cobra

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Published: Sep 27, 2020 License: Apache-2.0, Apache-2.0 Imports: 14 Imported by: 0

Documentation

Overview

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.

Index

Constants

View Source
const (
	BashCompFilenameExt     = "cobra_annotation_bash_completion_filename_extensions"
	BashCompCustom          = "cobra_annotation_bash_completion_custom"
	BashCompOneRequiredFlag = "cobra_annotation_bash_completion_one_required_flag"
	BashCompSubdirsInDir    = "cobra_annotation_bash_completion_subdirs_in_dir"
)

Annotations for Bash completion.

Variables

View Source
var EnableCommandSorting = true

EnableCommandSorting controls sorting of the slice of commands, which is turned on by default. To disable sorting, set it to false.

View Source
var EnablePrefixMatching = false

EnablePrefixMatching allows to set automatic prefix matching. Automatic prefix matching can be a dangerous thing to automatically enable in CLI tools. Set this to true to enable it.

View Source
var MousetrapDisplayDuration time.Duration = 5 * time.Second

MousetrapDisplayDuration controls how long the MousetrapHelpText message is displayed on Windows if the CLI is started from explorer.exe. Set to 0 to wait for the return key to be pressed. To disable the mousetrap, just set MousetrapHelpText to blank string (""). Works only on Microsoft Windows.

View Source
var MousetrapHelpText string = `This is a command line tool.

You need to open cmd.exe and run it from there.
`

MousetrapHelpText enables an information splash screen on Windows if the CLI is started from explorer.exe. To disable the mousetrap, just set this variable to blank string (""). Works only on Microsoft Windows.

Functions

func AddTemplateFunc

func AddTemplateFunc(name string, tmplFunc interface{})

AddTemplateFunc adds a template function that's available to Usage and Help template generation.

func AddTemplateFuncs

func AddTemplateFuncs(tmplFuncs template.FuncMap)

AddTemplateFuncs adds multiple template functions that are available to Usage and Help template generation.

func ArbitraryArgs

func ArbitraryArgs(cmd *Command, args []string) error

ArbitraryArgs never returns an error.

func Eq

func Eq(a interface{}, b interface{}) bool

Eq takes two types and checks whether they are equal. Supported types are int and string. Unsupported types will panic.

func Gt

func Gt(a interface{}, b interface{}) bool

Gt takes two types and checks whether the first type is greater than the second. In case of types Arrays, Chans, Maps and Slices, Gt will compare their lengths. Ints are compared directly while strings are first parsed as ints and then compared.

func MarkFlagCustom

func MarkFlagCustom(flags *pflag.FlagSet, name string, f string) error

MarkFlagCustom instructs the various shell completion implementations to limit completions for this flag to the specified extensions (patterns).

Shell Completion compatibility matrix: bash, zsh

func MarkFlagDirname

func MarkFlagDirname(flags *pflag.FlagSet, name string) error

MarkFlagDirname instructs the various shell completion implementations to complete only directories with this specified flag.

Shell Completion compatibility matrix: zsh

func MarkFlagFilename

func MarkFlagFilename(flags *pflag.FlagSet, name string, extensions ...string) error

MarkFlagFilename instructs the various shell completion implementations to limit completions for this flag to the specified extensions (patterns).

Shell Completion compatibility matrix: bash, zsh

func MarkFlagRequired

func MarkFlagRequired(flags *pflag.FlagSet, name string) error

MarkFlagRequired adds the BashCompOneRequiredFlag annotation to the named flag if it exists, and causes your command to report an error if invoked without the flag.

func NoArgs

func NoArgs(cmd *Command, args []string) error

NoArgs returns an error if any args are included.

func OnInitialize

func OnInitialize(y ...func())

OnInitialize sets the passed functions to be run when each command's Execute method is called.

func OnlyValidArgs

func OnlyValidArgs(cmd *Command, args []string) error

OnlyValidArgs returns an error if any args are not in the list of ValidArgs.

