TUN-528: Move cloudflared into a separate repo

vendor/gopkg.in/urfave/cli.v2/command.go

@@ -0,0 +1,270 @@
+package cli
+
+import (
+	"fmt"
+	"io/ioutil"
+	"sort"
+	"strings"
+)
+
+// Command is a subcommand for a cli.App.
+type Command struct {
+	// The name of the command
+	Name string
+	// A list of aliases for the command
+	Aliases []string
+	// A short description of the usage of this command
+	Usage string
+	// Custom text to show on USAGE section of help
+	UsageText string
+	// A longer explanation of how the command works
+	Description string
+	// A short description of the arguments of this command
+	ArgsUsage string
+	// The category the command is part of
+	Category string
+	// The function to call when checking for shell command completions
+	ShellComplete ShellCompleteFunc
+	// An action to execute before any sub-subcommands are run, but after the context is ready
+	// If a non-nil error is returned, no sub-subcommands are run
+	Before BeforeFunc
+	// An action to execute after any subcommands are run, but after the subcommand has finished
+	// It is run even if Action() panics
+	After AfterFunc
+	// The function to call when this command is invoked
+	Action ActionFunc
+	// Execute this function if a usage error occurs.
+	OnUsageError OnUsageErrorFunc
+	// List of child commands
+	Subcommands []*Command
+	// List of flags to parse
+	Flags []Flag
+	// Treat all flags as normal arguments if true
+	SkipFlagParsing bool
+	// Boolean to hide built-in help command
+	HideHelp bool
+	// Boolean to hide this command from help or completion
+	Hidden bool
+
+	// Full name of command for help, defaults to full command name, including parent commands.
+	HelpName        string
+	commandNamePath []string
+
+	// CustomHelpTemplate 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.
+	CustomHelpTemplate string
+}
+
+type CommandsByName []*Command
+
+func (c CommandsByName) Len() int {
+	return len(c)
+}
+
+func (c CommandsByName) Less(i, j int) bool {
+	return c[i].Name < c[j].Name
+}
+
+func (c CommandsByName) Swap(i, j int) {
+	c[i], c[j] = c[j], c[i]
+}
+
+// FullName returns the full name of the command.
+// For subcommands this ensures that parent commands are part of the command path
+func (c *Command) FullName() string {
+	if c.commandNamePath == nil {
+		return c.Name
+	}
+	return strings.Join(c.commandNamePath, " ")
+}
+
+// Run invokes the command given the context, parses ctx.Args() to generate command-specific flags
+func (c *Command) Run(ctx *Context) (err error) {
+	if len(c.Subcommands) > 0 {
+		return c.startApp(ctx)
+	}
+
+	if !c.HideHelp && HelpFlag != nil {
+		// append help to flags
+		c.appendFlag(HelpFlag)
+	}
+
+	if ctx.App.EnableShellCompletion {
+		c.appendFlag(GenerateCompletionFlag)
+	}
+
+	set, err := flagSet(c.Name, c.Flags)
+	if err != nil {
+		return err
+	}
+	set.SetOutput(ioutil.Discard)
+
+	if c.SkipFlagParsing {
+		err = set.Parse(append([]string{"--"}, ctx.Args().Tail()...))
