DockerCLI/vendor/github.com/spf13/cobra/command.go

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// Copyright © 2013 Steve Francia <spf@spf13.com>.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//Package cobra is a commander providing a simple interface to create powerful modern CLI interfaces.
//In addition to providing an interface, Cobra simultaneously provides a controller to organize your application code.
package cobra
import (
"bytes"
"fmt"
"io"
"os"
"path/filepath"
"sort"
"strings"
flag "github.com/spf13/pflag"
)
// Command is just that, a command for your application.
// eg. 'go run' ... 'run' is the command. Cobra requires
// you to define the usage and description as part of your command
// definition to ensure usability.
type Command struct {
// Name is the command name, usually the executable's name.
name string
// The one-line usage message.
Use string
// An array of aliases that can be used instead of the first word in Use.
Aliases []string
// An array of command names for which this command will be suggested - similar to aliases but only suggests.
SuggestFor []string
// The short description shown in the 'help' output.
Short string
// The long message shown in the 'help <this-command>' output.
Long string
// Examples of how to use the command
Example string
// List of all valid non-flag arguments that are accepted in bash completions
ValidArgs []string
// List of aliases for ValidArgs. These are not suggested to the user in the bash
// completion, but accepted if entered manually.
ArgAliases []string
// Expected arguments
Args PositionalArgs
// Custom functions used by the bash autocompletion generator
BashCompletionFunction string
// Is this command deprecated and should print this string when used?
Deprecated string
// Is this command hidden and should NOT show up in the list of available commands?
Hidden bool
// Tags are key/value pairs that can be used by applications to identify or
// group commands
Tags map[string]string
// Full set of flags
flags *flag.FlagSet
// Set of flags childrens of this command will inherit
pflags *flag.FlagSet
// Flags that are declared specifically by this command (not inherited).
lflags *flag.FlagSet
// SilenceErrors is an option to quiet errors down stream
SilenceErrors bool
// Silence Usage is an option to silence usage when an error occurs.
SilenceUsage bool
// The *Run functions are executed in the following order:
// * PersistentPreRun()
// * PreRun()
// * Run()
// * PostRun()
// * PersistentPostRun()
// All functions get the same args, the arguments after the command name
// PersistentPreRun: children of this command will inherit and execute
PersistentPreRun func(cmd *Command, args []string)
// PersistentPreRunE: PersistentPreRun but returns an error
PersistentPreRunE func(cmd *Command, args []string) error
// PreRun: children of this command will not inherit.
PreRun func(cmd *Command, args []string)
// PreRunE: PreRun but returns an error
PreRunE func(cmd *Command, args []string) error
// Run: Typically the actual work function. Most commands will only implement this
Run func(cmd *Command, args []string)
// RunE: Run but returns an error
RunE func(cmd *Command, args []string) error
// PostRun: run after the Run command.
PostRun func(cmd *Command, args []string)
// PostRunE: PostRun but returns an error
PostRunE func(cmd *Command, args []string) error
// PersistentPostRun: children of this command will inherit and execute after PostRun
PersistentPostRun func(cmd *Command, args []string)
// PersistentPostRunE: PersistentPostRun but returns an error
PersistentPostRunE func(cmd *Command, args []string) error
// DisableAutoGenTag remove
DisableAutoGenTag bool
// Commands is the list of commands supported by this program.
commands []*Command
// Parent Command for this command
parent *Command
// max lengths of commands' string lengths for use in padding
commandsMaxUseLen int
commandsMaxCommandPathLen int
commandsMaxNameLen int
// is commands slice are sorted or not
commandsAreSorted bool
flagErrorBuf *bytes.Buffer
args []string // actual args parsed from flags
output *io.Writer // nil means stderr; use Out() method instead
usageFunc func(*Command) error // Usage can be defined by application
usageTemplate string // Can be defined by Application
flagErrorFunc func(*Command, error) error
helpTemplate string // Can be defined by Application
helpFunc func(*Command, []string) // Help can be defined by application
helpCommand *Command // The help command
// The global normalization function that we can use on every pFlag set and children commands
globNormFunc func(f *flag.FlagSet, name string) flag.NormalizedName
// Disable the suggestions based on Levenshtein distance that go along with 'unknown command' messages
DisableSuggestions bool
// If displaying suggestions, allows to set the minimum levenshtein distance to display, must be > 0
SuggestionsMinimumDistance int
// Disable the flag parsing. If this is true all flags will be passed to the command as arguments.
