# The Artist formerly known as gopkg.in/yaml.v3

FORK
------------

This is specifically a fork maintained by @braydonk particularly for
the interests of [yamlfmt](https://www.github.com/google/yamlfmt).

The focus of the fixes to this repo are specifically on the workflow of
Unmarshalling to `yaml.Node` and immediately encoding. Many of the fixes
will likely work for any workflow through the library and can potentially
be adopted, but there may be cases where it won't.
This repo also adds tests to `formattest` which are test cases focused on
this workflow.

The following is the documentation as stated upstream. I will change it
when necessary.

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 supports most of YAML 1.2, but preserves some behavior
from 1.1 for backwards compatibility.

Specifically, as of v3 of the yaml package:

 - YAML 1.1 bools (_yes/no, on/off_) are supported as long as they are being
   decoded into a typed bool value. Otherwise they behave as a string. Booleans
   in YAML 1.2 are _true/false_ only.
 - Octals encode and decode as _0777_ per YAML 1.1, rather than _0o777_
   as specified in YAML 1.2, because most parsers still use the old format.
   Octals in the  _0o777_ format are supported though, so new files work.
 - Does not support base-60 floats. These are gone from YAML 1.2, and were
   actually never supported by this package as it's clearly a poor choice.

and offers backwards
compatibility with YAML 1.1 in some cases.
1.2, including support for
anchors, tags, map merging, etc. Multi-document unmarshalling is not yet
implemented, and base-60 floats from YAML 1.1 are purposefully not
supported since they're a poor design and are gone in YAML 1.2.

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

The import path for the package is *gopkg.in/yaml.v3*.

To install it, run:

    go get gopkg.in/yaml.v3

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

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

  - [https://gopkg.in/yaml.v3](https://gopkg.in/yaml.v3)

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

The package API for yaml v3 will remain stable as described in [gopkg.in](https://gopkg.in).


License
-------

The yaml package is licensed under the MIT and Apache License 2.0 licenses.
Please see the LICENSE file for details.


Example
-------

```Go
package main

import (
        "fmt"
        "log"

        "gopkg.in/yaml.v3"
)

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

// Note: struct fields must be public in order for unmarshal to
// correctly populate the data.
type T struct {
        A string
        B struct {
                RenamedC int   `yaml:"c"`
                D        []int `yaml:",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
```

