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Re: How to separate key bindings of TAB and C-i?

From: Kevin Rodgers
Subject: Re: How to separate key bindings of TAB and C-i?
Date: Wed, 08 Nov 2006 14:04:32 -0700
User-agent: Thunderbird (Windows/20060909)

gniuxiao wrote:
I want to insert a tab when type TAB and indent current line when type
C-i, so I wrote the following codes:

(defun my-insert-tab()
 (insert "    "))

(global-set-key (kbd "TAB") 'my-insert-tab)
(global-set-key (kbd "C-i") 'lisp-indent-line)

(kbd "TAB") = (kbd "C-i") = "\t"

but both TAB and C-i invoke lisp-indent-line, then I changed the
setting sequence to:

(global-set-key (kbd "C-i") 'lisp-indent-line)
(global-set-key (kbd "TAB") 'my-insert-tab)

now both TAB and C-i invoke my-insert-tab.

Note that TAB/C-i may have a different binding in different buffers.
For example, in Fundamental mode, it is bound (globally) to
indent-for-tab-command.  But in Lisp Interaction mode (e.g. the
*scratch* buffer) it is bound (locally) to lisp-indent-line.

I think TAB and C-i are internally stick to each other, and I wanna
know how to separate them, thanks ;-)

From the Function Keys node of the Emacs Lisp manual:

| `backspace', `tab', `newline', `return', `delete'
|      These keys correspond to common ASCII control characters that have
|      special keys on most keyboards.
|      In ASCII, `C-i' and <TAB> are the same character.  If the terminal
|      can distinguish between them, Emacs conveys the distinction to
|      Lisp programs by representing the former as the integer 9, and the
|      latter as the symbol `tab'.
|      Most of the time, it's not useful to distinguish the two.  So
|      normally `function-key-map' (*note Translating Input::) is set up
|      to map `tab' into 9.  Thus, a key binding for character code 9 (the
|      character `C-i') also applies to `tab'.  Likewise for the other
|      symbols in this group.  The function `read-char' likewise converts
|      these events into characters.

Try binding (kdb "<tab>") = [tab] in the global keymap.


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