Fwd: How to set CTRL and minus as a key mapping?

On Sat, May 21, 2016 at 12:00 AM, Nikolay Aleksandrovich Pavlov
<zyx.vim@gmail.com> wrote:
> 2016-05-20 23:03 GMT+03:00 Tony Mechelynck <antoine.mechelynck@gmail.com>:
>> On Wed, May 18, 2016 at 4:48 PM, Nikolay Aleksandrovich Pavlov
>> <zyx.vim@gmail.com> wrote:
>>> 2016-05-18 14:08 GMT+03:00 Igor Forca <igor2x@gmail.com>:
>>>> Hi,
>>>> I really like to use big fonts in my gVim 7.4 on Windows 7. But time to time I would like to have smaller font size, to actually see bigger picture (without need to move up or down).
>>>>
>>>> In this case I would like to create key mapping CTRL and minus to shrink font and CTRL and plus to set it back to normal. Something very similar is used in a lot of programs like in Firefox (to zoom up/down).
>>>>
>>>> What I have figure it out I can set the following:
>>>> nnoremap <C-x> <Esc>:set guifont=Consolas:h9:cDEFAULT<CR>
>>>> nnoremap <C-y> <Esc>:set guifont=Consolas:h15:cDEFAULT<CR>
>>>>
>>>> and works fine, but instead of C-x and C-y I would like to set C-- and C-+
>>>> like:
>>>> nnoremap <C--> <Esc>:set guifont=Consolas:h9:cDEFAULT<CR>
>>>> nnoremap <C-+> <Esc>:set guifont=Consolas:h15:cDEFAULT<CR>
>>>>
>>>> But when pressing CTRL and minus nothing happens, the same with CTRL and plus.
>>>> It looks like there is something else going on. How to debug this problem? How to map "CTRL and minus" and "CTRL and plus" to above setting?
>>>
>>> You cannot use modifiers with any non-ASCII character and some of the
>>> ASCII ones: namely those that do not live in range 0x40 .. 0x5F: i.e.
>>> from `@` to underscore; . The single exception are special keys like
>>> F1..F12, arrows, etc. So `<C-->` is probably `<C-_>`, but `<C-+>` will
>>> not work, this is by design (problem is internal representation of
>>> those keys and legacy from the days when Vi supported ASCII-only
>>> terminals, modern terminal emulators *still* not supporting more key
>>> combinations makes this issue even harder because it narrows down a
>>> number of people who need this fixed; strange, but `:echo "\<C-+>"`
>>> yields something which looks like special internal representation of
>>> `<C-+>`, but still this key combo is not going to work). Neovim has
>>> wider support of such key combinations, but AFAIR its Windows build is
>>> still experimental (and I do not know about GUI).
>>>
>>>>
>>>> Thanks
>>>>
>>
>>
>>
>> What might work is to use Alt instead of Ctrl. The usual result
>> (depending on your terminal settings) is that Alt sets the 0x80 bit on
>
> OP mentions gVim. So terminal settings are not involved. Do not know
> how `<A-` is encoded there, but `:echo "\<A-t>"` producing U+00F4
> (note: *not* 0xF4 byte) (&encoding is utf-8) suggests that it would be
> again handled in a strange fashion.
>
>> printable keys, so that <A--> maps to 0xAD or U+00AD which is (in
>> Latin1 and in UTF-8) the soft-hyphen, and <A-+> maps to 0xAB or U+00AB
>
> 0xAD byte is *not* U+00AD in UTF-8. U+00AD in UTF-8 is 0xC2 0xAD. Same
> for U+00AB.

I didn't mean U+00AD was single-byte 0xAD in UTF-8; indeed, the latter
is illegal alone. I meant Alt adds (or, I think, ORs) a 0x80 bit,
changing the minus sign to 0xAD in Latin1 or U+00AD in UTF-8: when I
hit Alt-minus in Insert mode in my gvim instance (X11 Huge with
GTK2/Gnome2), with 'encoding' set to utf-8, I get U+00AD: ga answers
"< > 173, Hex 00ad, Octal 255" and g8 answers (as you noticed) "c2
ad". For the record, if instead of Alt-minus I hit Ctrl-V followed by
Alt-minus I get exactly the same. So I expect that <A--> and <A-+>,
when sourced in the {lhs} of a :map instruction after having made sure
that 'encoding' is UTF-8 and that 'nocompatible' is set (the latter
for the <> mappings), would be stored internally as U+00AD and U+00AB
respectively, and recognized correctly when hit in Normal mode later
on.

>
>> which is the opening French quote. AFAIK neither of these collides
>> with anything useful in Normal mode, but in Insert mode your text
>> writing habits may (or may not) call for soft-hypens and/or French
>> quotes.
>>
>> Best regards,
>> Tony.

--
--
You received this message from the "vim_use" maillist.
Do not top-post! Type your reply below the text you are replying to.
For more information, visit http://www.vim.org/maillist.php

---
You received this message because you are subscribed to the Google Groups "vim_use" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vim_use+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.