https://github.com/xsleonard/gopts

Self-referential struct configuration
https://github.com/xsleonard/gopts

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Self-referential struct configuration

• Host: GitHub
• URL: https://github.com/xsleonard/gopts
• Owner: xsleonard
• License: mit
• Created: 2014-01-28T18:09:57.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2014-01-28T23:31:47.000Z (over 10 years ago)
• Last Synced: 2024-06-21T03:18:51.844Z (3 months ago)
• Language: Go
• Homepage:
• Size: 160 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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gopts

=====

[![Build Status](https://drone.io/github.com/xsleonard/gopts/status.png)](https://drone.io/github.com/xsleonard/gopts/latest)

Self-referential struct configuration.

This package was inspired by http://commandcenter.blogspot.com/2014/01/self-referential-functions-and-design.html

Documentation: [![GoDoc](https://godoc.org/github.com/xsleonard/gopts?status.png)](http://godoc.org/github.com/xsleonard/gopts)

## Example

```go

import "gopts"

var (

    Port = gopts.Option("Config.Port", uint16(7777))

    Network = gopts.Option("Network", "tcp")

)

type ServerConfig struct {

    Port uint16

}

type Server struct {

    Network string

    Config ServerConfig

}

func NewServer(opts ...gopts.OptSetter) *Server {

    s := &Server{}

    // set defaults

    gopts.Set(s, Port(), Network())

    // override defaults with user's values

    gopts.Set(s, opts...)

    return s

}

func updateServer() {

    s := NewServer(Network("udp"))

    // s.Config.Port == 7777

    // s.Network == "udp"

    // Set multiple options

    prevOpts := gopts.Set(s, Port(uint16(6666)), Network("tcp"))

    // s.Config.Port == 6666

    // s.Network == "tcp"

    // Reset to the previous values. These two statements are equivalent.

    prevOpts = gopts.Set(s, prevOpts...)

    // s.Config.Port == 7777

    // s.Config.Network == "udp"

    // Shorthand for setting a single option:

    prevOpts[0](s)

    // s.Config.Port == 6666

}

```