mini.nvim/lua/mini/comment.lua at main · alcpereira/mini.nvim

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--- *mini.comment* Comment lines

--- *MiniComment*

---

--- ==============================================================================

---

--- Features:

--- - Commenting in Normal mode respects |count| and is dot-repeatable.

---

--- - Comment structure by default is inferred from 'commentstring': either

--- from current buffer or from locally active tree-sitter language (only on

--- Neovim>=0.9). It can be customized via `options.custom_commentstring`

--- (see |MiniComment.config| for details).

---

--- - Allows custom hooks before and after successful commenting.

---

--- - Configurable options for some nuanced behavior.

---

--- What it doesn't do:

--- - Block and sub-line comments. This will only support per-line commenting.

---

--- - Handle indentation with mixed tab and space.

---

--- - Preserve trailing whitespace in empty lines.

---

--- Notes:

--- - To use tree-sitter aware commenting, global value of 'commentstring'

--- should be `''` (empty string). This is the default value in Neovim>=0.9,

--- so make sure to not set it manually.

---

--- # Setup ~

---

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

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

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

--- `:lua MiniComment.*`).

---

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

---

--- You can override runtime config settings locally to buffer inside

--- `vim.b.minicomment_config` which should have same structure as

--- `MiniComment.config`. See |mini.nvim-buffer-local-config| for more details.

---

--- # Disabling ~

---

--- To disable core functionality, set `vim.g.minicomment_disable` (globally) or

--- `vim.b.minicomment_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.

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

local MiniComment = {}

local H = {}

--- Module setup

---

---@param config table|nil Module config table. See |MiniComment.config|.

---

---@usage >lua

--- require('mini.comment').setup() -- use default config

--- -- OR

--- require('mini.comment').setup({}) -- replace {} with your config table

--- <

MiniComment.setup = function(config)

-- Export module

_G.MiniComment = MiniComment

-- Setup config

config = H.setup_config(config)

-- Apply config

H.apply_config(config)

end

--- Module config

---

< 10BC8 div>

--- Default values:

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

---@text # Options ~

---

--- ## Custom commentstring ~

---

--- `options.custom_commentstring` can be a function customizing 'commentstring'

--- option used to infer comment structure. It is called once before every

--- commenting action with the following arguments:

--- - `ref_position` - position at which to compute 'commentstring' (might be

--- relevant for a text with locally different commenting rules). Its structure

--- is the same as `opts.ref_position` in |MiniComment.toggle_lines()|.

---

--- Its output should be a valid 'commentstring' (string containing `%s`).

---

--- If not set or the output is `nil`, |MiniComment.get_commentstring()| is used.

---

--- For example, this option can be used to always use buffer 'commentstring'

--- even in case of present active tree-sitter parser: >lua

---

--- require('mini.comment').setup({

--- options = {

--- custom_commentstring = function() return vim.bo.commentstring end,

--- }

--- })

--- <

--- # Hooks ~

---

--- `hooks.pre` and `hooks.post` functions are executed before and after successful

--- commenting action (toggle or computing textobject). They will be called

--- with a single table argument which has the following fields:

--- - <action> `(string)` - action name. One of "toggle" (when actual toggle

--- direction is yet unknown), "comment", "uncomment", "textobject".

--- - <line_start> `(number|nil)` - action start line. Can be absent if yet unknown.

--- - <line_end> `(number|nil)` - action end line. Can be absent if yet unknown.

--- - <ref_position> `(table|nil)` - reference position.

---

--- Notes:

--- - Changing 'commentstring' in `hooks.pre` is allowed and will take effect.

--- - If hook returns `false`, any further action is terminated.

MiniComment.config = {

-- Options which control module behavior

options = {

-- Function to compute custom 'commentstring' (optional)

custom_commentstring = nil,

-- Whether to ignore blank lines when commenting

ignore_blank_line = false,

-- Whether to recognize as comment only lines without indent

start_of_line = false,

-- Whether to force single space inner padding for comment parts

pad_comment_parts = true,

-- Module mappings. Use `''` (empty string) to disable one.

mappings = {

-- Toggle comment (like `gcip` - comment inner paragraph) for both

-- Normal and Visual modes

comment = 'gc',

-- Toggle comment on current line

comment_line = 'gcc',

-- Toggle comment on visual selection

comment_visual = 'gc',

-- Define 'comment' textobject (like `dgc` - delete whole comment block)

-- Works also in Visual mode if mapping differs from `comment_visual`

textobject = 'gc',

-- Hook functions to be executed at certain stage of commenting

hooks = {

-- Before successful commenting. Does nothing by default.

pre = function() end,

-- After successful commenting. Does nothing by default.

post = function() end,

}

--minidoc_afterlines_end

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

--- Main function to be mapped

---

--- It is meant to be used in expression mappings (see |map-<expr>|) to enable

--- dot-repeatability and commenting on range. There is no need to do this

--- manually, everything is done inside |MiniComment.setup()|.

