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--- *mini.completion* Completion and signature help
--- *MiniCompletion*
--- MIT License Copyright (c) 2021 Evgeni Chasnovski
--- ==============================================================================
--- Key design ideas:
--- - Have an async (with customizable "debounce" delay) "two-stage chain
---   completion": first try to get completion items from LSP client (if set
---   up) and if no result, fallback to custom action.
--- - Managing completion is done as much with Neovim's built-in tools as
---   possible.
--- Features:
--- - Two-stage chain completion:
---     - First stage is an LSP completion implemented via
---       |MiniCompletion.completefunc_lsp()|. It should be set up as either
---       |completefunc| or |omnifunc|. It tries to get completion items from
---       LSP client (via 'textDocument/completion' request). Custom
---       preprocessing of response items is possible (with
---       `MiniCompletion.config.lsp_completion.process_items`), for example
---       with fuzzy matching. By default items which are not snippets and
---       directly start with completed word are kept and sorted according to

8000
---       LSP specification. Supports `additionalTextEdits`, like auto-import
---       and others (see 'Notes').
---     - 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 (see |ins-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). After
---   opening, window for signature help is fixed and is closed when there is
---   nothing to show, text is different or
---   when leaving Insert mode.
--- - 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
---   |MiniCompletion.complete_twostage()| (by default is mapped to
---   `<C-Space>`) or fallback completion via
---   |MiniCompletion.complete_fallback()| (maped to `<M-Space>`).
--- What it doesn't do:
--- - Snippet expansion.
--- - Many configurable sources.
--- - Automatic mapping of `<CR>`, `<Tab>`, etc., as those tend to have highly
---   variable user expectations. See 'Helpful key mappings' for suggestions.
--- # Setup~
--- This module needs a setup with `require('mini.completion').setup({})`
--- (replace `{}` with your `config` table). It will create global Lua table
--- `MiniCompletion` which you can use for scripting or manually (with
--- `:lua MiniCompletion.*`).
--- See |MiniCompletion.config| for `config` structure and default values.
--- You can override runtime config settings locally to buffer inside
--- `vim.b.minicompletion_config` which should have same structure as
--- `MiniCompletion.config`. See |mini.nvim-buffer-local-config| for more details.
--- # Notes~
--- - More appropriate, albeit slightly advanced, LSP completion setup is to set
---   it not on every `BufEnter` event (default), but on every attach of LSP
---   client. To do that:
---     - Use in initial config:
---     `lsp_completion = {source_func = 'omnifunc', auto_setup = false}`.
---     - In `on_attach()` of every LSP client set 'omnifunc' option to exactly
---       `v:lua.MiniCompletion.completefunc_lsp`.
--- - If you have trouble using custom (overriden) |vim.ui.input| (like from
---   'stevearc/dressing.nvim'), make automated disable of 'mini.completion'
---   for input buffer. For example, currently for 'dressing.nvim' it can be
---   with `au FileType DressingInput lua vim.b.minicompletion_disable = true`.
--- - Support of `additionalTextEdits` tries to handle both types of servers:
---     - When `additionalTextEdits` are supplied in response to
---       'textDocument/completion' request (like currently in 'pyright').
---     - When `additionalTextEdits` are supplied in response to
---       'completionItem/resolve' request (like currently in
---       'typescript-language-server'). In this case to apply edits user needs
---       to trigger such request, i.e. select completion item and wait for
---       `MiniCompletion.config.delay.info` time plus server response time.
--- # Comparisons~
--- - 'nvim-cmp':
---     - More complex design which allows multiple sources each in form of
---       separate plugin. `MiniCompletion` has two built in: LSP and fallback.
---     - Supports snippet expansion.
---     - Doesn't have customizable delays for basic actions.
---     - Doesn't allow fallback action.
---     - Doesn't provide signature help.
