system/home/progs/nvim/lua/coc.lua

-- Smaller updatetime for CursorHold & CursorHoldI
vim.opt.updatetime = 300

-- Coc don't use completeopt
vim.opt.completeopt = {}
-- don't give |ins-completion-menu| messages.
vim.opt.shortmess:append('c')

-- always show signcolumns
vim.opt.signcolumn = 'yes'

-- Some server have issues with backup files, see coc#649
vim.opt.backup = false
vim.opt.writebackup = false

-- Better display for messages
vim.opt.cmdheight = 2

-- Use <c-space> for trigger completion.
vim.keymap.set('i', '<C-space>', vim.fn['coc#refresh'], {
  silent = true,
  expr = true
})

-- Use <cr> for confirm completion, `<C-g>u` means break undo chain at current
-- position. Coc only does snippet and additional edit on confirm.
local function confirm_coc_completion()
  if vim.call'coc#pum#visible' == 1 then
    vim.call'coc#pum#confirm'
    return ""
  else 
    return "<CR>"
  end
end
vim.keymap.set('i', '<CR>', confirm_coc_completion, { expr = true, silent = true })

local sr_opts = { silent = true, remap = true }
-- Use `[c` and `]c` for navigate diagnostics
vim.keymap.set('n', '[c', '<Plug>(coc-diagnostic-prev)', sr_opts)
vim.keymap.set('n', ']c', '<Plug>(coc-diagnostic-next)', sr_opts)

-- Remap keys for gotos
vim.keymap.set('n', 'gd', '<Plug>(coc-definition)', sr_opts)
vim.keymap.set('n', 'gy', '<Plug>(coc-type-definition)', sr_opts)
vim.keymap.set('n', 'gi', '<Plug>(coc-implementation)', sr_opts)
vim.keymap.set('n', 'gr', '<Plug>(coc-references)', sr_opts)

-- Remap for do code action of current line
vim.keymap.set('n', '<localleader>a', '<Plug>(coc-codeaction)')
-- Remap for rename current word
vim.keymap.set('n', '<localleader>n', '<Plug>(coc-rename)')

-- Mapping for CocList
vim.keymap.set('n', '<localleader>cl', ':CocList<CR>')
vim.keymap.set('n', '<localleader>cd', ':CocList diagnostics<CR>')
vim.keymap.set('n', '<localleader>cc', ':CocList commands<CR>')
vim.keymap.set('n', '<localleader>co', ':CocList outline<CR>')
vim.keymap.set('n', '<localleader>cs', ':CocList symbols<CR>')