### Undecorated Arguments for Subcommands

Source: https://github.com/mysteriouspants/argumentparser/blob/master/README.md

Demonstrates using undecorated arguments to create 'subcommands', like 'commit' in this example.

```shell
foo commit -Am "Why are you reinventing git?"
```

--------------------------------

### Defining Injected Signatures for Subcommands

Source: https://github.com/mysteriouspants/argumentparser/blob/master/README.md

Example of defining injected signatures for a subcommand, allowing for nested argument parsing.

```objective-c
    XPMArgumentSignature * commitSubcommand =
      [XPMArgumentSignature argumentSignatureWithFormat:@"[commit]"];
    [commitSubcommand setInjectedSignatures:[NSSet setWithObjects:
      [XPMArgumentSignature argumentSignatureWithFormat:@"[-A --all]"],
      [XPMArgumentSignature argumentSignatureWithFormat:@"[-m --commit-message]="], nil]];
```

--------------------------------

### Separating Value Lists with Double Dash

Source: https://github.com/mysteriouspants/argumentparser/blob/master/README.md

Example of using a double dash ('--') as a value barrier to separate lists of values for different arguments.

```shell
foo -ofv ouput1 output2 output3 -- input1 input2 input3 input4
```

--------------------------------

### Undecorated Arguments for Input/Output

Source: https://github.com/mysteriouspants/argumentparser/blob/master/README.md

Shows how to use undecorated arguments for specifying input and output files, similar to the 'dd' utility.

```shell
foo if=infile of=outfile
```

--------------------------------

### Custom Help Descriptions for Flags

Source: https://github.com/mysteriouspants/argumentparser/blob/master/README.md

Define custom help messages for command-line flags using `setDescriptionHelper`. This allows for more user-friendly and informative help output.

```Objective-C
XPMArgumentSignature * verbose = [XPMArgumentSignature argumentSignatureWithFormat:@"[-v --verbose]"];
XPMArgumentSignature * help = [XPMArgumentSignature argumentSignatureWithFormat:@"[-h --help]"];

[verbose setDescriptionHelper:(NSString *)(^)(XPMArgumentSignature * currentSignature, NSUInteger indentLevel, NSUInteger terminalWidth) {
    return [@"-v --verbose  Emit more information." xpmargs_mutableStringByIndentingToWidth:indentLevel * 2 lineLength:terminalWidth];
}];
[help setDescriptionHelper:(NSString *)(^)(XPMArgumentSignature * currentSignature, NSUInteger indentLevel, NSUInteger terminalWidth) {
    return [@"-h --help     Show this message." xpmargs_mutableStringByIndentingToWidth:indentLevel * 2 lineLength:terminalWidth];
}];

XPMArgumentPackage * package = 
 [[NSProcessInfo processInfo] xpmargs_parseArgumentsWithSignatures:[NSSet setWithObjects:verbose, help, nil]];

if ([package booleanValueOfFlag:help]) {
    struct winsize ws;
    ioctl(0, TIOCGWINSZ, &ws);

    printf("My Really Cool CLI Tool v0.1\n\n");
    printf("%s\n", [[verbose descriptionForHelpWithIndent:2 width:ws.ws_col] UTF8String]);
    printf("%s\n", [[help descriptionForHelpWithIndent:2 width:ws.ws_col] UTF8String]);
    printf("\n(C) 2012 by Your Face. All your base are belong to us.\n");
}
```

--------------------------------

### Handling Value Barriers with Multiple Arguments

Source: https://github.com/mysteriouspants/argumentparser/blob/master/README.md

Demonstrates how value barriers (like '--' or another argument) separate lists of values when multiple arguments accept multiple values.

```objective-c
    XPMArgumentSignature
      *inFiles = [XPMArgumentSignature argumentSignatureWithFormat:@"[-f --input-files]={1,5}"],
      *outputFiles = [XPMArgumentSignature argumentSignatureWithFormat:@"[-o --output-files]={1,5}"];
```

--------------------------------

### Defining Argument Signature with Value Range

Source: https://github.com/mysteriouspants/argumentparser/blob/master/README.md

Shows how to define an argument signature that accepts a range of values (1 to 5) per invocation.

```objective-c
    XPMArgumentSignature * files =
        [XPMArgumentSignature argumentSignatureWithFormat:@"[-f --files]={1,5}"];
```

--------------------------------

### Separating Value Lists with Argument Invocation

Source: https://github.com/mysteriouspants/argumentparser/blob/master/README.md

Illustrates using another argument invocation (e.g., '-v') as a value barrier to separate lists of values.

```shell
foo -of ouput1 output2 output3 -v input1 input2 input3 input4
```

--------------------------------

### Basic Argument Parsing

Source: https://github.com/mysteriouspants/argumentparser/blob/master/README.md

Defines argument signatures and parses them using XPMArgumentParser. Checks for boolean flags and specific argument values.

```objective-c
    XPMArgumentSignature
      * force = [XPMArgumentSignature argumentSignatureWithFormat:@"[-f --force]"],
      * soft = [XPMArgumentSignature argumentSignatureWithFormat:@"[-s --soft]"],
      * outputFile = [XPMArgumentSignature argumentSignatureWithFormat:@"[-o --output-file of]=",
      * inputFile = [XPMArgumentSignature argumentSignatureWithFormat:@"[-i --input-file if]={1,}"];
      
    NSArray * signatures = @[force, soft, outputFile, inputFile];
    
    XPMArgumentPackage * package =
     [[NSProcessInfo currentProcess] xpmargs_parseArgumentsWithSignatures:signatures];

    if ([package booleanValueOfSignature:soft]) {
        // presumably you'd do something
    }

    if ([package firstObjectForSignature:inputFile]) {
        printf("dude, you gotta specify a file!\n");
        return -1;
    }
```

--------------------------------

### Multiple Values in a Group (Lazy Way)

Source: https://github.com/mysteriouspants/argumentparser/blob/master/README.md

Demonstrates the 'lazy way' of assigning multiple values to flags within a group, where values are assigned based on their order.

```shell
spiffy -io file1 file2
```

--------------------------------

### Multiple Values in a Group (Long Way)

Source: https://github.com/mysteriouspants/argumentparser/blob/master/README.md

Illustrates the 'long way' of assigning multiple values to flags within a group, explicitly specifying each flag and its value.

```shell
spiffy -i file1 -o file2
```

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