--- # Helpful key mappings~
--- To use `<Tab>` and `<S-Tab>` for navigation through completion list, make
--- these key mappings:
--- `vim.keymap.set('i', '<Tab>',   [[pumvisible() ? "\<C-n>" : "\<Tab>"]],   { expr = true })`
--- `vim.keymap.set('i', '<S-Tab>', [[pumvisible() ? "\<C-p>" : "\<S-Tab>"]], { expr = true })`
--- To get more consistent behavior of `<CR>`, you can use this template in
--- your 'init.lua' to make customized mapping: >
---   local keys = {
---     ['cr']        = vim.api.nvim_replace_termcodes('<CR>', true, true, true),
---     ['ctrl-y']    = vim.api.nvim_replace_termcodes('<C-y>', true, true, true),
---     ['ctrl-y_cr'] = vim.api.nvim_replace_termcodes('<C-y><CR>', true, true, true),
---   _G.cr_action = function()
---     if vim.fn.pumvisible() ~= 0 then
---       -- If popup is visible, confirm selected item or add new line otherwise
---       local item_selected = vim.fn.complete_info()['selected'] ~= -1
---       return item_selected and keys['ctrl-y'] or keys['ctrl-y_cr']
---     else
---       -- If popup is not visible, use plain `<CR>`. You might want to customize
---       -- according to other plugins. For example, to use 'mini.pairs', replace
---       -- next line with `return require('mini.pairs').cr()`
---       return keys['cr']
---     end
---   vim.keymap.set('i', '<CR>', 'v:lua._G.cr_action()', { expr = true })
--- # Highlight groups~
--- * `MiniCompletionActiveParameter` - highlighting of signature active parameter.
---   By default displayed as plain underline.
--- To change any highlight group, modify it directly with |:highlight|.
--- # Disabling~
--- To disable, set `vim.g.minicompletion_disable` (globally) or
--- `vim.b.minicompletion_disable` (for a buffer) to `true`. Considering high
--- number of different scenarios and customization intentions, writing exact
--- rules for disabling module's functionality is left to user. See
--- |mini.nvim-disabling-recipes| for common recipes.
-- Overall implementation design:
-- - Complet
8000
ion:
--     - On `InsertCharPre` event try to start auto completion. If needed,
--       start timer which after delay will start completion process. Stop this
--       timer if it is not needed.
--     - When timer is activated, first execute LSP source (if set up and there
--       is an active LSP client) by calling built-in complete function
--       (`completefunc` or `omnifunc`) which tries LSP completion by
--       asynchronously sending LSP 'textDocument/completion' request to all
--       LSP clients. When all are done, execute callback which processes
--       results, stores them in LSP cache and reruns built-in complete
--       function which produces completion popup.
--     - If previous step didn't result into any completion, execute (in Insert
--       mode and if no popup) fallback action.
-- - Documentation:
--     - On `CompleteChanged` start auto info with similar to completion timer
--       pattern.
--     - If timer is activated, try these sources of item info:
--         - 'info' field of completion item (see `:h complete-items`).
--         - 'documentation' field of LSP's previously returned result.
--         - 'documentation' field in result of asynchronous
--           'completeItem/resolve' LSP request.
--     - If info doesn't consist only from whitespace, show floating window
--       with its content. Its dimensions and position are computed based on
--       current state of Neovim's data and content itself (which will be
--       displayed wrapped with `linebreak` option).
-- - Signature help (similar to item info):
--     - On `CursorMovedI` start auto signature (if there is any active LSP
--       client) with similar to completion timer pattern. Better event might
--       be `InsertCharPre` but there are issues with 'autopair-type' plugins.
--     - Check if character left to cursor is appropriate (')' or LSP's
--       signature help trigger characters). If not, do nothing.
--     - If timer is activated, send 'textDocument/signatureHelp' request to
--       all LSP clients. On callback, process their results. Window is opened
--       if not already with the same text (its characteristics are computed
--       similar to item info). For every LSP client it shows only active
--       signature (in case there are many). If LSP response has data about
--       active parameter, it is highlighted with
--       `MiniCompletionActiveParameter` highlight group.
-- Module definition ==========================================================
local MiniCompletion = {}
local H = {}
--- Module setup
---@param config table|nil Module config table. See |MiniCompletion.config|.
---@usage `require('mini.completion').setup({})` (replace `{}` with your `config` table)
MiniCompletion.setup = function(config)
  -- Export module
  _G.MiniCompletion = MiniCompletion
  -- Setup config
  config = H.setup_config(config)
  -- Apply config
  H.apply_config(config)
  -- Define behavior
  H.create_autocommands(config)
  -- Create default highlighting
  H.create_default_hl()
--- Module config
--- Default values:
---@eval return MiniDoc.afterlines_to_code(MiniDoc.current.eval_section)
MiniCompletion.config = {
  -- 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,
    -- `process_items` should be a function which takes LSP
    -- 'textDocument/completion' response items and word to complete. Its
    -- output should be a table of the same nature as input items. The most
    -- common use-cases are custom filtering and sorting. You can use
    -- default `process_items` as `MiniCompletion.default_process_items()`.
