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Nvim-plugin for doing the opposite of join-line (J) of arguments, powered by treesitter. The intention of the plugin is the same as revJ. However trevJ uses treesitter to figure out the formatting and in general does everything much more efficient and better, while not polluting registers, last visual selection etc. My intention is that anyone using revJ should have a smooth transfer to trevJ but both configuration and usage will necessarily be somewhat different and instead of making a breaking change for revJ I decided to make a new plugin. Also since it's anyway a complete re-write of the code.


For example using packer:

use {
  config = 'require("trevj").setup()',  -- optional call for configurating non-default filetypes etc

  -- uncomment if you want to lazy load
  -- module = 'trevj',

  -- an example for configuring a keybind, can also be done by filetype
  -- setup = function()
  --   vim.keymap.set('n', '<leader>j', function()
  --     require('trevj').format_at_cursor()
  --   end)
  -- end,


When configuring a language you should specify the treesitter node types that contains the child nodes which should be put on separate lines. For example for the default configuration for lua looks as follows:

  containers = {
    lua = {
      table_constructor = {final_separator = ',', final_end_line = true},
      arguments = {final_separator = false, final_end_line = true},
      parameters = {final_separator = false, final_end_line = true},,
    ... -- other filetypes


  • final_separator: if truthy adds this character after the final child node if not existing.
  • final_end_line: if there should be a final line before the and character of the container node.
  • skip (optional): a table where keys correspond to children types to not put on newlines and values are truthy. For example, the default config for html is:
    html = {
      start_tag = {
        final_separator = false,
        final_end_line = true,
        skip = {tag_name = true},
    in order to not put the tag_name on a new line. This can also be a callable which takes a table of with the fields node and name and should return bool. See example for usage for import_from_statement in python.
  • make_seperator (optional): a callable taking a table of with the fields node and name and should return a string to be used as a separator before the node (defaults to ''). Note this is only used when a newline is not used (for example if the node is skipped or not named). See example for usage for import_from_statement in python.

For existing languages you can override anything and defaults will be used for anything unspecified.

Supported Languages

Currently the following languages are supported by default:

  • c
  • cpp
  • dart
  • go
  • html
  • javascript
  • javascriptreact
  • lua
  • php
  • python
  • ruby
  • rust
  • supercollider
  • typescript
  • typescriptreact

You can add your own, of even better submit a PR for your favorite language.



{final_separator = ',', final_end_line = true}


  final_separator = ',',
  final_end_line = true,

no final separator

{final_separator = false, final_end_line = true}


  final_separator = false,
  final_end_line = true

no final separator, no final line

{final_separator = false, final_end_line = false}


  final_separator = false,
  final_end_line = false}


Call require('trevj').format_at_cursor() or bind a key to it. Note that you need to be inside the container treesitter node, otherwise a warning will be given.