# YAML support for the Go language

Introduction
------------

The yaml package enables Go programs to comfortably encode and decode YAML
values. It was developed within [Canonical](https://www.canonical.com) as
part of the [juju](https://juju.ubuntu.com) project, and is based on a
pure Go port of the well-known [libyaml](http://pyyaml.org/wiki/LibYAML)
C library to parse and generate YAML data quickly and reliably.

Compatibility
-------------

The yaml package is almost compatible with YAML 1.1, including support for
anchors, tags, etc. There are still a few missing bits, such as document
merging, base-60 floats (huh?), and multi-document unmarshalling. These
features are not hard to add, and will be introduced as necessary.

Installation and usage
----------------------

The import path for the package is *gopkg.in/yaml.v1*.

To install it, run:

    go get gopkg.in/yaml.v1

API documentation
-----------------

If opened in a browser, the import path itself leads to the API documentation:

  * [https://gopkg.in/yaml.v1](https://gopkg.in/yaml.v1)

API stability
-------------

The package API for yaml v1 will remain stable as described in [gopkg.in](https://gopkg.in).


License
-------

The yaml package is licensed under the LGPL with an exception that allows it to be linked statically. Please see the LICENSE file for details.


Example
-------

```Go
package main

import (
        "fmt"
        "log"

        "gopkg.in/yaml.v1"
)

var data = `
a: Easy!
b:
  c: 2
  d: [3, 4]
`

type T struct {
        A string
        B struct{C int; D []int ",flow"}
}

func main() {
        t := T{}
    
        err := yaml.Unmarshal([]byte(data), &t)
        if err != nil {
                log.Fatalf("error: %v", err)
        }
        fmt.Printf("--- t:\n%v\n\n", t)
    
        d, err := yaml.Marshal(&t)
        if err != nil {
                log.Fatalf("error: %v", err)
        }
        fmt.Printf("--- t dump:\n%s\n\n", string(d))
    
        m := make(map[interface{}]interface{})
    
        err = yaml.Unmarshal([]byte(data), &m)
        if err != nil {
                log.Fatalf("error: %v", err)
        }
        fmt.Printf("--- m:\n%v\n\n", m)
    
        d, err = yaml.Marshal(&m)
        if err != nil {
                log.Fatalf("error: %v", err)
        }
        fmt.Printf("--- m dump:\n%s\n\n", string(d))
}
```

This example will generate the following output:

```
--- t:
{Easy! {2 [3 4]}}

--- t dump:
a: Easy!
b:
  c: 2
  d: [3, 4]


--- m:
map[a:Easy! b:map[c:2 d:[3 4]]]

--- m dump:
a: Easy!
b:
  c: 2
  d:
  - 3
  - 4
```