DisableFlagParsing bool
// TraverseChildren parses flags on all parents before executing child command
TraverseChildren bool
}
// os.Args[1:] by default, if desired, can be overridden
// particularly useful when testing.
func (c *Command) SetArgs(a []string) {
c.args = a
}
func (c *Command) getOut(def io.Writer) io.Writer {
if c.output != nil {
return *c.output
}
if c.HasParent() {
return c.parent.Out()
}
return def
}
func (c *Command) Out() io.Writer {
return c.getOut(os.Stderr)
}
func (c *Command) getOutOrStdout() io.Writer {
return c.getOut(os.Stdout)
}
// SetOutput sets the destination for usage and error messages.
// If output is nil, os.Stderr is used.
func (c *Command) SetOutput(output io.Writer) {
c.output = &output
}
// Usage can be defined by application
func (c *Command) SetUsageFunc(f func(*Command) error) {
c.usageFunc = f
}
// Can be defined by Application
func (c *Command) SetUsageTemplate(s string) {
c.usageTemplate = s
}
// SetFlagErrorFunc sets a function to generate an error when flag parsing
// fails
func (c *Command) SetFlagErrorFunc(f func(*Command, error) error) {
c.flagErrorFunc = f
}
// Can be defined by Application
func (c *Command) SetHelpFunc(f func(*Command, []string)) {
c.helpFunc = f
}
func (c *Command) SetHelpCommand(cmd *Command) {
c.helpCommand = cmd
}
// Can be defined by Application
func (c *Command) SetHelpTemplate(s string) {
c.helpTemplate = s
}
// SetGlobalNormalizationFunc sets a normalization function to all flag sets and also to child commands.
// The user should not have a cyclic dependency on commands.
func (c *Command) SetGlobalNormalizationFunc(n func(f *flag.FlagSet, name string) flag.NormalizedName) {
c.Flags().SetNormalizeFunc(n)
c.PersistentFlags().SetNormalizeFunc(n)
c.globNormFunc = n
for _, command := range c.commands {
command.SetGlobalNormalizationFunc(n)
}
}
func (c *Command) UsageFunc() (f func(*Command) error) {
if c.usageFunc != nil {
return c.usageFunc
}
if c.HasParent() {
return c.parent.UsageFunc()
}
return func(c *Command) error {
err := tmpl(c.Out(), c.UsageTemplate(), c)
if err != nil {
fmt.Print(err)
}
return err
}
}
// HelpFunc returns either the function set by SetHelpFunc for this command
// or a parent, or it returns a function which calls c.Help()
func (c *Command) HelpFunc() func(*Command, []string) {
cmd := c
for cmd != nil {
if cmd.helpFunc != nil {
return cmd.helpFunc
}
cmd = cmd.parent
}
return func(*Command, []string) {
err := c.Help()
if err != nil {
c.Println(err)
}
}
}
// FlagErrorFunc returns either the function set by SetFlagErrorFunc for this
// command or a parent, or it returns a function which returns the original
// error.
func (c *Command) FlagErrorFunc() (f func(*Command, error) error) {
if c.flagErrorFunc != nil {
return c.flagErrorFunc
}
if c.HasParent() {
return c.parent.FlagErrorFunc()
}
return func(c *Command, err error) error {
return err
}
}
var minUsagePadding = 25
func (c *Command) UsagePadding() int {
if c.parent == nil || minUsagePadding > c.parent.commandsMaxUseLen {
return minUsagePadding
}
return c.parent.commandsMaxUseLen
}
var minCommandPathPadding = 11
//
func (c *Command) CommandPathPadding() int {
if c.parent == nil || minCommandPathPadding > c.parent.commandsMaxCommandPathLen {
return minCommandPathPadding
}
return c.parent.commandsMaxCommandPathLen
}
var minNamePadding = 11
func (c *Command) NamePadding() int {
if c.parent == nil || minNamePadding > c.parent.commandsMaxNameLen {
return minNamePadding
}
return c.parent.commandsMaxNameLen
}
func (c *Command) UsageTemplate() string {
if c.usageTemplate != "" {
return c.usageTemplate
}
if c.HasParent() {
return c.parent.UsageTemplate()
}
return `Usage:{{if .Runnable}}
{{if .HasAvailableFlags}}{{appendIfNotPresent .UseLine "[flags]"}}{{else}}{{.UseLine}}{{end}}{{end}}{{if .HasAvailableSubCommands}}
{{ .CommandPath}} [command]{{end}}{{if gt .Aliases 0}}
Aliases:
{{.NameAndAliases}}
{{end}}{{if .HasExample}}
Examples:
{{ .Example }}{{end}}{{ if .HasAvailableSubCommands}}
Available Commands:{{range .Commands}}{{if .IsAvailableCommand}}
{{rpad .Name .NamePadding }} {{.Short}}{{end}}{{end}}{{end}}{{ if .HasAvailableLocalFlags}}
Flags:
{{.LocalFlags.FlagUsages | trimRightSpace}}{{end}}{{ if .HasAvailableInheritedFlags}}
Global Flags:
{{.InheritedFlags.FlagUsages | trimRightSpace}}{{end}}{{if .HasHelpSubCommands}}
Additional help topics:{{range .Commands}}{{if .IsHelpCommand}}
{{rpad .CommandPath .CommandPathPadding}} {{.Short}}{{end}}{{end}}{{end}}{{ if .HasAvailableSubCommands }}
Use "{{.CommandPath}} [command] --help" for more information about a command.{{end}}
`
}
func (c *Command) HelpTemplate() string {
if c.helpTemplate != "" {
return c.helpTemplate
}
if c.HasParent() {
return c.parent.HelpTemplate()
}
return `{{with or .Long .Short }}{{. | trim}}
{{end}}{{if or .Runnable .HasSubCommands}}{{.UsageString}}{{end}}`
}
// Really only used when casting a command to a commander
func (c *Command) resetChildrensParents() {
for _, x := range c.commands {
x.parent = c
}
}
// Test if the named flag is a boolean flag.
