constructor

constructor is generated Constructor for struct.

Example result.

type Foo struct {
  Bar string
}

func NewFoo(bar string) Foo {
  return Foo{
    Bar: bar,
  }
}

Install

Getting constructor via go get.

$ go get -u github.com/bannzai/constructor

Usage

First, You can prepare configuration files when exec constructor setup. After created constructor.tpl. constructor necessary these configuration files.

$ constructor setup

Next, Execute constructor generate, after you edited configuration files.
And you confirm diff between before and after executing it. You found about constructor functions .go file.

$ constructor generate --source=structure/code.go --destination=structure/code.constructor.go --package=structure

$ cat structure/code.constructor.go

// DO NOT EDIT THIS FILE.
// File generated by constructor.
// https://github.com/bannzai/constructor
package structure

// NewCodeStructure insitanciate Code
func NewCodeStructure(
	filePath Path,
	structs []Struct,
) Code {
	return Code{
		FilePath: filePath,
		Structs:  structs,
	}
}

// NewFieldStructure insitanciate Field
func NewFieldStructure(
	name string,
	_type string,
) Field {
	return Field{
		Name: name,
		Type: _type,
	}
}

// NewStructStructure insitanciate Struct
func NewStructStructure(
	fields []Field,
	name string,
) Struct {
	return Struct{
		Fields: fields,
		Name:   name,
	}
}

Help

constructor --help

$ constructor --help                     

This application is a tool to generate constructor functions for each struct quickly.
When you execute "constructor generate [flags]",
It is generating constructor functions under the package.
You get "./constructor.tpl" via to execute "constructor setup".
This is default template for [constructor].
You can edit this template, If you customize generated files and pass it.

Usage:
  construtor [flags]
  construtor [command]

Available Commands:
  generate    generate constructor functions
  help        Help about any command
  setup       setup will create ./constructor.yaml

Flags:
  -h, --help   help for construtor

Use "construtor [command] --help" for more information about a command.

constructor generate --help

$ constructor generate --help            
constructor can be add constructor functions for each go struct.

Usage:
  construtor generate [flags]

Flags:
      --destination string    Destination go file path
  -h, --help                  help for generate
      --ignoreFields string   Not contains generated fields. It is list with commas. (e.g id,name,age
      --package string        Package name for generated constructor.
      --source string         Source go file path
      --template string       Constructor functions format template file path. Default is ./constructor.tpl (default "constructor.tpl")
      --type string           Specify struct about generated constructor function.

go:generate

constructor recommended to use go:generate. For example.

//go:generate constructor generate --source=$GOFILE --destination=$GOPATH/src/github.com/bannzai/constructor/generator/constructor.constructor.go --package=$GOPACKAGE --template=$GOPATH/src/github.com/bannzai/constructor/constructor.tpl --type=Constructor --ignoreFields=TemplateReader,SourceCodeReader

Customize template

It is possible to use customize template.
Two ways for preparing template files.

Edit constructor.tpl
Create new [YOUR_CUSTOMIZE_TEMPLATE].tpl

And, It can be passed to constructor generate [REQUIRED_FLAGS] --template=[YOUR_CUSTOMIZE_TEMPLATE].tpl.

LICENSE

constructor is available under the MIT license. See the LICENSE file for more info.

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bannzai / constructor

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