    --minidoc_replace_start process_items = --<function: filters out snippets; sorts by LSP specs>,
    process_items = function(items, base)
      local res = vim.tbl_filter(function(item)
        -- Keep items which match the base and are not snippets
        return vim.startswith(H.get_completion_word(item), base) and item.kind ~= 15
      end, items)
      table.sort(res, function(a, b) return (a.sortText or a.label) < (b.sortText or b.label) end)
      return res
    --minidoc_replace_end
  -- 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>'.
  --minidoc_replace_start fallback_action = --<function: like `<C-n>` completion>,
  fallback_action = function() vim.api.nvim_feedkeys(H.keys.ctrl_n, 'n', false) end,
  --minidoc_replace_end
  -- 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,
--minidoc_afterlines_end
-- Module functionality =======================================================
--- Run two-stage completion
---@param fallback boolean|nil Whether to use fallback completion. Default: `true`.
---@param force boolean|nil Whether to force update of completion popup.
---   Default: `true`.
MiniCompletion.complete_twostage = function(fallback, force)
  if H.is_disabled() then return end
  if fallback == nil then fallback = true end
  if force == nil then force = true end
  H.stop_completion()
  H.completion.fallback, H.completion.force = fallback, force
  H.trigger_twostep()
--- Run fallback completion
MiniCompletion.complete_fallback = function()
  if H.is_disabled() then return end
  H.stop_completion()
  H.completion.fallback, H.completion.force = true, true
  H.trigger_fallback()
--- Stop actions
--- This stops currently active (because of module delay or LSP answer delay)
--- actions.
--- Designed to be used with |autocmd|. No need to use it directly, everything
--- is setup in |MiniCompletion.setup|.
---@param actions table|nil Array containing any of 'completion', 'info', or
---   'signature' string. Default: array containing all of them.
MiniCompletion.stop = function(actions)
  actions = actions or { 'completion', 'info', 'signature' }
  for _, n in pairs(actions) do
    H.stop_actions[n]()
--- Module's |complete-function|
--- This is the main function which enables two-stage completion. It should be
--- set as one of |completefunc| or |omnifunc|.
--- No need to use it directly, everything is setup in |MiniCompletion.setup|.
MiniCompletion.completefunc_lsp = function(findstart, base)
  -- Early return
  if not H.has_lsp_clients('completionProvider') or H.completion.lsp.status == 'sent' then
    if findstart == 1 then
      return -3
      return {}
  -- NOTE: having code for request inside this function enables its use
  -- directly with `<C-x><...>`.
  if H.completion.lsp.status ~= 'received' then
    local current_id = H.completion.lsp.id + 1
    H.completion.lsp.id = current_id
    H.completion.lsp.status = 'sent'
    local bufnr = vim.api.nvim_get_current_buf()
    local params = vim.lsp.util.make_position_params()
    -- NOTE: it is CRUCIAL to make LSP request on the first call to
    -- 'complete-function' (as in Vim's help). This is due to the fact that
    -- cursor line and position are different on the first and second calls to
    -- 'complete-function'. For example, when calling this function at the end
    -- of the line '  he', cursor position on the first call will be
    -- (<linenum>, 4) and line will be '  he' but on the second call -
    -- (<linenum>, 2) and '  ' (because 2 is a column of completion start).
    -- This request is executed only on second call because it returns `-3` on
    -- first call (which means cancel and leave completion mode).
    -- NOTE: using `buf_request_all()` (instead of `buf_request()`) to easily
    -- handle possible fallback and to have all completion suggestions be
    -- filtered with one `base` in the other route of this function. Anyway,
    -- the most common situation is with one attached LSP client.
