FW: On the Printing Problem

[Herbert Euler]

> 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.

Regards,
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
>
> Hello,
>
> Here is my conclusion on the problem arised when I mixed Icicles and
> Printing.
>
> 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
>                           'find-file-literally
>                           foo-map
>                           global-map)
> ==> nil
>
> foo-map
> ==> (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)")
>                               :enable
>                               (menu-bar-non-minibuffer-window-p)
>                               :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
> feature.
>
> Regards,
> Herbert
>
> _________________________________________________________________
> Get FREE company branded e-mail accounts and business Web site from 
> Microsoft Office Live 
> http://clk.atdmt.com/MRT/go/mcrssaub0050001411mrt/direct/01/

_________________________________________________________________
Express yourself instantly with MSN Messenger! Download today it's FREE! 
http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/