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Re: Saving minibuffer history

From: Stefan Monnier
Subject: Re: Saving minibuffer history
Date: Sun, 16 Oct 2005 11:39:19 -0400
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

>> I installed it.  Thanks.
> Thank you.  An improved version is now available at
> <http://fly.srk.fer.hr/~hniksic/emacs/savehist.el>.

Thank you.  Installed.  Along with a few minor changes, mostly to remove
run-time dependency on CL and to get rid of most checks for XEmacs, replaced
by checks for features.

I have one question: what's the point of savehist-no-conversion?

Also see attached a proposed patch (100% guaranteed untested).  If nobody
objects, I'll install it.

I could also get rid of savehist-history-variables altogether.


2005-10-16  Stefan Monnier  <address@hidden>

        * savehist.el (savehist-file): Use the ~/.emacs.d directory.
        (savehist-all-history-variables): New var.
        (savehist-minibuffer-hook): New fun to populate it.
        (savehist-save): Use and save it.
        (savehist-history-variables): Default to nil, meaning "all".

Index: savehist.el
RCS file: /cvsroot/emacs/emacs/lisp/savehist.el,v
retrieving revision 1.3
diff -u -u -b -r1.3 savehist.el
--- savehist.el 16 Oct 2005 15:22:37 -0000      1.3
+++ savehist.el 16 Oct 2005 15:33:46 -0000
@@ -52,64 +52,20 @@
   "Save minibuffer history."
   :group 'minibuffer)
-(defcustom savehist-history-variables
-  '(
-    ;; Catch-all minibuffer history
-    minibuffer-history
-    ;; File-oriented commands
-    file-name-history
-    ;; Regexp-related reads
-    regexp-history
-    ;; Searches in minibuffer (via `M-r' and such)
-    minibuffer-history-search-history
-    ;; Query replace
-    query-replace-history
-    ;; eval-expression (`M-:')
-    read-expression-history
-    ;; shell-command (`M-!')
-    shell-command-history
-    ;; compile
-    compile-history
-    ;; find-tag (`M-.')
-    find-tag-history
-    ;; grep
-    grep-history
-    ;; Viper stuff
-    vip-ex-history vip-search-history
-    vip-replace1-history vip-replace2-history
-    vip-shell-history vip-search-history
-    ;; XEmacs-specific:
-    ;; Buffer-related commands
-    buffer-history
-    ;; Reads of variables and functions
-    variable-history function-history
-    ;; Extended commands
-    read-command-history
-    ;; Info, lookup, and bookmark historys
-    Info-minibuffer-history
-    Info-search-history
-    Manual-page-minibuffer-history
-    ;; Emacs-specific:
-    ;; Extended commands
-    extended-command-history)
+(defvar savehist-all-history-variables nil)
+(defcustom savehist-history-variables nil
   "*List of symbols to be saved.
 Every symbol should refer to a variable.  The variable will be saved
 only if it is bound and has a non-nil value.  Thus it is safe to
 specify a superset of the variables a user is expected to want to
-Default value contains minibuffer history variables used by Emacs, XEmacs,
-and Viper (uh-oh).  Note that, if you customize this variable, you
-can lose the benefit of future versions of Emacs adding new values to
-the list.  Because of that it might be more useful to add values using
+If nil, all history variables will be saved."
   :type '(repeat (symbol :tag "Variable"))
   :group 'savehist)
-(defcustom savehist-file "~/.emacs-history"
+(defcustom savehist-file "~/.emacs.d/history"
   "*File name to save minibuffer history to.
 The minibuffer history is a series of Lisp expressions, which should be
 loaded using `savehist-load' from your .emacs.  See `savehist-load' for
@@ -201,7 +157,11 @@
          (print-level nil)
          (print-readably t)
          (print-quoted t))
-      (dolist (sym savehist-history-variables)
+      (prin1
+       `(setq savehist-all-history-variables ',savehist-all-history-variables)
+       (current-buffer))
+      (dolist (sym (or savehist-history-variables
+                       savehist-all-history-variables))
        (when (boundp sym)
          (let ((value (savehist-process-for-saving (symbol-value sym))))
            (prin1 `(setq ,sym ',value) (current-buffer))
@@ -261,6 +221,11 @@
       ;; The attempt failed: the object is not printable.
       (error nil)))))
+(defun savehist-minibuffer-hook ()
+  (add-to-list 'savehist-all-history-variables minibuffer-history-variable))
+(add-hook 'minibuffer-setup-hook 'savehist-minibuffer-hook)
 (provide 'savehist)

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