    local cancel_fun = vim.lsp.buf_request_all(bufnr, 'textDocument/completion', params, function(result)
      if not H.is_lsp_current(H.completion, current_id) then return end
      H.completion.lsp.status = 'received'
      H.completion.lsp.result = result
      -- Trigger LSP completion to take 'received' route
      H.trigger_lsp()
    -- Cache cancel function to disable requests when they are not needed
    H.completion.lsp.cancel_fun = cancel_fun
    -- End completion and wait for LSP callback
    if findstart == 1 then
      return -3
      return {}
    if findstart == 1 then return H.get_completion_start() end
    local config = H.get_config()
    local words = H.process_lsp_response(H.completion.lsp.result, function(response, client_id)
      -- Response can be `CompletionList` with 'items' field or `CompletionItem[]`
      local items = H.table_get(response, { 'items' }) or response
      if type(items) ~= 'table' then return {} end
      items = config.lsp_completion.process_items(items, base)
      return H.lsp_completion_response_items_to_complete_items(items, client_id)
    H.completion.lsp.status = 'done'
    -- Maybe trigger fallback action
    if vim.tbl_isempty(words) and H.completion.fallback then
      H.trigger_fallback()
      return
    -- Track from which source is current popup
    H.completion.source = 'lsp'
    return words
--- Default `MiniCompletion.config.lsp_completion.process_items`
MiniComp
10000
letion.default_process_items =
  function(items, base) return H.default_config.lsp_completion.process_items(items, base) end
-- Helper data ================================================================
-- Module default config
H.default_config = MiniCompletion.config
-- Track Insert mode changes
H.text_changed_id = 0
-- Namespace for highlighting
H.ns_id = vim.api.nvim_create_namespace('MiniCompletion')
-- Commonly used key sequences
  completefunc = vim.api.nvim_replace_termcodes('<C-x><C-u>', true, false, true),
  omnifunc = vim.api.nvim_replace_termcodes('<C-x><C-o>', true, false, true),
  ctrl_n = vim.api.nvim_replace_termcodes('<C-g><C-g><C-n>', true, false, true),
-- Caches for different actions -----------------------------------------------
-- Field `lsp` is a table describing state of all used LSP requests. It has the
-- following structure:
-- - id: identifier (consecutive numbers).
-- - status: status. One of 'sent', 'received', 'done', 'canceled'.
-- - result: result of request.
-- - cancel_fun: function which cancels current request.
-- Cache for completion
H.completion = {
  fallback = true,
  force = false,
  source = nil,
  text_changed_id = 0,
  timer = vim.loop.new_timer(),
  lsp = { id = 0, status = nil, result = nil, cancel_fun = nil },
-- Cache for completion item info
  bufnr = nil,
  event = nil,
  timer = vim.loop.new_timer(),
  winnr = nil,
  lsp = { id = 0, status = nil, result = nil, cancel_fun = nil },
-- Cache for signature help
H.signature = {
  bufnr = nil,
  text = nil,
  timer = vim.loop.new_timer(),
  winnr = nil,
  lsp = { id = 0, status = nil, result = nil, cancel_fun = nil },
-- Helper functionality =======================================================
-- Settings -------------------------------------------------------------------
H.setup_config = function(config)
  -- General idea: if some table elements are not present in user-supplied
  -- `config`, take them from default config
  vim.validate({ config = { config, 'table', true } })
  config = vim.tbl_deep_extend('force', H.default_config, config or {})
  -- Validate per nesting level to produce correct error message
  vim.validate({
    delay = { config.delay, 'table' },
    window = { config.window, 'table' },
    lsp_completion = { config.lsp_completion, 'table' },
    fallback_action = {
      config.fallback_action,
      function(x) return type(x) == 'function' or type(x) == 'string' end,
      'function or string',
    mappings = { config.mappings, 'table' },
    set_vim_settings = { config.set_vim_settings, 'boolean' },
  vim.validate({
    ['delay.completion'] = { config.delay.completion, 'number' },
    ['delay.info'] = { config.delay.info, 'number' },
    ['delay.signature'] = { config.delay.signature, 'number' },
    ['window.info'] = { config.window.info, 'table' },
    ['window.signature'] = { config.window.signature, 'table' },
    ['lsp_completion.source_func'] = {
      config.lsp_completion.source_func,
      function(x) return x == 'completefunc' or x == 'omnifunc' end,
      'one of strings: "completefunc" or "omnifunc"',
    ['lsp_completion.auto_setup'] = { config.lsp_completion.auto_setup, 'boolean' },
    ['lsp_completion.process_items'] = { config.lsp_completion.process_items, 'function' },