Types

type Command

type Command struct {
	// Use is the one-line usage message.
	Use string

	// Aliases is an array of aliases that can be used instead of the first word in Use.
	Aliases []string

	// SuggestFor is an array of command names for which this command will be suggested -
	// similar to aliases but only suggests.
	SuggestFor []string

	// Short is the short description shown in the 'help' output.
	Short string

	// Long is the long message shown in the 'help <this-command>' output.
	Long string

	// Example is examples of how to use the command.
	Example string

	// ValidArgs is list of all valid non-flag arguments that are accepted in bash completions
	ValidArgs []string

	// Expected arguments
	Args PositionalArgs

	// ArgAliases is List of aliases for ValidArgs.
	// These are not suggested to the user in the bash completion,
	// but accepted if entered manually.
	ArgAliases []string

	// BashCompletionFunction is custom functions used by the bash autocompletion generator.
	BashCompletionFunction string

	// Deprecated defines, if this command is deprecated and should print this string when used.
	Deprecated string

	// Hidden defines, if this command is hidden and should NOT show up in the list of available commands.
	Hidden bool

	// Annotations are key/value pairs that can be used by applications to identify or
	// group commands.
	Annotations map[string]string

	// Version defines the version for this command. If this value is non-empty and the command does not
	// define a "version" flag, a "version" boolean flag will be added to the command and, if specified,
	// will print content of the "Version" variable.
	Version string

	// 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

	// SilenceErrors is an option to quiet errors down stream.
	SilenceErrors bool

	// SilenceUsage is an option to silence usage when an error occurs.
	SilenceUsage bool

	// DisableFlagParsing disables the flag parsing.
	// If this is true all flags will be passed to the command as arguments.
	DisableFlagParsing bool

	// DisableAutoGenTag defines, if gen tag ("Auto generated by spf13/cobra...")
	// will be printed by generating docs for this command.
	DisableAutoGenTag bool

	// DisableFlagsInUseLine will disable the addition of [flags] to the usage
	// line of a command when printing help or generating docs
	DisableFlagsInUseLine bool

	// DisableSuggestions disables the suggestions based on Levenshtein distance
	// that go along with 'unknown command' messages.
	DisableSuggestions bool
	// SuggestionsMinimumDistance defines minimum levenshtein distance to display suggestions.
	// Must be > 0.
	SuggestionsMinimumDistance int

	// TraverseChildren parses flags on all parents before executing child command.
	TraverseChildren bool

	//FParseErrWhitelist flag parse errors to be ignored
	FParseErrWhitelist FParseErrWhitelist
	// contains filtered or unexported fields
}

Command is just that, a command for your application. E.g. 'go run ...' - 'run' is the command. Cobra requires you to define the usage and description as part of your command definition to ensure usability.

func (*Command) AddCommand

func (c *Command) AddCommand(cmds ...*Command)

AddCommand adds one or more commands to this parent command.

func (*Command) ArgsLenAtDash

func (c *Command) ArgsLenAtDash() int

ArgsLenAtDash will return the length of c.Flags().Args at the moment when a -- was found during args parsing.

func (*Command) CalledAs

func (c *Command) CalledAs() string

CalledAs returns the command name or alias that was used to invoke this command or an empty string if the command has not been called.

func (*Command) CommandPath

func (c *Command) CommandPath() string

CommandPath returns the full path to this command.

func (*Command) CommandPathPadding

func (c *Command) CommandPathPadding() int

CommandPathPadding return padding for the command path.

func (*Command) Commands

func (c *Command) Commands() []*Command

Commands returns a sorted slice of child commands.

func (*Command) DebugFlags

func (c *Command) DebugFlags()

DebugFlags used to determine which flags have been assigned to which commands and which persist.

func (*Command) ErrOrStderr

func (c *Command) ErrOrStderr() io.Writer

ErrOrStderr returns output to stderr

func (*Command) Execute

func (c *Command) Execute() error

Execute uses the args (os.Args[1:] by default) and run through the command tree finding appropriate matches for commands and then corresponding flags.

func (*Command) ExecuteC

func (c *Command) ExecuteC() (cmd *Command, err error)

ExecuteC executes the command.

func (*Command) Find

func (c *Command) Find(args []string) (*Command, []string, error)

Find the target command given the args and command tree Meant to be run on the highest node. Only searches down.