---

--- It has a somewhat unintuitive logic (because of how expression mapping with

--- dot-repeatability works): it should be called without arguments inside

--- expression mapping and with argument when action should be performed.

---

---@param mode string|nil Optional string with 'operatorfunc' mode (see |g@|).

---

---@return string|nil 'g@' if called without argument, '' otherwise (but after

--- performing action).

MiniComment.operator = function(mode)

if H.is_disabled() then return '' end

-- If used without arguments inside expression mapping:

-- - Set itself as `operatorfunc` to be called later to perform action.

-- - Return 'g@' which will then be executed resulting into waiting for a

-- motion or text object. This textobject will then be recorded using `'[`

-- and `']` marks. After that, `operatorfunc` is called with `mode` equal

-- to one of "line", "char", or "block".

-- NOTE: setting `operatorfunc` inside this function enables usage of 'count'

-- like `10gc_` toggles comments of 10 lines below (starting with current).

if mode == nil then

vim.o.operatorfunc = 'v:lua.MiniComment.operator'

return 'g@'

end

-- If called with non-nil `mode`, get target region and act on it

-- This also works in expression mapping in Visual mode, as `g@` seems to

-- place these marks on start and end of visual selection

local mark_left, mark_right = '[', ']'

local lnum_from, col_from = unpack(vim.api.nvim_buf_get_mark(0, mark_left))

local lnum_to, col_to = unpack(vim.api.nvim_buf_get_mark(0, mark_right))

-- Do nothing if "from" mark is after "to" (like in empty textobject)

if (lnum_from > lnum_to) or (lnum_from == lnum_to and col_from > col_to) then return end

-- NOTE: use cursor position as reference for possibly computing local

-- tree-sitter-based 'commentstring'. Recompute every time for a proper

-- dot-repeat. In Visual and sometimes Normal mode it uses left position.

local cursor = vim.api.nvim_win_get_cursor(0)

MiniComment.toggle_lines(lnum_from, lnum_to, { ref_position = { cursor[1], cursor[2] + 1 } })

return ''

end

--- Toggle comments between two line numbers

---

--- It uncomments if lines are comment (every line is a comment) and comments

--- otherwise. It respects indentation and doesn't insert trailing

--- whitespace. Toggle commenting not in visual mode is also dot-repeatable

--- and respects |count|.

---

--- # Notes ~

---

--- - Comment structure is inferred from buffer's 'commentstring' option or

--- local language of tree-sitter parser (if active; only on Neovim>=0.9).

---

--- - Call to this function will remove all |extmarks| from target range.

---

---@param line_start number Start line number (inclusive from 1 to number of lines).

---@param line_end number End line number (inclusive from 1 to number of lines).

---@param opts table|nil Options. Possible fields:

--- - <ref_position> `(table)` - A two-value array with `{ row, col }` (both

--- starting at 1) of reference position at which 'commentstring' value

--- will be computed. Default: `{ line_start, 1 }`.

MiniComment.toggle_lines = function(line_start, line_end, opts)

if H.is_disabled() then return end

opts = opts or {}

local ref_position = vim.deepcopy(opts.ref_position) or { line_start, 1 }

local n_lines = vim.api.nvim_buf_line_count(0)

if not (1 <= line_start and line_start <= n_lines and 1 <= line_end and line_end <= n_lines) then

error('(mini.comment) `line_start` and `line_end` should be within range [1; ' .. n_lines .. '].')

end

if not (line_start <= line_end) then

error('(mini.comment) `line_start` should be less than or equal to `line_end`.')

