Autocompletion and signature help plugin

• Async (with customizable 'debounce' delay) 'two-stage chain completion': first builtin LSP, then configurable fallback.
• Has functionality for completion item info and function signature (both in floating window appearing after customizable delay).

See more details in Features and help file.

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⦿ This is a part of mini.nvim library. Please use this link if you want to mention this module.

⦿ All contributions (issues, pull requests, discussions, etc.) are done inside of 'mini.nvim'.

⦿ See the repository page to learn about common design principles and configuration recipes.

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If you want to help this project grow but don't know where to start, check out contributing guides of 'mini.nvim' or leave a Github star for 'mini.nvim' project and/or any its standalone Git repositories.

Demo

demo-completion.mp4

Features

• Two-stage chain completion:
  • First stage is an LSP completion. Supports additionalTextEdits, like auto-import and others.
  • If first stage is not set up or resulted into no candidates, fallback action is executed. The most tested actions are Neovim's built-in insert completion.
• Automatic display in floating window of completion item info (via 'completionItem/resolve' request) and signature help (with highlighting of active parameter if LSP server provides such information).
• Automatic actions are done after some configurable amount of delay. This reduces computational load and allows fast typing (completion and signature help) and item selection (item info)
• User can force two-stage completion via or fallback completion.
• Highlighting of LSP kind (like "Function", "Keyword", etc.). Requires enabled 'mini.icons' (uses its "lsp" category) and Neovim>=0.11.

Dependencies

For full experience needs (still works without any of suggestions):

• Enabled 'mini.icons' module to highlight LSP kind (requires Neovim>=0.11). Otherwise MiniCompletion.default_process_items() does not add highlighting. Also take a look at MiniIcons.tweak_lsp_kind().

Installation

This plugin can be installed as part of 'mini.nvim' library (recommended) or as a standalone Git repository.

There are two branches to install from:

• main (default, recommended) will have latest development version of plugin. All changes since last stable release should be perceived as being in beta testing phase (meaning they already passed alpha-testing and are moderately settled).
• stable will be updated only upon releases with code tested during public beta-testing phase in main branch.

Here are code snippets for some common installation methods (use only one):

With mini.deps

Github repo	Branch	Code snippet
'mini.nvim' library	Main	Follow recommended 'mini.deps' installation
	Stable
Standalone plugin	Main	add('echasnovski/mini.completion')
	Stable	add({ source = 'echasnovski/mini.completion', checkout = 'stable' })

With folke/lazy.nvim

Github repo	Branch	Code snippet
'mini.nvim' library	Main	{ 'echasnovski/mini.nvim', version = false },
	Stable	{ 'echasnovski/mini.nvim', version = '*' },
Standalone plugin	Main	{ 'echasnovski/mini.completion', version = false },
	Stable	{ 'echasnovski/mini.completion', version = '*' },

With junegunn/vim-plug

Github repo	Branch	Code snippet
'mini.nvim' library	Main	Plug 'echasnovski/mini.nvim'
	Stable	Plug 'echasnovski/mini.nvim', { 'branch': 'stable' }
Standalone plugin	Main	Plug 'echasnovski/mini.completion'
	Stable	Plug 'echasnovski/mini.completion', { 'branch': 'stable' }

Important: don't forget to call require('mini.completion').setup() to enable its functionality.

Note: if you are on Windows, there might be problems with too long file paths (like error: unable to create file <some file name>: Filename too long). Try doing one of the following:

• Enable corresponding git global config value: git config --system core.longpaths true. Then try to reinstall.
• Install plugin in other place with shorter path.

Default config

-- No need to copy this inside `setup()`. Will be used automatically.
{
  -- Delay (debounce type, in ms) between certain Neovim event and action.
  -- This can be used to (virtually) disable certain automatic actions by
  -- setting very high delay time (like 10^7).
  delay = { completion = 100, info = 100, signature = 50 },

  -- Configuration for action windows:
  -- - `height` and `width` are maximum dimensions.
  -- - `border` defines border (as in `nvim_open_win()`).
  window = {
    info = { height = 25, width = 80, border = 'none' },
    signature = { height = 25, width = 80, border = 'none' },
  },

  -- Way of how module does LSP completion
  lsp_completion = {
    -- `source_func` should be one of 'completefunc' or 'omnifunc'.
    source_func = 'completefunc',

    -- `auto_setup` should be boolean indicating if LSP completion is set up
    -- on every `BufEnter` event.
    auto_setup = true,

    -- A function which takes LSP 'textDocument/completion' response items
    -- and word to complete. Output should be a table of the same nature as
    -- input items. Common use case is custom filter/sort.
    process_items = --<function: MiniCompletion.default_process_items>,
  },

  -- Fallback action. It will always be run in Insert mode. To use Neovim's
  -- built-in completion (see `:h ins-completion`), supply its mapping as
  -- string. Example: to use 'whole lines' completion, supply '<C-x><C-l>'.
  fallback_action = --<function: like `<C-n>` completion>,

  -- Module mappings. Use `''` (empty string) to disable one. Some of them
  -- might conflict with system mappings.
  mappings = {
    force_twostep = '<C-Space>', -- Force two-step completion
    force_fallback = '<A-Space>', -- Force fallback completion
  },

  -- Whether to set Vim's settings for better experience (modifies
  -- `shortmess` and `completeopt`)
  set_vim_settings = true,
}

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