bug#38282: 26.3; goto-line should not share input history with other commands

[Federico Tedin <federicotedin@gmail.com>]

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> Thanks, I think this variable should be mentioned in the ELisp manual
> (in the "Minibuffer History" node) and in NEWS.

Sorry, forgot to do that. I've now documented both new variables (the
one for `read-number' and the one for `goto-line'). I'm attaching a new
patch.


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From 67e2d243473c52c1b52102203cf069dbed4165cc Mon Sep 17 00:00:00 2001
From: Federico Tedin <federicotedin@gmail.com>
Date: Tue, 17 Dec 2019 22:13:55 +0100
Subject: [PATCH 1/1] 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.
---
 doc/lispref/minibuf.texi |  9 +++++++++
 etc/NEWS                 | 11 +++++++++++
 lisp/simple.el           |  7 ++++++-
 lisp/subr.el             |  9 +++++++--
 4 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/doc/lispref/minibuf.texi b/doc/lispref/minibuf.texi
index dde30ce67f..2c2ef9747b 100644
--- a/doc/lispref/minibuf.texi
+++ b/doc/lispref/minibuf.texi
@@ -645,6 +645,15 @@ Minibuffer History
 @code{read-variable}.
 @end defvar
 
+@defvar read-number-history
+A history list for numbers read by @code{read-number}.
+@end defvar
+
+@defvar goto-line-history
+A history list for arguments to @code{goto-line}.  This variable is
+buffer local.
+@end defvar
+
 @c Less common: coding-system-history, input-method-history,
 @c command-history, grep-history, grep-find-history,
 @c read-envvar-name-history, setenv-history, yes-or-no-p-history.
diff --git a/etc/NEWS b/etc/NEWS
index cf4e705a52..dc17445757 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -533,6 +533,17 @@ The HIST argument of 'read-from-minibuffer' now works correctly with
 buffer-local variables.  This means that different buffers can have
 their own separated input history list if desired.
 
++++
+** 'read-number' now has its own history variable.
+Additionally, the function now accepts a HIST argument which can be
+used to specify a custom history variable.
+
++++
+** Input history for 'goto-line' is now local to every buffer.
+Each buffer will keep a separate history of line numbers used with
+'goto-line'.  This should help making faster the process of finding
+line numbers that were previously jumped to.
+
 \f
 * Editing Changes in Emacs 27.1
 
diff --git a/lisp/simple.el b/lisp/simple.el
index 6d5030073b..6219986da0 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -1212,6 +1212,10 @@ mark-whole-buffer
 
 ;; 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 @@ goto-line
 	       "")))
        ;; 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 ed55853bb2..f5b7c98f50 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -2518,10 +2518,15 @@ read-passwd
               ;; 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 @@ read-number
     (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))
-- 
2.17.1