-- https://raw.githubusercontent.com/neoclide/coc.nvim/master/doc/coc-example-config.lua

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

-- Having longer updatetime (default is 4000 ms = 4s) leads to noticeable
-- delays and poor user experience
vim.opt.updatetime = 300

-- Always show the signcolumn, otherwise it would shift the text each time
-- diagnostics appeared/became resolved
vim.opt.signcolumn = "yes"

local keyset = vim.keymap.set
-- Autocomplete
function _G.check_back_space()
    local col = vim.fn.col('.') - 1
    return col == 0 or vim.fn.getline('.'):sub(col, col):match('%s') ~= nil
end

-- Use Tab for trigger completion with characters ahead and navigate
-- NOTE: There's always a completion item selected by default, you may want to enable
-- no select by setting `"suggest.noselect": true` in your configuration file
-- NOTE: Use command ':verbose imap <tab>' to make sure Tab is not mapped by
-- other plugins before putting this into your config
local opts = {silent = false, noremap = true, expr = true, replace_keycodes = false}
keyset("i", "<TAB>", 'coc#pum#visible() ? coc#pum#next(1) : v:lua.check_back_space() ? "<TAB>" : coc#refresh()', opts)
keyset("i", "<S-TAB>", [[coc#pum#visible() ? coc#pum#prev(1) : "\<C-h>"]], opts)

-- Make <CR> to accept selected completion item or notify coc.nvim to format
-- <C-g>u breaks current undo, please make your own choice
keyset("i", "<cr>", [[coc#pum#visible() ? coc#pum#confirm() : "\<C-g>u\<CR>\<c-r>=coc#on_enter()\<CR>"]], opts)

-- Use <c-space> to trigger completion
keyset("i", "<c-space>", "coc#refresh()", {silent = true, expr = true})