end

local config = H.get_config()

local hook_arg = { action = 'toggle', line_start = line_start, line_end = line_end, ref_position = ref_position }

if config.hooks.pre(hook_arg) == false then return end

local parts = H.get_comment_parts(ref_position, config.options)

local lines = vim.api.nvim_buf_get_lines(0, line_start - 1, line_end, false)

local indent, is_comment = H.get_lines_info(lines, parts, config.options)

local f = is_comment and H.make_uncomment_function(parts) or H.make_comment_function(parts, indent, config.options)

-- NOTE: Direct of `nvim_buf_set_lines()` essentially removes (squashes to

-- empty range at either side of the region) both regular and extended marks

-- inside region. It can be resolved at least in the following ways:

-- 1. Use `lockmarks`. Preserves regular but does nothing for extmarks.

-- 2. Use `vim.fn.setline(line_start, new_lines)`. Preserves regular marks,

-- but squashes extmarks within a single line.

-- 3. Refactor to use precise editing of lines with `nvim_buf_set_text()`.

-- Preserves both regular and extended marks.

-- But:

-- - Options 2 and 3 are **significantly** slower for a large-ish regions.

-- Toggle of ~4000 lines takes 20 ms for 1, 200 ms for 2, 400 ms for 3.

-- - Preserving extmarks is not a universally good thing to do. It looks like

-- a good idea for extmarks which are not used for directly highlighting

-- text (like for 'mini.diff' signs or smartly tracking buffer position).

-- However, preserving extmarks is not 100% desirable when they highlight

-- text area, as every comment toggle at least results in a flickering

-- due to those extmarks still highlighting a (un)commented region.

-- Main example is LSP semantic token highlighting. Although it can have

-- special treatment (precisely clear those extmarks in the target region),

-- it is not 100% effective (they are restored after undo, again resulting

-- into flicker) and there might be more unnoticed issues.

-- So all in all, computing and replacing whole lines with `lockmarks` is the

-- best compromise so far. It also aligns with treating "toggle comment" in

-- a semantic way (those lines lines now have completely different meaning)

-- rather than in a text edit way (add comment parts to those lines).

_G._from, _G._to, _G._lines = line_start - 1, line_end, vim.tbl_map(f, lines)

vim.cmd('lockmarks lua pcall(vim.api.nvim_buf_set_lines, 0, _G._from, _G._to, false, _G._lines)')

_G._from, _G._to, _G._lines = nil, nil, nil

hook_arg.action = is_comment and 'uncomment' or 'comment'

if config.hooks.post(hook_arg) == false then return end

end

--- Select comment textobject

---

--- This selects all commented lines adjacent to cursor line (if it itself is

--- commented). Designed to be used with operator mode mappings (see |mapmode-o|).

MiniComment.textobject = function()

if H.is_disabled() then return end

local config = H.get_config()

local hook_args = { action = 'textobject' }

if config.hooks.pre(hook_args) == false then return end

local lnum_cur = vim.fn.line('.')

local parts = H.get_comment_parts({ lnum_cur, vim.fn.col('.') }, config.options)

local comment_check = H.make_comment_check(parts, config.options)

local lnum_from, lnum_to

if comment_check(vim.fn.getline(lnum_cur)) then

lnum_from = lnum_cur

while (lnum_from >= 2) and comment_check(vim.fn.getline(lnum_from - 1)) do

lnum_from = lnum_from - 1

end

lnum_to = lnum_cur

local n_lines = vim.api.nvim_buf_line_count(0)

while (lnum_to <= n_lines - 1) and comment_check(vim.fn.getline(lnum_to + 1)) do

lnum_to = lnum_to + 1

end

local is_visual = vim.tbl_contains({ 'v', 'V', '\22' }, vim.fn.mode())

if is_visual then vim.cmd('normal! \27') end

-- This visual selection doesn't seem to change `'<` and `'>` marks when

-- executed as `onoremap` mapping

vim.cmd('normal! ' .. lnum_from .. 'GV' .. lnum_to .. 'G')

end

hook_args.line_start, hook_args.line_end = lnum_from, lnum_to

if config.hooks.post(hook_args) == false then return end

end

--- Get 'commentstring'

---

--- This function represents default approach of computing relevant

--- 'commentstring' option in current buffer. Used to infer comment structure.

---

--- It has the following logic:

--- - (Only on Neovim>=0.9) If there is an active tree-sitter parser, try to get

--- 'commentstring' from the local language at `ref_position`.

