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FW: On the Printing Problem

From: Herbert Euler
Subject: FW: On the Printing Problem
Date: Wed, 01 Nov 2006 14:00:25 +0800

From: Vinicius Jose Latorre <address@hidden>
To: Herbert Euler <address@hidden>
CC: address@hidden, address@hidden
Subject: Re: Icicles, Printing and Easy Menu
Date: Wed, 01 Nov 2006 03:08:05 -0200

For some reason the command:

  (easy-menu-change '("file") "Print" pr-menu-spec "print-buffer")

has no effect just after step 5.
The command above is correct, but has no effect, that is, "Print" submenu is not created.

But if after step 5, you do:

   5.1 C-h v global-map RET    ;; create *Help* buffer in another window
   5.2 C-x o                                 ;; switch to *Help* buffer

Now, all works.

I tried that, the evaluation of (pr-update-menus t) failed again.

Below is what I wrote to Drew.

Guanpeng Xu

From: "Herbert Euler" <address@hidden>
To: address@hidden
CC: address@hidden
Subject: On the Printing Problem
Date: Tue, 31 Oct 2006 11:26:21 +0800


Here is my conclusion on the problem arised when I mixed Icicles and

This problem is arised because Icicles mode rebinds the key bindings
in a way that is not robust in all aspects.  In file
`icicles-mode.el', Icicles mode rebinds many key bindings with
`substitute-key-definition'.  Let's see what
`substitute-key-definition' does.  As in your mail to the emacs-devel
mailing list, we evaluate some forms:

(defvar foo-map (make-sparse-keymap) "")
==> foo-map

(substitute-key-definition 'find-file
==> nil

==> (keymap
    (open . find-file-literally)
    (menu-bar keymap
              (file keymap
(new-file menu-item "Visit New File..." find-file-literally
                              ([24 6]
                               . "  (C-x C-f)")
:help "Specify a new file's name, to edit the file")))
    (24 keymap
        (6 . find-file-literally)))

As you see, `substitute-key-definition' copies the entries that with
`find-file' in their bindings in `global-map' into `foo-map' and
substitutes `find-file' with `find-file-literally'.

Icicles mode copies the entries in `global-map' in the same way.
After that, by enabling Icicles mode, `icicle-mode-map' becomes active
to all of the visible buffers.  `icicle-mode-map' is a minor mode
keymap, so it will shadow `global-map'.

When the user invokes `(pr-update-menus t)', Printing tries to update
Emacs' menu with `easy-menu-change'.  This will finally cause
`easy-menu-get-map' get invoked.  We have found that
`easy-menu-get-map' will pick up all maps but pick the global map
last.  Since Icicles mode already shadows the global map with its
`icicle-mode-map', a wrong entry is picked by `easy-menu-get-map', and
so Printing complains.  (In fact, `easy-menu-get-map' tries to find
the entry with `menu-bar' first.)

The purpose of `icicle-mode-map' is to rebind key bindings.  But there
is another way to do this, without making other packages signaling
errors.  Please take a look at (info "(elisp) Remapping Commands").
The other packages that try to provide similar completion features,
such as `ido', accomplish in this way actually.  The function
`ido-mode' in file `lisp/ido.el' is an example of using the remapping


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