A WebExtension compatible with Chrome and Firefox to display syntax-diagrams for Rust's macro_rules!() on docs.rs and doc.rust-lang.org.

A pre-built version for Chrome is published here, for Firefox here

The extension uses macro_railroad to generate diagrams. The diagrams are shown beneath each macro-block. Use the icons in the lower right corner to control options and expand the diagram to fullscreen.

To modify and build the extension locally:

• Install the cargo-web binary from crates.io
• Use ext/Makefile to re-build the Rust-parts. The javascript-shim built by cargo-web currently needs a little patching which the Makefile takes care of.
• Go to "about:debugging" (Firefox) or "chrome://extensions" (Chrome) and use "Load temporary Add-on"/"Load local extension" with manifest.json to load the extension.
• Having made changes, re-execute make to rebuild the Rust-parts, reload the extension.