how-do-i-write-cobra-cli-command-output-to-a-csv-file-in-golang.md

June 20, 2023 TIL - AI Prompt - Q&A: How Do I Write Cobra-Cli Command Output to a CSV File in Golang?

AI Prompt

Q&A

How Do I Write Cobra-Cli Command Output to a CSV File in Golang?

AI Response

To write cobra-cli command output to a CSV file in Golang, you can follow these steps:

1. Import the necessary packages:

import (
    "encoding/csv"
    "os"
    "github.com/spf13/cobra"
)

2. Create a new command using the Cobra library:

var rootCmd = &cobra.Command{
    Use:   "mycommand",
    Short: "A brief description of your command",
    Run: func(cmd *cobra.Command, args []string) {
        // Your command logic here
    },
}

3. Add a flag to specify the output CSV file:

var outputFile string

func init() {
    rootCmd.PersistentFlags().StringVarP(&outputFile, "output", "o", "", "output CSV file")
}

4. Inside the Run function, execute the command and write the output to the CSV file:

func runCommand(cmd *cobra.Command, args []string) {
    // Execute your command and get the output
    output := executeCommand()

    // Open the output CSV file
    file, err := os.Create(outputFile)
    if err != nil {
        fmt.Println("Error creating output file:", err)
        return
    }
    defer file.Close()

    // Create a CSV writer
    writer := csv.NewWriter(file)
    defer writer.Flush()

    // Write the output to the CSV file
    for _, row := range output {
        err := writer.Write(row)
        if err != nil {
            fmt.Println("Error writing to CSV file:", err)
            return
        }
    }
}

5. Finally, add the command to the root command and execute it:

func main() {
    if err := rootCmd.Execute(); err != nil {
        fmt.Println(err)
        os.Exit(1)
    }
}

Make sure to replace executeCommand() with the actual function or code that executes your cobra-cli command and returns the output as a 2D slice of strings.

You can then run your command with the --output flag to specify the output CSV file:

$ go run main.go mycommand --output=output.csv

This will execute your cobra-cli command and write the output to the specified CSV file.

Use Cases

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References

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