      1
      2
      3
      4
      5
      6
      7
      8
      9
     10
     11
     12
     13
     14
     15
     16
     17
     18
     19
     20
     21
     22
     23
     24
     25
     26
     27
     28
     29
     30
     31
     32
     33
     34
     35
     36
     37
     38
     39
     40
     41
     42
     43
     44
     45
     46
     47
     48
     49
     50
     51
     52
     53
     54
     55
     56
     57
     58
     59
     60
     61
     62
     63
     64
     65
     66
     67
     68
     69
     70
     71
     72
     73
     74
     75
     76
     77
     78
     79
     80
     81
     82
     83
     84
     85
     86
     87
     88
     89
     90
     91
     92
     93
     94
     95
     96
     97
     98
     99
    100
    101
    102
    103
    104
    105
    106
    107
    108
    109
    110
    111
    112
    113
    114
    115
    116
    117
    118
    119
    120
    121
    122
    123
    124
    125
    126
    127
    128
    129
    130
    131
    132
    133
    134
    135
    136
    137
    138
    139
    140
    141
    142
    143
    144
    145
    146
    147
    148
    149
    150
    151
    152
    153
    154
    155
    156
    157
    158
    159
    160
    161
    162
    163
    164
    165
    166
    167
    168
    169
    170
    171
    172
    173
    174
    175
    176
    177
    178
    179
    180
    181
    182
    183
    184
    185
    186
    187
    188
    189
    190
    191
    192
    193
    194
    195
    196
    197
    198
    199
    200
    201
    202
    203
    204
    205
    206
    207
    208
    209
    210
    211
    212
    213
    214
    215
    216
    217
    218
    219
    220
    221
    222
    223
    224
    225
    226
    227
    228
    229
    230
    231
    232
    233
    234
    235
    236
    237
    238
    239
    240
    241
    242
    243
    244
    245
    246
    247
    248
    249
    250
    251
    252
    253
    254
    255
    256
    257
    258
    259
    260
    261
    262
    263
    264
    265
    266
    267
    268
    269
    270
    271
    272
    273
    274
    275
    276
    277
    278
    279
    280
    281
    282
    283
    284
    285
    286
    287
    288
    289
    290
    291
    292
    293
    294
    295
    296
    297
    298
    299
    300
    301
    302
    303
    304
    305
    306
    307
    308
    309
    310
    311
    312
    313
    314
    315
    316
    317
    318
    319
    320
    321
    322
    323
    324
    325
    326
    327
    328
    329
    330
    331
    332
    333
    334
    335
    336
    337
    338
    339
    340
    341
    342
    343
    344
    345
    346
    347
    348
    349
    350
    351
    352
    353
    354
    355
    356
    357
    358
    359
    360
    361
    362
    363
    364
    365
    366
    367
    368
    369
    370
    371
    372
    373
    374
    375
    376
    377
    378
    379
    380
    381
    382
    383
    384
    385
    386
    387
    388
    389
    390
    391
    392
    393
    394
    395
    396
    397
    398
    399
    400
    401
    402
    403
    404
    405
    406
    407
    408
    409
    410
    411
    412
    413
    414
    415
    416
    417
    418
    419
    420
    421
    422
    423
    424
    425
    426
    427
    428
    429
    430
    431
    432
    433
    434
    435
    436
    437
    438
    439
    440
    441
    442
    443
    444
    445
    446
    447
    448
    449
    450
    451
    452
    453
    454
    455
    456
    457
    458
    459
    460
    461
    462
    463
    464
    465
    466
    467
    468
    469
    470
    471
    472
    473
    474
    475
    476
    477
    478
    479
    480
    481
    482
    483
    484
    485
    486
    487
    488
    489
    490
    491
    492
    493
    494
    495
    496
    497
    498
    499
    500
    501
    502
    503
    504
    505
    506
    507
    508
    509
    510
    511
    512
    513
    514
    515
    516
    517
    518
    519
    520
    521
    522
    523
    524
    525
    526
    527
    528
    529
    530
    531
    532
    533
    534
    535
    536
