1 files changed, 121 insertions, 0 deletions
diff --git a/vendor/github.com/hashicorp/go-sockaddr/cmd/sockaddr/command/autohelp.go b/vendor/github.com/hashicorp/go-sockaddr/cmd/sockaddr/command/autohelp.go
new file mode 100644
index 000000000..082c53e27
--- /dev/null
+++ b/vendor/github.com/hashicorp/go-sockaddr/cmd/sockaddr/command/autohelp.go
@@ -0,0 +1,121 @@
+package command
+
+import (
+	"flag"
+	"fmt"
+	"sort"
+	"strings"
+
+	wordwrap "github.com/mitchellh/go-wordwrap"
+	"github.com/ryanuber/columnize"
+)
+
+// AutoHelp specifies the necessary methods required to have their help
+// completely generated for them.
+type AutoHelp interface {
+	Usage() string
+	Description() string
+	InitOpts()
+	VisitAllFlags(func(f *flag.Flag))
+}
+
+// MakeHelp generates a help string based on the capabilities of the Command
+func MakeHelp(c AutoHelp) string {
+	usageText := c.Usage()
+
+	// If the length of Usage() is zero, then assume this is a hidden
+	// command.
+	if len(usageText) == 0 {
+		return ""
+	}
+
+	descriptionText := wordwrap.WrapString(c.Description(), 60)
+	descrLines := strings.Split(descriptionText, "\n")
+	prefixedLines := make([]string, len(descrLines))
+	for i := range descrLines {
+		prefixedLines[i] = "  " + descrLines[i]
+	}
+	descriptionText = strings.Join(prefixedLines, "\n")
+
+	c.InitOpts()
+	flags := []*flag.Flag{}
+	c.VisitAllFlags(func(f *flag.Flag) {
+		flags = append(flags, f)
+	})
+	optionsText := OptionsHelpOutput(flags)
+
+	var helpOutput string
+	switch {
+	case len(optionsText) == 0 && len(descriptionText) == 0:
+		helpOutput = usageText
+	case len(optionsText) == 0:
+		helpOutput = fmt.Sprintf(`Usage: %s
+
+%s`,
+			usageText, descriptionText)
+	case len(descriptionText) == 0 && len(optionsText) > 0:
+		helpOutput = fmt.Sprintf(`Usage: %s
+
+Options:
+
+%s`,
+			usageText, optionsText)
+	default:
+		helpOutput = fmt.Sprintf(`Usage: %s
+
+%s
+
+Options:
+
+%s`,
+			usageText, descriptionText, optionsText)
+	}
+
+	return strings.TrimSpace(helpOutput)
+}
+
+// ByOptName implements sort.Interface for flag.Flag based on the Name field.
+type ByName []*flag.Flag
+
+func (a ByName) Len() int      { return len(a) }
+func (a ByName) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
+func (a ByName) Less(i, j int) bool {
+	// Bubble up single-char args to the top of the list
+	switch {
+	case len(a[i].Name) == 1 && len(a[j].Name) != 1:
+		return true
+	case len(a[i].Name) != 1 && len(a[j].Name) == 1:
+		return false
+	default:
+		// Case-insensitive sort.  Use case as a tie breaker, however.
+		a1 := strings.ToLower(a[i].Name)
+		a2 := strings.ToLower(a[j].Name)
+		if a1 == a2 {
+			return a[i].Name < a[j].Name
+		} else {
+			return a1 < a2
+		}
+	}
+}
+
+// OptionsHelpOutput returns a string of formatted options
+func OptionsHelpOutput(flags []*flag.Flag) string {
+	sort.Sort(ByName(flags))
+
+	var output []string
+	for _, f := range flags {
+		if len(f.Usage) == 0 {
+			continue
+		}
+
+		output = append(output, fmt.Sprintf("-%s | %s", f.Name, f.Usage))
+	}
+
+	optionsOutput := columnize.Format(output, &columnize.Config{
+		Delim:  "|",
+		Glue:   "  ",
+		Prefix: "  ",
+		Empty:  "",
+	})
+	return optionsOutput
+}