, also known as Visual Studio Code, is a highly versatile and feature-rich code editor that has won the hearts of developers worldwide. With its clean and intuitive interface, it provides a delightful coding experience, making it a top choice for many professionals and enthusiasts alike. VSCode , we saw how to configure useful user snippets. Now I want to explore its debugging capabilities. In a previous article of mine In this short article, we'll see how to debug a app written in . CLI Golang Sample CLI Here's our very simple app, which takes command-line arguments: cmd/main.go package main


import (
    "fmt"
    "os"


    "github.com/jessevdk/go-flags"
)


var opts struct {
    Name  string `short:"n" long:"name" description:"name" required:"true"`
    Age   int    `short:"a" long:"age" description:"age" required:"true"`
    Email string `short:"e" long:"email" description:"email" required:"true"`
}


func run(args []string) {
    flags.ParseArgs(&opts, args)
    fmt.Printf("opts.Name: %v\n", opts.Name)
    fmt.Printf("opts.Age: %v\n", opts.Age)
    fmt.Printf("opts.Email: %v\n", opts.Email)
}


func main() {
    run(os.Args)
} Once again, as I did , I'm using instead of the core package since it has several advantages. in this article about Golang, Kafka, and MongoDB real-time data processing github.com/jessevdk/go-flags flag To run it, we do: $ go run cmd/main.go --name Tiago --age 39 --email tiago@email.com
Name: Tiago
Age: 39
Email: tiago@email.com Nice. Of course, we're not doing anything useful in this simple app. But what if we have a complex app and need to debug it? CLI Debugging it In , click on "Run and Debug" and then "create a launch.json file": VSCode Next, select "Go: Launch Package" option and hit enter: Then, we'll replace the sample JSON with this one: {
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Launch Package",
            "type": "go",
            "request": "launch",
            "mode": "auto",
            "program": "cmd/main.go",
            "args": [
                "--name",
                "Tiago",
                "--age",
                "39",
                "--email",
                "tiago@email.com"
            ]
        }
    ]
} is the path to the file that contains the `main` function program is the string array where you pass the desired command line arguments args When you save it, the "Run and Debug" view will look like this: Now let's come back to our `cmd/main.go` file and put a break point: Similarly to other , you put a break point by double-clicking on the left side of the line number. IDEs Now, back to "Run and Debug" view; just click on the green play icon: Then the little debug toolbar will be displayed, enabling us to continue, step over, step into, step out, restart, and stop the debugging session. We'll see the output in "debug console.”

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Golang: Debugging CLI Applications in VSCode

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Tiago Melo

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About Author

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