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--
-- Completion configuration plugin
--
------------------------------------------------------------------------------------------------------------------------
-- Insert mode completion
------------------------------------------------------------------------------------------------------------------------
-- See `:help ins-completion-menu`
vim.opt.autocomplete = true -- Show completion menu automatically
vim.opt.completeopt = {
"noselect", -- No item selected initially
"fuzzy",
"menuone", -- Show matches in a menu, even if there's only one match
"popup", -- Menu items show extra info in the popup window
}
-- Completion sources (in order of priority)
vim.opt.complete = {
"o", -- 'omnifunc'
}
vim.opt.pumwidth = 25
vim.keymap.set("i", "<Tab>", function()
return vim.fn.pumvisible() == 1 and "<C-n>" or "<Tab>"
end, { expr = true })
vim.keymap.set("i", "<S-Tab>", function()
return vim.fn.pumvisible() == 1 and "<C-p>" or "<S-Tab>"
end, { expr = true })
-- Jump between snippet placeholders, falling back to native behavior when no snippet is active
vim.keymap.set({ "i", "s" }, "<C-n>", function()
return vim.snippet.active({ direction = 1 }) and "<Cmd>lua vim.snippet.jump(1)<CR>" or "<C-n>"
end, { expr = true })
vim.keymap.set({ "i", "s" }, "<C-p>", function()
return vim.snippet.active({ direction = -1 }) and "<Cmd>lua vim.snippet.jump(-1)<CR>" or "<C-p>"
end, { expr = true })
------------------------------------------------------------------------------------------------------------------------
-- Snippet expansion fallback
------------------------------------------------------------------------------------------------------------------------
-- Work around Neovim's snippet grammar rejecting placeholder defaults that mix text with nested tabstops (e.g. lua_ls's
-- `${1:pairs(${2:t})}`): the `any_or_text` rule matches a single node, not a `(any + text)^1` sequence. On parse failure,
-- strip the snippet markup and insert it as plain text instead of throwing. Remove once fixed upstream.
-- The `@as table` cast retypes the module here so overriding `expand` isn't flagged as a duplicate field set.
local snippet = vim.snippet --[[@as table]]
local orig_expand = snippet.expand
-- Reduce LSP snippet syntax to plain text: keep placeholder/variable defaults, the first choice, drop bare tabstops.
local function strip_snippet(s)
local prev
repeat
prev = s
s = s:gsub("%$(%b{})", function(group)
local body = group:sub(2, -2)
local choice = body:match("^%d+|(.*)|$")
if choice then
return (choice:gsub(",.*$", "")) -- first choice
end
local default = body:match("^[%w_]+:(.*)$")
if default then
return default -- ${n:default} / ${VAR:default}
end
return "" -- bare ${n} / ${VAR}
end)
until s == prev
s = s:gsub("%$[%w_]+", "") -- bare $n / $VAR
s = s:gsub("\\([%$}{|,\\])", "%1") -- unescape
return s
end
local function insert_plain(text)
local win = vim.api.nvim_get_current_win()
local row, col = unpack(vim.api.nvim_win_get_cursor(win))
local indent = vim.api.nvim_get_current_line():match("^%s*") or ""
local lines = vim.split(text, "\n", { plain = true })
for i = 2, #lines do
lines[i] = indent .. lines[i]
end
vim.api.nvim_buf_set_text(0, row - 1, col, row - 1, col, lines)
local last = #lines
local new_row = row - 1 + (last - 1)
local new_col = last == 1 and col + #lines[1] or #lines[last]
vim.api.nvim_win_set_cursor(win, { new_row + 1, new_col })
end
snippet.expand = function(input)
local ok = pcall(orig_expand, input)
if not ok then
insert_plain(strip_snippet(input))
vim.notify("Snippet parse failed, inserted as plain text: " .. vim.inspect(input), vim.log.levels.WARN)
end
end
------------------------------------------------------------------------------------------------------------------------
-- Command-line mode completion
------------------------------------------------------------------------------------------------------------------------
-- See `:help cmdline-completion` and `:help cmdline-autocompletion`
-- Show completion menu automatically
vim.api.nvim_create_autocmd({ "CmdlineChanged", "CmdlineEnter" }, {
desc = "Autocompletion",
group = vim.g.dotfiles.augroup,
pattern = "[:\\/\\?]",
callback = function()
vim.fn.wildtrigger()
end,
})
vim.opt.wildmenu = true -- Show completions in a menu
vim.opt.wildchar = 9 -- Char code assigned to command line wildcard expansion
vim.opt.pumborder = "rounded"
vim.opt.wildoptions = {
"exacttext", -- Discard regex artifacts when performing search pattern completion
"pum", -- Show completions in a popup menu
"tagfile", -- Show tag kind and file
"fuzzy", -- Fuzzy matching (doesn't work with files/dirs, see `:help 'wildoptions'`, but patterns do work!)
}
-- Completion modes triggered in order by `wildtrigger()` or 'wildchar'
vim.opt.wildmode = {
"noselect", -- List matches without inserting
"full", -- List matches and insert first full match
}
-- Insert unique match
vim.keymap.set("c", string.format("%c", vim.o.wildchar), function()
local complete_info = vim.fn.cmdcomplete_info()
if complete_info.pum_visible == 1 then
return #complete_info.matches == 1 and "<C-n><Space><BS>" or "<C-n>"
end
vim.fn.wildtrigger()
end, { expr = true, desc = "Command line wildcard expansion" })
-- Show next completion choices after accepting an entry with `<C-y>`
vim.keymap.set("c", "<C-y>", function()
local complete_info = vim.fn.cmdcomplete_info()
if complete_info.pum_visible == 1 then
return complete_info.selected ~= -1 and "<Space><BS>" or "<C-e>"
end
return "<C-y>"
end, { expr = true })
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