yeager

# Yeager

Simple router implementation w/http handler for [Crystal][crystal], named after
"Router Man" - [William Yeager](https://en.wikipedia.org/wiki/William_Yeager).
It supports basic router requirements with speed.

While the `Yeager::Router` provides a basic router functionality, `Yeager::App`
aims to provide similar interface with [Express.js 4.x][express] on top of
`Yeager::Router` and built-in [`HTTP`][crystal-http] module.

[express]: https://expressjs.com
[crystal]: https://crystal-lang.org
[crystal-http]: https://crystal-lang.org/api/HTTP.html

[![Build Status](https://img.shields.io/travis/gokmen/yeager/master.svg)](https://travis-ci.org/gokmen/yeager)
[![Release Status](https://img.shields.io/github/release/gokmen/yeager.svg)](https://github.com/gokmen/yeager/releases)

## Installation

Add this to your application's `shard.yml`:

```yaml
dependencies:
  yeager:
    github: gokmen/yeager
```

## Usage

### Router only

```crystal
require "yeager"

# Create router instance
router = Yeager::Router.new

# Define your routes
router.add "/foo"
router.add "/foo/:hello"

# Run a route on router which will return nil or an
# Hash(Symbol | String => String) if there is a match
router.run "/foo"       # -> {:path => "/foo"}
router.run "/foo/world" # -> {"hello" => "world", :path => "/foo/:hello"}
router.run "/bar"       # -> nil

```

### Web application with `Yeager::App`

```crystal
require "yeager"

# Create the app
app = Yeager::App.new

# Add a glob handler to call before everything else
# will print "A new visit!" for each request
app.get "*" do |req, res, continue|
  puts "A new visit!"
  continue.call
end

# Add GET handler for "/" to response back with "Hello world!"
app.get "/" do |req, res|
  res.send "Hello world!"
end

# Redirect GET requests to "/google" to https://google.com
app.get "/google" do |req, res|
  res.redirect "https://google.com"
end

# Response with JSON on GET requests to "/json"
app.get "/json" do |req, res|
  res.status(200).json({"Hello" => "world!"})
end

# Add another GET handler for "/:user"
# which will render "Hello yeager!" for "/yeager" route
app.get "/:user" do |req, res|
  res.send "Hello #{req.params["user"]}!"
end

# Enable CORS
app.use do |req, res, continue|
  res.headers.add "Access-Control-Allow-Origin", "*"
  continue.call
end

# Start the app on port 3000
app.listen 3000 do
  print "Example app listening on 0.0.0.0:3000!"
end
```

You can checkout [specs](https://github.com/gokmen/yeager/blob/master/spec)
for advanced examples and documentation can be accessed
from [here](https://yeager.now.sh).

## Contributing

 1. Fork it (https://github.com/gokmen/yeager/fork)
 2. Create your feature branch (`git checkout -b my-new-feature`)
 3. Commit your changes (`git commit -am 'Add some feature'`)
 4. Push to the branch (`git push origin my-new-feature`)
 5. Create a new Pull Request

## Contributors

- [Gokmen Goksel](https://github.com/gokmen) - creator, maintainer