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I want to make separate bindings for <C-h> and <C-S-h>. For example:
noremap <C-h> <C-w>h
noremap <C-j> <C-w>j
noremap <C-k> <C-w>k
noremap <C-l> <C-w>l
noremap <C-S-h> :vertical resize -2<CR>
noremap <C-S-j> :resize -2<CR>
noremap <C-S-k> :resize +2<CR>
noremap <C-S-l> :vertical resize +2<CR>
However, with my settings, pressing <C-h> and <C-S-H> both trigger :vertical resize -2<CR> which should be mapped to only <C-S-h>.
How can I map <C-h> and <C-S-h> separately?
This is impossible as Vim doesn't "see" <C-S-h>.
Try the following:
Open Vim and enter insert mode. Noch press <C-v> followed by <C-h>. Vim
will insert ^H (highlighted in light blue by default). So Vim got <C-h>.
Now press <C-v> followed by <C-S-h> and Vim will again insert ^H.
So from Vims point of view, <C-h> and <C-S-h> are identical.
The reason is Vims origin as a terminal based program. Those terminals only supports "simple" control-character combinations.
You can use the test described above ( <C-v> ...) with any key combination
you would like to map.
PS: On my setup with Linux and GNOME-Terminal, Vim doesn't see <C-S-h> at
all, as the key combination is used by GNOME-Terminal.
Updated after the comments from Christian Brabandt and user938271:
Your mapping works with GVim (tested with 8.2.869).
Depending on the terminal emulator it might be possible for Vim to get the
<C-S-h>.
The XTerm terminal emulator supports a option called modifyOtherKeys. With
it the terminal supports additional key combos like <C-S-h>.
When XTerm is correctly configured, the mapping you describe work as expected. Tested with Vim 8.2.869 and xterm 351.
Read about it in :h modifyOtherKeys.
Notes:
modifyOtherKeys.modifyOtherKeys is not supported by GNOME-Terminal (see this bug )modifyOtherKeys in a Vim commit was version 8.1.2134 (Oct 2019)Conclusion: Your mapping will work with the right terminal emulator and configuration and a up-to-date Vim, but I would not rely on this, as it is not widely portable.
modifyOtherKeys, vim can distinguish <c-h> and <c-s-h>. However I think currently only xterm supports this (and perhaps the gui). gnome-terminal (or vte) has some wishlist bugs about supporting modifyOtherKeys
May 31, 2020 at 11:41
modifyOtherKeys in xterm. It sends esc-sequences for something like <C-.> or <C-S-.>, but <C-h> and <C-S-h> both send <C-h> (tried other chars as well).
ga. bestasciitable.com is good too :)
C-h from C-S-h in a terminal which supports the modifyOtherKeys feature such as xterm. xterm sends ^[[27;5;104~ for C-h and ^[[27;6;72~ for C-S-h which are different sequences. Tested on Vim 8.2.0869 and xterm 322.
May 31, 2020 at 22:26
C-S-v followed by C-v in insert mode; if you only get a literal ^V, then the feature is not enabled. Note that C-S-v is often used in a terminal key binding to paste the clipboard; if that's the case, you may need to temporarily disable the key binding.
May 31, 2020 at 22:26