    537
    538
    539
    540
    541
    542
    543
    544
    545
    546
    547
    548
    549
    550
    551
    552
    553
    554
    555
    556
    557
    558
    559
    560
    561
    562
    563
    564
    565
    566
    567
    568
    569
    570
    571
    572
    573
    574
    575
    576
    577
    578
    579
    580
    581
    582
    583
    584
    585
    586
    587
    588
    589
    590
    591
    592
    593
    594
    595
    596
    597
    598
    599
    600
    601
    602
    603
    604
    605
    606
    607
    608
    609
    610
    611
    612
    613
    614
    615
    616
    617
    618
    619
    620
    621
    622
    623
    624
    625
    626
    627
    628
    629
    630
    631
    632
    633
    634
    635
    636
    637
    638
    639
    640
    641
    642
    643
    644
    645
    646
    647
    648
    649
    650
    651
    652
    653
    654
    655
    656
    657
    658
    659
    660
    661
    662
    663
    664
    665
    666
    667
    668
    669
    670
    671
    672
    673
    674
    675
    676
    677
    678
    679
    680
    681
    682
    683
    684
    685
    686
    687
    688
    689

    //! Command Line Argument Parser for Rust
    //!
    //! It is a simple to use, efficient, and full featured library for parsing
    //! command line arguments
    //! and subcommands when writing console, or terminal applications.
    //!
    //! ## About
    //!
    //! `clap` is used to parse *and validate* the string of command line arguments
    //! provided by the
    //! user at runtime. You provide the list of valid possibilities, and `clap`
    //! handles the rest. This
    //! means you focus on your *applications* functionality, and less on the
    //! parsing and validating of
    //! arguments.
    //!
    //! `clap` also provides the traditional version and help switches (or flags)
    //! 'for free' meaning
    //! automatically with no configuration. It does this by checking list of valid
    //! possibilities you
    //! supplied and if you haven't them already (or only defined some of them),
    //! `clap` will auto-
    //! generate the applicable ones. If you are using subcommands, `clap` will
    //! also auto-generate a
    //! `help` subcommand for you in addition to the traditional flags.
    //!
    //! Once `clap` parses the user provided string of arguments, it returns the
    //! matches along with any
    //! applicable values. If the user made an error or typo, `clap` informs them
    //! of the mistake and
    //! exits gracefully. Because of this, you can make reasonable assumptions in
    //! your code about the
    //! validity of the arguments.
    //! ## FAQ
    //!
    //! For a full FAQ and more in depth details, see
    //! [the wiki page](https://github.com/kbknapp/clap-rs/wiki/FAQ)
    //!
    //! ### Comparisons
    //!
    //! First, let me say that these comparisons are highly subjective, and not
    //! meant
    //! in a critical or harsh manner. All the argument parsing libraries out there
    //! (to include `clap`) have their own strengths and weaknesses. Sometimes it
    //! just
    //! comes down to personal taste when all other factors are equal. When in
    //! doubt,
    //! try them all and pick one that you enjoy :) There's plenty of room in the
    //! Rust
    //! community for multiple implementations!
    //!
    //! #### How does `clap` compare to `getopts`?
    //!
    //! [getopts](https://github.com/rust-lang-nursery/getopts) is a very basic,
    //! fairly
    //! minimalist argument parsing library. This isn't a bad thing, sometimes you
    //! don't need tons of features, you just want to parse some simple arguments,
    //! and
    //! have some help text generated for you based on valid arguments you specify.
    //! When using `getopts` you must manually implement most of the common features
    //! (such as checking to display help messages, usage strings, etc.). If you
    //! want a
    //! highly custom argument parser, and don't mind writing most the argument
    //! parser
    //! yourself, `getopts` is an excellent base.
    //!
    //! Due to it's lack of features, `getopts` also doesn't allocate much, or at
    //! all.
