add config watch

node/controller/legoCmd/cmd/cmd_dnshelp.go

@@ -0,0 +1,73 @@
+package cmd
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strings"
+	"text/tabwriter"
+
+	"github.com/urfave/cli"
+)
+
+func createDNSHelp() cli.Command {
+	return cli.Command{
+		Name:   "dnshelp",
+		Usage:  "Shows additional help for the '--dns' global option",
+		Action: dnsHelp,
+		Flags: []cli.Flag{
+			cli.StringFlag{
+				Name:  "code, c",
+				Usage: fmt.Sprintf("DNS code: %s", allDNSCodes()),
+			},
+		},
+	}
+}
+
+func dnsHelp(ctx *cli.Context) error {
+	code := ctx.String("code")
+	if code == "" {
+		w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
+		ew := &errWriter{w: w}
+
+		ew.writeln(`Credentials for DNS providers must be passed through environment variables.`)
+		ew.writeln()
+		ew.writeln(`To display the documentation for a DNS providers:`)
+		ew.writeln()
+		ew.writeln("\t$ lego dnshelp -c code")
+		ew.writeln()
+		ew.writeln("All DNS codes:")
+		ew.writef("\t%s\n", allDNSCodes())
+		ew.writeln()
+		ew.writeln("More information: https://go-acme.github.io/lego/dns")
+
+		if ew.err != nil {
+			return ew.err
+		}
+
+		return w.Flush()
+	}
+
+	return displayDNSHelp(strings.ToLower(code))
+}
+
+type errWriter struct {
+	w   io.Writer
+	err error
+}
+
+func (ew *errWriter) writeln(a ...interface{}) {
+	if ew.err != nil {
+		return
+	}
+
+	_, ew.err = fmt.Fprintln(ew.w, a...)
+}
+
+func (ew *errWriter) writef(format string, a ...interface{}) {
+	if ew.err != nil {
+		return
+	}
+
+	_, ew.err = fmt.Fprintf(ew.w, format, a...)
+}