func isBooleanFlag(name string, f *flag.FlagSet) bool {
flag := f.Lookup(name)
if flag == nil {
return false
}
return flag.Value.Type() == "bool"
}
// Test if the named flag is a boolean flag.
func isBooleanShortFlag(name string, f *flag.FlagSet) bool {
result := false
f.VisitAll(func(f *flag.Flag) {
if f.Shorthand == name && f.Value.Type() == "bool" {
result = true
}
})
return result
}
func stripFlags(args []string, c *Command) []string {
if len(args) < 1 {
return args
}
c.mergePersistentFlags()
commands := []string{}
inQuote := false
inFlag := false
for _, y := range args {
if !inQuote {
switch {
case strings.HasPrefix(y, "\""):
inQuote = true
case strings.Contains(y, "=\""):
inQuote = true
case strings.HasPrefix(y, "--") && !strings.Contains(y, "="):
// TODO: this isn't quite right, we should really check ahead for 'true' or 'false'
inFlag = !isBooleanFlag(y[2:], c.Flags())
case strings.HasPrefix(y, "-") && !strings.Contains(y, "=") && len(y) == 2 && !isBooleanShortFlag(y[1:], c.Flags()):
inFlag = true
case inFlag:
inFlag = false
case y == "":
// strip empty commands, as the go tests expect this to be ok....
case !strings.HasPrefix(y, "-"):
commands = append(commands, y)
inFlag = false
}
}
if strings.HasSuffix(y, "\"") && !strings.HasSuffix(y, "\\\"") {
inQuote = false
}
}
return commands
}
// argsMinusFirstX removes only the first x from args. Otherwise, commands that look like
// openshift admin policy add-role-to-user admin my-user, lose the admin argument (arg[4]).
func argsMinusFirstX(args []string, x string) []string {
for i, y := range args {
if x == y {
ret := []string{}
ret = append(ret, args[:i]...)
ret = append(ret, args[i+1:]...)
return ret
}
}
return args
}
func isFlagArg(arg string) bool {
return ((len(arg) >= 3 && arg[1] == '-') ||
(len(arg) >= 2 && arg[0] == '-' && arg[1] != '-'))
}
// Find the target command given the args and command tree
// Meant to be run on the highest node. Only searches down.
func (c *Command) Find(args []string) (*Command, []string, error) {
var innerfind func(*Command, []string) (*Command, []string)
innerfind = func(c *Command, innerArgs []string) (*Command, []string) {
argsWOflags := stripFlags(innerArgs, c)
if len(argsWOflags) == 0 {
return c, innerArgs
}
nextSubCmd := argsWOflags[0]
cmd := c.findNext(nextSubCmd)
if cmd != nil {
return innerfind(cmd, argsMinusFirstX(innerArgs, nextSubCmd))
}
return c, innerArgs
}
commandFound, a := innerfind(c, args)
if commandFound.Args == nil {
return commandFound, a, legacyArgs(commandFound, stripFlags(a, commandFound))
}
return commandFound, a, nil
}
func (c *Command) findNext(next string) *Command {
matches := make([]*Command, 0)
for _, cmd := range c.commands {
if cmd.Name() == next || cmd.HasAlias(next) {
return cmd
}
if EnablePrefixMatching && cmd.HasNameOrAliasPrefix(next) {
matches = append(matches, cmd)
}
}
if len(matches) == 1 {
return matches[0]
}
return nil
}
// Traverse the command tree to find the command, and parse args for
// each parent.
