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--
-- 50-autocompletion.lua
--
-- * Configures autocompletion for insert mode and command-line mode.
-- In both modes:
-- * The list of completions shows up automatically
-- * Tab/Shift+Tab selects (and inserts) the next/previous item
-- In cmd-line mode:
-- * Tab selects a lone match outright, inserts it, closes the menu
-- (Useful when completing file names)
-- * CTRL+Y inserts the selection; with no selection it dismisses the menu
--
----------------------------------------------------------------------------------------------------
-- Insert mode autocompletion
----------------------------------------------------------------------------------------------------
local function i_select_next_menu_item()
return vim.fn.pumvisible() == 1 and "<C-n>" or "<Tab>"
end
local function i_select_previous_menu_item()
return vim.fn.pumvisible() == 1 and "<C-p>" or "<S-Tab>"
end
----------------------------------------------------------------------------------------------------
vim.opt.autocomplete = true -- Show completion menu automatically
vim.opt.completeopt = {
"noselect", -- No item selected initially
"menuone", -- Show matches in a menu, even if there's only one match
"popup", -- Menu items show extra info in the popup window
"fuzzy",
}
-- Completion sources (in order of priority)
vim.opt.complete = {
"o", -- 'omnifunc'
}
vim.keymap.set("i", "<Tab>", i_select_next_menu_item, { expr = true })
vim.keymap.set("i", "<S-Tab>", i_select_previous_menu_item, { expr = true })
----------------------------------------------------------------------------------------------------
-- Command-line mode autocompletion
----------------------------------------------------------------------------------------------------
-- `<Space><BS>` is a self-cancelling edit: it closes the menu, then `CmdLineChanged` fires and
-- tries to perform completion on the text before the cursor.
local function c_insert_unique_or_wildtrigger()
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
-- After navigating the command-line history, it takes two `wildtrigger()` calls to show the
-- menu. The first is performed by the `CmdLineChanged` autocommand, the second is performed
-- here.
vim.fn.wildtrigger()
return nil
end
local function c_accept_selection_or_dismiss()
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
----------------------------------------------------------------------------------------------------
-- Show completion menu automatically
vim.api.nvim_create_autocmd({ "CmdLineChanged", "CmdlineEnter" }, {
desc = "Autocompletion",
group = vim.g.dotfiles.augroup,
pattern = "[:\\/\\?]", -- Matches : commands plus / and ? searches, but not = and @
callback = function()
vim.fn.wildtrigger()
end,
})
vim.opt.wildmenu = true -- Show completions in a menu
vim.opt.wildchar = 9 -- Char code (`<Tab>`) assigned to command-line wildcard expansion
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 (except for files/dirs, use patterns)
}
-- 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
}
-- Converts `vim.opt.wildchar` char code into a key string that can be used by `vim.keymap.set()`.
local wildchar_key = string.format("%c", vim.o.wildchar)
vim.keymap.set("c", wildchar_key, c_insert_unique_or_wildtrigger, { expr = true })
vim.keymap.set("c", "<C-y>", c_accept_selection_or_dismiss, { expr = true })
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