Why `vim.keymap.set` is case sensitive sometimes and insensitive other times?

Neovim
1

Hi everybody, I have these two mappings to work with clipboard selection (+ register in nvim), and I’m puzzled by the fact that I specified <C-V> for pasting in insert mode and it correctly let me use the key combination CTRL-SHIFT-v (notice that V is in uppercase when setting the mapping).

However I have <C-C> for copying but it works with CTRL-c, and if I press CTRL-SHIFT-c, it doesn’t do anything and just keeps me in visual selection mode.

It’s not a big deal, but it breaks homogeneity for me.

-- copy, visual mode
vim.keymap.set('v', '<C-C>', '"+y')
-- paste, insert mode
vim.keymap.set('i', '<C-V>', '"+gP')

I know modifier keys can be in lower or uppercase, but what is Neovim considering for the {rhs}?

Also, if I press just CTRL-v for pasting it prints the {rhs} pasting command, which is "+gP, but as text instead of acting as command.

2

These mappings aren’t applied at all when you pressed these keys, because they are handled by the terminal emulator. This means that CTRL-SHIFT-V works in your terminal emulator even if you don’t have any mappings.

3

You are correct. I didn’t notice that it was using the terminal mapping to paste text. However CTRL-SHIFT-c, also from my terminal, doesn’t work, so I’ll keep that mapping.

So the lack of homogeneity was because that. I’ll mark your answer as the solution.

And I guess mappings are case insensitive.