Learning Go by examples: part 3 - Create a CLI app in Go

• learning-go-by-examples

  5 145 5.0 Go

We created our Git repository in the previous article, so now we just have to retrieve it locally:

• cobra

  129 36,166 7.8 Go

  A Commander for modern Go CLI interactions

Cobra is both a library for creating powerful modern CLI applications and a program for generating applications and batch files.

• InfluxDB

  www.influxdata.com featured

  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

• gophers

  4 30 3.7

  Gopher artwork (Golang mascot) (by scraly)

var getCmd = &cobra.Command{ Use: "get", Short: "This command will get the desired Gopher", Long: `This get command will call GitHub respository in order to return the desired Gopher.`, Run: func(cmd *cobra.Command, args []string) { var gopherName = "dr-who.png" if len(args) >= 1 && args[0] != "" { gopherName = args[0] } URL := "https://github.com/scraly/gophers/raw/main/" + gopherName + ".png" fmt.Println("Try to get '" + gopherName + "' Gopher...") // Get the data response, err := http.Get(URL) if err != nil { fmt.Println(err) } defer response.Body.Close() if response.StatusCode == 200 { // Create the file out, err := os.Create(gopherName + ".png") if err != nil { fmt.Println(err) } defer out.Close() // Writer the body to file _, err = io.Copy(out, response.Body) if err != nil { fmt.Println(err) } fmt.Println("Perfect! Just saved in " + out.Name() + "!") } else { fmt.Println("Error: " + gopherName + " not exists! :-(") } }, }

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