    //! This gives it somewhat of a performance boost. Although, as you start
    //! implementing those features you need manually, that boost quickly
    //! disappears.
    //!
    //! Personally, I find many, many people that use `getopts` are manually
    //! implementing features that `clap` has by default. Using `clap` simplifies
    //! your
    //! codebase allowing you to focus on your application, and not argument
    //! parsing.
    //!
    //! Reasons to use `getopts` instead of `clap`
    //!
    //!  * You need a few allocations as possible, don't plan on implementing any
    //!    additional features
    //!  * You want a highly custom argument parser, but want to use an established
    //!    parser as a base
    //!
    //! #### How does `clap` compare to `docopt.rs`?
    //!
    //! I first want to say I'm a big a fan of BurntSushi's work, the creator of
    //! [Docopt.rs](https://github.com/docopt/docopt.rs). I aspire to produce the
    //! quality of libraries that this man does! When it comes to comparing these
    //! two
    //! libraries they are very different. `docopt` tasks you with writing a help
    //! message, and then it parsers that message for you to determine all valid
    //! arguments and their use. Some people LOVE this, others not so much. If
    //! you're
    //! willing to write a detailed help message, it's nice that you can stick that
    //! in
    //! your program and have `docopt` do the rest. On the downside, it's somewhat
    //! less
    //! flexible than other options out there, and requires the help message change
    //! if
    //! you need to make changes.
    //!
    //! `docopt` is also excellent at translating arguments into Rust types
    //! automatically. There is even a syntax extension which will do all this for
    //! you,
    //! ifou to manually translate from arguments to Rust types). To use
    //! BurntSushi's
    //! words, `docopt` is also somewhat of a black box. You get what you get, and
    //! it's
    //! hard to tweak implementation or customise your experience for your use case.
    //!
    //! Because `docopt` is doing a ton of work to parse your help messages and
    //! determine what you were trying to communicate as valid arguments, it's also
    //! one
    //! of the more heavy weight parsers performance-wise. For most applications
    //! this
    //! isn't a concern, but it's something to keep in mind.
    //!
    //! Reasons to use `docopt` instead of `clap`
    //! * You want automatic translation from arguments to Rust types, and are
    //! using a
    //!    nightly compiler
    //!  * Performance isn't a concern
    //!  * You don't have any complex relationships between arguments
    //!
    //! #### All else being equal, what are some reasons to use `clap`?
    //!
    //! `clap` is fast, and as lightweight as possible while still giving all the
    //! features you'd expect from a modern argument parser. If you use `clap` when
    //! just need some simple arguments parsed, you'll find it a walk in the park.
    //! But
    //! `clap` also makes it possible to represent extremely complex, and advanced
    //! requirements, without too much thought. `clap` aims to be intuitive, easy to
    //! use, and fully capable for wide variety use cases and needs.
    //!
    //! ## Quick Examples
    //!
    //! The following examples show a quick example of some of the very basic
    //! functionality of `clap`.
    //! For more advanced usage, such as requirements, exclusions, groups, multiple
    //! values and
    //! occurrences see the [video tutorials][video tutorials],
    //! [documentation][docs], or
    //! [examples/][examples] directory of this crate's repository.
    //!
    //! **NOTE:** All these examples are functionally the same, but show three
    //! different styles in
    //! which to use `clap`
    //!
    //! ```no_run
    //! // (Full example with detailed comments in examples/01a_quick_example.rs)
    //! //
    //! // This example demonstrates clap's "usage strings" method of creating
    //! // arguments which is less less verbose
    //! extern crate clap;
    //! use clap::{Arg, App, SubCommand};
    //!
