goaccessor

Overview ¶

Goaccessor provides a Go tool designed to automate the generation of getter and setter boilerplate code for your data 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.

Examples:

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:

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
}

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
}

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:

--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.
--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).

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.