    ['mappings.force_twostep'] = { config.mappings.force_twostep, 'string' },
    ['mappings.force_fallback'] = { config.mappings.force_fallback, 'string' },
  local is_string_or_array = function(x) return type(x) == 'string' or vim.tbl_islist(x) end
  vim.validate({
    ['window.info.height'] = { config.window.info.height, 'number' },
    ['window.info.width'] = { config.window.info.width, 'number' },
    ['window.info.border'] = {
      config.window.info.border,
      is_string_or_array,
      '(mini.completion) `config.window.info.border` can be either string or array.',
    ['window.signature.height'] = { config.window.signature.height, 'number' },
    ['window.signature.width'] = { config.window.signature.width, 'number' },
    ['window.signature.border'] = {
      config.window.signature.border,
      is_string_or_array,
      '(mini.completion) `config.window.signature.border` can be either string or array.',
  return config
H.apply_config = function(config)
  MiniCompletion.config = config
  --stylua: ignore start
  H.map('i', config.mappings.force_twostep, MiniCompletion.complete_twostage, { desc = 'Complete with two-stage' })
  H.map('i', config.mappings.force_fallback, MiniCompletion.complete_fallback, { desc = 'Complete with fallback' })
  --stylua: ignore end
  if config.set_vim_settings then
    -- Don't give ins-completion-menu messages
    vim.opt.shortmess:append('c')
    -- More common completion behavior
    vim.o.completeopt = 'menuone,noinsert,noselect'
H.create_autocommands = function(config)
  local augroup = vim.api.nvim_create_augroup('MiniCompletion', {})
  local au = function(event, pattern, callback, desc)
    vim.api.nvim_create_autocmd(event, { group = augroup, pattern = pattern, callback = callback, desc = desc })
  au('InsertCharPre', '*', H.auto_completion, 'Auto show completion')
  au('CompleteChanged', '*', H.auto_info, 'Auto show info')
  au('CursorMovedI', '*', H.auto_signature, 'Auto show signature')
  au('InsertLeavePre', '*', function() MiniCompletion.stop() end, 'Stop completion')
  au('CompleteDonePre', '*', H.on_completedonepre, 'On CompleteDonePre')
  au('TextChangedI', '*', H.on_text_changed_i, 'On TextChangedI')
  au('TextChangedP', '*', H.on_text_changed_p, 'On TextChangedP')
  if config.lsp_completion.auto_setup then
      'BufEnter',
      function() vim.bo[config.lsp_completion.source_func] = 'v:lua.MiniCompletion.completefunc_lsp' end,
      'Set completion function'
  au('ColorScheme', '*', H.create_default_hl, 'Ensure proper colors')
  au('FileType', 'TelescopePrompt', function() vim.b.minicompletion_disable = true end, 'Disable locally')
H.create_default_hl =
  function() vim.api.nvim_set_hl(0, 'MiniCompletionActiveParameter', { default = true, underline = true }) end
H.is_disabled = function() return vim.g.minicompletion_disable == true or vim.b.minicompletion_disable == true end
H.get_config = function(config)
  return vim.tbl_deep_extend('force', MiniCompletion.config, vim.b.minicompletion_config or {}, config or {})
-- Autocommands ---------------------------------------------------------------
H.auto_completion = function()
  if H.is_disabled() then return end
  H.completion.timer:stop()
  -- Don't do anything if popup is visible
  if H.pumvisible() then
    -- Keep completion source as it is needed all time when popup is visible
    H.stop_completion(true)
  -- Stop everything if inserted character is not appropriate
  local char_is_trigger = H.is_lsp_trigger(vim.v.char, 'completion')
  if not (H.is_char_keyword(vim.v.char) or char_is_trigger) then
    H.stop_completion(false)
  -- If character is purely lsp trigger, make new LSP request without fallback
  -- and force new completion
  if char_is_trigger then H.cancel_lsp() end
  H.completion.fallback, H.completion.force = not char_is_trigger, char_is_trigger
  -- Cache id of Insert mode "text changed" event for a later tracking (reduces
  -- false positive delayed triggers). The intention is to trigger completion
  -- after the delay only if text wasn't changed during waiting. Using only
  -- `InsertCharPre` is not enough though, as not every Insert mode change
  -- triggers `InsertCharPre` event (notable example - hitting `<CR>`).
  -- Also, using `+ 1` here because it is a `Pre` event and needs to cache
  -- after inserting character.
  H.completion.text_changed_id = H.text_changed_id + 1
  -- If completion was requested after 'lsp' source exhausted itself (there
  -- were matches on typing start, but they disappeared during filtering), call
  -- fallback immediately.
  if H.completion.source == 'lsp' then
    H.trigger_fallback()
  -- Using delay (of debounce type) actually improves user experience
  -- as it allows fast typing without many popups.
