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
#[cfg(feature = "yaml")]
use std::collections::BTreeMap;
use std::fmt::{Debug, Formatter, Result};

#[cfg(feature = "yaml")]
use yaml_rust::Yaml;

/// `ArgGroup`s are a family of related [arguments] and way for you to express, "Any of these
/// arguments". By placing arguments in a logical group, you can create easier requirement and
/// exclusion rules instead of having to list each argument individually, or when you want a rule
/// to apply "any but not all" arguments.
///
/// For instance, you can make an entire `ArgGroup` required. If [`ArgGroup::multiple(true)`] is
/// set, this means that at least one argument from that group must be present. If
/// [`ArgGroup::multiple(false)`] is set (the default), one and *only* one must be present.
///
/// You can also do things such as name an entire `ArgGroup` as a [conflict] or [requirement] for
/// another argument, meaning any of the arguments that belong to that group will cause a failure
/// if present, or must present respectively.
///
/// Perhaps the most common use of `ArgGroup`s is to require one and *only* one argument to be
/// present out of a given set. Imagine that you had multiple arguments, and you want one of them
/// to be required, but making all of them required isn't feasible because perhaps they conflict
/// with each other. For example, lets say that you were building an application where one could
/// set a given version number by supplying a string with an option argument, i.e.
/// `--set-ver v1.2.3`, you also wanted to support automatically using a previous version number
/// and simply incrementing one of the three numbers. So you create three flags `--major`,
/// `--minor`, and `--patch`. All of these arguments shouldn't be used at one time but you want to
/// specify that *at least one* of them is used. For this, you can create a group.
///
/// Finally, you may use `ArgGroup`s to pull a value from a group of arguments when you don't care
/// exactly which argument was actually used at runtime.
///
/// # Examples
///
/// The following example demonstrates using an `ArgGroup` to ensure that one, and only one, of
/// the arguments from the specified group is present at runtime.
///
/// ```rust
/// # use clap::{App, ArgGroup, ErrorKind};
/// let result = App::new("app")
///     .args_from_usage(
///         "--set-ver [ver] 'set the version manually'
///          --major         'auto increase major'
///          --minor         'auto increase minor'
///          --patch         'auto increase patch'")
///     .group(ArgGroup::with_name("vers")
///          .args(&["set-ver", "major", "minor","patch"])
///          .required(true))
///     .get_matches_from_safe(vec!["app", "--major", "--patch"]);
/// // Because we used two args in the group it's an error
/// assert!(result.is_err());
/// let err = result.unwrap_err();
/// assert_eq!(err.kind, ErrorKind::ArgumentConflict);
/// ```
/// This next example shows a passing parse of the same scenario
///
/// ```rust
/// # use clap::{App, ArgGroup};
/// let result = App::new("app")
///     .args_from_usage(
///         "--set-ver [ver] 'set the version manually'
///          --major         'auto increase major'
///          --minor         'auto increase minor'
///          --patch         'auto increase patch'")
///     .group(ArgGroup::with_name("vers")
///          .args(&["set-ver", "major", "minor","patch"])
///          .required(true))
///     .get_matches_from_safe(vec!["app", "--major"]);
/// assert!(result.is_ok());
/// let matches = result.unwrap();
/// // We may not know which of the args was used, so we can test for the group...
/// assert!(matches.is_present("vers"));
/// // we could also alternatively check each arg individually (not shown here)
/// ```
/// [`ArgGroup::multiple(true)`]: ./struct.ArgGroup.html#method.multiple
/// [arguments]: ./struct.Arg.html
/// [conflict]: ./struct.Arg.html#method.conflicts_with
/// [requirement]: ./struct.Arg.html#method.requires
#[derive(Default)]
pub struct ArgGroup<'a> {
    #[doc(hidden)]
    pub name: &'a str,
    #[doc(hidden)]
    pub args: Vec<&'a str>,
    #[doc(hidden)]
    pub required: bool,
    #[doc(hidden)]
    pub requires: Option<Vec<&'a str>>,
    #[doc(hidden)]
    pub conflicts: Option<Vec<&'a str>>,
    #[doc(hidden)]
    pub multiple: bool,
}

impl<'a> ArgGroup<'a> {
    /// Creates a new instance of `ArgGroup` using a unique string name. The name will be used to
    /// get values from the group or refer to the group inside of conflict and requirement rules.
    ///
    /// # Examples
    ///
    /// ```rust
    /// # use clap::{App, ArgGroup};
    /// ArgGroup::with_name("config")
    /// # ;
    /// ```
    pub fn with_name(n: &'a str) -> Self {
        ArgGroup {
            name: n,
            required: false,
            args: vec![],
            requires: None,
            conflicts: None,
            multiple: false,
        }
    }