func (c *Command) Traverse(args []string) (*Command, []string, error) {
flags := []string{}
inFlag := false
for i, arg := range args {
switch {
// A long flag with a space separated value
case strings.HasPrefix(arg, "--") && !strings.Contains(arg, "="):
// TODO: this isn't quite right, we should really check ahead for 'true' or 'false'
inFlag = !isBooleanFlag(arg[2:], c.Flags())
flags = append(flags, arg)
continue
// A short flag with a space separated value
case strings.HasPrefix(arg, "-") && !strings.Contains(arg, "=") && len(arg) == 2 && !isBooleanShortFlag(arg[1:], c.Flags()):
inFlag = true
flags = append(flags, arg)
continue
// The value for a flag
case inFlag:
inFlag = false
flags = append(flags, arg)
continue
// A flag without a value, or with an `=` separated value
case isFlagArg(arg):
flags = append(flags, arg)
continue
}
cmd := c.findNext(arg)
if cmd == nil {
return c, args, nil
}
if err := c.ParseFlags(flags); err != nil {
return nil, args, err
}
return cmd.Traverse(args[i+1:])
}
return c, args, nil
}
func (c *Command) findSuggestions(arg string) string {
if c.DisableSuggestions {
return ""
}
if c.SuggestionsMinimumDistance <= 0 {
c.SuggestionsMinimumDistance = 2
}
suggestionsString := ""
if suggestions := c.SuggestionsFor(arg); len(suggestions) > 0 {
suggestionsString += "\n\nDid you mean this?\n"
for _, s := range suggestions {
suggestionsString += fmt.Sprintf("\t%v\n", s)
}
}
return suggestionsString
}
func (c *Command) SuggestionsFor(typedName string) []string {
suggestions := []string{}
for _, cmd := range c.commands {
if cmd.IsAvailableCommand() {
levenshteinDistance := ld(typedName, cmd.Name(), true)
suggestByLevenshtein := levenshteinDistance <= c.SuggestionsMinimumDistance
suggestByPrefix := strings.HasPrefix(strings.ToLower(cmd.Name()), strings.ToLower(typedName))
if suggestByLevenshtein || suggestByPrefix {
suggestions = append(suggestions, cmd.Name())
}
for _, explicitSuggestion := range cmd.SuggestFor {
if strings.EqualFold(typedName, explicitSuggestion) {
suggestions = append(suggestions, cmd.Name())
}
}
}
}
return suggestions
}
func (c *Command) VisitParents(fn func(*Command)) {
var traverse func(*Command) *Command
traverse = func(x *Command) *Command {
if x != c {
fn(x)
}
if x.HasParent() {
return traverse(x.parent)
}
return x
}
traverse(c)
}
func (c *Command) Root() *Command {
var findRoot func(*Command) *Command
findRoot = func(x *Command) *Command {
if x.HasParent() {
return findRoot(x.parent)
}
return x
}
return findRoot(c)
}
// ArgsLenAtDash will return the length of f.Args at the moment when a -- was
// found during arg parsing. This allows your program to know which args were
// before the -- and which came after. (Description from
// https://godoc.org/github.com/spf13/pflag#FlagSet.ArgsLenAtDash).
func (c *Command) ArgsLenAtDash() int {
return c.Flags().ArgsLenAtDash()
}
func (c *Command) execute(a []string) (err error) {
if c == nil {
return fmt.Errorf("Called Execute() on a nil Command")
}
if len(c.Deprecated) > 0 {
c.Printf("Command %q is deprecated, %s\n", c.Name(), c.Deprecated)
}
// initialize help flag as the last point possible to allow for user
// overriding
c.initHelpFlag()
err = c.ParseFlags(a)
if err != nil {
return c.FlagErrorFunc()(c, err)
}
// If help is called, regardless of other flags, return we want help
// Also say we need help if the command isn't runnable.
