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// Comment.nvim

Smart and Powerful commenting plugin for neovim

Comment.nvim

Features

  • Supports treesitter. Read more
  • Supports commentstring. Read :h comment.commentstring
  • Supports line (//) and block (/* */) comments
  • Dot (.) repeat support for gcc, gbc and friends
  • Count support for [count]gcc and [count]gbc
  • Left-right (gcw gc$) and Up-Down (gc2j gc4k) motions
  • Use with text-objects (gci{ gbat)
  • Supports pre and post hooks
  • Ignore certain lines, powered by Lua regex

🚀 Installation

use {
    'numToStr/Comment.nvim',
    config = function()
        require('Comment').setup()
    end
}
Plug 'numToStr/Comment.nvim'

" Somewhere after plug#end()
lua require('Comment').setup()

📖 Getting Help

Comment.nvim provides help docs which can be accessed by running :help comment-nvim

⚒️ Setup

First you need to call the setup() method to create the default mappings.

Note - If you are facing Keybindings are mapped but they are not working issue then please try this

  • Lua
require('Comment').setup()
  • VimL
lua << EOF
require('Comment').setup()
EOF

Configuration (optional)

Following are the default config for the setup(). If you want to override, just modify the option that you want then it will be merged with the default config. Read :h comment.config for more info.

{
    ---Add a space b/w comment and the line
    padding = true,
    ---Whether the cursor should stay at its position
    sticky = true,
    ---Lines to be ignored while (un)comment
    ignore = nil,
    ---LHS of toggle mappings in NORMAL mode
    toggler = {
        ---Line-comment toggle keymap
        line = 'gcc',
        ---Block-comment toggle keymap
        block = 'gbc',
    },
    ---LHS of operator-pending mappings in NORMAL and VISUAL mode
    opleader = {
        ---Line-comment keymap
        line = 'gc',
        ---Block-comment keymap
        block = 'gb',
    },
    ---LHS of extra mappings
    extra = {
        ---Add comment on the line above
        above = 'gcO',
        ---Add comment on the line below
        below = 'gco',
        ---Add comment at the end of line
        eol = 'gcA',
    },
    ---Enable keybindings
    ---NOTE: If given `false` then the plugin won't create any mappings
    mappings = {
        ---Operator-pending mapping; `gcc` `gbc` `gc[count]{motion}` `gb[count]{motion}`
        basic = true,
        ---Extra mapping; `gco`, `gcO`, `gcA`
        extra = true,
    },
    ---Function to call before (un)comment
    pre_hook = nil,
    ---Function to call after (un)comment
    post_hook = nil,
}

🔥 Usage

When you call setup() method, Comment.nvim sets up some basic mapping which can used in NORMAL and VISUAL mode to get you started with the pleasure of commenting stuff out.

Basic mappings

These mappings are enabled by default. (config: mappings.basic)

  • NORMAL mode
`gcc` - Toggles the current line using linewise comment
`gbc` - Toggles the current line using blockwise comment
`[count]gcc` - Toggles the number of line given as a prefix-count using linewise
`[count]gbc` - Toggles the number of line given as a prefix-count using blockwise
`gc[count]{motion}` - (Op-pending) Toggles the region using linewise comment
`gb[count]{motion}` - (Op-pending) Toggles the region using blockwise comment
  • VISUAL mode
`gc` - Toggles the region using linewise comment
`gb` - Toggles the region using blockwise comment

Extra mappings

These mappings are enabled by default. (config: mappings.extra)

  • NORMAL mode
`gco` - Insert comment to the next line and enters INSERT mode
`gcO` - Insert comment to the previous line and enters INSERT mode
`gcA` - Insert comment to end of the current line and enters INSERT mode
Examples
# Linewise

`gcw` - Toggle from the current cursor position to the next word
`gc$` - Toggle from the current cursor position to the end of line
`gc}` - Toggle until the next blank line
`gc5j` - Toggle 5 lines after the current cursor position
`gc8k` - Toggle 8 lines before the current cursor position
`gcip` - Toggle inside of paragraph
`gca}` - Toggle around curly brackets

# Blockwise

`gb2}` - Toggle until the 2 next blank line
`gbaf` - Toggle comment around a function (w/ LSP/treesitter support)
`gbac` - Toggle comment around a class (w/ LSP/treesitter support)

🌳 Treesitter

This plugin has native treesitter support for calculating commentstring which works for multiple (injected/embedded) languages like Vue or Markdown. But due to the nature of the parsed tree, this implementation has some known limitations.

