mini.nvim/lua/mini/cursorword.lua at main · tani/mini.nvim

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-- Documentation ==============================================================

--- Minimal and fast module for autohighlighting word under cursor with

--- customizable delay. Current word under cursor can be highlighted

--- differently. Highlighting is triggered only if current cursor character is

--- a |[:keyword:]|. "Word under cursor" is meant as in Vim's |<cword>|:

--- something user would get as 'iw' text object. Highlighting stops in insert

--- and terminal modes.

---

--- # Setup~

---

--- This module needs a setup with `require('mini.cursorword').setup({})`

--- (replace `{}` with your `config` table). It will create global Lua table

--- `MiniCursorword` which you can use for scripting or manually (with

--- `:lua MiniCursorword.*`).

---

--- See |MiniCursorword.config| for `config` structure and default values.

---

--- # Highlight groups~

---

--- * `MiniCursorword` - highlight group of cursor word. Default: plain underline.

--- * `MiniCursorwordCurrent` - highlight group of a current word under

--- cursor. It will be displayed on top of `MiniCursorword`

--- (so `:hi clear MiniCursorwordCurrent` will lead to showing

--- `MiniCursorword` highlight group). Note: To not highlight it, use

--- `:hi! MiniCursorwordCurrent gui=nocombine guifg=NONE guibg=NONE` .

---

--- To change any highlight group, modify it directly with |:highlight|.

---

--- # Disabling~

---

--- To disable core functionality, set `g:minicursorword_disable` (globally) or

--- `b:minicursorword_disable` (for a buffer) to `v: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. Note: after disabling

--- there might be highlighting left; it will be removed after next

--- highlighting update.

---

--- Module-specific disabling:

--- - Don't show highlighting if cursor is on the word that is in a blocklist

--- of current filetype. In this example, blocklist for "lua" is "local" and

--- "require" words, for "javascript" - "import":

--- >

--- _G.cursorword_blocklist = function()

--- local curword = vim.fn.expand('<cword>')

--- local filetype = vim.api.nvim_buf_get_option(0, 'filetype')

---

--- -- Add any disabling global or filetype-specific logic here

--- local blocklist = {}

--- if filetype == 'lua' then

--- blocklist = { 'local', 'require' }

--- elseif filetype == 'javascript' then

--- blocklist = { 'import' }

--- end

---

--- vim.b.minicursorword_disable = vim.tbl_contains(blocklist, curword)

--- end

---

--- -- Make sure to add this autocommand *before* calling module's `setup()`.

--- vim.cmd('au CursorMoved * lua _G.cursorword_blocklist()')

---@tag mini.cursorword

---@tag MiniCursorword

---@toc_entry Highlight word under cursor

-- Module definition ==========================================================

local MiniCursorword = {}

local H = {}

--- Module setup

---

---@param config table Module config table. See |MiniCursorword.config|.

---

---@usage `require('mini.cursorword').setup({})` (replace `{}` with your `config` table)

function MiniCursorword.setup(config)

-- Export module

_G.MiniCursorword = MiniCursorword

-- Setup config

config = H.setup_config(config)

-- Apply config

H.apply_config(config)

-- Module behavior

vim.api.nvim_exec(

[[augroup MiniCursorword

au!

au CursorMoved * lua MiniCursorword.auto_highlight()

au InsertEnter,TermEnter,QuitPre * lua MiniCursorword.auto_unhighlight()

au FileType TelescopePrompt let b:minicursorword_disable=v:true

augroup END]],

false

)

if vim.fn.exists('##ModeChanged') == 1 then

vim.api.nvim_exec(

-- Call `auto_highlight` on mode change to respect `minicursorword_disable`

[[augroup MiniCursorword

au ModeChanged *:[^i] lua MiniCursorword.auto_highlight()

augroup END]],

false

)

end

-- Create highlighting

vim.api.nvim_exec(

[[hi default MiniCursorword cterm=underline gui=underline

hi default link MiniCursorwordCurrent MiniCursorword]],

false

)

end

--- Module config

---

--- 8000 Default values:

---@eval return MiniDoc.afterlines_to_code(MiniDoc.current.eval_section)

MiniCursorword.config = {

-- Delay (in ms) between when cursor moved and when highlighting appeared

delay = 100,

}

--minidoc_afterlines_end

-- Module functionality =======================================================

--- Auto highlight word under cursor

---

--- Designed to be used with |autocmd|. No need to use it directly,

--- everything is setup in |MiniCursorword.setup|.