---

--- - If first step is not successful, use buffer's 'commentstring' directly.

---

---@param ref_position table Reference position inside current buffer at which

--- to compute 'commentstring'. Same structure as `opts.ref_position`

--- in |MiniComment.toggle_lines()|.

---

---@return string Relevant value of 'commentstring'.

MiniComment.get_commentstring = function(ref_position)

local buf_cs = vim.bo.commentstring

-- Neovim<0.9 can only have buffer 'commentstring'

if vim.fn.has('nvim-0.9') == 0 then return buf_cs end

-- TODO: Remove `opts.error` after compatibility with Neovim=0.11 is dropped

local has_parser, parser = pcall(vim.treesitter.get_parser, 0, nil, { error = false })

if not has_parser or parser == nil then return buf_cs end

-- Try to get 'commentstring' associated with local tree-sitter language.

-- This is useful for injected languages (like markdown with code blocks).

-- Sources:

-- - https://github.com/neovim/neovim/pull/22634#issue-1620078948

-- - https://github.com/neovim/neovim/pull/22643

local row, col = ref_position[1] - 1, ref_position[2] - 1

local ref_range = { row, col, row, col + 1 }

-- - Get 'commentstring' from the deepest LanguageTree which both contains

-- reference range and has valid 'commentstring' (meaning it has at least

-- one associated 'filetype' with valid 'commentstring').

-- In simple cases using `parser:language_for_range()` would be enough, but

-- it fails for languages without valid 'commentstring' (like 'comment').

local ts_cs, res_level = nil, 0

local traverse

traverse = function(lang_tree, level)

if not lang_tree:contains(ref_range) then return end

local lang = lang_tree:lang()

local filetypes = vim.treesitter.language.get_filetypes(lang)

for _, ft in ipairs(filetypes) do

-- Using `vim.filetype.get_option()` for performance as it has caching

local cur_cs = vim.filetype.get_option(ft, 'commentstring')

if type(cur_cs) == 'string' and cur_cs ~= '' and level > res_level then ts_cs = cur_cs end

end

for _, child_lang_tree in pairs(lang_tree:children()) do

traverse(child_lang_tree, level + 1)

end

traverse(parser, 1)

return ts_cs or buf_cs

end

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

-- Module default config

H.default_config = vim.deepcopy(MiniComment.config)

-- 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', vim.deepcopy(H.default_config), config or {})

-- Validate per nesting level to produce correct error message

vim.validate({

options = { config.options, 'table' },

mappings = { config.mappings, 'table' },

hooks = { config.hooks, 'table' },

})

vim.validate({

['options.custom_commentstring'] = { config.options.custom_commentstring, 'function', true },

['options.ignore_blank_line'] = { config.options.ignore_blank_line, 'boolean' },

['options.start_of_line'] = { config.options.start_of_line, 'boolean' },

['options.pad_comment_parts'] = { config.options.pad_comment_parts, 'boolean' },

['mappings.comment'] = { config.mappings.comment, 'string' },

['mappings.comment_line'] = { config.mappings.comment_line, 'string' },

['mappings.comment_visual'] = { config.mappings.comment_visual, 'string' },

['mappings.textobject'] = { config.mappings.textobject, 'string' },

['hooks.pre'] = { config.hooks.pre, 'function' },

['hooks.post'] = { config.hooks.post, 'function' },

})

return config

end

H.apply_config = function(config)

MiniComment.config = config

-- Make mappings

local operator_rhs = function() return MiniComment.operator() end

H.map('n', config.mappings.comment, operator_rhs, { expr = true, desc = 'Comment' })

H.map('x', config.mappings.comment_visual, operator_rhs, { expr = true, desc = 'Comment selection' })

H.map(

'n',

config.mappings.comment_line,

function() return MiniComment.operator() .. '_' end,

{ expr = true, desc = 'Comment line' }

)

-- Use `<Cmd>...<CR>` to have proper dot-repeat

-- See https://github.com/neovim/neovim/issues/23406

local modes = config.mappings.textobject == config.mappings.comment_visual and { 'o' } or { 'x', 'o' }

H.map(modes, config.mappings.textobject, '<Cmd>lua MiniComment.textobject()<CR>', { desc = 'Comment textobject' })

end

H.is_disabled = function() return vim.g.minicomment_disable == true or vim.b.minicomment_disable == true end