    //! fn main() {
    //!     let matches = App::new("myapp")
    //!         .version("1.0")
    //!         .author("Kevin K. <kbknapp@gmail.com>")
    //!         .about("Does awesome things")
    //!         .args_from_usage(
    //!             "-c --config=[CONFIG] 'Sets a custom config file'
    //!              <INPUT> 'Sets the input file to use'
    //!              [debug]... -d 'Sets the level of debugging information'")
    //!         .subcommand(SubCommand::with_name("test")
    //!             .about("controls testing features")
    //!             .version("1.3")
    //!             .author("Someone E. <someone_else@other.com>")
    //!             .arg_from_usage(
    //!                 "-v --verbose 'Print test information verbosely'"))
    //!         .get_matches();
    //!
    //!     // Calling .unwrap() is safe here because "INPUT" is required (if
    //!     // "INPUT" wasn't required we could have used an 'if let' to
    //!     // conditionally get the value)
    //!     println!("Using input file: {}", matches.value_of("INPUT").unwrap());
    //!
    //!     // Gets a value for config if supplied by user, or defaults to
    //!     // "default.conf"
    //!     let config = matches.value_of("CONFIG").unwrap_or("default.conf");
    //!     println!("Value for config: {}", config);
    //!
    //!     // Vary the output based on how many times the user used the "debug"
    //!     // flag (i.e. 'myapp -d -d -d' or 'myapp -ddd' vs 'myapp -d')
    //!     match matches.occurrences_of("debug") {
    //!         0 => println!("Debug mode is off"),
    //!         1 => println!("Debug mode is kind of on"),
    //!         2 => println!("Debug mode is on"),
    //!         3 | _ => println!("Don't be crazy"),
    //!     }
    //!
    //!     // You can information about subcommands by requesting their matches by
    //!     // name (as below), requesting just the name used, or both at the same
    //!     // time
    //!     if let Some(matches) = matches.subcommand_matches("test") {
    //!         if matches.is_present("verbose") {
    //!             println!("Printing verbosely...");
    //!         } else {
    //!             println!("Printing normally...");
    //!         }
    //!     }
    //!
    //!     // more program logic goes here...
    //! }
    //! ```
    //!
    //! The following example is functionally the same as the one above, but this
    //! method allows more
    //! advanced configuration options (not shown in this small example), or even
    //! dynamically
    //! generating arguments when desired. Both methods can be used together to get
    //! the best of both
    //! worlds (see the documentation, [examples/][examples], or video tutorials).
    //!
    //! ```no_run
    //! // (Full example with detailed comments in examples/01b_quick_example.rs)
    //! //
    //! // This example demonstrates clap's full 'builder pattern' style of
    //! // creating arguments which is
    //! // more verbose, but allows easier editing, and at times more advanced
    //! // options, or the possibility
    //! // to generate arguments dynamically.
    //! extern crate clap;
    //! use clap::{Arg, App, SubCommand};
    //!
    //! fn main() {
    //!     let matches = App::new("myapp")
    //!         .version("1.0")
    //!         .author("Kevin K. <kbknapp@gmail.com>")
    //!         .about("Does awesome things")
    //!         .arg(Arg::with_name("CONFIG")
    //!             .short("c")
    //!             .long("config")
    //!             .help("Sets a custom config file")
    //!             .takes_value(true))
    //!         .arg(Arg::with_name("INPUT")
    //!             .help("Sets the input file to use")
    //!             .required(true)
    //!             .index(1))
    //!         .arg(Arg::with_name("debug")
    //!             .short("d")
    //!             .multiple(true)
    //!             .help("Sets the level of debugging information"))
    //!         .subcommand(SubCommand::with_name("test")
    //!             .about("controls testing features")
    //!             .version("1.3")
    //!             .author("Someone E. <someone_else@other.com>")
    //!             .arg(Arg::with_name("verbose")
    //!                 .short("v")
    //!                 .help("print test information verbosely")))
    //!         .get_matches();
    //!
    //!     // Calling .unwrap() is safe here because "INPUT" is required (if
    //!     // "INPUT" wasn't required we could have used an 'if let' to
    //!     // conditionally get the value)
    //!     println!("Using input file: {}", matches.value_of("INPUT").unwrap());
    //!
