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main.go
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main.go
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package main
import (
"flag"
"fmt"
"net/http"
"os"
"strings"
"github.com/davyj0nes/get-license/htmlparser"
"github.com/pkg/errors"
"golang.org/x/net/html"
)
func main() {
license := flag.String("license", "", "license to get")
flag.Usage = func() {
fmt.Printf("Usage: getlicense [options]\n\n")
flag.PrintDefaults()
fmt.Println(`List of Available Licenses:
- apache
- gpl
- mit
- mozilla
`)
}
flag.Parse()
URL, err := getLicenseURL(*license)
if err != nil {
panic(err)
}
licenseContent, err := getLicense(URL)
if err != nil {
panic(err)
}
fmt.Fprintln(os.Stdout, licenseContent)
}
// getLicense gets a string representation of the required license file
func getLicense(URL string) (string, error) {
resp, err := http.Get(URL)
if err != nil {
return "", errors.Wrap(err, "Error Calling URL")
}
defer resp.Body.Close()
doc, err := html.Parse(resp.Body)
if err != nil {
return "", errors.Wrap(err, "Error Parsing HTML")
}
licenseNode := htmlparser.GetElementByID(doc, "license-text")
licenseText := licenseNode.FirstChild.Data
return licenseText, nil
}
// getLicenseURL is a simple parser taking user arguments and returning a URL.
func getLicenseURL(license string) (string, error) {
baseURL := "https://choosealicense.com/licenses/"
license = strings.ToLower(license)
switch license {
case "apache":
return baseURL + "apache-2.0", nil
case "mit":
return baseURL + "mit", nil
case "mozilla":
return baseURL + "mpl-2.0", nil
case "gpl":
return baseURL + "gpl-3.0", nil
case "":
return "", fmt.Errorf("no license provided")
default:
return "", fmt.Errorf("unknown license: %s", license)
}
}