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cli.go

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// Package cli provides a minimal framework for creating and organizing command line

// Go applications. cli is designed to be easy to understand and write, the most simple

// cli application can be written as follows:

//

// func main() {

// (&cli.Command{}).Run(context.Background(), os.Args)

// }

//

// Of course this application does not do much, so let's make this an actual application:

//

// func main() {

// cmd := &cli.Command{

// Name: "greet",

// Usage: "say a greeting",

// Action: func(c *cli.Context) error {

// fmt.Println("Greetings")

// return nil

// },

// }

//

// cmd.Run(context.Background(), os.Args)

// }

package cli

import (

"fmt"

"os"

"runtime"

"strings"

)

var isTracingOn = os.Getenv("URFAVE_CLI_TRACING") == "on"

func tracef(format string, a ...any) {

if !isTracingOn {

return

}

if !strings.HasSuffix(format, "\n") {

format = format + "\n"

}

pc, file, line, _ := runtime.Caller(1)

cf := runtime.FuncForPC(pc)

fmt.Fprintf(

os.Stderr,

strings.Join([]string{

"## URFAVE CLI TRACE ",

file,

":",

fmt.Sprintf("%v", line),

" ",

fmt.Sprintf("(%s)", cf.Name()),

" ",

format,

}, ""),

a...,

)

}