    //!     // Gets a value for config if supplied by user, or defaults to
    //!     // "default.conf"
    //!     let config = matches.value_of("CONFIG").unwrap_or("default.conf");
    //!     println!("Value for config: {}", config);
    //!
    //!     // Vary the output based on how many times the user used the "debug"
    //!     // flag (i.e. 'myapp -d -d -d' or 'myapp -ddd' vs 'myapp -d')
    //!     match matches.occurrences_of("debug") {
    //!         0 => println!("Debug mode is off"),
    //!         1 => println!("Debug mode is kind of on"),
    //!         2 => println!("Debug mode is on"),
    //!         3 | _ => println!("Don't be crazy"),
    //!     }
    //!
    //!     // You can information about subcommands by requesting their matches by
    //!     // name (as below), requesting just the name used, or both at the same
    //!     // time
    //!     if let Some(matches) = matches.subcommand_matches("test") {
    //!         if matches.is_present("verbose") {
    //!             println!("Printing verbosely...");
    //!         } else {
    //!             println!("Printing normally...");
    //!         }
    //!     }
    //!
    //!     // more program logic goes here...
    //! }
    //! ```
    //!
    //! The following combines the previous two examples by using the simplicity of
    //! the `from_usage`
    //! methods and the performance of the Builder Pattern.
    //!
    //! ```no_run
    //! // (Full example with detailed comments in examples/01c_quick_example.rs)
    //! //
    //! // This example demonstrates clap's "usage strings" method of creating
    //! // arguments which is less verbose
    //! #[macro_use]
    //! extern crate clap;
    //!
    //! fn main() {
    //!     let matches = clap_app!(myapp =>
    //!         (version: "1.0")
    //!         (author: "Kevin K. <kbknapp@gmail.com>")
    //!         (about: "Does awesome things")
    //!         (@arg CONFIG: -c --config +takes_value "Sets a custom config file")
    //!         (@arg INPUT: +required "Sets the input file to use")
    //!         (@arg debug: -d ... "Sets the level of debugging information")
    //!         (@subcommand test =>
    //!             (about: "controls testing features")
    //!             (version: "1.3")
    //!             (author: "Someone E. <someone_else@other.com>")
    //!             (@arg verbose: -v --verbose "Print test information verbosely")
    //!         )
    //!     ).get_matches();
    //!
    //!     // Calling .unwrap() is safe here because "INPUT" is required (if
    //!     // "INPUT" wasn't required we could have used an 'if let' to
    //!     // conditionally get the value)
    //!     println!("Using input file: {}", matches.value_of("INPUT").unwrap());
    //!
    //!     // Gets a value for config if supplied by user, or defaults to
    //!     // "default.conf"
    //!     let config = matches.value_of("CONFIG").unwrap_or("default.conf");
    //!     println!("Value for config: {}", config);
    //!
    //!     // Vary the output based on how many times the user used the "debug"
    //!     // flag (i.e. 'myapp -d -d -d' or 'myapp -ddd' vs 'myapp -d')
    //!     match matches.occurrences_of("debug") {
    //!         0 => println!("Debug mode is off"),
    //!         1 => println!("Debug mode is kind of on"),
    //!         2 => println!("Debug mode is on"),
    //!         3 | _ => println!("Don't be crazy"),
    //!     }
    //!
    //!     // You can information about subcommands by requesting their matches by
    //!     // name (as below), requesting just the name used, or both at the same
    //!     // time
    //!     if let Some(matches) = matches.subcommand_matches("test") {
    //!         if matches.is_present("verbose") {
    //!             println!("Printing verbosely...");
    //!         } else {
    //!             println!("Printing normally...");
    //!         }
    //!     }
    //!
    //!     // more program logic goes here...
    //! }
    //! ```
    //!