    /// Creates a new instance of `ArgGroup` from a .yml (YAML) file.
    ///
    /// # Examples
    ///
    /// ```ignore
    /// # #[macro_use]
    /// # extern crate clap;
    /// # use clap::ArgGroup;
    /// # fn main() {
    /// let yml = load_yaml!("group.yml");
    /// let ag = ArgGroup::from_yaml(yml);
    /// # }
    /// ```
    #[cfg(feature = "yaml")]
    pub fn from_yaml(y: &'a Yaml) -> ArgGroup<'a> { ArgGroup::from(y.as_hash().unwrap()) }

    /// Adds an [argument] to this group by name
    ///
    /// # Examples
    ///
    /// ```rust
    /// # use clap::{App, Arg, ArgGroup};
    /// let m = App::new("myprog")
    ///     .arg(Arg::with_name("flag")
    ///         .short("f"))
    ///     .arg(Arg::with_name("color")
    ///         .short("c"))
    ///     .group(ArgGroup::with_name("req_flags")
    ///         .arg("flag")
    ///         .arg("color"))
    ///     .get_matches_from(vec!["myprog", "-f"]);
    /// // maybe we don't know which of the two flags was used...
    /// assert!(m.is_present("req_flags"));
    /// // but we can also check individually if needed
    /// assert!(m.is_present("flag"));
    /// ```
    /// [argument]: ./struct.Arg.html
    pub fn arg(mut self, n: &'a str) -> Self {
        assert!(self.name != n,
                "ArgGroup '{}' can not have same name as arg inside it",
                &*self.name);
        self.args.push(n);
        self
    }

    /// Adds multiple [arguments] to this group by name
    ///
    /// # Examples
    ///
    /// ```rust
    /// # use clap::{App, Arg, ArgGroup};
    /// let m = App::new("myprog")
    ///     .arg(Arg::with_name("flag")
    ///         .short("f"))
    ///     .arg(Arg::with_name("color")
    ///         .short("c"))
    ///     .group(ArgGroup::with_name("req_flags")
    ///         .args(&["flag", "color"]))
    ///     .get_matches_from(vec!["myprog", "-f"]);
    /// // maybe we don't know which of the two flags was used...
    /// assert!(m.is_present("req_flags"));
    /// // but we can also check individually if needed
    /// assert!(m.is_present("flag"));
    /// ```
    /// [arguments]: ./struct.Arg.html
    pub fn args(mut self, ns: &[&'a str]) -> Self {
        for n in ns {
            self = self.arg(n);
        }
        self
    }

    /// Allows more than one of the ['Arg']s in this group to be used. (Default: `false`)
    ///
    /// # Examples
    ///
    /// Notice in this example we use *both* the `-f` and `-c` flags which are both part of the
    /// group
    ///
    /// ```rust
    /// # use clap::{App, Arg, ArgGroup};
    /// let m = App::new("myprog")
    ///     .arg(Arg::with_name("flag")
    ///         .short("f"))
    ///     .arg(Arg::with_name("color")
    ///         .short("c"))
    ///     .group(ArgGroup::with_name("req_flags")
    ///         .args(&["flag", "color"])
    ///         .multiple(true))
    ///     .get_matches_from(vec!["myprog", "-f", "-c"]);
    /// // maybe we don't know which of the two flags was used...
    /// assert!(m.is_present("req_flags"));
    /// ```
    /// In this next example, we show the default behavior (i.e. `multiple(false)) which will throw
    /// an error if more than one of the args in the group was used.
    ///
    /// ```rust
    /// # use clap::{App, Arg, ArgGroup, ErrorKind};
    /// let result = App::new("myprog")
    ///     .arg(Arg::with_name("flag")
    ///         .short("f"))
    ///     .arg(Arg::with_name("color")
    ///         .short("c"))
    ///     .group(ArgGroup::with_name("req_flags")
    ///         .args(&["flag", "color"]))
    ///     .get_matches_from_safe(vec!["myprog", "-f", "-c"]);
    /// // Because we used both args in the group it's an error
    /// assert!(result.is_err());
    /// let err = result.unwrap_err();
    /// assert_eq!(err.kind, ErrorKind::ArgumentConflict);
    /// ```
    /// ['Arg']: ./struct.Arg.html
    pub fn multiple(mut self, m: bool) -> Self {
        self.multiple = m;
        self
    }

