Vim quickfix options, mappings and commands

init.vim

" Open the quickfix window in a horizontal split at the bottom
" The height is the number of quickfix items (if it fits)
command! Copen execute "cclose | botright copen " . len(getqflist())

" Open the quickfix window in a vertical split to the left
command! Vcopen execute "cclose | copen | wincmd H"

" Add the cfilter plugin to enable the :Cfilter command
" This command lets you filter the quickfix list
packadd cfilter

qf.vim

" Make the quickfix window behave like a regular window when resizing
" E.g. <C-W>= will resize the quickfix window to the same size as the other windows
setlocal nowinfixheight
setlocal nowinfixwidth

" Open the quickfix item under the cursor but stay in the quickfix window
" zt adjusts the window so that the line is at the top
nnoremap <buffer> p <CR>zt<C-w>p

" Open the quickfix item below but stay in the quickfix window
nnoremap <buffer> <C-j> j<CR>zt<C-w>p

" Open the quickfix item above but stay in the quickfix window
nnoremap <buffer> <C-k> k<CR>zt<C-w>p

Typical workflow:

:grep some_function . -r
:Vcopen
" Use <C-J> and <C-K> to explore the found matches without leaving the quickfix window