    //! This final method shows how you can use a YAML file to build your CLI and
    //! keep your Rust source
    //! tidy. First, create the `cli.yml` file to hold your CLI options, but it
    //! could be called
    //! anything we like (we'll use the same both examples above to keep it
    //! functionally equivalent):
    //!
    //! ```yaml
    //! name: myapp
    //! version: 1.0
    //! author: Kevin K. <kbknapp@gmail.com>
    //! about: Does awesome things
    //! args:
    //!     - CONFIG:
    //!         short: c
    //!         long: config
    //!         help: Sets a custom config file
    //!         takes_value: true
    //!     - INPUT:
    //!         help: Sets the input file to use
    //!         required: true
    //!         index: 1
    //!     - debug:
    //!         short: d
    //!         multiple: true
    //!         help: Sets the level of debugging information
    //! subcommands:
    //!     - test:
    //!         about: controls testing features
    //!         version: 1.3
    //!         author: Someone E. <someone_else@other.com>
    //!         args:
    //!             - verbose:
    //!                 short: v
    //!                 help: print test information verbosely
    //! ```
    //!
    //! Now we create our `main.rs` file just like we would have with the previous
    //! two examples:
    //!
    //! ```ignore
    //! // (Full example with detailed comments in examples/17_yaml.rs)
    //! //
    //! // This example demonstrates clap's building from YAML style of creating
    //! arguments which is far
    //! // more clean, but takes a very small performance hit compared to the other
    //! two methods.
    //! #[macro_use]
    //! extern crate clap;
    //! use clap::App;
    //!
    //! fn main() {
    //! // The YAML file is found relative to the current file, similar to how
    //! modules are found
    //!     let yaml = load_yaml!("cli.yml");
    //!     let matches = App::from_yaml(yaml).get_matches();
    //!
    //! // Calling .unwrap() is safe here because "INPUT" is required (if
    //! "INPUT" wasn't
    //! // required we could have used an 'if let' to conditionally get the
    //! value)
    //!     println!("Using input file: {}", matches.value_of("INPUT").unwrap());
    //!
    //! // Gets a value for config if supplied by user, or defaults to
    //! "default.conf"
    //!     let config = matches.value_of("CONFIG").unwrap_or("default.conf");
    //!     println!("Value for config: {}", config);
    //!
    //! // Vary the output based on how many times the user used the "debug"
    //! flag
    //!     // (i.e. 'myapp -d -d -d' or 'myapp -ddd' vs 'myapp -d'
    //!     match matches.occurrences_of("debug") {
    //!         0 => println!("Debug mode is off"),
    //!         1 => println!("Debug mode is kind of on"),
    //!         2 => println!("Debug mode is on"),
    //!         3 | _ => println!("Don't be crazy"),
    //!     }
    //!
    //! // You can information about subcommands by requesting their matches by
    //! name
    //!     // (as below), requesting just the name used, or both at the same time
    //!     if let Some(matches) = matches.subcommand_matches("test") {
    //!         if matches.is_present("verbose") {
    //!             println!("Printing verbosely...");
    //!         } else {
    //!             println!("Printing normally...");
    //!         }
    //!     }
    //!
    //!     // more program logic goes here...
    //! }
    //! ```
    //!
    //! If you were to compile any of the above programs and run them with the flag
    //! `--help` or `-h`
    //! (or `help` subcommand, since we defined `test` as a subcommand) the
    //! following would be output
    //!
    //! **NOTE**: The YAML option requires adding a special `features` flag when
    //! compiling `clap`
    //! because it is not compiled by default since it takes additional
    //! dependencies that some people
    //! may not need. Simply change your `clap = "1"` to `clap = {version = "1",
    //! features = ["yaml"]}`
    //! in your `Cargo.toml` to use the YAML version.
    //!
    //! ```text
    //! $ myapp --help
    //! myapp 1.0
    //! Kevin K. <kbknapp@gmail.com>
    //! Does awesome things
    //!
    //! USAGE:
    //!     MyApp [FLAGS] [OPTIONS] <INPUT> [SUBCOMMAND]
    //!
