migrate to upstream libcompose in one and a half go

vendor/github.com/codegangsta/cli/help.go

@@ -1,6 +1,12 @@
 package cli
 
-import "fmt"
+import (
+	"fmt"
+	"io"
+	"strings"
+	"text/tabwriter"
+	"text/template"
+)
 
 // The text template for the Default help topic.
 // cli.go uses text/template to render templates. You can
@@ -9,30 +15,33 @@ var AppHelpTemplate = `NAME:
    {{.Name}} - {{.Usage}}
 
 USAGE:
-   {{.Name}} {{if .Flags}}[global options] {{end}}command{{if .Flags}} [command options]{{end}} [arguments...]
-
+   {{.HelpName}} {{if .Flags}}[global options]{{end}}{{if .Commands}} command [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}
+   {{if .Version}}
 VERSION:
    {{.Version}}
-
-AUTHOR(S): 
-	{{range .Authors}}{{ . }} {{end}}
-
+   {{end}}{{if len .Authors}}
+AUTHOR(S):
+   {{range .Authors}}{{ . }}{{end}}
+   {{end}}{{if .Commands}}
 COMMANDS:
-   {{range .Commands}}{{.Name}}{{with .ShortName}}, {{.}}{{end}}{{ "\t" }}{{.Usage}}
-   {{end}}{{if .Flags}}
+   {{range .Commands}}{{join .Names ", "}}{{ "\t" }}{{.Usage}}
+   {{end}}{{end}}{{if .Flags}}
 GLOBAL OPTIONS:
    {{range .Flags}}{{.}}
-   {{end}}{{end}}
+   {{end}}{{end}}{{if .Copyright }}
+COPYRIGHT:
+   {{.Copyright}}
+   {{end}}
 `
 
 // The text template for the command help topic.
 // cli.go uses text/template to render templates. You can
 // render custom help text by setting this variable.
 var CommandHelpTemplate = `NAME:
-   {{.Name}} - {{.Usage}}
+   {{.HelpName}} - {{.Usage}}
 
 USAGE:
-   command {{.Name}}{{if .Flags}} [command options]{{end}} [arguments...]{{if .Description}}
+   {{.HelpName}}{{if .Flags}} [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{if .Description}}
 
 DESCRIPTION:
    {{.Description}}{{end}}{{if .Flags}}
@@ -46,13 +55,13 @@ OPTIONS:
 // cli.go uses text/template to render templates. You can
 // render custom help text by setting this variable.
 var SubcommandHelpTemplate = `NAME:
-   {{.Name}} - {{.Usage}}
+   {{.HelpName}} - {{.Usage}}
 
 USAGE:
-   {{.Name}} command{{if .Flags}} [command options]{{end}} [arguments...]
+   {{.HelpName}} command{{if .Flags}} [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}
 
 COMMANDS:
-   {{range .Commands}}{{.Name}}{{with .ShortName}}, {{.}}{{end}}{{ "\t" }}{{.Usage}}
+   {{range .Commands}}{{join .Names ", "}}{{ "\t" }}{{.Usage}}
    {{end}}{{if .Flags}}
 OPTIONS:
    {{range .Flags}}{{.}}
@@ -61,8 +70,9 @@ OPTIONS:
 
 var helpCommand = Command{
 	Name:      "help",
-	ShortName: "h",
+	Aliases:   []string{"h"},
 	Usage:     "Shows a list of commands or help for one command",
+	ArgsUsage: "[command]",
 	Action: func(c *Context) {
 		args := c.Args()
 		if args.Present() {
@@ -75,8 +85,9 @@ var helpCommand = Command{
 
 var helpSubcommand = Command{
 	Name:      "help",
-	ShortName: "h",
+	Aliases:   []string{"h"},
 	Usage:     "Shows a list of commands or help for one command",
+	ArgsUsage: "[command]",
 	Action: func(c *Context) {
 		args := c.Args()
 		if args.Present() {
@@ -87,47 +98,46 @@ var helpSubcommand = Command{
 	},
 }
 
-// Prints help for the App
-type helpPrinter func(templ string, data interface{})
+// Prints help for the App or Command
+type helpPrinter func(w io.Writer, templ string, data interface{})
 
-var HelpPrinter helpPrinter = nil
+var HelpPrinter helpPrinter = printHelp
 
 // Prints version for the App
 var VersionPrinter = printVersion
 
 func ShowAppHelp(c *Context) {
-	HelpPrinter(AppHelpTemplate, c.App)
+	HelpPrinter(c.App.Writer, AppHelpTemplate, c.App)
 }
 
 // Prints the list of subcommands as the default app completion method
 func DefaultAppComplete(c *Context) {
 	for _, command := range c.App.Commands {
-		fmt.Fprintln(c.App.Writer, command.Name)
-		if command.ShortName != "" {
-			fmt.Fprintln(c.App.Writer, command.ShortName)
+		for _, name := range command.Names() {
+			fmt.Fprintln(c.App.Writer, name)
 		}
 	}
 }
 
 // Prints help for the given command
-func ShowCommandHelp(c *Context, command string) {
+func ShowCommandHelp(ctx *Context, command string) {
 	// show the subcommand help for a command with subcommands
 	if command == "" {
-		HelpPrinter(SubcommandHelpTemplate, c.App)
+		HelpPrinter(ctx.App.Writer, SubcommandHelpTemplate, ctx.App)
 		return
 	}
 
-	for _, c := range c.App.Commands {
+	for _, c := range ctx.App.Commands {
 		if c.HasName(command) {
-			HelpPrinter(CommandHelpTemplate, c)
+			HelpPrinter(ctx.App.Writer, CommandHelpTemplate, c)
 			return
 		}
 	}
 
-	if c.App.CommandNotFound != nil {
-		c.App.CommandNotFound(c, command)
+	if ctx.App.CommandNotFound != nil {
+		ctx.App.CommandNotFound(ctx, command)
 	} else {
-		fmt.Fprintf(c.App.Writer, "No help topic for '%v'\n", command)
+		fmt.Fprintf(ctx.App.Writer, "No help topic for '%v'\n", command)
 	}
 }
 
@@ -161,22 +171,42 @@ func ShowCommandCompletions(ctx *Context, command string) {
 	}
 }
 
-func checkVersion(c *Context) bool {
-	if c.GlobalBool("version") {
-		ShowVersion(c)
-		return true
+func printHelp(out io.Writer, templ string, data interface{}) {
+	funcMap := template.FuncMap{
+		"join": strings.Join,
 	}
 
-	return false
+	w := tabwriter.NewWriter(out, 0, 8, 1, '\t', 0)
+	t := template.Must(template.New("help").Funcs(funcMap).Parse(templ))
+	err := t.Execute(w, data)
+	if err != nil {
+		panic(err)
+	}
+	w.Flush()
+}
+
+func checkVersion(c *Context) bool {
+	found := false
+	if VersionFlag.Name != "" {
+		eachName(VersionFlag.Name, func(name string) {
+			if c.GlobalBool(name) || c.Bool(name) {
+				found = true
+			}
+		})
+	}
+	return found
 }
 
 func checkHelp(c *Context) bool {
-	if c.GlobalBool("h") || c.GlobalBool("help") {
-		ShowAppHelp(c)
-		return true
+	found := false
+	if HelpFlag.Name != "" {
+		eachName(HelpFlag.Name, func(name string) {
+			if c.GlobalBool(name) || c.Bool(name) {
+				found = true
+			}
+		})
 	}
-
-	return false
+	return found
 }
 
 func checkCommandHelp(c *Context, name string) bool {