    /// Sets the group as required or not. A required group will be displayed in the usage string
    /// of the application in the format `<arg|arg2|arg3>`. A required `ArgGroup` simply states
    /// that one argument from this group *must* be present at runtime (unless
    /// conflicting with another argument).
    ///
    /// **NOTE:** This setting only applies to the current [`App`] / [`SubCommand`], and not
    /// globally.
    ///
    /// **NOTE:** By default, [`ArgGroup::multiple`] is set to `false` which when combined with
    /// `ArgGroup::required(true)` states, "One and *only one* arg must be used from this group.
    /// Use of more than one arg is an error." Vice setting `ArgGroup::multiple(true)` which
    /// states, '*At least* one arg from this group must be used. Using multiple is OK."
    ///
    /// # Examples
    ///
    /// ```rust
    /// # use clap::{App, Arg, ArgGroup, ErrorKind};
    /// let result = App::new("myprog")
    ///     .arg(Arg::with_name("flag")
    ///         .short("f"))
    ///     .arg(Arg::with_name("color")
    ///         .short("c"))
    ///     .group(ArgGroup::with_name("req_flags")
    ///         .args(&["flag", "color"])
    ///         .required(true))
    ///     .get_matches_from_safe(vec!["myprog"]);
    /// // Because we didn't use any of the args in the group, it's an error
    /// assert!(result.is_err());
    /// let err = result.unwrap_err();
    /// assert_eq!(err.kind, ErrorKind::MissingRequiredArgument);
    /// ```
    /// [`App`]: ./struct.App.html
    /// [`SubCommand`]: ./struct.SubCommand.html
    /// [`ArgGroup::multiple`]: ./struct.ArgGroup.html#method.multiple
    pub fn required(mut self, r: bool) -> Self {
        self.required = r;
        self
    }

    /// Sets the requirement rules of this group. This is not to be confused with a
    /// [required group]. Requirement rules function just like [argument requirement rules], you
    /// can name other arguments or groups that must be present when any one of the arguments from
    /// this group is used.
    ///
    /// **NOTE:** The name provided may be an argument, or group name
    ///
    /// # Examples
    ///
    /// ```rust
    /// # use clap::{App, Arg, ArgGroup, ErrorKind};
    /// let result = App::new("myprog")
    ///     .arg(Arg::with_name("flag")
    ///         .short("f"))
    ///     .arg(Arg::with_name("color")
    ///         .short("c"))
    ///     .arg(Arg::with_name("debug")
    ///         .short("d"))
    ///     .group(ArgGroup::with_name("req_flags")
    ///         .args(&["flag", "color"])
    ///         .requires("debug"))
    ///     .get_matches_from_safe(vec!["myprog", "-c"]);
    /// // because we used an arg from the group, and the group requires "-d" to be used, it's an
    /// // error
    /// assert!(result.is_err());
    /// let err = result.unwrap_err();
    /// assert_eq!(err.kind, ErrorKind::MissingRequiredArgument);
    /// ```
    /// [required group]: ./struct.ArgGroup.html#method.required
    /// [argument requirement rules]: ./struct.Arg.html#method.requires
    pub fn requires(mut self, n: &'a str) -> Self {
        if let Some(ref mut reqs) = self.requires {
            reqs.push(n);
        } else {
            self.requires = Some(vec![n]);
        }
        self
    }

    /// Sets the requirement rules of this group. This is not to be confused with a
    /// [required group]. Requirement rules function just like [argument requirement rules], you
    /// can name other arguments or groups that must be present when one of the arguments from this
    /// group is used.
    ///
    /// **NOTE:** The names provided may be an argument, or group name
    ///
    /// # Examples
    ///
    /// ```rust
    /// # use clap::{App, Arg, ArgGroup, ErrorKind};
    /// let result = App::new("myprog")
    ///     .arg(Arg::with_name("flag")
    ///         .short("f"))
    ///     .arg(Arg::with_name("color")
    ///         .short("c"))
    ///     .arg(Arg::with_name("debug")
    ///         .short("d"))
    ///     .arg(Arg::with_name("verb")
    ///         .short("v"))
    ///     .group(ArgGroup::with_name("req_flags")
    ///         .args(&["flag", "color"])
    ///         .requires_all(&["debug", "verb"]))
    ///     .get_matches_from_safe(vec!["myprog", "-c", "-d"]);
    /// // because we used an arg from the group, and the group requires "-d" and "-v" to be used,
    /// // yet we only used "-d" it's an error
    /// assert!(result.is_err());
    /// let err = result.unwrap_err();
    /// assert_eq!(err.kind, ErrorKind::MissingRequiredArgument);
    /// ```
    /// [required group]: ./struct.ArgGroup.html#method.required
    /// [argument requirement rules]: ./struct.Arg.html#method.requires_all
    pub fn requires_all(mut self, ns: &[&'a str]) -> Self {
        for n in ns {
            self = self.requires(n);
        }
        self
    }