helpVal, err := c.Flags().GetBool("help")
if err != nil {
// should be impossible to get here as we always declare a help
// flag in initHelpFlag()
c.Println("\"help\" flag declared as non-bool. Please correct your code")
return err
}
if helpVal || !c.Runnable() {
return flag.ErrHelp
}
c.preRun()
argWoFlags := c.Flags().Args()
if c.DisableFlagParsing {
argWoFlags = a
}
if err := c.ValidateArgs(argWoFlags); err != nil {
return err
}
for p := c; p != nil; p = p.Parent() {
if p.PersistentPreRunE != nil {
if err := p.PersistentPreRunE(c, argWoFlags); err != nil {
return err
}
break
} else if p.PersistentPreRun != nil {
p.PersistentPreRun(c, argWoFlags)
break
}
}
if c.PreRunE != nil {
if err := c.PreRunE(c, argWoFlags); err != nil {
return err
}
} else if c.PreRun != nil {
c.PreRun(c, argWoFlags)
}
if c.RunE != nil {
if err := c.RunE(c, argWoFlags); err != nil {
return err
}
} else {
c.Run(c, argWoFlags)
}
if c.PostRunE != nil {
if err := c.PostRunE(c, argWoFlags); err != nil {
return err
}
} else if c.PostRun != nil {
c.PostRun(c, argWoFlags)
}
for p := c; p != nil; p = p.Parent() {
if p.PersistentPostRunE != nil {
if err := p.PersistentPostRunE(c, argWoFlags); err != nil {
return err
}
break
} else if p.PersistentPostRun != nil {
p.PersistentPostRun(c, argWoFlags)
break
}
}
return nil
}
func (c *Command) preRun() {
for _, x := range initializers {
x()
}
}
func (c *Command) errorMsgFromParse() string {
s := c.flagErrorBuf.String()
x := strings.Split(s, "\n")
if len(x) > 0 {
return x[0]
}
return ""
}
// Call execute to use the args (os.Args[1:] by default)
// and run through the command tree finding appropriate matches
// for commands and then corresponding flags.
func (c *Command) Execute() error {
_, err := c.ExecuteC()
return err
}
func (c *Command) ExecuteC() (cmd *Command, err error) {
// Regardless of what command execute is called on, run on Root only
if c.HasParent() {
return c.Root().ExecuteC()
}
// windows hook
if preExecHookFn != nil {
preExecHookFn(c)
}
// initialize help as the last point possible to allow for user
// overriding
c.initHelpCmd()
var args []string
// Workaround FAIL with "go test -v" or "cobra.test -test.v", see #155
if c.args == nil && filepath.Base(os.Args[0]) != "cobra.test" {
args = os.Args[1:]
} else {
args = c.args
}
var flags []string
if c.TraverseChildren {
cmd, flags, err = c.Traverse(args)
} else {
cmd, flags, err = c.Find(args)
}
if err != nil {
// If found parse to a subcommand and then failed, talk about the subcommand
if cmd != nil {
c = cmd
}
if !c.SilenceErrors {
c.Println("Error:", err.Error())
c.Printf("Run '%v --help' for usage.\n", c.CommandPath())
}
return c, err
}
err = cmd.execute(flags)
if err != nil {
// Always show help if requested, even if SilenceErrors is in
// effect
if err == flag.ErrHelp {
cmd.HelpFunc()(cmd, args)
return cmd, nil
}
// If root command has SilentErrors flagged,
// all subcommands should respect it
if !cmd.SilenceErrors && !c.SilenceErrors {
c.Println("Error:", err.Error())
}
// If root command has SilentUsage flagged,
// all subcommands should respect it
if !cmd.SilenceUsage && !c.SilenceUsage {
c.Println(cmd.UsageString())
}
return cmd, err
}
return cmd, nil
}
func (c *Command) ValidateArgs(args []string) error {
if c.Args == nil {
return nil
}
return c.Args(c, args)
}
func (c *Command) initHelpFlag() {
c.mergePersistentFlags()
if c.Flags().Lookup("help") == nil {
c.Flags().BoolP("help", "h", false, "help for "+c.Name())
}
}
func (c *Command) initHelpCmd() {
if c.helpCommand == nil {
if !c.HasSubCommands() {
return
}
c.helpCommand = &Command{
Use: "help [command]",
Short: "Help about any command",
Long: `Help provides help for any command in the application.
Simply type ` + c.Name() + ` help [path to command] for full details.`,
PersistentPreRun: func(cmd *Command, args []string) {},
PersistentPostRun: func(cmd *Command, args []string) {},
Run: func(c *Command, args []string) {
cmd, _, e := c.Root().Find(args)
if cmd == nil || e != nil {
c.Printf("Unknown help topic %#q.", args)
c.Root().Usage()
} else {
helpFunc := cmd.HelpFunc()
helpFunc(cmd, args)
}
},
}
}
c.AddCommand(c.helpCommand)
}
// Used for testing
func (c *Command) ResetCommands() {
c.commands = nil
c.helpCommand = nil
}
// Sorts commands by their names
type commandSorterByName []*Command
func (c commandSorterByName) Len() int { return len(c) }
func (c commandSorterByName) Swap(i, j int) { c[i], c[j] = c[j], c[i] }
func (c commandSorterByName) Less(i, j int) bool { return c[i].Name() < c[j].Name() }
// Commands returns a sorted slice of child commands.
func (c *Command) Commands() []*Command {
// do not sort commands if it already sorted or sorting was disabled
if EnableCommandSorting && !c.commandsAreSorted {
sort.Sort(commandSorterByName(c.commands))
c.commandsAreSorted = true
}
return c.commands
}
// AddCommand adds one or more commands to this parent command.
