Autumn - Syntax highlighter powered by Tree-sitter and Neovim themes.

It have even terminal formatter, amazing!

Can it detect if a call is a macro or function call? It would be amazing to style DSL and function call differently.

Hi @Eiji

I don’t think the Elixir parser does such distinction:

❯ cat example.ex
1 |> then(fn x -> x * 2 end)

❯ autumn dump-tree-sitter example.ex
source (0, 0) - (1, 0)
  binary_operator (0, 0) - (0, 28)
    integer (0, 0) - (0, 1) "1"
    |> (0, 2) - (0, 4) "|>"
    call (0, 5) - (0, 28)
      identifier (0, 5) - (0, 9) "then"
      arguments (0, 9) - (0, 28)
        ( (0, 9) - (0, 10) "("
        anonymous_function (0, 10) - (0, 27)
          fn (0, 10) - (0, 12) "fn"
          stab_clause (0, 13) - (0, 23)
            arguments (0, 13) - (0, 14)
              identifier (0, 13) - (0, 14) "x"
            -> (0, 15) - (0, 17) "->"
            body (0, 18) - (0, 23)
              binary_operator (0, 18) - (0, 23)
                identifier (0, 18) - (0, 19) "x"
                * (0, 20) - (0, 21) "*"
                integer (0, 22) - (0, 23) "2"
          end (0, 24) - (0, 27) "end"
        ) (0, 27) - (0, 28) ")"

So that then (macro call) is highlighted as function.call as defined in the query from nvim-treesitter:

❯ autumn highlight example.ex --formatter html-linked
<pre class="athl"><code class="language-elixir" translate="no" tabindex="0"><span class="line" data-line="1"><span class="number">1</span> <span class="operator">|&gt;</span> <span class="function-call">then</span><span class="punctuation-bracket">(</span><span class="keyword">fn</span> <span class="variable">x</span> <span class="operator">-&gt;</span> <span class="variable">x</span> <span class="operator">*</span> <span class="number">2</span> <span class="keyword">end</span><span class="punctuation-bracket">)</span>
</span></code></pre>

It is impossible to do with just parser, it would need to be full evaluator, especially that it requires to know about the called module.

Hey some updates for Autumn that might be worth checking out:

• Added support to include a header element wrapping the code block
• Added support to highlight specific lines using a CSS class or style (depends on the formatter)
• Added more languages and a Random button on the demo site https://autumnus.dev
• Functions to “bring your own theme” - you can edit themes and load at runtime
• Added more than 10 new themes and updated a few more
• Added new languages

Full changelog at Changelog — Autumn v0.7.0

Really smart to use tree sitter for this.

Hey Valim thanks! Indeed tree-sitter works very well with a relatively small binary and possibly even smaller thanks to feature flags

Tree-sitter is pretty much becoming a standard and even vscode is exploring using it. Leaving this issue for those interested Explore using tree sitter for syntax highlighting · Issue #210475 · microsoft/vscode · GitHub

v0.5.0 released with a focus on highlighting lines, for example to highlight some lines with custom style:

{:html_inline, highlight_lines: %{lines: [1, 3..5, 8], style: "background-color: #fff3cd; border-left: 3px solid #ffc107;"}}

Also updated languages and themes, and replace <span> with <div> for lines. Full changelog at Changelog — Autumn v0.7.0

I should say that highlighted lines have default styles inherited from the CursorLine highlight group from Neovim themes, which is actually implemented by crates.io: Rust Package Registry