Some custom Vim key mappings

.vimrc

" Set the leader key to comma for custom mappings
let mapleader = ","

" Set timeout for key sequences (in milliseconds)
set timeout timeoutlen=500

" Use system clipboard for all yank, delete, and put operations
set clipboard=unnamedplus

" Insert new lines without leaving normal mode
" oo: Insert line below
" OO: Insert line above
nnoremap oo m`o<Esc>``
nnoremap OO m`O<Esc>``

" Prevent delete operations from saving text to register/clipboard
" This allows for 'delete without cut' functionality
nnoremap x "_x
nnoremap X "_X
nnoremap d "_d
nnoremap D "_D
vnoremap d "_d

" Use leader key for cut operations (moving text to system clipboard)
" <leader>d: Cut current line or selection
" <leader>D: Cut from cursor to end of line
nnoremap <leader>d "+d
nnoremap <leader>D "+D
vnoremap <leader>d "+d

"Select All
nnoremap <leader>a ggVG