goaccessor

中文介绍

goaccessor is a Go tool designed to automate the generation of getter and setter boilerplate code for your types and variables.

Usage

go install github.com/yujiachen-y/goaccessor@latest

After installing goaccessor, you can use it in the command line interface (CLI) or with //go:generate directives. Check out the Examples section for more information.

Examples

You can find a runnable 'book' example in the example folder.

Consider the file book.go:

package main

//go:generate goaccessor --target Book --getter --setter
type Book struct {
    Title  string
    Author string
}

When we run go generate, it creates a new file book_goaccessor.go:

// Code generated by "goaccessor --target Book --getter --setter". DO NOT EDIT.

package main

func (b *Book) GetTitle() string {
    return b.Title
}

func (b *Book) SetTitle(title string) {
    b.Title = title
}

func (b *Book) GetAuthor() string {
    return b.Author
}

func (b *Book) SetAuthor(author string) {
    b.Author = author
}

Top-level variables

goaccessor isn't just for struct types; it can also handle top-level constants and variables. For instance:

//go:generate goaccessor --target books --getter --setter
var books = map[string]*Book {
    ...
}

After executing go generate, we get:

func GetBooks() map[string]*Book {
    return books
}

func SetBooks(newBooks map[string]*Book) {
    books = newBooks
}

Complex cases

In certain cases, you might want to export specific fields of a top-level variable with a prefix:

//go:generate goaccessor --target bestSellingBook --field --getter --include Author --prefix BestSelling
var bestSellingBook = &Book{ ... }

This directive will generate:

func GetBestSellingAuthor() string {
    return bestSellingBook.Author
}

Options

Here are the available options for goaccessor:

Option	Short option	Description
--target	-t	Specify the target to be handled.
--getter	-g	Generate getter for the target.
--setter	-s	Generate setter for the target.
--accessor	-a	Generate both getter and setter for the target.
--pure-getter	-pg	Generate getter without 'Get' prefix for the target.
--prefix	-p	Add a prefix to the generated methods/functions.
--field	-f	Apply the flag (getter, setter, accessor) to each field of the target (only applicable for struct type variables).
--include	-i	Generate methods only for the specified fields (fields should be comma-separated).
--exclude	-e	Exclude specified fields from method generation (fields should be comma-separated).

Remember, when using the --pure-getter option, the generated getter methods won't have a 'Get' prefix. For instance, for a Book struct with a Title field, the getter will be Title() instead of GetTitle().

Dependency Management

If you do not want to install goaccessor and want to use it as a dependency for your project, follow these steps:

1. Go to your project directory and add the goaccessor dependency via go mod:

go get github.com/yujiachen-y/goaccessor@latest

2. Create a new file named tools.go (or any other name you like) with the following code:

//go:build tools

package main

import (
	_ "github.com/yujiachen-y/goaccessor"
)

3. If you want to use the goaccessor CLI command, use go run github.com/yujiachen-y/goaccessor@latest instead.

4. If you use go:generate directives to generate code, change the directives like this:

//go:generate go run github.com/yujiachen-y/goaccessor@latest -target book
var book Book

5. Note: even though goaccessor is a dependency of your project, it will not—and should not—be a part of your project's build result. We use a build flag in tools.go to ensure goaccessor is ignored during build.