    //! FLAGS:
    //!     -d               Turn debugging information on
    //!     -h, --help       Prints this message
    //!     -V, --version    Prints version information
    //!
    //! OPTIONS:
    //!     -c, --config <CONFIG>    Sets a custom config file
    //!
    //! ARGS:
    //!     INPUT    The input file to use
    //!
    //! SUBCOMMANDS:
    //!     help    Prints this message
    //!     test    Controls testing features
    //! ```
    //!
    //! **NOTE:** You could also run `myapp test --help` to see similar output and
    //! options for the
    //! `test` subcommand.
    //!
    //! ## Try it!
    //!
    //! ### Pre-Built Test
    //!
    //! To try out the pre-built example, use the following steps:
    //!
    //! * Clone the repo `$ git clone https://github.com/kbknapp/clap-rs && cd
    //! clap-rs/clap-tests`
    //! * Compile the example `$ cargo build --release`
    //! * Run the help info `$ ./target/release/claptests --help`
    //! * Play with the arguments!
    //!
    //! ### BYOB (Build Your Own Binary)
    //!
    //! To test out `clap`'s default auto-generated help/version follow these steps:
    //! * Create a new cargo project `$ cargo new fake --bin && cd fake`
    //! * Add `clap` to your `Cargo.toml`
    //! *
    //! ```toml
    //! [dependencies]
    //! clap = "1"
    //! ```
    //!
    //! * Add the following to your `src/main.rs`
    //!
    //! ```no_run
    //! extern crate clap;
    //! use clap::App;
    //!
    //! fn main() {
    //!   let _ = App::new("fake").version("v1.0-beta").get_matches();
    //! }
    //! ```
    //!
    //! * Build your program `$ cargo build --release`
    //! * Run w/ help or version `$ ./target/release/fake --help` or `$
    //! ./target/release/fake --version`
    //!
    //! ## Usage
    //!
    //! For full usage, add `clap` as a dependency in your `Cargo.toml` file to use
    //! from crates.io:
    //!
    //!  ```toml
    //!  [dependencies]
    //!  clap = "1"
    //!  ```
    //!  Or track the latest on the master branch at github:
    //!
    //! ```toml
    //! [dependencies.clap]
    //! git = "https://github.com/kbknapp/clap-rs.git"
    //! ```
    //!
    //! Add `extern crate clap;` to your crate root.
    //!
    //! Define a list of valid arguments for your program (see the
    //! [documentation][docs] or
    //! [examples/][examples] directory of this repo)
    //!
    //! Then run `cargo build` or `cargo update && cargo build` for your project.
    //!
    //! ### Optional Dependencies / Features
    //!
    //! If you'd like to keep your dependency list to **only** `clap`, you can
    //! disable any features
    //! that require an additional dependency. To do this, add this to your
    //! `Cargo.toml`:
    //!
    //! ```toml
    //! [dependencies.clap]
    //! version = "1"
    //! default-features = false
    //! ```
    //!
    //! You can also selectively enable only the features you'd like to include, by
    //! adding:
    //!
    //! ```toml
    //! [dependencies.clap]
    //! version = "1"
    //! default-features = false
    //!
    //! # Cherry-pick the features you'd like to use
    //! features = [ "suggestions", "color" ]
    //! ```
    //!
    //! The following is a list of optional `clap` features:
    //!
    //! * **"suggestions"**: Turns on the `Did you mean '--myoption' ?` feature for
    //! when users make
    //! typos.
    //! * **"color"**: Turns on red error messages. This feature only works on
    //! non-Windows OSs.
    //! * **"lints"**: This is **not** included by default and should only be used
    //! while developing to
    //! run basic lints against changes. This can only be used on Rust nightly.
    //!
    //! ### Dependencies Tree
    //!
    //! The following graphic depicts `clap`s dependency graph.
    //!
    //!  * **Dashed** Line: Optional dependency
    //! * **Red** Color: **NOT** included by default (must use cargo `features` to
    //! enable)
    //!
