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main.go
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main.go
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package main
import (
"flag"
"log"
"os"
"os/user"
"strconv"
"strings"
"time"
"github.com/nishanths/go-hgconfig"
"github.com/tcnksm/go-gitconfig"
)
const (
nameEnv = "LICENSE_FULL_NAME"
versionString = "v5"
usageString = `Usage: license [flags] [license-type]
Flags:
-help print help information
-list print list of available license types
-n, -name full name to use on license (default %q)
-o, -output path to output file (prints to stdout if unspecified)
-v, -version print version
-y, -year year to use on license (default %q)
Examples:
license mit
license -name "Alice L" -year 2013 bsd-3-clause
license -o LICENSE.txt mpl-2.0`
)
var (
stdout = log.New(os.Stdout, "", 0)
stderr = log.New(os.Stderr, "", 0)
)
var (
fName string
fYear string
fOutput string
fVersion bool
fHelp bool
fList bool
)
func main() {
flag.StringVar(&fName, "name", "", "name on license")
flag.StringVar(&fName, "n", "", "name on license")
flag.StringVar(&fYear, "year", "", "year on license")
flag.StringVar(&fYear, "y", "", "year on license")
flag.StringVar(&fOutput, "output", "", "path to output file")
flag.StringVar(&fOutput, "o", "", "path to output file")
flag.BoolVar(&fVersion, "version", false, "print version")
flag.BoolVar(&fVersion, "v", false, "print version")
flag.BoolVar(&fHelp, "help", false, "print help")
flag.BoolVar(&fList, "list", false, "print available licenses")
flag.Usage = func() {
printUsage()
os.Exit(1)
}
flag.Parse()
run()
}
func run() {
if flag.NArg() != 1 && !(fVersion || fHelp || fList) {
printUsage()
os.Exit(1)
}
switch {
case fVersion:
printVersion()
os.Exit(0)
case fHelp:
printUsage()
os.Exit(0)
case fList:
printList()
os.Exit(0)
default:
license := strings.ToLower(flag.Arg(0))
printLicense(license, fOutput, getName(), getYear()) // internally calls os.Exit() on failure
}
}
func printVersion() {
stdout.Printf("%s", versionString)
}
func printUsage() {
stderr.Printf(usageString, getName(), getYear())
}
func getName() string {
if fName != "" {
return fName
}
n := os.Getenv(nameEnv)
if n != "" {
return n
}
n, err := gitconfig.Username()
if err == nil {
return n
}
n, err = gitconfig.Global("user.name")
if err == nil {
return n
}
n, err = hgconfig.Username()
if err == nil {
return n
}
usr, err := user.Current()
if err == nil {
return usr.Name
}
return ""
}
func getYear() string {
if fYear != "" {
return fYear
}
return strconv.Itoa(time.Now().Year())
}