func (*Command) Flag

func (c *Command) Flag(name string) (flag *flag.Flag)

Flag climbs up the command tree looking for matching flag.

func (*Command) FlagErrorFunc

func (c *Command) FlagErrorFunc() (f func(*Command, error) error)

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 (*Command) Flags

func (c *Command) Flags() *flag.FlagSet

Flags returns the complete FlagSet that applies to this command (local and persistent declared here and by all parents).

func (*Command) GenBashCompletion

func (c *Command) GenBashCompletion(w io.Writer) error

GenBashCompletion generates bash completion file and writes to the passed writer.

func (*Command) GenBashCompletionFile

func (c *Command) GenBashCompletionFile(filename string) error

GenBashCompletionFile generates bash completion file.

func (*Command) GenPowerShellCompletion

func (c *Command) GenPowerShellCompletion(w io.Writer) error

GenPowerShellCompletion generates PowerShell completion file and writes to the passed writer.

func (*Command) GenPowerShellCompletionFile

func (c *Command) GenPowerShellCompletionFile(filename string) error

GenPowerShellCompletionFile generates PowerShell completion file.

func (*Command) GenZshCompletion

func (c *Command) GenZshCompletion(w io.Writer) error

GenZshCompletion generates a zsh completion file and writes to the passed writer. The completion always run on the root command regardless of the command it was called from.

func (*Command) GenZshCompletionFile

func (c *Command) GenZshCompletionFile(filename string) error

GenZshCompletionFile generates zsh completion file.

func (*Command) GlobalNormalizationFunc

func (c *Command) GlobalNormalizationFunc() func(f *flag.FlagSet, name string) flag.NormalizedName

GlobalNormalizationFunc returns the global normalization function or nil if it doesn't exist.

func (*Command) HasAlias

func (c *Command) HasAlias(s string) bool

HasAlias determines if a given string is an alias of the command.

func (*Command) HasAvailableFlags

func (c *Command) HasAvailableFlags() bool

HasAvailableFlags checks if the command contains any flags (local plus persistent from the entire structure) which are not hidden or deprecated.

func (*Command) HasAvailableInheritedFlags

func (c *Command) HasAvailableInheritedFlags() bool

HasAvailableInheritedFlags checks if the command has flags inherited from its parent command which are not hidden or deprecated.

func (*Command) HasAvailableLocalFlags

func (c *Command) HasAvailableLocalFlags() bool

HasAvailableLocalFlags checks if the command has flags specifically declared locally which are not hidden or deprecated.

func (*Command) HasAvailablePersistentFlags

func (c *Command) HasAvailablePersistentFlags() bool

HasAvailablePersistentFlags checks if the command contains persistent flags which are not hidden or deprecated.

func (*Command) HasAvailableSubCommands

func (c *Command) HasAvailableSubCommands() bool

HasAvailableSubCommands determines if a command has available sub commands that need to be shown in the usage/help default template under 'available commands'.

func (*Command) HasExample

func (c *Command) HasExample() bool

HasExample determines if the command has example.

func (*Command) HasFlags

func (c *Command) HasFlags() bool

HasFlags checks if the command contains any flags (local plus persistent from the entire structure).

func (*Command) HasHelpSubCommands

func (c *Command) HasHelpSubCommands() bool

HasHelpSubCommands determines if a command has any available 'help' sub commands that need to be shown in the usage/help default template under 'additional help topics'.

func (*Command) HasInheritedFlags

func (c *Command) HasInheritedFlags() bool

HasInheritedFlags checks if the command has flags inherited from its parent command.

func (*Command) HasLocalFlags

func (c *Command) HasLocalFlags() bool

HasLocalFlags checks if the command has flags specifically declared locally.

func (*Command) HasParent

func (c *Command) HasParent() bool

HasParent determines if the command is a child command.

func (*Command) HasPersistentFlags

func (c *Command) HasPersistentFlags() bool

HasPersistentFlags checks if the command contains persistent flags.

func (*Command) HasSubCommands

func (c *Command) HasSubCommands() bool

HasSubCommands determines if the command has children commands.

