ReddRadar
Agent skill
go-cli
CLI application patterns and best practices
Install this agent skill to your Project
npx add-skill https://github.com/pluginagentmarketplace/custom-plugin-go/tree/main/skills/go-cli
SKILL.md
Go CLI Skill
Supplementary CLI patterns and utilities.
Overview
Additional CLI patterns for argument parsing, progress indicators, and user interaction.
Parameters
| Parameter | Type | Required | Default | Description |
|---|---|---|---|---|
| feature | string | yes | - | Feature: "progress", "prompt", "color" |
Core Topics
Argument Validation
var cmd = &cobra.Command{
Use: "process [file]",
Args: cobra.ExactArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
file := args[0]
if _, err := os.Stat(file); os.IsNotExist(err) {
return fmt.Errorf("file not found: %s", file)
}
return process(file)
},
}
Progress Bar
func DownloadWithProgress(url, dest string) error {
resp, err := http.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
file, err := os.Create(dest)
if err != nil {
return err
}
defer file.Close()
bar := progressbar.DefaultBytes(resp.ContentLength, "downloading")
_, err = io.Copy(io.MultiWriter(file, bar), resp.Body)
return err
}
Interactive Prompt
func ConfirmAction(message string) bool {
reader := bufio.NewReader(os.Stdin)
fmt.Printf("%s [y/N]: ", message)
input, _ := reader.ReadString('\n')
input = strings.TrimSpace(strings.ToLower(input))
return input == "y" || input == "yes"
}
Colored Output
import "github.com/fatih/color"
var (
successColor = color.New(color.FgGreen).SprintFunc()
errorColor = color.New(color.FgRed).SprintFunc()
warnColor = color.New(color.FgYellow).SprintFunc()
)
func PrintSuccess(msg string) {
fmt.Println(successColor("✓"), msg)
}
func PrintError(msg string) {
fmt.Fprintln(os.Stderr, errorColor("✗"), msg)
}
Troubleshooting
Failure Modes
| Symptom | Cause | Fix |
|---|---|---|
| Colors not showing | No TTY | Check isatty |
| Input hangs | Stdin closed | Handle EOF |
Usage
Skill("go-cli")
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