aboutsummaryrefslogblamecommitdiffstats
path: root/_examples/common.go
blob: 2719c0ecf618cd9a744549ab1b39655febd0b2ca (plain) (tree)
1
2
3
4
5
6
7
8
9


                
             

                 

 
                                                                          
                                      






                                                                           
                                                                        




                              
                                                                          


                  
                                                                              
                                               
                                                                         

 
                                              
                                                  
                                                                         
 
package examples

import (
	"fmt"
	"os"
	"strings"
)

// CheckArgs should be used to esnure the right command line arguments are
// passed before executing an example.
func CheckArgs(arg ...string) {
	if len(os.Args) < len(arg)+1 {
		Warning("Usage: %s %s", os.Args[0], strings.Join(arg, " "))
		os.Exit(1)
	}
}

// CheckIfError should be used to naively panics if an error is not nil.
func CheckIfError(err error) {
	if err == nil {
		return
	}

	fmt.Printf("\x1b[31;1m%s\x1b[0m\n", fmt.Sprintf("error: %s", err))
	os.Exit(1)
}

// Info should be used to describe the example commands that are about to run.
func Info(format string, args ...interface{}) {
	fmt.Printf("\x1b[34;1m%s\x1b[0m\n", fmt.Sprintf(format, args...))
}

// Warning should be used to display a warning
func Warning(format string, args ...interface{}) {
	fmt.Printf("\x1b[36;1m%s\x1b[0m\n", fmt.Sprintf(format, args...))
}