go-render

A simple and flexible solution to render a value to a io.Writer using different formats based on a format string argument.

Designed around using a custom type/struct to render your output. Thanks to Go's marshaling interfaces, you get JSON, YAML, and XML support almost for free. While plain text output is supported by the type implementing io.Reader, io.WriterTo, fmt.Stringer, and error interfaces, or by simply being a type which can easily be type cast to a byte slice.

Originally intended to easily implement CLI tools which can output their data as plain text, as well as JSON/YAML with a simple switch of a format string. But it can just as easily render to any io.Writer.

The package is designed to be flexible and extensible with a sensible set of defaults accessible via package level functions. You can create your own Renderer for custom formats, or create new handlers that support custom formats.

Import

import "github.com/jimeh/go-render"

Usage

Basic usage to render a value to various formats into a io.Writer:

version := &Version{Version: "1.2.1", Stable: true, Latest: false}

err = render.Pretty(w, "text", version)
// 1.2.1 (stable: true, latest: false)

err = render.Pretty(w, "json", version)
// {
//   "version": "1.2.1",
//   "latest": false,
//   "stable": true
// }

err = render.Compact(w, "json", version)
// {"version":"1.2.1","latest":false,"stable":true}

err = render.Pretty(w, "yaml", version)
// version: 1.2.1
// latest: false
// stable: true

err = render.Pretty(w, "xml", version)
// <version latest="false" stable="true">1.2.1</version>

The above assumes the following Version struct:

type Version struct {
    Version string `json:"version" yaml:"version" xml:",chardata"`
    Latest  bool   `json:"latest" yaml:"latest" xml:"latest,attr"`
    Stable  bool   `json:"stable" yaml:"stable" xml:"stable,attr"`
}

func (v *Version) String() string {
    return fmt.Sprintf(
        "%s (stable: %t, latest: %t)", v.Version, v.Stable, v.Latest,
    )
}

Documentation

Please see the Go Reference for documentation and further examples.

License

MIT