
(goto-line): Use new (buffer-local) variable as input
history (Bug#38282).
* lisp/subr.el (read-number-history): New history variable.
(read-number): Use the new variable as default input history.
* doc/lispref/minibuf.texi (Minibuffer History): Document
read-number-history and goto-line-history variables.
* etc/NEWS: Announce changes.

2 files changed, 13 insertions, 3 deletions

diff --git a/lisp/simple.el b/lisp/simple.el
index 6d5030073bb..6219986da0f 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -1212,6 +1212,10 @@ that uses or sets the mark."
 
 ;; Counting lines, one way or another.
 
+(defvar goto-line-history nil
+  "History of values entered with `goto-line'.")
+(make-variable-buffer-local 'goto-line-history)
+
 (defun goto-line (line &optional buffer)
   "Go to LINE, counting from line 1 at beginning of buffer.
 If called interactively, a numeric prefix argument specifies
@@ -1256,7 +1260,8 @@ rather than line counts."
                "")))
        ;; Read the argument, offering that number (if any) as default.
        (list (read-number (format "Goto line%s: " buffer-prompt)
-                          (list default (line-number-at-pos)))
+                          (list default (line-number-at-pos))
+                          'goto-line-history)
              buffer))))
   ;; Switch to the desired buffer, one way or another.
   (if buffer
diff --git a/lisp/subr.el b/lisp/subr.el
index ed55853bb27..f5b7c98f50d 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -2518,10 +2518,15 @@ by doing (clear-string STRING)."
               ;; And of course, don't keep the sensitive data around.
               (erase-buffer))))))))
 
-(defun read-number (prompt &optional default)
+(defvar read-number-history nil
+  "The default history for the `read-number' function.")
+
+(defun read-number (prompt &optional default hist)
   "Read a numeric value in the minibuffer, prompting with PROMPT.
 DEFAULT specifies a default value to return if the user just types RET.
 The value of DEFAULT is inserted into PROMPT.
+HIST specifies a history list variable.  See `read-from-minibuffer'
+for details of the HIST argument.
 This function is used by the `interactive' code letter `n'."
   (let ((n nil)
         (default1 (if (consp default) (car default) default)))
@@ -2535,7 +2540,7 @@ This function is used by the `interactive' code letter `n'."
     (while
         (progn
           (let ((str (read-from-minibuffer
-                      prompt nil nil nil nil
+                      prompt nil nil nil (or hist 'read-number-history)
                       (when default
                         (if (consp default)
                             (mapcar 'number-to-string (delq nil default))