godefault

godefault

Generate a standard implementation and tests from your interface declaration

As a software engineer I often ask myself "Is it worth the time?" before I start coding tools.

I found a nice xkcd addressing this issue by "[..] estimating how long can you work on making a routine task more efficient before you're spending more time than you save. [..]"

My typical development process is test-driven thus thinking about optimizing my code usually happens during the refactoring phase. Everytime I start with a simple function and a test and refactor that into structs with methods and an interface.

But if I refactor 50 times per day and each refactoring takes like 30 seconds then I will spend 4 weeks per year for that specific task...

Table of Contents

• Installation
• Steps to start

Installation

From Source

go install github.com/andygeiss/godefault

Steps to start

Create a new project and save the following source code into a file internal/core/core.go:

package core

import "github.com/andygeiss/utils/message"

//go:generate godefault

type ContractorPortalClient interface {
	Error() (err error)
	WithMessageBus(mb message.Bus)
}

type MarketManager interface {
	Error() (err error)
	WithMessageBus(mb message.Bus)
	WithRegulationEngine(e RegulationEngine) MarketManager
	WithProjectResourceAccess(ra ProjectResourceAccess) MarketManager
	WithWorkflowResourceAccess(ra ProjectResourceAccess) MarketManager
}

type ProjectResourceAccess interface {
	Error() (err error)
}

type WorkflowResourceAccess interface {
	Error() (err error)
}

type RegulationEngine interface {
	Error() (err error)
	WithRegulationResourceAccess(ra RegulationResourceAccess) RegulationEngine
}

type RegulationResourceAccess interface {
	Error() (err error)
}

Create and initialize a new module:

go mod init
go mod tidy

Finally, generate the default implementation:

go generate ./...

This will create a PlantUML internal/core/core.puml ...

... and Go sources and tests as boilerplate.

C:.                                              
|   go.mod                                       
|   go.sum                                       
|                                                
\---internal                                     
    \---core                                     
            core.go                              
            core.puml                            
            defaultContractorPortalClient.go     
            defaultContractorPortalClient_test.go
            defaultMarketManager.go              
            defaultMarketManager_test.go         
            defaultProjectResourceAccess.go      
            defaultProjectResourceAccess_test.go
            defaultRegulationEngine.go           
            defaultRegulationEngine_test.go
            defaultRegulationResourceAccess.go
            defaultRegulationResourceAccess_test.go
            defaultWorkflowResourceAccess.go
            defaultWorkflowResourceAccess_test.go