Extract some code in packages

- This will help split stuff in smaller, better tested packages
- This moves some stuff like the traefik command to package `cmd`

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

cmd/traefik/bug.go

@@ -0,0 +1,114 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/url"
+	"os/exec"
+	"regexp"
+	"runtime"
+	"text/template"
+
+	"github.com/containous/flaeg"
+	"github.com/mvdan/xurls"
+)
+
+var (
+	bugtracker  = "https://github.com/containous/traefik/issues/new"
+	bugTemplate = `### What version of Traefik are you using?
+` + "```" + `
+{{.Version}}
+` + "```" + `
+
+### What is your environment & configuration (arguments, toml...)?
+` + "```" + `
+{{.Configuration}}
+` + "```" + `
+
+### What did you do?
+
+
+### What did you expect to see?
+
+
+### What did you see instead?
+
+
+### If applicable, please paste the log output in debug mode ('--debug' switch)
+`
+)
+
+// newBugCmd builds a new Bug command
+func newBugCmd(traefikConfiguration interface{}, traefikPointersConfiguration interface{}) *flaeg.Command {
+
+	//version Command init
+	return &flaeg.Command{
+		Name:                  "bug",
+		Description:           `Report an issue on Traefik bugtracker`,
+		Config:                traefikConfiguration,
+		DefaultPointersConfig: traefikPointersConfiguration,
+		Run: func() error {
+			var version bytes.Buffer
+			if err := getVersionPrint(&version); err != nil {
+				return err
+			}
+
+			tmpl, err := template.New("").Parse(bugTemplate)
+			if err != nil {
+				return err
+			}
+
+			configJSON, err := json.MarshalIndent(traefikConfiguration, "", " ")
+			if err != nil {
+				return err
+			}
+
+			v := struct {
+				Version       string
+				Configuration string
+			}{
+				Version:       version.String(),
+				Configuration: anonymize(string(configJSON)),
+			}
+
+			var bug bytes.Buffer
+			if err := tmpl.Execute(&bug, v); err != nil {
+				return err
+			}
+
+			body := bug.String()
+			url := bugtracker + "?body=" + url.QueryEscape(body)
+			if err := openBrowser(url); err != nil {
+				fmt.Print("Please file a new issue at " + bugtracker + " using this template:\n\n")
+				fmt.Print(body)
+			}
+
+			return nil
+		},
+		Metadata: map[string]string{
+			"parseAllSources": "true",
+		},
+	}
+}
+
+func openBrowser(url string) error {
+	var err error
+	switch runtime.GOOS {
+	case "linux":
+		err = exec.Command("xdg-open", url).Start()
+	case "windows":
+		err = exec.Command("rundll32", "url.dll,FileProtocolHandler", url).Start()
+	case "darwin":
+		err = exec.Command("open", url).Start()
+	default:
+		err = fmt.Errorf("unsupported platform")
+	}
+	return err
+}
+
+func anonymize(input string) string {
+	replace := "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
+	mailExp := regexp.MustCompile(`\w[-._\w]*\w@\w[-._\w]*\w\.\w{2,3}"`)
+	return xurls.Relaxed.ReplaceAllString(mailExp.ReplaceAllString(input, replace), replace)
+}