Package picocli

Class CommandLine.HelpCommand

java.lang.Object

picocli.CommandLine.HelpCommand

All Implemented Interfaces:

Runnable, CommandLine.IHelpCommandInitializable, CommandLine.IHelpCommandInitializable2

Enclosing class:

CommandLine

public static final class CommandLine.HelpCommand
extends Object
implements CommandLine.IHelpCommandInitializable, CommandLine.IHelpCommandInitializable2, Runnable

Help command that can be installed as a subcommand on all application commands. When invoked with a subcommand argument, it prints usage help for the specified subcommand. For example:

 // print help for subcommand
 command help subcommand
 

When invoked without additional parameters, it prints usage help for the parent command. For example:

 // print help for command
 command help
 

For internationalization: this command has a --help option with descriptionKey = "helpCommand.help", and a COMMAND positional parameter with descriptionKey = "helpCommand.command".

Since:

3.0

Constructor Summary

Constructors

Constructor	Description
HelpCommand()

Method Summary

Modifier and Type	Method	Description
void	init(CommandLine helpCommandLine, CommandLine.Help.Ansi ansi, PrintStream out, PrintStream err)	Deprecated.
void	init(CommandLine helpCommandLine, CommandLine.Help.ColorScheme colorScheme, PrintWriter out, PrintWriter err)	Initializes this object with the information needed to implement a help command that provides usage help for other commands.
void	run()	Invokes usage for the specified command, or for the parent command.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

HelpCommand

public HelpCommand()

Method Detail

run

public void run()

Invokes usage for the specified command, or for the parent command.

Specified by:

run in interface Runnable

init

@Deprecated
public void init(CommandLine helpCommandLine,
                 CommandLine.Help.Ansi ansi,
                 PrintStream out,
                 PrintStream err)

Deprecated.

Initializes this object with the information needed to implement a help command that provides usage help for other commands.

Specified by:

init in interface CommandLine.IHelpCommandInitializable

Parameters:

helpCommandLine - the CommandLine object associated with this help command. Implementors can use this to walk the command hierarchy and get access to the help command's parent and sibling commands.

ansi - whether to use Ansi colors or not

out - the stream to print the usage help message to

err - the error stream to print any diagnostic messages to, in addition to the output from the exception handler

init

public void init(CommandLine helpCommandLine,
                 CommandLine.Help.ColorScheme colorScheme,
                 PrintWriter out,
                 PrintWriter err)

Initializes this object with the information needed to implement a help command that provides usage help for other commands.

Specified by:

init in interface CommandLine.IHelpCommandInitializable2

Parameters:

helpCommandLine - the CommandLine object associated with this help command. Implementors can use this to walk the command hierarchy and get access to the help command's parent and sibling commands.

colorScheme - the color scheme to use when printing help, including whether to use Ansi colors or not

out - the output writer to print the usage help message to

err - the error writer to print any diagnostic messages to, in addition to the output from the exception handler