func (*Command) Help

func (c *Command) Help() error

Help puts out the help for the command. Used when a user calls help [command]. Can be defined by user by overriding HelpFunc.

func (*Command) HelpFunc

func (c *Command) HelpFunc() func(*Command, []string)

HelpFunc returns either the function set by SetHelpFunc for this command or a parent, or it returns a function with default help behavior.

func (*Command) HelpTemplate

func (c *Command) HelpTemplate() string

HelpTemplate return help template for the command.

func (*Command) InOrStdin

func (c *Command) InOrStdin() io.Reader

ErrOrStderr returns output to stderr

func (*Command) InheritedFlags

func (c *Command) InheritedFlags() *flag.FlagSet

InheritedFlags returns all flags which were inherited from parent commands.

func (*Command) InitDefaultHelpCmd

func (c *Command) InitDefaultHelpCmd()

InitDefaultHelpCmd adds default help command to c. It is called automatically by executing the c or by calling help and usage. If c already has help command or c has no subcommands, it will do nothing.

func (*Command) InitDefaultHelpFlag

func (c *Command) InitDefaultHelpFlag()

InitDefaultHelpFlag adds default help flag to c. It is called automatically by executing the c or by calling help and usage. If c already has help flag, it will do nothing.

func (*Command) InitDefaultVersionFlag

func (c *Command) InitDefaultVersionFlag()

InitDefaultVersionFlag adds default version flag to c. It is called automatically by executing the c. If c already has a version flag, it will do nothing. If c.Version is empty, it will do nothing.

func (*Command) IsAdditionalHelpTopicCommand

func (c *Command) IsAdditionalHelpTopicCommand() bool

IsAdditionalHelpTopicCommand determines if a command is an additional help topic command; additional help topic command is determined by the fact that it is NOT runnable/hidden/deprecated, and has no sub commands that are runnable/hidden/deprecated. Concrete example: https://github.com/wingbaas/platformsrv/settings/fabric/txgeneratev2/spf13/cobra/issues/393#issuecomment-282741924.

func (*Command) IsAvailableCommand

func (c *Command) IsAvailableCommand() bool

IsAvailableCommand determines if a command is available as a non-help command (this includes all non deprecated/hidden commands).

func (*Command) LocalFlags

func (c *Command) LocalFlags() *flag.FlagSet

LocalFlags returns the local FlagSet specifically set in the current command.

func (*Command) LocalNonPersistentFlags

func (c *Command) LocalNonPersistentFlags() *flag.FlagSet

LocalNonPersistentFlags are flags specific to this command which will NOT persist to subcommands.

func (*Command) MarkFlagCustom

func (c *Command) MarkFlagCustom(name string, f string) error

MarkFlagCustom adds the BashCompCustom annotation to the named flag, if it exists. Generated bash autocompletion will call the bash function f for the flag.

func (*Command) MarkFlagDirname

func (c *Command) MarkFlagDirname(name string) error

MarkFlagDirname instructs the various shell completion implementations to complete only directories with this named flag.

Shell Completion compatibility matrix: zsh

func (*Command) MarkFlagFilename

func (c *Command) MarkFlagFilename(name string, extensions ...string) error

MarkFlagFilename adds the BashCompFilenameExt annotation to the named flag, if it exists. Generated bash autocompletion will select filenames for the flag, limiting to named extensions if provided.

func (*Command) MarkFlagRequired

func (c *Command) MarkFlagRequired(name string) error

MarkFlagRequired adds the BashCompOneRequiredFlag annotation to the named flag if it exists, and causes your command to report an error if invoked without the flag.

func (*Command) MarkPersistentFlagDirname

func (c *Command) MarkPersistentFlagDirname(name string) error

MarkPersistentFlagDirname instructs the various shell completion implementations to complete only directories with this persistent named flag.

Shell Completion compatibility matrix: zsh

func (*Command) MarkPersistentFlagFilename

func (c *Command) MarkPersistentFlagFilename(name string, extensions ...string) error

MarkPersistentFlagFilename instructs the various shell completion implementations to limit completions for this persistent flag to the specified extensions (patterns).

