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Powerful Command-Line Applications in Go Table of Contents

Powerful Command-Line Applications in Go by Ricardo Gerardi

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1. Your First Command-Line Program in Go

Building the Basic Word Counter
Testing the Basic Word Counter
Adding Command-Line Flags
Compiling Your Tool for Different Platforms
Exercises
Wrapping Up

2. Interacting with Your Users

Organizing Your Code
Defining the To-Do API
Creating the Initial To-Do Command-Line Tool
Testing the Initial CLI Implementation
Handling Multiple Command-Line Options
Display Command-Line Tool Usage
Improving the List Output Format
Increasing Flexibility with Environment Variables
Capturing Input from STDIN
Exercises
Wrapping Up

3. Working with Files in Go

Creating a Basic Markdown Preview Tool
Writing Tests for the Markdown Preview Tool
Adding Temporary Files to the Markdown Preview Tool
Using Interfaces to Automate Tests
Adding an Auto-Preview Feature
Cleaning Up Temporary Files
Improving the Markdown Preview Tool with Templates
Exercises
Wrapping Up

4. Navigating the File System

5. Improving the Performance of Your CLI Tools

Developing the Initial Version of colStats
Writing Tests for colStats
Benchmarking Your Tool
Profiling Your Tool
Reducing Memory Allocation
Tracing Your Tool
Improving the colStats Tool to Process Files Concurrently
Reduce Scheduling Contention
Exercises
Wrapping Up

6. Controlling Processes

Executing External Programs
Handling Errors
Writing Tests for Goci
Defining a Pipeline
Adding Another Step to the Pipeline
Handling Output from External Programs
Running Commands with Contexts
Integration Tests with a Local Git Server
Testing Commands with Mock Resources
Handling Signals
Exercises
Wrapping Up

7. Using the Cobra CLI Framework

Starting Your Cobra Application
Navigating Your New Cobra Application
Adding the First Subcommand to Your Application
Starting the Scan Package
Creating the Subcommands to Manage Hosts
Testing the Manage Hosts Subcommands
Adding the Port Scanning Functionality
Using Viper for Configuration Management
Generating Command Completion and Documentation
Exercises
Wrapping Up

8. Talking to REST APIs

Developing a REST API Server
Testing the REST API Server
Completing the REST API Server
Developing the Initial Client for the REST API
Testing the Client Without Connecting to the API
Viewing a Single Item
Adding an Item
Testing HTTP Requests Locally
Completing and Deleting Items
Executing Integration Tests
Exercises
Wrapping Up

9. Developing Interactive Terminal Tools

Initializing the Pomodoro Application
Storing Data with the Repository Pattern
Testing the Pomodoro Functionality
Building the Interface Widgets
Organizing the Interface’s Layout
Building the Interactive Interface
Initializing the CLI with Cobra
Exercises
Wrapping Up

10. Persisting Data in a SQL Database

Getting Started with SQLite
Go, SQL, and SQLite
Persisting Data in the Database
Testing the Repository with SQLite
Updating the Application to Use the SQLite Repository
Displaying a Summary to the Users
Exercises
Wrapping Up

11. Distributing Your Tool

Starting the Notify Package
Including OS-Specific Data
Including OS-Specific Files in the Build
Testing the Notify Package
Conditionally Building Your Application
Cross-Compiling Your Application
Compiling Your Go Application for Containers
Distributing Your Application as Source Code
Exercises
Wrapping Up

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