Cursor rule

1---
2description: "Go patterns extending common rules"
3globs: ["**/*.go", "**/go.mod", "**/go.sum"]
4alwaysApply: false
5---
6# Go Patterns
7 
8> This file extends the common patterns rule with Go specific content.
9 
10## Functional Options
11 
12```go
13type Option func(*Server)
14 
15func WithPort(port int) Option {
16    return func(s *Server) { s.port = port }
17}
18 
19func NewServer(opts ...Option) *Server {
20    s := &Server{port: 8080}
21    for _, opt := range opts {
22        opt(s)
23    }
24    return s
25}
26```
27 
28## Small Interfaces
29 
30Define interfaces where they are used, not where they are implemented.
31 
32## Dependency Injection
33 
34Use constructor functions to inject dependencies:
35 
36```go
37func NewUserService(repo UserRepository, logger Logger) *UserService {
38    return &UserService{repo: repo, logger: logger}
39}
40```
41 
42## Reference
43 
44See skill: `golang-patterns` for comprehensive Go patterns including concurrency, error handling, and package organization.
45