H.get_config = function(config)

return vim.tbl_deep_extend('force', MiniComment.config, vim.b.minicomment_config or {}, config or {})

end

-- Core implementations -------------------------------------------------------

H.get_comment_parts = function(ref_position, options)

local cs

if vim.is_callable(options.custom_commentstring) then cs = options.custom_commentstring(ref_position) end

cs = cs or MiniComment.get_commentstring(ref_position)

if cs == nil or cs == '' then

vim.api.nvim_echo({ { '(mini.comment) ', 'WarningMsg' }, { [[Option 'commentstring' is empty.]] } }, true, {})

return { left = '', right = '' }

end

if not (type(cs) == 'string' and string.find(cs, '%%s') ~= nil) then

H.error(vim.inspect(cs) .. " is not a valid 'commentstring'.")

end

-- Structure of 'commentstring': <left part> <%s> <right part>

local left, right = string.match(cs, '^(.-)%%s(.-)$')

-- Force single space padding if requested

if options.pad_comment_parts then

left, right = vim.trim(left), vim.trim(right)

left, right = left == '' and '' or (left .. ' '), right == '' and '' or (' ' .. right)

end

return { left = left, right = right }

end

H.make_comment_check = function(parts, options)

local l_esc, r_esc = vim.pesc(parts.left), vim.pesc(parts.right)

local prefix = options.start_of_line and '' or '%s-'

-- Commented line has the following structure:

-- <whitespace> <trimmed left> <anything> <trimmed right> <whitespace>

local regex = '^' .. prefix .. vim.trim(l_esc) .. '.*' .. vim.trim(r_esc) .. '%s-$'

return function(line) return string.find(line, regex) ~= nil end

end

H.get_lines_info = function(lines, parts, options)

local comment_check = H.make_comment_check(parts, options)

local is_commented = true

local indent, indent_width = nil, math.huge

for _, l in ipairs(lines) do

-- Update lines indent: minimum of all indents except blank lines

local _, indent_width_cur, indent_cur = string.find(l, '^(%s*)')

-- Ignore blank lines completely when making a decision

if indent_width_cur < l:len() then

-- NOTE: Copying actual indent instead of recreating it with `indent_width`

-- allows to handle both tabs and spaces

if indent_width_cur < indent_width then

indent_width, indent = indent_width_cur, indent_cur

end

-- Update comment info: commented if every non-blank line is commented

if is_commented then is_commented = comment_check(l) end

end

-- `indent` can still be `nil` in case all `lines` are empty

return indent or '', is_commented

end

H.make_comment_function = function(parts, indent, options)

local prefix = options.start_of_line and (parts.left .. indent) or (indent .. parts.left)

local nonindent_start = string.len(indent) + 1

local suffix = parts.right

local blank_comment = indent .. vim.trim(parts.left) .. vim.trim(parts.right)

local ignore_blank_line = options.ignore_blank_line

return function(line)

if H.is_blank(line) then return ignore_blank_line and line or blank_comment end

return prefix .. string.sub(line, nonindent_start) .. suffix

end

H.make_uncomment_function = function(parts)

local l_esc, r_esc = vim.pesc(parts.left), vim.pesc(parts.right)

local regex = '^(%s*)' .. l_esc .. '(.*)' .. r_esc .. '(%s-)$'

local regex_trimmed = '^(%s*)' .. vim.trim(l_esc) .. '(.*)' .. vim.trim(r_esc) .. '(%s-)$'

return function(line)

-- Try regex with exact comment parts first, fall back to trimmed parts

local indent, new_line, trail = line:match(regex)

if new_line == nil then

indent, new_line, trail = line:match(regex_trimmed)

end

-- Return original if line is not commented

if new_line == nil then return line end

-- Prevent trailing whitespace

if H.is_blank(new_line) then

indent, trail = '', ''

end

return indent .. new_line .. trail

end

-- Utilities ------------------------------------------------------------------

H.error = function(msg) error('(mini.comment) ' .. msg, 0) end

H.map = function(mode, lhs, rhs, opts)

if lhs == '' then return end

opts = vim.tbl_deep_extend('force', { silent = true }, opts or {})

vim.keymap.set(mode, lhs, rhs, opts)

end

H.is_blank = function(x) return string.find(x, '^%s*$') ~= nil end

return MiniComment

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