easygen-commandlineFlag.go

$ easygen test/commandlineFlag 
package easygenapi

import (
        "flag"
        "fmt"
        "os"
)

////////////////////////////////////////////////////////////////////////////
// Constant and data type/structure definitions

const progname = "easygen" // os.Args[0]

// The Options struct defines the structure to holds the commandline values
type Options struct { 
        HTML            bool    // treat the template file as html instead of text
        TemplateStr             string  // template string (in text)
        TemplateFile            string  // .tmpl template file name (default: same as .yaml file)
        debug           int     // debugging level
}

////////////////////////////////////////////////////////////////////////////
// Global variables definitions

// Opts holds the actual values from the command line paramters
var Opts Options 

////////////////////////////////////////////////////////////////////////////
// Commandline definitions

func init() { 
        flag.BoolVar(&Opts.HTML, "html", false,
                "treat the template file as html instead of text")
        flag.StringVar(&Opts.TemplateStr, "ts", "",
                "template string (in text)")
        flag.StringVar(&Opts.TemplateFile, "tf", "",
                ".tmpl template file name (default: same as .yaml file)")
        flag.IntVar(&Opts.debug, "debug", 0,
                "debugging level")
}

// The Usage function shows help on commandline usage
func Usage() {
        fmt.Fprintf(os.Stderr,
                "nUsage:n %s [flags] YamlFileNamennFlags:nn",
                progname)
        flag.PrintDefaults()
        fmt.Fprintf(os.Stderr,
                "nYamlFileName: The name for the .yaml data and .tmpl template filentOnly the name part, without extension. Can include the path as well.n")
        os.Exit(0)
}