Nix Inline Code Highlighting

Highlights embedded languages inside Nix strings using a comment marker — analogous to @injection.language from nvim-treesitter, but for VSCode

Works alongside jnoortheen.nix-ide

Example

{
  startScript = /* bash */ ''
    echo "hello"
    for f in *.txt; do
      cat "$f"
    done
  '';

  config = /* json */ ''
    { "port": 8080, "debug": true }
  '';

  query = /* sql */ "SELECT * FROM users WHERE id = $1";
}

The /* lang */ marker goes immediately before the opening '' or ". Highlighting applies to both multi-line (''...'') and single-line ("...") Nix strings

Supported languages

bash/sh/shell/shellscript, python/py, javascript/js, typescript/ts, json, yaml/yml, toml, html, css, scss/sass, lua, ruby/rb, go/golang, rust/rs, cpp/c++/cxx, c, java, kotlin/kt, sql/postgresql/mysql, xml, markdown/md, dockerfile, nix, haskell/hs, php, perl/pl, powershell/ps1/pwsh, fish, zsh, regex/regexp, diff/patch, makefile/make, ini/conf/cfg, kdl

For highlighting to work, the corresponding language must be known to VSCode — usually either built-in or installed via a third-party extension (e.g. kdl-org.kdl for KDL)

Installation

• Marketplace: ext install barsikus007.nix-injection
• Open VSX (VSCodium / Cursor / Code-OSS): search for nix-injection in Extensions
• From .vsix: download the release from GitHub and code --install-extension nix-injection-<version>.vsix

Development

bun install
bun run generate  # regenerate syntaxes/nix-inline-injection.tmLanguage.json from scripts/generate.js
bun run test      # tokenize test.nix via vscode-textmate

To add a new language — one entry in languages.json (single source of truth for the generator and the nix flake), then bun run generate. Issues or PRs are welcomed!