func (c *Command) AddCommand(cmds ...*Command) {
for i, x := range cmds {
if cmds[i] == c {
panic("Command can't be a child of itself")
}
cmds[i].parent = c
// update max lengths
usageLen := len(x.Use)
if usageLen > c.commandsMaxUseLen {
c.commandsMaxUseLen = usageLen
}
commandPathLen := len(x.CommandPath())
if commandPathLen > c.commandsMaxCommandPathLen {
c.commandsMaxCommandPathLen = commandPathLen
}
nameLen := len(x.Name())
if nameLen > c.commandsMaxNameLen {
c.commandsMaxNameLen = nameLen
}
// If global normalization function exists, update all children
if c.globNormFunc != nil {
x.SetGlobalNormalizationFunc(c.globNormFunc)
}
c.commands = append(c.commands, x)
c.commandsAreSorted = false
}
}
// RemoveCommand removes one or more commands from a parent command.
func (c *Command) RemoveCommand(cmds ...*Command) {
commands := []*Command{}
main:
for _, command := range c.commands {
for _, cmd := range cmds {
if command == cmd {
command.parent = nil
continue main
}
}
commands = append(commands, command)
}
c.commands = commands
// recompute all lengths
c.commandsMaxUseLen = 0
c.commandsMaxCommandPathLen = 0
c.commandsMaxNameLen = 0
for _, command := range c.commands {
usageLen := len(command.Use)
if usageLen > c.commandsMaxUseLen {
c.commandsMaxUseLen = usageLen
}
commandPathLen := len(command.CommandPath())
if commandPathLen > c.commandsMaxCommandPathLen {
c.commandsMaxCommandPathLen = commandPathLen
}
nameLen := len(command.Name())
if nameLen > c.commandsMaxNameLen {
c.commandsMaxNameLen = nameLen
}
}
}
// Print is a convenience method to Print to the defined output
func (c *Command) Print(i ...interface{}) {
fmt.Fprint(c.Out(), i...)
}
// Println is a convenience method to Println to the defined output
func (c *Command) Println(i ...interface{}) {
str := fmt.Sprintln(i...)
c.Print(str)
}
// Printf is a convenience method to Printf to the defined output
func (c *Command) Printf(format string, i ...interface{}) {
str := fmt.Sprintf(format, i...)
c.Print(str)
}
// Output the usage for the command
// Used when a user provides invalid input
// Can be defined by user by overriding UsageFunc
func (c *Command) Usage() error {
c.mergePersistentFlags()
err := c.UsageFunc()(c)
return err
}
// Output the help for the command
// Used when a user calls help [command]
// by the default HelpFunc in the commander
func (c *Command) Help() error {
c.mergePersistentFlags()
err := tmpl(c.getOutOrStdout(), c.HelpTemplate(), c)
return err
}
func (c *Command) UsageString() string {
tmpOutput := c.output
bb := new(bytes.Buffer)
c.SetOutput(bb)
c.Usage()
c.output = tmpOutput
return bb.String()
}
// CommandPath returns the full path to this command.
func (c *Command) CommandPath() string {
str := c.Name()
x := c
for x.HasParent() {
str = x.parent.Name() + " " + str
x = x.parent
}
return str
}
//The full usage for a given command (including parents)
func (c *Command) UseLine() string {
str := ""
if c.HasParent() {
str = c.parent.CommandPath() + " "
}
return str + c.Use
}
// For use in determining which flags have been assigned to which commands
// and which persist
func (c *Command) DebugFlags() {
c.Println("DebugFlags called on", c.Name())
var debugflags func(*Command)
debugflags = func(x *Command) {
if x.HasFlags() || x.HasPersistentFlags() {
c.Println(x.Name())
}
if x.HasFlags() {
x.flags.VisitAll(func(f *flag.Flag) {
if x.HasPersistentFlags() {
if x.persistentFlag(f.Name) == nil {
c.Println(" -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, " [L]")
} else {
c.Println(" -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, " [LP]")
}
} else {
c.Println(" -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, " [L]")
}
})
}
if x.HasPersistentFlags() {
x.pflags.VisitAll(func(f *flag.Flag) {
if x.HasFlags() {
if x.flags.Lookup(f.Name) == nil {
c.Println(" -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, " [P]")
}
} else {
c.Println(" -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, " [P]")
}
})
}
c.Println(x.flagErrorBuf)
if x.HasSubCommands() {
for _, y := range x.commands {
debugflags(y)
}
}
}
debugflags(c)
}
// Name returns the command's name: the first word in the use line.
