GGG

Go generator for struct converters.

package main

import (
	"strconv"
)

// From is a type you want convert from.
type From struct {
	A string
	B *string
	C string
	D *string
	E int
	F string
	G int
	H []string
}

// To is a type you want convert to.
type To struct {
	A string
	B *string
	C *string
	D string
	E int
	F int
	G string
	H []string
}

// Write a function, that would be converter.
// Its signature should contain 1 named parameter and 1 result.
// Above function write magic comment //ggg:convert

//ggg:convert
func convertFromToTo(in From) To{}

// Run `ggg -w path/to/file`
//
// Converter would appear and magic comment would be deleted.

func convertFromToTo2(in To) From {
	return From{
		A: in.A,
		B: in.B,
		C: *in.C,
		D: &in.D,
		E: in.E,
		F: strconv.Itoa(in.F),
		G: newStringFromInt(in.G), // for unknown converters it generates another convert call.
		H: in.H,
	}
}

Install

go get -u github.com/vetcher/ggg

How to use it?

In Goland Preferences->Tools->External Tools. Add new tool ggg with Arguments: -w $FilePath$. If you want, add keyboard shortcut for new tool.

Another approach is to add ggg as File Watcher and use it like goimports. But ggg is slow for use it automatically on save, so my recommendation is to run ggg manually via External Tools and from CLI / makefile.

Also, in Preferences->Editor->Live Templates you may add autocomplete, that would write magic comment for you. Click Add add fill fields like in screenshot below.

After that, when writing ggg above function, autocomplete would appear.