Processing — ZedExt

Processing for Zed

Processing language support for Zed with completions and diagnostics driven by the Processing language server.

Features

Syntax highlighting, indentation, and bracket matching
Completions, signature help, and diagnostics directly from Processing

Requirements

Install Processing 4.4.6 or newer and launch it once so the CLI is fully initialized.
Ensure the processing executable that ships with Processing 4.x is reachable from your PATH, exposed through one of the following environment variables, or configured explicitly via Zed settings:
- PROCESSING_PATH
- PROCESSING_BIN
- PROCESSING_CLI
Zed 0.158.0 or newer (any release that can load extensions built with zed_extension_api 0.7.0).

If the executable lives outside PATH, add a workspace or global setting similar to:

// settings.json
{
  "lsp": {
    "processing-language-server": {
      "binary": {
        "path": "/Applications/Processing.app/Contents/MacOS/Processing",
        "arguments": [],
        "env": {
          "JAVA_HOME": "/Library/Java/JavaVirtualMachines/jdk-21.jdk/Contents/Home"
        }
      }
    }
  }
}

The arguments array is optional; the extension always appends the lsp subcommand.

Running sketches

Zed's public extension API does not yet expose an API for adding editor run buttons or an integrated console surface. Once Zed surfaces a general task or runnable API for extensions, this project can hook into Processing's cli --run/--export commands to provide a run button similar to the official VS Code extension.

Development

# build the WebAssembly module
cargo build --release --target wasm32-wasip2

The highlight queries in languages/processing/highlights.scm originate from the MIT-licensed tree-sitter-java project.