func (c *Command) Name() string {
if c.name != "" {
return c.name
}
name := c.Use
i := strings.Index(name, " ")
if i >= 0 {
name = name[:i]
}
return name
}
// HasAlias determines if a given string is an alias of the command.
func (c *Command) HasAlias(s string) bool {
for _, a := range c.Aliases {
if a == s {
return true
}
}
return false
}
// HasNameOrAliasPrefix returns true if the Name or any of aliases start
// with prefix
func (c *Command) HasNameOrAliasPrefix(prefix string) bool {
if strings.HasPrefix(c.Name(), prefix) {
return true
}
for _, alias := range c.Aliases {
if strings.HasPrefix(alias, prefix) {
return true
}
}
return false
}
func (c *Command) NameAndAliases() string {
return strings.Join(append([]string{c.Name()}, c.Aliases...), ", ")
}
func (c *Command) HasExample() bool {
return len(c.Example) > 0
}
// Runnable determines if the command is itself runnable
func (c *Command) Runnable() bool {
return c.Run != nil || c.RunE != nil
}
// HasSubCommands determines if the command has children commands
func (c *Command) HasSubCommands() bool {
return len(c.commands) > 0
}
// IsAvailableCommand determines if a command is available as a non-help command
// (this includes all non deprecated/hidden commands)
func (c *Command) IsAvailableCommand() bool {
if len(c.Deprecated) != 0 || c.Hidden {
return false
}
if c.HasParent() && c.Parent().helpCommand == c {
return false
}
if c.Runnable() || c.HasAvailableSubCommands() {
return true
}
return false
}
// IsHelpCommand determines if a command is a 'help' command; a help command is
// determined by the fact that it is NOT runnable/hidden/deprecated, and has no
// sub commands that are runnable/hidden/deprecated
func (c *Command) IsHelpCommand() bool {
// if a command is runnable, deprecated, or hidden it is not a 'help' command
if c.Runnable() || len(c.Deprecated) != 0 || c.Hidden {
return false
}
// if any non-help sub commands are found, the command is not a 'help' command
for _, sub := range c.commands {
if !sub.IsHelpCommand() {
return false
}
}
// the command either has no sub commands, or no non-help sub commands
return true
}
// HasHelpSubCommands determines if a command has any avilable 'help' sub commands
// that need to be shown in the usage/help default template under 'additional help
// topics'
func (c *Command) HasHelpSubCommands() bool {
// return true on the first found available 'help' sub command
for _, sub := range c.commands {
if sub.IsHelpCommand() {
return true
}
}
// the command either has no sub commands, or no available 'help' sub commands
return false
}
// HasAvailableSubCommands determines if a command has available sub commands that
// need to be shown in the usage/help default template under 'available commands'
func (c *Command) HasAvailableSubCommands() bool {
// return true on the first found available (non deprecated/help/hidden)
// sub command
for _, sub := range c.commands {
if sub.IsAvailableCommand() {
return true
}
}
// the command either has no sub comamnds, or no available (non deprecated/help/hidden)
// sub commands
return false
}
// Determine if the command is a child command
func (c *Command) HasParent() bool {
return c.parent != nil
}
// GlobalNormalizationFunc returns the global normalization function or nil if doesn't exists
func (c *Command) GlobalNormalizationFunc() func(f *flag.FlagSet, name string) flag.NormalizedName {
return c.globNormFunc
}
// Get the complete FlagSet that applies to this command (local and persistent declared here and by all parents)
func (c *Command) Flags() *flag.FlagSet {
if c.flags == nil {
c.flags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
if c.flagErrorBuf == nil {
c.flagErrorBuf = new(bytes.Buffer)
}
c.flags.SetOutput(c.flagErrorBuf)
}
return c.flags
}
// LocalNonPersistentFlags are flags specific to this command which will NOT persist to subcommands
func (c *Command) LocalNonPersistentFlags() *flag.FlagSet {
persistentFlags := c.PersistentFlags()
out := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
c.LocalFlags().VisitAll(func(f *flag.Flag) {
if persistentFlags.Lookup(f.Name) == nil {
out.AddFlag(f)
}
})
return out
}
// Get the local FlagSet specifically set in the current command
func (c *Command) LocalFlags() *flag.FlagSet {
c.mergePersistentFlags()
local := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
c.lflags.VisitAll(func(f *flag.Flag) {
local.AddFlag(f)
