General Golang Code Generator


Build Status Go dev License matrix


gg is a General Golang Code Generator: A Good Game to play with Golang.

package main

import (

	. ""

func main() {
	f := NewGroup()
		String(`fmt.Println("%s")`, "Hello, World!"),

Output (after go fmt)

package main

import "fmt"

func main() {
	fmt.Println("Hello, World!")


gg is a general golang code generator that designed for resolving problems exists in the following tools:

  • text/template: Additional syntax, Steep learning curve, Complex logic is difficult to maintain
  • dave/jennifer: Overly abstract APIs, user need to take care about (), , everywhere.
  • kubernetes-sigs/kubebuilder: Parse data from struct tags/comments, not a general code generator.

In short, gg will provide near-native golang syntax and helpful API so play a good game with Golang. With gg, we can generate golang code more easily and understandable.


Package Name

f := Group()
// package main


f := Group()
	AddAlias("x", "testing")
// import (
//      "context"
//      . "math"
//      _ "time"
//      x "testing"
// )


f := Group()
    WithReceiver("v", "*World").
    AddParameter("content", "string").
    AddParameter("times", "int").
    AddResult("v", "string").
    AddBody(gg.String(`return fmt.Sprintf("say %s in %d times", content, times)`))
// func (v *World) hello(content string, times int) (v string) {
//  return fmt.Sprintf("say %s in %d times", content, times)


f := Group()
    AddField("x", "int64").
    AddField("y", "string")
// type World struct {
//    x int64
//    y string


  • gg is inspired by dave/jennifer, I borrowed most ideas and some code from it. Nice work!
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  • v0.3.0(Nov 4, 2021)

  • v0.2.0(Sep 15, 2021)

    v0.2.0 - 2021-09-15


    • feat: Add group.AddString support
    • feat: Implement type and type alias support


    • function without AddBody will not generate empty body anymore.
    Source code(tar.gz)
    Source code(zip)
  • v0.1.0(Sep 8, 2021)

    v0.1.0 - 2021-09-08


    • feat: Add interface support (#4)
    • feat: Implement AppendFile
    • feat: Field accept both string and Node as input
    • feat: Add typed field support
    • feat: Export logic statement for group
    • feat: Add function call support
    • feat: Allow all body accept interface instead
    • feat: Add defer and function call support
    • Add var decl support
    • feat: Add test case for struct
    • API Redesign


    • fix: Struct should not have NamedLineComment
    • fix: struct Field should not return nil
    • fix: Insert a new line before closing struct
    • fix: Insert new line after switch case


    • Change return to accept input instead of function call
    • refactor: Make comment as float just like go ast (#6)
    Source code(tar.gz)
    Source code(zip)
  • v0.0.2(Sep 3, 2021)

  • v0.0.1(Sep 3, 2021)

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