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Syntax highlighting

For detailed introduction see the official guide on Syntax highlighting.

Briefly speaking, Tree-sitter uses the rules in queries/highlights.scm to annotate nodes with specific tokens, then it maps those tokens to formatting style according to user-defined theme.

To test highlighting using the CLI, you need to create local configuration.

# Create the config file
npx tree-sitter init-config

The above command should print out the config location, so that you can further configure it. Open the file and modify "parser-directories" to include the parent directory of tree-sitter-elixir. Also, you can optionally customize the theme, here's a tiny subset of the One Dark theme:

  "number": {
    "color": "#61afef",
    "bold": true
  "string": "#98c379",
  "string.escape": "#56b6c2",
  "string.special": "#61afef",
  "string.regexp": "#e06c75",
  "type": "#e06c75",
  "comment": {
    "color": "#5c6370",
    "italic": true
  "punctuation": "#abb2bf",
  "punctuation.special": "#be5046",
  "operator": {
    "color": "#d19a66",
    "bold": true
  "variable": "#abb2bf",
  "function": "#61afef",
  "constant": "#61afef",
  "constant.builtin": {
    "color": "#e06c75",
    "bold": true
  "keyword": "#c678dd",
  "attribute": "#e06c75",
  "embedded": null

With this setup you can test highlighting on files using the Tree-sitter CLI.

npx tree-sitter highlight tmp/test.ex

npx tree-sitter highlight test/highlight/**/*.ex