  1. No jsx/tsx support. Its implementation was quite complicated.
  2. Invalid comment on the region where one language ends and the other starts. Read more
  3. Unexpected comment on a line with multiple languages. #144

For advance use cases, use nvim-ts-context-commentstring. See pre_hook section for the integration.

Note - This plugin does not depend on nvim-treesitter however it is recommended in order to easily install tree-sitter parsers.

🎣 Hooks

There are two hook methods i.e pre_hook and post_hook which are called before comment and after comment respectively. Both should be provided during setup().

  • pre_hook - Called with a ctx argument (Read :h comment.utils.CommentCtx) before (un)comment. Can optionally return a commentstring to be used for (un)commenting.
{
    pre_hook = function(ctx)
        if ctx.range.srow == ctx.range.erow then
            -- do something with the current line
        else
            -- do something with lines range
        end
    end,
}

You can also integrate nvim-ts-context-commentstring using pre_hook to easily comment tsx/jsx files.

Note - Comment.nvim already supports treesitter out-of-the-box for all the languages except tsx/jsx.

{
    pre_hook = require('ts_context_commentstring.integrations.comment_nvim').create_pre_hook(),
}

  • post_hook - This method is called after (un)commenting. It receives the same ctx (Read :h comment.utils.CommentCtx) argument as pre_hook.
{
    post_hook = function(ctx)
        if ctx.range.srow == ctx.range.erow then
            -- do something with the current line
        else
            -- do something with lines range
        end
    end,
}

The post_hook can be implemented to cover some niche use cases like the following:

  • Using newlines instead of padding e.g. for commenting out code in C with #if 0. See an example here.
  • Duplicating the commented block (using pre_hook) and moving the cursor to the next block (using post_hook). See this.

NOTE: When pressing gc, gb and friends, cmode (Comment mode) inside pre_hook will always be toggle because when pre-hook is called, in that moment we don't know whether gc or gb will comment or uncomment the lines. But luckily, we do know this before post_hook and this will always receive either comment or uncomment status

🚫 Ignoring lines

You can use ignore to ignore certain lines during comment/uncomment. It can takes lua regex string or a function that returns a regex string and should be provided during setup().

NOTE: Ignore only works when with linewise comment. This is by design. As ignoring lines in block comments doesn't make that much sense.

  • With string
-- ignores empty lines
ignore = '^$'

-- ignores line that starts with `local` (excluding any leading whitespace)
ignore = '^(%s*)local'

-- ignores any lines similar to arrow function
ignore = '^const(.*)=(%s?)%((.*)%)(%s?)=>'
  • With function
{
    ignore = function()
        -- Only ignore empty lines for lua files
        if vim.bo.filetype == 'lua' then
            return '^$'
        end
    end,
}

🗨️ Filetypes + Languages

Most languages/filetypes have native support for comments via commentstring but there might be a filetype that is not supported. There are two ways to enable commenting for unsupported filetypes:

  1. You can set commentstring for that particular filetype like the following. Read :h commentstring for more info.
vim.bo.commentstring = '//%s'

-- or
vim.api.nvim_command('set commentstring=//%s')

  1. You can also use this plugin interface to store both line and block commentstring for the filetype. You can treat this as a more powerful version of the commentstring. Read :h comment.ft for more info.
local ft = require('Comment.ft')

-- 1. Using set function

ft
 -- Set only line comment
 .set('yaml', '#%s')
 -- Or set both line and block commentstring
 .set('javascript', {'//%s', '/*%s*/'})

-- 2. Metatable magic

ft.javascript = {'//%s', '/*%s*/'}
ft.yaml = '#%s'

-- Multiple filetypes
ft({'go', 'rust'}, ft.get('c'))
ft({'toml', 'graphql'}, '#%s')

PR(s) are welcome to add more commentstring inside the plugin

🤝 Contributing

There are multiple ways to contribute reporting/fixing bugs, feature requests. You can also submit commentstring to this plugin by updating ft.lua and sending PR.

📺 Videos

💐 Credits

  • tcomment - To be with me forever and motivated me to write this.
  • nvim-comment - Little and less powerful cousin. Also I took some code from it.
  • kommentary - Nicely done plugin but lacks some features. But it helped me to design this plugin.

🚗 Roadmap

  • Doc comment i.e /**%s*/ (js), ///%s (rust)
  • Header comment
----------------------
-- This is a header --
----------------------