HomeCoursesPowerful Command-Line Applications in Go

Intermediate

30h

Powerful Command-Line Applications in Go

Gain insights into Go’s syntax and advanced concepts. Learn about building efficient CLI tools, automating tasks, data processing, and ensure robustness with testing and benchmarking techniques.

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Overview

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Go is a programming language that combines the advantages of static typing with the flexibility of dynamic typing. Its simplicity and prototyping capabilities make it an excellent choice for building command-line tools. It also offers features such as type safety, cross-compilation, testing, and benchmarking, enabling developers to handle complex scenarios. You’ll start by learning the foundations in Go’s fundamental syntax and progressively delve into advanced concepts. Then, you’ll learn to develop various command-line applications that can automate tasks, process data, parse logs, interact with network services and fulfill system requirements. In addition, the course also covers different testing and benchmarking techniques to ensure the speed and reliability of programs. After taking this course, you’ll be able to automate your work and enhance productivity. You’ll also be able to utilize the Go programming language to develop robust, cross-platform, efficient, and maintainable CLI applications.

Go is a programming language that combines the advantages of static typing with the flexibility of dynamic typing. Its simplicit...Show More

WHAT YOU'LL LEARN

An understanding of the fundamentals of the Go programming language, including its syntax and data types

A working knowledge of building command-line applications using Go

An understanding of command-line arguments, input and output, error handling, and testing

Familiarity with designing and implementing real-world applications using Go

An understanding of the fundamentals of the Go programming language, including its syntax and data types

Content

139 Lessons13 Quizzes

Introduction

2 Lessons

Get familiar with developing Go-based command-line tools and managing dependencies with Go modules.

About the Go Language

About This Course

First Command-Line Program in Go

7 Lessons

Get started with building, testing, and enhancing a basic word counter in Go.

Building a Basic Word Counter

Testing the Basic Word Counter

Command-Line Flags

Wrapping Up

Exercise: Counting Unicode Characters

Solution: Counting Unicode Characters

Quiz: Command-Line Program in Go Preface

Interacting with Users

14 Lessons

Examine building a flexible, user-friendly CLI to-do tool using Go’s functions and packages.

Defining the To-Do API

Creating the To-Do File

Creating the To-Do Test File

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

Wrapping Up

Exercise: Delete a To-Do item

Solution: Delete a To-Do Item

Quiz: Interacting with Users

Working with Files in Go

12 Lessons

Enhance your skills in file handling and testing by building a Markdown preview tool 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

Updating Functions to Improve the Markdown Preview Tool

Wrapping Up

Exercise: Working with Files

Solution: Working with Files

Quiz: Working with Files in Go

Navigating the File System

11 Lessons

Take a closer look at developing and testing a file system crawler in Go with archiving and logging.

Developing a File System Crawler

Testing with Table-Driven Testing

Deleting Matched Files

Testing with the Help of Test Helpers

Logging Deleted Files

Archiving Files

Updating the Function Archiving Files

Wrapping Up

Exercise: Restoring Files and Directories

Solution: Restoring Files and Directories

Quiz: Navigating File System

Improving the Performance of CLI Tools

14 Lessons

Follow the process of enhancing Go CLI tools with benchmarking, profiling, and concurrency.

Introduction to colStats

Developing the Initial Version of colStats

Final Touches to the Initial Version of colStats

Writing Tests for colStats

Testing colStats

Benchmarking Our Tool

Profiling Our Tool

Reducing Memory Allocation

Improving the colStats Tool to Process Files Concurrently

Reduce Scheduling Contention

Wrapping Up

Exercise: Benchmarking Functions

Solution: Benchmarking Functions

Quiz: Improving the Performance of CLI Tools

Controlling Processes

14 Lessons

Master the steps to automate CI tasks, handle errors, test commands, and manage output effectively.

Executing External Programs

Handling Errors

Writing Tests for Goci

Defining a Pipeline

Updating 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

Wrapping Up

Exercise: Capturing and Parsing Command Output

Solution: Capturing and Parsing Command Output

Quiz: Controlling Processes

Using the Cobra CLI Framework

16 Lessons

Step through developing a Go-based CLI tool using the Cobra framework, from initialization to testing.

Starting the Cobra Application

Navigating the New Cobra Application

Adding the First Subcommand to the Application

Starting the Scan Package

Creating the Subcommands to Manage Hosts

Manage the Hosts List Under the Hosts Subcommand

Testing the Manage Hosts Subcommands

Adding the Port Scanning Functionality

Testing the Port Scanning Functionality

Updating the Port Scanning Functionality

Using Viper for Configuration Management

Generating Command Completion and Documentation

Wrapping Up

Exercise: Adding and Validating Flags

Solution: Adding and Validating Flags

Quiz: Using the Cobra CLI Framework

Talking to REST API

16 Lessons

Walk through building and testing a Go REST API server and client for CRUD operations.

Developing a REST API Server

Testing the REST API Server

Completing the REST API Server

Adding Finishing Touches to the REST API Server

Developing the Initial Client for the REST API

Adding Finishing Touches to 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

Wrapping Up

Exercise: Talking to REST APIs over the Internet

Solution: Talking to REST APIs over the Internet

Quiz: Talking to REST API

10.

Developing Interactive Terminal Tools

12 Lessons

Go hands-on with developing interactive CLI tools, focusing on a Pomodoro timer.

Overview: 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

Wrapping Up

Exercise: Interactive Terminal Applications

Solution: Interactive Terminal Applications

Quiz: Developing Interactive Terminal Tools

11.

Persisting Data in a SQL Database

9 Lessons

Apply your skills to persisting Pomodoro app data in SQLite with testing, summaries, and visualizations.

Persisting Data in the Database

Testing the Repository with SQLite

Updating the Application to Use the SQLite Repository

Displaying a Summary to the Users

Displaying Historical Data to the Users

Wrapping Up

Exercise: Databases

Solution: Databases

Quiz: Persisting Data in a SQL Database

12.

Distributing Tool

8 Lessons

Gain tools for cross-OS notifications, customized builds, and process management in Go.

Starting the Notify Package

Including OS-Specific Files in the Build

Testing the Notify Package

Conditionally Building the Application

Wrapping Up

Exercise: Supporting Multiple Operating Systems

Solution: Supporting Multiple Operating Systems

Quiz: Distributing Tool

13.

Appendix

4 Lessons

Explore Go tracer for performance insights, SQLite installation, Go-SQLite integration, and containerized app compilation.

Tracing Our Tool

Getting Started with SQLite

Go, SQL, and SQLite

Compiling the Go Application for Containers

Certificate of Completion

Showcase your accomplishment by sharing your certificate of completion.

Course Author:

The Pragmatic Programmers

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