})
if !c.HasParent() {
flag.CommandLine.VisitAll(func(f *flag.Flag) {
if local.Lookup(f.Name) == nil {
local.AddFlag(f)
}
})
}
return local
}
// All Flags which were inherited from parents commands
func (c *Command) InheritedFlags() *flag.FlagSet {
c.mergePersistentFlags()
inherited := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
local := c.LocalFlags()
var rmerge func(x *Command)
rmerge = func(x *Command) {
if x.HasPersistentFlags() {
x.PersistentFlags().VisitAll(func(f *flag.Flag) {
if inherited.Lookup(f.Name) == nil && local.Lookup(f.Name) == nil {
inherited.AddFlag(f)
}
})
}
if x.HasParent() {
rmerge(x.parent)
}
}
if c.HasParent() {
rmerge(c.parent)
}
return inherited
}
// All Flags which were not inherited from parent commands
func (c *Command) NonInheritedFlags() *flag.FlagSet {
return c.LocalFlags()
}
// Get the Persistent FlagSet specifically set in the current command
func (c *Command) PersistentFlags() *flag.FlagSet {
if c.pflags == nil {
c.pflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
if c.flagErrorBuf == nil {
c.flagErrorBuf = new(bytes.Buffer)
}
c.pflags.SetOutput(c.flagErrorBuf)
}
return c.pflags
}
// For use in testing
func (c *Command) ResetFlags() {
c.flagErrorBuf = new(bytes.Buffer)
c.flagErrorBuf.Reset()
c.flags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
c.flags.SetOutput(c.flagErrorBuf)
c.pflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
c.pflags.SetOutput(c.flagErrorBuf)
}
// Does the command contain any flags (local plus persistent from the entire structure)
func (c *Command) HasFlags() bool {
return c.Flags().HasFlags()
}
// Does the command contain persistent flags
func (c *Command) HasPersistentFlags() bool {
return c.PersistentFlags().HasFlags()
}
// Does the command has flags specifically declared locally
func (c *Command) HasLocalFlags() bool {
return c.LocalFlags().HasFlags()
}
// Does the command have flags inherited from its parent command
func (c *Command) HasInheritedFlags() bool {
return c.InheritedFlags().HasFlags()
}
// Does the command contain any flags (local plus persistent from the entire
// structure) which are not hidden or deprecated
func (c *Command) HasAvailableFlags() bool {
return c.Flags().HasAvailableFlags()
}
// Does the command contain persistent flags which are not hidden or deprecated
func (c *Command) HasAvailablePersistentFlags() bool {
return c.PersistentFlags().HasAvailableFlags()
}
// Does the command has flags specifically declared locally which are not hidden
// or deprecated
func (c *Command) HasAvailableLocalFlags() bool {
return c.LocalFlags().HasAvailableFlags()
}
// Does the command have flags inherited from its parent command which are
// not hidden or deprecated
func (c *Command) HasAvailableInheritedFlags() bool {
return c.InheritedFlags().HasAvailableFlags()
}
// Flag climbs up the command tree looking for matching flag
func (c *Command) Flag(name string) (flag *flag.Flag) {
flag = c.Flags().Lookup(name)
if flag == nil {
flag = c.persistentFlag(name)
}
return
}
// recursively find matching persistent flag
func (c *Command) persistentFlag(name string) (flag *flag.Flag) {
if c.HasPersistentFlags() {
flag = c.PersistentFlags().Lookup(name)
}
if flag == nil && c.HasParent() {
flag = c.parent.persistentFlag(name)
}
return
}
// ParseFlags parses persistent flag tree & local flags
func (c *Command) ParseFlags(args []string) (err error) {
if c.DisableFlagParsing {
return nil
}
c.mergePersistentFlags()
err = c.Flags().Parse(args)
return
}
// Parent returns a commands parent command
func (c *Command) Parent() *Command {
return c.parent
}
func (c *Command) mergePersistentFlags() {
var rmerge func(x *Command)
// Save the set of local flags
if c.lflags == nil {
c.lflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
if c.flagErrorBuf == nil {
c.flagErrorBuf = new(bytes.Buffer)
}
c.lflags.SetOutput(c.flagErrorBuf)
addtolocal := func(f *flag.Flag) {
c.lflags.AddFlag(f)
}
c.Flags().VisitAll(addtolocal)
c.PersistentFlags().VisitAll(addtolocal)
}
rmerge = func(x *Command) {
if !x.HasParent() {
flag.CommandLine.VisitAll(func(f *flag.Flag) {
if x.PersistentFlags().Lookup(f.Name) == nil {
x.PersistentFlags().AddFlag(f)
}
})
}
if x.HasPersistentFlags() {
x.PersistentFlags().VisitAll(func(f *flag.Flag) {
if c.Flags().Lookup(f.Name) == nil {
c.Flags().AddFlag(f)
}
})
}
if x.HasParent() {
rmerge(x.parent)
}
}
rmerge(c)
}