  H.completion.timer:start(H.get_config().delay.completion, 0, vim.schedule_wrap(H.trigger_twostep))
H.auto_info = function()
  if H.is_disabled() then return end
  H.info.timer:stop()
  -- Defer execution because of textlock during `CompleteChanged` event
  -- Don't stop timer when closing info window because it is needed
  vim.defer_fn(function() H.close_action_window(H.info, true) end, 0)
  -- Stop current LSP request that tries to get not current data
  H.cancel_lsp({ H.info })
  -- Update metadata before leaving to register a `CompleteChanged` event
  H.info.event = vim.v.event
  H.info.id = H.info.id + 1
  -- Don't even try to show info if nothing is selected in popup
  if vim.tbl_isempty(H.info.event.completed_item) then return end
  H.info.timer:start(H.get_config().delay.info, 0, vim.schedule_wrap(H.show_info_window))
H.auto_signature = function()
  if H.is_disabled() then return end
  H.signature.timer:stop()
  if not H.has_lsp_clients('signatureHelpProvider') then return end
  local left_char = H.get_left_char()
  local char_is_trigger = left_char == ')' or H.is_lsp_trigger(left_char, 'signature')
  if not char_is_trigger then return end
  H.signature.timer:start(H.get_config().delay.signature, 0, vim.schedule_wrap(H.show_signature_window))
H.on_completedonepre = function()
  -- Try to apply additional text edits
  H.apply_additional_text_edits()
  -- Stop processes
  MiniCompletion.stop({ 'completion', 'info' })
H.on_text_changed_i = function()
  -- Track Insert mode changes
  H.text_changed_id = H.text_changed_id + 1
  -- Stop 'info' processes in case no completion event is triggered but popup
  -- is not visible. See https://github.com/neovim/neovim/issues/15077
  H.stop_info()
H.on_text_changed_p = function()
  -- Track Insert mode changes
  H.text_changed_id = H.text_changed_id + 1
-- Completion triggers --------------------------------------------------------
H.trigger_twostep = function()
  -- Trigger only in Insert mode and if text didn't change after trigger
  -- request, unless completion is forced
  -- NOTE: check for `text_changed_id` equality is still not 100% solution as
  -- there are cases when, for example, `<CR>` is hit just before this check.
  -- Because of asynchronous id update and this function call (called after
  -- delay), these still match.
  local allow_trigger = (vim.fn.mode() == 'i')
    and (H.completion.force or (H.completion.text_changed_id == H.text_changed_id))
  if not allow_trigger then return end
  if H.has_lsp_clients('completionProvider') and H.has_lsp_completion() then
    H.trigger_lsp()
  elseif H.completion.fallback then
    H.trigger_fallback()
H.trigger_lsp = function()
  -- Check for popup visibility is needed to reduce flickering.
  -- Possible issue timeline (with 100ms delay with set up LSP):
  -- 0ms: Key is pressed.
  -- 100ms: LSP is triggered from first key press.
  -- 110ms: Another key is pressed.
  -- 200ms: LSP callback is processed, triggers complete-function which
  --   processes "received" LSP request.
  -- 201ms: LSP request is processed, completion is (should be almost
  --   immediately) provided, request is marked as "done".
  -- 210ms: LSP is triggered from second key press. As previous request is
  --   "done", it will once make whole LSP request. Having check for visible
  --   popup should prevent here the call to complete-function.
  -- When `force` is `true` then presence of popup shouldn't matter.
  local no_popup = H.completion.force or (not H.pumvisible())
  if no_popup and vim.fn.mode() == 'i' then
    local key = H.keys[H.get_config().lsp_completion.source_func]
    vim.api.nvim_feedkeys(key, 'n', false)
H.trigger_fallback = function()
  local no_popup = H.completion.force or (not H.pumvisible())
  if no_popup and vim.fn.mode() == 'i' then
    -- Track from which source is current popup
    H.completion.source = 'fallback'
    local config = H.get_config()
    if type(config.fallback_action) == 'string' then
      -- Having `<C-g><C-g>` also (for some mysterious reason) helps to avoid
      -- some weird behavior. For example, if `keys = '<C-x><C-l>'` then Neovim
      -- starts new line when there is no suggestions.
      local keys = string.format('<C-g><C-g>%s', config.fallback_action)
      local trigger_keys = vim.api.nvim_replace_termcodes(keys, true, false, true)
      vim.api.nvim_feedkeys(trigger_keys, 'n', false)
      config.fallback_action()
-- Stop actions ---------------------------------------------------------------
H.stop_completion = function(keep_source)
  H.completion.timer:stop()
  H.cancel_lsp({ H.completion })
  H.completion.fallback, H.completion.force = true, false
  if not keep_source then H.completion.source = nil end
H.stop_info = function()
  -- Id update is needed to notify that all previous work is not current
  H.info.id = H.info.id + 1
  H.info.timer:stop()
  H.cancel_lsp({ H.info })
  H.close_action_window(H.info)
H.stop_signature = function()
  H.signature.text = nil
  H.signature.timer:stop()
  H.cancel_lsp({ H.signature })
  H.close_action_window(H.signature)
H.stop_actions = {
  completion = H.stop_completion,
  info = H.stop_info,
  signature = H.stop_signature,
-- LSP ------------------------------------------------------------------------
---@param capability string|table|nil Server capability (possibly nested
---   supplied via table) to check.