    /// Sets the exclusion rules of this group. Exclusion (aka conflict) rules function just like
    /// [argument exclusion rules], you can name other arguments or groups that must *not* be
    /// present when one of the arguments from this group are used.
    ///
    /// **NOTE:** The name provided may be an argument, or group name
    ///
    /// # Examples
    ///
    /// ```rust
    /// # use clap::{App, Arg, ArgGroup, ErrorKind};
    /// let result = App::new("myprog")
    ///     .arg(Arg::with_name("flag")
    ///         .short("f"))
    ///     .arg(Arg::with_name("color")
    ///         .short("c"))
    ///     .arg(Arg::with_name("debug")
    ///         .short("d"))
    ///     .group(ArgGroup::with_name("req_flags")
    ///         .args(&["flag", "color"])
    ///         .conflicts_with("debug"))
    ///     .get_matches_from_safe(vec!["myprog", "-c", "-d"]);
    /// // because we used an arg from the group, and the group conflicts with "-d", it's an error
    /// assert!(result.is_err());
    /// let err = result.unwrap_err();
    /// assert_eq!(err.kind, ErrorKind::ArgumentConflict);
    /// ```
    /// [argument exclusion rules]: ./struct.Arg.html#method.conflicts_with
    pub fn conflicts_with(mut self, n: &'a str) -> Self {
        if let Some(ref mut confs) = self.conflicts {
            confs.push(n);
        } else {
            self.conflicts = Some(vec![n]);
        }
        self
    }

    /// Sets the exclusion rules of this group. Exclusion rules function just like
    /// [argument exclusion rules], you can name other arguments or groups that must *not* be
    /// present when one of the arguments from this group are used.
    ///
    /// **NOTE:** The names provided may be an argument, or group name
    ///
    /// # Examples
    ///
    /// ```rust
    /// # use clap::{App, Arg, ArgGroup, ErrorKind};
    /// let result = App::new("myprog")
    ///     .arg(Arg::with_name("flag")
    ///         .short("f"))
    ///     .arg(Arg::with_name("color")
    ///         .short("c"))
    ///     .arg(Arg::with_name("debug")
    ///         .short("d"))
    ///     .arg(Arg::with_name("verb")
    ///         .short("v"))
    ///     .group(ArgGroup::with_name("req_flags")
    ///         .args(&["flag", "color"])
    ///         .conflicts_with_all(&["debug", "verb"]))
    ///     .get_matches_from_safe(vec!["myprog", "-c", "-v"]);
    /// // because we used an arg from the group, and the group conflicts with either "-v" or "-d"
    /// // it's an error
    /// assert!(result.is_err());
    /// let err = result.unwrap_err();
    /// assert_eq!(err.kind, ErrorKind::ArgumentConflict);
    /// ```
    /// [argument exclusion rules]: ./struct.Arg.html#method.conflicts_with_all
    pub fn conflicts_with_all(mut self, ns: &[&'a str]) -> Self {
        for n in ns {
            self = self.conflicts_with(n);
        }
        self
    }
}

impl<'a> Debug for ArgGroup<'a> {
    fn fmt(&self, f: &mut Formatter) -> Result {
        write!(f,
               "{{\n\
                   \tname: {:?},\n\
                   \targs: {:?},\n\
                   \trequired: {:?},\n\
                   \trequires: {:?},\n\
                   \tconflicts: {:?},\n\
                }}",
               self.name,
               self.args,
               self.required,
               self.requires,
               self.conflicts)
    }
}

impl<'a, 'z> From<&'z ArgGroup<'a>> for ArgGroup<'a> {
    fn from(g: &'z ArgGroup<'a>) -> Self {
        ArgGroup {
            name: g.name,
            required: g.required,
            args: g.args.clone(),
            requires: g.requires.clone(),
            conflicts: g.conflicts.clone(),
            multiple: g.multiple,
        }
    }
}