Shell Completion compatibility matrix: bash, zsh

func (*Command) MarkPersistentFlagRequired

func (c *Command) MarkPersistentFlagRequired(name string) error

MarkPersistentFlagRequired adds the BashCompOneRequiredFlag annotation to the named persistent flag if it exists, and causes your command to report an error if invoked without the flag.

func (*Command) MarkZshCompPositionalArgumentFile

func (c *Command) MarkZshCompPositionalArgumentFile(argPosition int, patterns ...string) error

MarkZshCompPositionalArgumentFile marks the specified argument (first argument is 1) as completed by file selection. patterns (e.g. "*.txt") are optional - if not provided the completion will search for all files.

func (*Command) MarkZshCompPositionalArgumentWords

func (c *Command) MarkZshCompPositionalArgumentWords(argPosition int, words ...string) error

MarkZshCompPositionalArgumentWords marks the specified positional argument (first argument is 1) as completed by the provided words. At east one word must be provided, spaces within words will be offered completion with "word\ word".

func (*Command) Name

func (c *Command) Name() string

Name returns the command's name: the first word in the use line.

func (*Command) NameAndAliases

func (c *Command) NameAndAliases() string

NameAndAliases returns a list of the command name and all aliases

func (*Command) NamePadding

func (c *Command) NamePadding() int

NamePadding returns padding for the name.

func (*Command) NonInheritedFlags

func (c *Command) NonInheritedFlags() *flag.FlagSet

NonInheritedFlags returns all flags which were not inherited from parent commands.

func (*Command) OutOrStderr

func (c *Command) OutOrStderr() io.Writer

OutOrStderr returns output to stderr

func (*Command) OutOrStdout

func (c *Command) OutOrStdout() io.Writer

OutOrStdout returns output to stdout.

func (*Command) Parent

func (c *Command) Parent() *Command

Parent returns a commands parent command.

func (*Command) ParseFlags

func (c *Command) ParseFlags(args []string) error

ParseFlags parses persistent flag tree and local flags.

func (*Command) PersistentFlags

func (c *Command) PersistentFlags() *flag.FlagSet

PersistentFlags returns the persistent FlagSet specifically set in the current command.

func (*Command) Print

func (c *Command) Print(i ...interface{})

Print is a convenience method to Print to the defined output, fallback to Stderr if not set.

func (*Command) PrintErr

func (c *Command) PrintErr(i ...interface{})

PrintErr is a convenience method to Print to the defined Err output, fallback to Stderr if not set.

func (*Command) PrintErrf

func (c *Command) PrintErrf(format string, i ...interface{})

PrintErrf is a convenience method to Printf to the defined Err output, fallback to Stderr if not set.

func (*Command) PrintErrln

func (c *Command) PrintErrln(i ...interface{})

PrintErrln is a convenience method to Println to the defined Err output, fallback to Stderr if not set.

func (*Command) Printf

func (c *Command) Printf(format string, i ...interface{})

Printf is a convenience method to Printf to the defined output, fallback to Stderr if not set.

func (*Command) Println

func (c *Command) Println(i ...interface{})

Println is a convenience method to Println to the defined output, fallback to Stderr if not set.

func (*Command) RemoveCommand

func (c *Command) RemoveCommand(cmds ...*Command)

RemoveCommand removes one or more commands from a parent command.

func (*Command) ResetCommands

func (c *Command) ResetCommands()

ResetCommands delete parent, subcommand and help command from c.

func (*Command) ResetFlags

func (c *Command) ResetFlags()

ResetFlags deletes all flags from command.

func (*Command) Root

func (c *Command) Root() *Command

Root finds root command.

func (*Command) Runnable

func (c *Command) Runnable() bool

Runnable determines if the command is itself runnable.

func (*Command) SetArgs

func (c *Command) SetArgs(a []string)

SetArgs sets arguments for the command. It is set to os.Args[1:] by default, if desired, can be overridden particularly useful when testing.

func (*Command) SetErr

func (c *Command) SetErr(newErr io.Writer)

SetErr sets the destination for error messages. If newErr is nil, os.Stderr is used.

func (*Command) SetFlagErrorFunc

func (c *Command) SetFlagErrorFunc(f func(*Command, error) error)

SetFlagErrorFunc sets a function to generate an error when flag parsing fails.