---@return boolean Whether at least one LSP client supports `capability`.
---@private
H.has_lsp_clients = function(capability)
  local clients = vim.lsp.buf_get_clients()
  if vim.tbl_isempty(clients) then return false end
  if not capability then return true end
  for _, c in pairs(clients) do
    local has_capability = H.table_get(c.server_capabilities, capability)
    if has_capability then return true end
  return false
H.has_lsp_completion = function()
  local func = vim.api.nvim_buf_get_option(0, H.get_config().lsp_completion.source_func)
  return func == 'v:lua.MiniCompletion.completefunc_lsp'
H.is_lsp_trigger = function(char, type)
  local triggers
  local providers = {
    completion = 'completionProvider',
    signature = 'signatureHelpProvider',
  for _, client in pairs(vim.lsp.buf_get_clients()) do
    triggers = H.table_get(client, { 'server_capabilities', providers[type], 'triggerCharacters' })
    if vim.tbl_contains(triggers or {}, char) then return true end
  return false
H.cancel_lsp = function(caches)
  caches = caches or { H.completion, H.info, H.signature }
  for _, c in pairs(caches) do
    if vim.tbl_contains({ 'sent', 'received' }, c.lsp.status) then
      if c.lsp.cancel_fun then c.lsp.cancel_fun() end
      c.lsp.status = 'canceled'
    c.lsp.result = nil
    c.lsp.cancel_fun = nil
H.process_lsp_response = function(request_result, processor)
  if not request_result then return {} end
  local res = {}
  for client_id, item in pairs(request_result) do
    if not item.err and item.result then vim.list_extend(res, processor(item.result, client_id) or {}) end
  return res
H.is_lsp_current = function(cache, id) return cache.lsp.id == id and cache.lsp.status == 'sent' end
-- Completion -----------------------------------------------------------------
-- This is a truncated version of
-- `vim.lsp.util.text_document_completion_list_to_complete_items` which does
-- not filter and sort items.
-- For extra information see 'Response' section:
-- https://microsoft.github.io/language-server-protocol/specifications/specification-3-14/#textDocument_completion
H.lsp_completion_response_items_to_complete_items = function(items, client_id)
  if vim.tbl_count(items) == 0 then return {} end
  local res = {}
  local docs, info
  for _, item in pairs(items) do
    -- Documentation info
    docs = item.documentation
    info = H.table_get(docs, { 'value' })
    if not info and type(docs) == 'string' then info = docs end
    info = info or ''
    table.insert(res, {
      word = H.get_completion_word(item),
      abbr = item.label,
      kind = vim.lsp.protocol.CompletionItemKind[item.kind] or 'Unknown',
      menu = item.detail or '',
      info = info,
      icase = 1,
      dup = 1,
      empty = 1,
      user_data = { nvim = { lsp = { completion_item = item, client_id = client_id } } },
  return res
H.get_completion_word = function(item)
  -- Completion word (textEdit.newText > insertText > label). This doesn't
  -- support snippet expansion.
  return H.table_get(item, { 'textEdit', 'newText' }) or item.insertText or item.label or ''
H.apply_additional_text_edits = function()
  -- Code originally.inspired by https://github.com/neovim/neovim/issues/12310
  -- Try to get `additionalTextEdits`. First from 'completionItem/resolve';
  -- then - from selected item. The reason for this is inconsistency in how
  -- servers provide `additionTextEdits`: on 'textDocument/completion' or
  -- 'completionItem/resolve'.
  local resolve_data = H.process_lsp_response(H.info.lsp.result, function(response, client_id)
    -- Return nested table because this will be a second argument of
    -- `vim.list_extend()` and the whole inner table is a target value here.
