Re: why remap is not working

* wei gao [2011.04.01 02:40]:
> I want to add ";" to the end of line when coding. So, I add the following
> map in vimrc. however, it's not working for me (if I change to <C-e>, it's
> OK). Anybody know why? <C-;> is mapped to a special command already?
>
> :inoremap <C-;> <C-o>A;

While you may see things like <C-e> or <C-]> as a sequence of keys, vim
actually gets those as a single character. These characters are *typed*
using a combination of the control key and another key on your keyboard
but when they actually reach vim they are one character.

The set of these so called "control characters" are the first 32 ASCII
values (namely 0x00 to 0x1F in hex). You can map each control character
(which are "unprintable" characters) to a printable character used to
enter it on the keyboard. You do this by adding 0x40 to the value of the
control character like this:

0x00 = <C-@> maps to 0x40 = @
0x01 = <C-A> maps to 0x41 = A
0x02 = <C-B> maps to 0x42 = B
0x03 = <C-C> maps to 0x43 = C
...
0x1A = <C-Z> maps to 0x5A = Z
0x1B = <C-[> maps to 0x5B = [
0x1C = <C-\> maps to 0x5C = \
0x1D = <C-]> maps to 0x5D = ]
0x1E = <C-^> maps to 0x5E = ^
0x1F = <C-_> maps to 0x5F = _

And that's it. There are no others.

So, long story short, the reason you can't map <C-;> is that there is no
such character.

--
JR

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