func (*Command) SetGlobalNormalizationFunc

func (c *Command) SetGlobalNormalizationFunc(n func(f *flag.FlagSet, name string) flag.NormalizedName)

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 (*Command) SetHelpCommand

func (c *Command) SetHelpCommand(cmd *Command)

SetHelpCommand sets help command.

func (*Command) SetHelpFunc

func (c *Command) SetHelpFunc(f func(*Command, []string))

SetHelpFunc sets help function. Can be defined by Application.

func (*Command) SetHelpTemplate

func (c *Command) SetHelpTemplate(s string)

SetHelpTemplate sets help template to be used. Application can use it to set custom template.

func (*Command) SetIn

func (c *Command) SetIn(newIn io.Reader)

SetOut sets the source for input data If newIn is nil, os.Stdin is used.

func (*Command) SetOut

func (c *Command) SetOut(newOut io.Writer)

SetOut sets the destination for usage messages. If newOut is nil, os.Stdout is used.

func (*Command) SetOutput

func (c *Command) SetOutput(output io.Writer)

SetOutput sets the destination for usage and error messages. If output is nil, os.Stderr is used. Deprecated: Use SetOut and/or SetErr instead

func (*Command) SetUsageFunc

func (c *Command) SetUsageFunc(f func(*Command) error)

SetUsageFunc sets usage function. Usage can be defined by application.

func (*Command) SetUsageTemplate

func (c *Command) SetUsageTemplate(s string)

SetUsageTemplate sets usage template. Can be defined by Application.

func (*Command) SetVersionTemplate

func (c *Command) SetVersionTemplate(s string)

SetVersionTemplate sets version template to be used. Application can use it to set custom template.

func (*Command) SuggestionsFor

func (c *Command) SuggestionsFor(typedName string) []string

SuggestionsFor provides suggestions for the typedName.

func (*Command) Traverse

func (c *Command) Traverse(args []string) (*Command, []string, error)

Traverse the command tree to find the command, and parse args for each parent.

func (*Command) Usage

func (c *Command) Usage() error

Usage puts out the usage for the command. Used when a user provides invalid input. Can be defined by user by overriding UsageFunc.

func (*Command) UsageFunc

func (c *Command) UsageFunc() (f func(*Command) error)

UsageFunc returns either the function set by SetUsageFunc for this command or a parent, or it returns a default usage function.

func (*Command) UsagePadding

func (c *Command) UsagePadding() int

UsagePadding return padding for the usage.

func (*Command) UsageString

func (c *Command) UsageString() string

UsageString returns usage string.

func (*Command) UsageTemplate

func (c *Command) UsageTemplate() string

UsageTemplate returns usage template for the command.

func (*Command) UseLine

func (c *Command) UseLine() string

UseLine puts out the full usage for a given command (including parents).

func (*Command) ValidateArgs

func (c *Command) ValidateArgs(args []string) error

func (*Command) VersionTemplate

func (c *Command) VersionTemplate() string

VersionTemplate return version template for the command.

func (*Command) VisitParents

func (c *Command) VisitParents(fn func(*Command))

VisitParents visits all parents of the command and invokes fn on each parent.

type FParseErrWhitelist

type FParseErrWhitelist flag.ParseErrorsWhitelist

FParseErrWhitelist configures Flag parse errors to be ignored

type PositionalArgs

type PositionalArgs func(cmd *Command, args []string) error

func ExactArgs

func ExactArgs(n int) PositionalArgs

ExactArgs returns an error if there are not exactly n args.

func ExactValidArgs

func ExactValidArgs(n int) PositionalArgs

ExactValidArgs returns an error if there are not exactly N positional args OR there are any positional args that are not in the `ValidArgs` field of `Command`

func MaximumNArgs

func MaximumNArgs(n int) PositionalArgs

MaximumNArgs returns an error if there are more than N args.

func MinimumNArgs

func MinimumNArgs(n int) PositionalArgs

MinimumNArgs returns an error if there is not at least N args.

func RangeArgs

func RangeArgs(min int, max int) PositionalArgs

RangeArgs returns an error if the number of args is not within the expected range.

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