View treesitter information directly in Neovim!

• Neovim nightly
• nvim-treesitter plugin

Install the plugin (vim-plug shown):

Plug 'nvim-treesitter/nvim-treesitter'
Plug 'nvim-treesitter/playground'

It's also recommended that you install the query parser for query editor highlighting. Run this after installing the above plugins.

:TSInstall query

The configuration is like any other nvim-treesitter module.

require "nvim-treesitter.configs".setup {
  playground = {
    enable = true,
    disable = {},
    updatetime = 25, -- Debounced time for highlighting nodes in the playground from source code
    persist_queries = false, -- Whether the query persists across vim sessions
    keybindings = {
      toggle_query_editor = 'o',
      toggle_hl_groups = 'i',
      toggle_injected_languages = 't',
      toggle_anonymous_nodes = 'a',
      toggle_language_display = 'I',
      focus_language = 'f',
      unfocus_language = 'F',
      update = 'R',
      goto_node = '<cr>',
      show_help = '?',
    },
  }
}

The tree can be toggled using the command :TSPlaygroundToggle.

• R: Refreshes the playground view when focused or reloads the query when the query editor is focused.
• o: Toggles the query editor when the playground is focused.
• a: Toggles visibility of anonymous nodes.
• i: Toggles visibility of highlight groups.
• I: Toggles visibility of the language the node belongs to.
• t: Toggles visibility of injected languages.
• f: Focuses the language tree under the cursor in the playground. The query editor will now be using the focused language.
• F: Unfocuses the currently focused language.
• <cr>: Go to current node in code buffer

Press o to show the query editor. Write your query like (node) @capture, put the cursor under the capture to highlight the matches.

When you are on a query buffer, you can get a list of suggestions with Ctrl-X Ctrl-O. See :h 'omnifunc'.

The playground can lint query files for you. For that, you need to activate the query_linter module:

require "nvim-treesitter.configs".setup {
  query_linter = {
    enable = true,
    use_virtual_text = true,
    lint_events = {"BufWrite", "CursorHold"},
  },
}

The playground comes with :TSHighlightCapturesUnderCursor that shows any treesitter or syntax highlight groups under the cursor.