function MiniCursorword.auto_highlight()

-- Stop any possible previous delayed highlighting

H.timer:stop()

-- Stop highlighting immediately if module is disabled when cursor is not on

-- 'keyword'

if H.is_disabled() or not H.is_cursor_on_keyword() then

H.unhighlight()

return

end

-- Get current information

local win_id = vim.api.nvim_get_current_win()

local win_match = H.window_matches[win_id] or {}

local curword = H.get_cursor_word()

-- Only immediately update highlighting of current word under cursor if

-- currently highlighted word equals one under cursor

if win_match.word == curword then

H.unhighlight(true)

H.highlight(true)

return

end

-- Stop highlighting previous match (if it exists)

H.unhighlight()

-- Delay highlighting

H.timer:start(

MiniCursorword.config.delay,

vim.schedule_wrap(function()

-- Ensure that always only one word is highlighted

H.unhighlight()

H.highlight()

end)

)

end

--- Auto unhighlight word under cursor

---

--- Designed to be used with |autocmd|. No need to use it directly, everything

--- is setup in |MiniCursorword.setup|.

function MiniCursorword.auto_unhighlight()

-- Stop any possible previous delayed highlighting

H.timer:stop()

H.unhighlight()

end

-- Helper data ================================================================

-- Module default config

H.default_config = MiniCursorword.config

-- Delay timer

H.timer = vim.loop.new_timer()

-- Information about last match highlighting (stored *per window*):

-- - Key: windows' unique buffer identifiers.

-- - Value: table with:

-- - `id` field for match id (from `vim.fn.matchadd()`).

-- - `word` field for matched word.

H.window_matches = {}

-- Helper functionality =======================================================

-- Settings -------------------------------------------------------------------

function H.setup_config(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 {})

vim.validate({ delay = { config.delay, 'number' } })

return config

end

function H.apply_config(config)

MiniCursorword.config = config

end

function H.is_disabled()

return vim.g.minicursorword_disable == true or vim.b.minicursorword_disable == true

end

-- Highlighting ---------------------------------------------------------------

---@param only_current boolean Whether to forcefuly highlight only current word

--- under cursor.

---@private

function H.highlight(only_current)

-- A modified version of https://stackoverflow.com/a/25233145

-- Using `matchadd()` instead of a simpler `:match` to tweak priority of

-- 'current word' highlighting: with `:match` it is higher than for

-- `incsearch` which is not convenient.

local win_id = vim.api.nvim_get_current_win()

if not vim.api.nvim_win_is_valid(win_id) then

return

end

H.window_matches[win_id] = H.window_matches[win_id] or {}

-- Add match highlight for current word under cursor with low priority

local match_id_current = vim.fn.matchadd('MiniCursorwordCurrent', [[\k*\%#\k*]], -1)

H.window_matches[win_id].id_current = match_id_current

-- Don't add main match id if not needed or if one is already present

if only_current or H.window_matches[win_id].id ~= nil then

return

end

-- Make highlighting for cursor word with pattern being 'very nomagic' ('\V')

-- and matching whole word ('\<' and '\>')

local curword = H.get_cursor_word()

local curpattern = string.format([[\V\<%s\>]], curword)

-- Add match highlight with even lower priority for current word to be on top

local match_id = vim.fn.matchadd('MiniCursorword', curpattern, -2)

-- Store information about highlight

H.window_matches[win_id].id = match_id

H.window_matches[win_id].word = curword

end

---@param only_current boolean Whether to remove highlighting only of current

--- word under cursor.

---@private

function H.unhighlight(only_current)

-- Don't do anything if there is no valid information to act upon

local win_id = vim.api.nvim_get_current_win()

local win_match = H.window_matches[win_id]

if not vim.api.nvim_win_is_valid(win_id) or win_match == nil then

return

end

-- Use `pcall` because there is an error if match id is not present. It can

-- happen if something else called `clearmatches`.

pcall(vim.fn.matchdelete, win_match.id_current)

H.window_matches[win_id].id_current = nil

if not only_current then

pcall(vim.fn.matchdelete, win_match.id)

H.window_matches[win_id] = nil

end

function H.is_cursor_on_keyword()

local col = vim.fn.col('.')

local curchar = vim.api.nvim_get_current_line():sub(col, col)

return vim.fn.match(curchar, '[[:keyword:]]') >= 0

end

function H.get_cursor_word()

return vim.fn.escape(vim.fn.expand('<cword>'), [[\/]])

end

return MiniCursorword

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