cloud-control-panel/config.go

package main

/* 
	This simply parses the command line arguments using the default golang
	package called 'flag'. This can be used as a simple template to parse
	command line arguments in other programs.

	It puts everything in the 'config' package which I think is a good
	wrapper around the 'flags' package and doesn't need a whole mess of
	global variables
*/

import "log"
import "os"
import "os/user"
import "flag"
import "fmt"
import "runtime"

import "github.com/gookit/config"
import "github.com/gookit/config/yaml"
import "github.com/gookit/config/json"

// import "github.com/davecgh/go-spew/spew"

// always override the debugging flag from the command line
var debugging	*bool

var customUsage = func() {
	fmt.Fprintf(flag.CommandLine.Output(), "Usage of %s:\n", os.Args[0])
	flag.PrintDefaults()

	fmt.Println("")
	fmt.Println("EXAMPLES:")
	fmt.Println("")
	fmt.Println(os.Args[0] + "--hostname test.hostname.wit.com")
	fmt.Println("")
}

func parseFlags() {
	var version	string
	var hostname	string
	var height	int

	flag.StringVar  (&version,       "version",       "v0.1",       "Set compiled in version string")
	flag.StringVar  (&hostname,      "hostname",      "localhost",  "Your full hostname")
	flag.IntVar     (&height,        "height",        600,          "Height of the Window")

	width		:= flag.Int ("width",         400,          "Width of the Window")
	debugging	 = flag.Bool("debugging",     false,        "Enable debugging")
	nogui		:= flag.Bool("nogui",         false,        "Do not display the GUI")

	// Set the output if something fails to stdout rather than stderr
	flag.CommandLine.SetOutput(os.Stdout)

	flag.Usage = customUsage
	flag.Parse()

	if flag.Parsed() {
		log.Println("flag.Parse() worked")
	} else {
		log.Println("flag.Parse() failed")
		onExit(nil)
	}

	log.Println("ENABLE width =", *width)
	log.Println("ENABLE nogui =", *nogui)
	log.Println("ENABLE debugging =", *debugging)

	// if (debugging == true) {
	if (*debugging) {
		log.Println("ENABLE width =", *width)
		log.Println("ENABLE debugging =", *debugging)
	} else {
		log.Println("DISABLE DEBUG debugging =", *debugging)
	}
	// os.Exit(0)

	config.Set("width", *width)
	config.Set("height", height)
	config.Set("hostname", hostname)
	config.Set("nogui", *nogui)
	config.Set("debugging", *debugging)
	log.Println("config.Set width", config.String("width"))
	log.Println("config.Set debugging", config.Bool("debugging"))
}

func parseConfig(defaultConfig string) {
	config.WithOptions(config.ParseEnv)
	parseFlags()

	log.Println("config.Set width", config.String("width"))
	log.Println("config.Set debugging", config.Bool("debugging"))

	config.LoadOSEnv([]string{"MAIL"})
	config.LoadOSEnv([]string{"USER"})
	config.LoadOSEnv([]string{"BUILDDEBUG"})

	// add driver for support of yaml and json
	config.AddDriver(yaml.Driver)
	config.AddDriver(json.Driver)

	// look up the user information to try to figure out where the config file is stored
	user, err := user.Current()
	if err != nil {
		onExit(err)
	}

	// TODO: figure out how to look for this file in the right
	// place under Linux, MacOS and Windows
	if runtime.GOOS == "linux" {
		log.Println("OS: Linux")
		config.Set("configfile", user.HomeDir + "/.config/cloud-control-panel.json")
	} else if runtime.GOOS == "windows" {
		log.Println("OS: Windows")
		config.Set("configfile", user.HomeDir + "\\cloud-control-panel.json")
	} else {
		log.Println("OS: " + runtime.GOOS)
		config.Set("configfile", user.HomeDir + "/cloud-control-panel.json")
	}

	// TODO: load the default config file from the resources dir if the config file doesn't exist yet
	// config.LoadFiles("config.json")

	filename := config.String("configfile")
	config.LoadFiles(filename)

	// always override the debugging flag from the command line
	config.Set("debugging", *debugging)

	for _, addr := range config.Strings("arr1") {
		log.Println("addr =", addr)
	}

	map1 := config.StringMap("map1")
	fmt.Printf("%#v\n",map1)

	log.Println(config.String("map1.key1.jwc1"))

	for account, _ := range config.StringMap("cloud") {
		port	:= config.String("accounts." + account + ".port")
		proto	:= config.String("accounts." + account + ".proto")
		hostname := config.String("accounts." + account + ".hostname")
		fmt.Println(account, hostname, port, proto)
	}

	if (config.String("nogui") == "true") {
		log.Println("DO NOT DISPLAY THE GUI")
	}

	if (config.String("debugging") == "true") {
		log.Println("ENABLE DEBUG", config.String("debugging"))
		log.Println("ENABLE DEBUG", config.Bool("debugging"))
	} else {
		log.Println("DISABLE DEBUG", config.String("debugging"))
		log.Println("DISABLE DEBUG", config.Bool("debugging"))
	}
}