File: README.md

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Airline
=======

Airline is a Java annotation-based framework for parsing Git like command line structures.

Latest release is 0.6, available from Maven Central.

```xml
<dependency>
    <groupId>io.airlift</groupId>
    <artifactId>airline</artifactId>
    <version>0.6</version>
</dependency>
```

Here is a quick example:

```java
public class Git
{
    public static void main(String[] args)
    {
        CliBuilder<Runnable> builder = Cli.<Runnable>builder("git")
                .withDescription("the stupid content tracker")
                .withDefaultCommand(Help.class)
                .withCommands(Help.class, Add.class);

        builder.withGroup("remote")
                .withDescription("Manage set of tracked repositories")
                .withDefaultCommand(RemoteShow.class)
                .withCommands(RemoteShow.class, RemoteAdd.class);

        Cli<Runnable> gitParser = builder.build();

        gitParser.parse(args).run();
    }

    public static class GitCommand implements Runnable
    {
        @Option(type = OptionType.GLOBAL, name = "-v", description = "Verbose mode")
        public boolean verbose;

        public void run()
        {
            System.out.println(getClass().getSimpleName());
        }
    }

    @Command(name = "add", description = "Add file contents to the index")
    public static class Add extends GitCommand
    {
        @Arguments(description = "Patterns of files to be added")
        public List<String> patterns;

        @Option(name = "-i", description = "Add modified contents interactively.")
        public boolean interactive;
    }

    @Command(name = "show", description = "Gives some information about the remote <name>")
    public static class RemoteShow extends GitCommand
    {
        @Option(name = "-n", description = "Do not query remote heads")
        public boolean noQuery;

        @Arguments(description = "Remote to show")
        public String remote;
    }

    @Command(name = "add", description = "Adds a remote")
    public static class RemoteAdd extends GitCommand
    {
        @Option(name = "-t", description = "Track only a specific branch")
        public String branch;

        @Arguments(description = "Remote repository to add")
        public List<String> remote;
    }
}
```

Assuming you have packaged this as an executable program named 'git', you would be able to execute the following commands:

```shell
$ git add -p file

$ git remote add origin git@github.com:airlift/airline.git

$ git -v remote show origin
```



Single Command Mode
===================

Airline can also be used for simple, single-command programs:

```java
@Command(name = "ping", description = "network test utility")
public class Ping
{
    @Inject
    public HelpOption helpOption;

    @Option(name = {"-c", "--count"}, description = "Send count packets")
    public int count = 1;

    public static void main(String... args)
    {
        Ping ping = SingleCommand.singleCommand(Ping.class).parse(args);

        if (ping.helpOption.showHelpIfRequested()) {
            return;
        }

        ping.run();
    }

    public void run()
    {
        System.out.println("Ping count: " + count);
    }
}
```

Assuming you have packaged this as an executable program named 'ping', you would be able to execute the following commands:

```shell
$ ping

$ ping -c 5

$ ping --help
```



Help System
===========

Airline contains a fully automated help system, which generates man-page-like documentation driven by the Java
annotations.

As you may have noticed in the git code above, we added `Help.class` to the cli.  This command is provided by Airline and works as follows:

```shell
$ git help
usage: git [-v] <command> [<args>]

The most commonly used git commands are:
    add       Add file contents to the index
    help      Display help information
    remote    Manage set of tracked repositories

See 'git help <command>' for more information on a specific command.


$ git help git
NAME
        git - the stupid content tracker

SYNOPSIS
        git [-v] <command> [<args>]

OPTIONS
        -v
            Verbose mode

COMMANDS
        help
            Display help information

        add
            Add file contents to the index

        remote show
            Gives some information about the remote <name>

        remote add
            Adds a remote



$ git help add
NAME
        git add - Add file contents to the index

SYNOPSIS
        git [-v] add [-i] [--] [<patterns>...]

OPTIONS
        -i
            Add modified contents interactively.

        -v
            Verbose mode

        --
            This option can be used to separate command-line options from the
            list of argument, (useful when arguments might be mistaken for
            command-line options

        <patterns>
            Patterns of files to be added



$ git help remote
NAME
        git remote - Manage set of tracked repositories

SYNOPSIS
        git [-v] remote
        git [-v] remote add [-t <branch>]
        git [-v] remote show [-n]

OPTIONS
        -v
            Verbose mode

COMMANDS
        With no arguments, Gives some information about the remote <name>

        show
            Gives some information about the remote <name>

            With -n option, Do not query remote heads

        add
            Adds a remote

            With -t option, Track only a specific branch



$ git help remote show
NAME
        git remote show - Gives some information about the remote <name>

SYNOPSIS
        git [-v] remote show [-n] [--] [<remote>]

OPTIONS
        -n
            Do not query remote heads

        -v
            Verbose mode

        --
            This option can be used to separate command-line options from the
            list of argument, (useful when arguments might be mistaken for
            command-line options

        <remote>
            Remote to show
```

We have also, add `Help.class` as the default command for git, so if you execute git without any arguments, you will see the following:

```shell
$ git help
usage: git [-v] <command> [<args>]

The most commonly used git commands are:
    add       Add file contents to the index
    help      Display help information
    remote    Manage set of tracked repositories

See 'git help <command>' for more information on a specific command.
```

For simple, single-command programs like ping, use the `HelpOption` option as shown in the example above.
`HelpOption` handles the options `-h` and `--help` and provides the `showHelpIfRequested()` method
to automatically show the following help output:

```shell
$ ping -h
NAME
        ping - network test utility

SYNOPSIS
        ping [(-c <count> | --count <count>)] [(-h | --help)]

OPTIONS
        -c <count>, --count <count>
            Send count packets

        -h, --help
            Display help information
```