easy-plugin 0.2.10

easy-plugin
===========

[![crates.io](  https://img.shields.io/crates/v/easy-plugin.svg)](https://crates.io/crates/easy-plugin)
[![Travis CI](https://travis-ci.org/KyleMayes/easy-plugin.svg?branch=master)](https://travis-ci.org/KyleMayes/easy-plugin)

[Documentation](https://kylemayes.github.io/easy-plugin/easy_plugin)

A compiler plugin that makes it easier to write compiler plugins.

Released under the Apache License 2.0.

### Example

```rust
easy_plugin! {
    struct Arguments {
		// An argument specification that accepts a simple binary expression.
    	$a:ident $operator:binop $b:ident
    }

    // The `arguments: Arguments` argument contains the parsed results of the
    // plugin arguments according to the above specification. An error is reported
    // if the plugin arguments cannot be parsed.
    pub fn expand_plugin(
        context: &mut ExtCtxt, span: Span, arguments: Arguments
    ) -> PluginResult<Box<MacResult>> {
    	// Accesses the parsed results.
        println!("{:?} {:?} {:?}", arguments.a, arguments.operator, arguments.b);

        // Returns `Ok` to signal this plugin completed successfully. An error is
        // reported if `Err` is returned instead.
        Ok(DummyResult::any(span))
    }
}

#[plugin_registrar]
pub fn plugin_registrar(registry: &mut Registry) {
    registry.register_macro("plugin", expand_plugin);
}
```