    return { { edits = response.additionalTextEdits, client_id = client_id } }
  local edits, client_id
  if #resolve_data >= 1 then
    edits, client_id = resolve_data[1].edits, resolve_data[1].client_id
    local lsp_data = H.table_get(vim.v.completed_item, { 'user_data', 'nvim', 'lsp' }) or {}
    edits = H.table_get(lsp_data, { 'completion_item', 'additionalTextEdits' })
    client_id = lsp_data.client_id
  if edits == nil then return end
  client_id = client_id or 0
  -- Use extmark to track relevant cursor postion after text edits
  local cur_pos = vim.api.nvim_win_get_cursor(0)
  local extmark_id = vim.api.nvim_buf_set_extmark(0, H.ns_id, cur_pos[1] - 1, cur_pos[2], {})
  local offset_encoding = vim.lsp.get_client_by_id(client_id).offset_encoding
  vim.lsp.util.apply_text_edits(edits, vim.api.nvim_get_current_buf(), offset_encoding)
  local extmark_data = vim.api.nvim_buf_get_extmark_by_id(0, H.ns_id, extmark_id, {})
  pcall(vim.api.nvim_buf_del_extmark, 0, H.ns_id, extmark_id)
  pcall(vim.api.nvim_win_set_cursor, 0, { extmark_data[1] + 1, extmark_data[2] })
-- Completion item info -------------------------------------------------------
H.show_info_window = function()
  local event = H.info.event
  if not event then return end
  -- Try first to take lines from LSP request result.
  local lines
  if H.info.lsp.status == 'received' then
    lines = H.process_lsp_response(H.info.lsp.result, function(response)
      if not response.documentation then return {} end
      local res = vim.lsp.util.convert_input_to_markdown_lines(response.documentation)
      return vim.lsp.util.trim_empty_lines(res)
    H.info.lsp.status = 'done'
    lines = H.info_window_lines(H.info.id)
  -- Don't show anything if there is nothing to show
  if not lines or H.is_whitespace(lines) then return end
  -- If not already, create a permanent buffer where info will be
  -- displayed. For some reason, it is important to have it created not in
  -- `setup()` because in that case there is a small flash (which is really a
  -- brief open of window at screen top, focus on it, and its close) on the
  -- first show of info window.
  H.ensure_buffer(H.info, 'MiniCompletion:completion-item-info')
  -- Add `lines` to info buffer. Use `wrap_at` to have proper width of
  -- 'non-UTF8' section separators.
  vim.lsp.util.stylize_markdown(H.info.bufnr, lines, { wrap_at = H.get_config().window.info.width })
  -- Compute floating window options
  local opts = H.info_window_options()
  -- Defer execution because of textlock during `CompleteChanged` event
  vim.defer_fn(function()
    -- Ensure that window doesn't open when it shouldn't be
    if not (H.pumvisible() and vim.fn.mode() == 'i') then return end
    H.open_action_window(H.info, opts)
H.info_window_lines = function(info_id)
  -- Try to use 'info' field of Neovim's completion item
  local completed_item = H.table_get(H.info, { 'event', 'completed_item' }) or {}
  local text = completed_item.info or ''
  if not H.is_whitespace(text) then
    -- Use `<text></text>` to be properly processed by `stylize_markdown()`
    local lines = { '<text>' }
    vim.list_extend(lines, vim.split(text, '\n', false))
    table.insert(lines, '</text>')
    return lines
  -- If popup is not from LSP then there is nothing more to do
  if H.completion.source ~= 'lsp' then return nil end
  -- Try to get documentation from LSP's initial completion result
  local lsp_completion_item = H.table_get(completed_item, { 'user_data', 'nvim', 'lsp', 'completion_item' })
  -- If there is no LSP's completion item, then there is no point to proceed as
  -- it should serve as parameters to LSP request
  if not lsp_completion_item then return end
  local doc = lsp_completion_item.documentation
  if doc then
    local lines = vim.lsp.util.convert_input_to_markdown_lines(doc)
    return vim.lsp.util.trim_empty_lines(lines)
  -- Finally, try request to resolve current completion to add documentation
  local bufnr = vim.api.nvim_get_current_buf()
  local params = lsp_completion_item
  local current_id = H.info.lsp.id + 1
  H.info.lsp.id = current_id
  H.info.lsp.status = 'sent'
  local cancel_fun = vim.lsp.buf_request_all(bufnr, 'completionItem/resolve', params, function(result)
    -- Don't do anything if there is other LSP request in action
    if not H.is_lsp_current(H.info, current_id) then return end
    H.info.lsp.status = 'received'
    -- Don't do anything if completion item was changed
    if H.info.id ~= info_id then return end
    H.info.lsp.result = result
    H.show_info_window()
  H.info.lsp.cancel_fun = cancel_fun

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