+	} else {
+		err = set.Parse(ctx.Args().Tail())
+	}
+
+	nerr := normalizeFlags(c.Flags, set)
+	if nerr != nil {
+		fmt.Fprintln(ctx.App.Writer, nerr)
+		fmt.Fprintln(ctx.App.Writer)
+		ShowCommandHelp(ctx, c.Name)
+		return nerr
+	}
+
+	context := NewContext(ctx.App, set, ctx)
+	context.Command = c
+	if checkCommandCompletions(context, c.Name) {
+		return nil
+	}
+
+	if err != nil {
+		if c.OnUsageError != nil {
+			err := c.OnUsageError(context, err, false)
+			HandleExitCoder(err)
+			return err
+		}
+		fmt.Fprintln(context.App.Writer, "Incorrect Usage:", err.Error())
+		fmt.Fprintln(context.App.Writer)
+		ShowCommandHelp(context, c.Name)
+		return err
+	}
+
+	if checkCommandHelp(context, c.Name) {
+		return nil
+	}
+
+	if c.After != nil {
+		defer func() {
+			afterErr := c.After(context)
+			if afterErr != nil {
+				HandleExitCoder(err)
+				if err != nil {
+					err = newMultiError(err, afterErr)
+				} else {
+					err = afterErr
+				}
+			}
+		}()
+	}
+
+	if c.Before != nil {
+		err = c.Before(context)
+		if err != nil {
+			ShowCommandHelp(context, c.Name)
+			HandleExitCoder(err)
+			return err
+		}
+	}
+
+	if c.Action == nil {
+		c.Action = helpSubcommand.Action
+	}
+
+	context.Command = c
+	err = c.Action(context)
+
+	if err != nil {
+		HandleExitCoder(err)
+	}
+	return err
+}
+
+// Names returns the names including short names and aliases.
+func (c *Command) Names() []string {
+	return append([]string{c.Name}, c.Aliases...)
+}
+
+// HasName returns true if Command.Name matches given name
+func (c *Command) HasName(name string) bool {
+	for _, n := range c.Names() {
+		if n == name {
+			return true
+		}
+	}
+	return false
+}
+
+func (c *Command) startApp(ctx *Context) error {
+	app := &App{
+		Metadata: ctx.App.Metadata,
+		Name:     fmt.Sprintf("%s %s", ctx.App.Name, c.Name),
+	}
+
+	if c.HelpName == "" {
+		app.HelpName = c.HelpName
+	} else {
+		app.HelpName = app.Name
+	}
+
+	app.Usage = c.Usage
+	app.Description = c.Description
+	app.ArgsUsage = c.ArgsUsage
+
+	// set CommandNotFound
+	app.CommandNotFound = ctx.App.CommandNotFound
+	app.CustomAppHelpTemplate = c.CustomHelpTemplate
+
+	// set the flags and commands
+	app.Commands = c.Subcommands
+	app.Flags = c.Flags
+	app.HideHelp = c.HideHelp
+
+	app.Version = ctx.App.Version
+	app.HideVersion = ctx.App.HideVersion
+	app.Compiled = ctx.App.Compiled
+	app.Writer = ctx.App.Writer
+	app.ErrWriter = ctx.App.ErrWriter
+
+	app.Categories = newCommandCategories()
+	for _, command := range c.Subcommands {
+		app.Categories.AddCommand(command.Category, command)
+	}
+
+	sort.Sort(app.Categories.(*commandCategories))
+
+	// bash completion
+	app.EnableShellCompletion = ctx.App.EnableShellCompletion
+	if c.ShellComplete != nil {
+		app.ShellComplete = c.ShellComplete
+	}
+
+	// set the actions
+	app.Before = c.Before
+	app.After = c.After
+	if c.Action != nil {
+		app.Action = c.Action
+	} else {
+		app.Action = helpSubcommand.Action
+	}
+	app.OnUsageError = c.OnUsageError
+
+	for index, cc := range app.Commands {
+		app.Commands[index].commandNamePath = []string{c.Name, cc.Name}
+	}
+
+	return app.RunAsSubcommand(ctx)
+}
+
+// VisibleFlags returns a slice of the Flags with Hidden=false
+func (c *Command) VisibleFlags() []Flag {
+	return visibleFlags(c.Flags)
+}
+
+func (c *Command) appendFlag(fl Flag) {
+	if !hasFlag(c.Flags, fl) {
+		c.Flags = append(c.Flags, fl)
+	}
+}
+
+func hasCommand(commands []*Command, command *Command) bool {
+	for _, existing := range commands {
+		if command == existing {
+			return true
+		}
+	}
+
+	return false
+}