    //! ![clap dependencies](https://raw.githubusercontent.
    //! com/kbknapp/clap-rs/master/clap.png)
    //!
    //! ### More Information
    //!
    //! You can find complete documentation on the [github-pages site][docs] for
    //! this project.
    //!
    //! You can also find usage examples in the [examples/][examples] directory of
    //! this repo.
    //!
    //! #### Video Tutorials
    //!
    //! There's also the video tutorial series [Argument Parsing with Rust][video
    //! tutorials] that I've
    //! been working on.
    //!
    //! *Note*: Two new videos have just been added ([08 From
    //! Usage](https://youtu.be/xc6VdedFrG0), and
    //! [09 Typed Values](https://youtu.be/mZn3C1DnD90)), if you're already
    //! familiar with `clap` but
    //! want to know more about these two details you can check out those videos
    //! without watching the
    //! previous few.
    //!
    //! *Note*: Apologies for the resolution of the first video, it will be updated
    //! to a better
    //! resolution soon. The other videos have a proper resolution.
    //!
    //! ### Running the tests
    //!
    //! If contributing, you can run the tests as follows (assuming you're in the
    //! `clap-rs` directory)
    //!
    //! ```sh
    //! cargo test --features yaml && make -C clap-tests test
    //! ```
    //!
    //! ## License
    //!
    //! `clap` is licensed under the MIT license. Please read the
    //! [LICENSE-MIT][license]
    //! file in
    //! this repository for more information.
    //!
    //! [examples]: https://github.com/kbknapp/clap-rs/tree/master/examples
    //! [docs]: http://kbknapp.github.io/clap-rs/clap/index.html
    //! [video tutorials]:
    //! https://www.youtube.com/playlist?list=PLza5oFLQGTl0Bc_EU_pBNcX-rhVqDTRxv
    //! [license]:
    //! https://raw.githubusercontent.com/kbknapp/clap-rs/master/LICENSE-MIT

    #![crate_type= "lib"]
    #![cfg_attr(feature = "nightly", feature(plugin))]
    #![cfg_attr(feature = "lints", plugin(clippy))]
    #![cfg_attr(feature = "lints", deny(warnings))]
    #![cfg_attr(not(any(feature = "lints", feature = "nightly")), deny(unstable_features))]
    #![deny(missing_docs,
            missing_debug_implementations,
            missing_copy_implementations,
            trivial_casts,
            trivial_numeric_casts,
            unsafe_code,
            unused_import_braces,
            unused_qualifications)]
    // clippy false positives, or ones we're ok with...
    #![cfg_attr(feature = "lints", allow(explicit_iter_loop))]
    #![cfg_attr(feature = "lints", allow(should_implement_trait))]
    #![cfg_attr(feature = "lints", allow(cyclomatic_complexity))]
    // Only while bitflats uses "_first" inside it's macros
    #![cfg_attr(feature = "lints", allow(used_underscore_binding))]

    #[cfg(feature = "suggestions")]
    extern crate strsim;
    #[cfg(feature = "color")]
    extern crate ansi_term;
    #[cfg(feature = "yaml")]
    extern crate yaml_rust;
    #[macro_use]
    extern crate bitflags;
    extern crate vec_map;

    #[cfg(feature = "yaml")]
    pub use yaml_rust::YamlLoader;
    pub use args::{Arg, ArgGroup, ArgMatches, SubCommand};
    pub use app::{App, AppSettings};
    pub use fmt::Format;
    pub use errors::{ClapError, ClapErrorType};

    #[macro_use]
    mod macros;
    mod app;
    mod args;
    mod usageparser;
    mod fmt;
    mod suggestions;
    mod errors;

# Help

## Keyboard Shortcuts

?
  Show this help dialog
S
  Focus the search field
⇤
  Move up in search results
⇥
  Move down in search results
⏎
  Go to active search result

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)