gistfile1.go

package main

import (
	"fmt"
	"go/ast"
	"go/parser"
	"go/token"
	"os"
)

type TestStruct struct {
	s string
}

func main() {
	if len(os.Args) < 2 {
		fmt.Println("Must supply a file name to process.")
		return
	}
	fset := token.NewFileSet()

	f, err := parser.ParseFile(
		fset,
		os.Args[1],
		nil,
		0,
	)
	if err != nil {
		fmt.Println(err)
		return
	}

	for _, v := range f.Scope.Objects {
		if v.Kind == ast.Typ {
			spec := v.Decl.(*ast.TypeSpec)
			printStruct(spec)
			fmt.Println()
		}
	}
}

func printStruct(spec *ast.TypeSpec) {
	fmt.Println(spec.Name)
	if struc, ok := spec.Type.(*ast.StructType); ok {
		for _, field := range struc.Fields.List {
			fmt.Println(field.Names, field.Type)
			if _, ok := field.Type.(*ast.StructType); ok {
				// get ast.Decl for this struct and recursively call printStruct
			}
		}
	} else {
		fmt.Println("not a struct")
	}
}