#[cfg(feature = "yaml")]
impl<'a> From<&'a BTreeMap<Yaml, Yaml>> for ArgGroup<'a> {
    fn from(b: &'a BTreeMap<Yaml, Yaml>) -> Self {
        // We WANT this to panic on error...so expect() is good.
        let mut a = ArgGroup::default();
        let group_settings = if b.len() == 1 {
            let name_yml = b.keys().nth(0).expect("failed to get name");
            let name_str = name_yml.as_str().expect("failed to convert arg YAML name to str");
            a.name = name_str;
            b.get(name_yml)
                .expect("failed to get name_str")
                .as_hash()
                .expect("failed to convert to a hash")
        } else {
            b
        };

        for (k, v) in group_settings.iter() {
            a = match k.as_str().unwrap() {
                "required" => a.required(v.as_bool().unwrap()),
                "multiple" => a.multiple(v.as_bool().unwrap()),
                "args" => yaml_vec_or_str!(v, a, arg),
                "arg" => {
                    if let Some(ys) = v.as_str() {
                        a = a.arg(ys);
                    }
                    a
                }
                "requires" => yaml_vec_or_str!(v, a, requires),
                "conflicts_with" => yaml_vec_or_str!(v, a, conflicts_with),
                "name" => {
                    if let Some(ys) = v.as_str() {
                        a.name = ys;
                    }
                    a
                }
                s => {
                    panic!("Unknown ArgGroup setting '{}' in YAML file for \
                             ArgGroup '{}'",
                           s,
                           a.name)
                }
            }
        }

        a
    }
}

#[cfg(test)]
mod test {
    use super::ArgGroup;
    #[cfg(feature = "yaml")]
    use yaml_rust::YamlLoader;

    #[test]
    fn groups() {
        let g = ArgGroup::with_name("test")
            .arg("a1")
            .arg("a4")
            .args(&["a2", "a3"])
            .required(true)
            .conflicts_with("c1")
            .conflicts_with_all(&["c2", "c3"])
            .conflicts_with("c4")
            .requires("r1")
            .requires_all(&["r2", "r3"])
            .requires("r4");

        let args = vec!["a1", "a4", "a2", "a3"];
        let reqs = vec!["r1", "r2", "r3", "r4"];
        let confs = vec!["c1", "c2", "c3", "c4"];

        assert_eq!(g.args, args);
        assert_eq!(g.requires, Some(reqs));
        assert_eq!(g.conflicts, Some(confs));
    }

    #[test]
    fn test_debug() {
        let g = ArgGroup::with_name("test")
            .arg("a1")
            .arg("a4")
            .args(&["a2", "a3"])
            .required(true)
            .conflicts_with("c1")
            .conflicts_with_all(&["c2", "c3"])
            .conflicts_with("c4")
            .requires("r1")
            .requires_all(&["r2", "r3"])
            .requires("r4");

        let args = vec!["a1", "a4", "a2", "a3"];
        let reqs = vec!["r1", "r2", "r3", "r4"];
        let confs = vec!["c1", "c2", "c3", "c4"];

        let debug_str = format!("{{\n\
                   \tname: \"test\",\n\
                   \targs: {:?},\n\
                   \trequired: {:?},\n\
                   \trequires: {:?},\n\
                   \tconflicts: {:?},\n\
               }}",
                                args,
                                true,
                                Some(reqs),
                                Some(confs));
        assert_eq!(&*format!("{:?}", g), &*debug_str);
    }

    #[test]
    fn test_from() {
        let g = ArgGroup::with_name("test")
            .arg("a1")
            .arg("a4")
            .args(&["a2", "a3"])
            .required(true)
            .conflicts_with("c1")
            .conflicts_with_all(&["c2", "c3"])
            .conflicts_with("c4")
            .requires("r1")
            .requires_all(&["r2", "r3"])
            .requires("r4");

        let args = vec!["a1", "a4", "a2", "a3"];
        let reqs = vec!["r1", "r2", "r3", "r4"];
        let confs = vec!["c1", "c2", "c3", "c4"];

        let g2 = ArgGroup::from(&g);
        assert_eq!(g2.args, args);
        assert_eq!(g2.requires, Some(reqs));
        assert_eq!(g2.conflicts, Some(confs));
    }

    #[cfg(feature="yaml")]
    #[cfg_attr(feature = "yaml", test)]
    fn test_yaml() {

        let g_yaml = "name: test
args:
- a1
- a4
- a2
- a3
conflicts_with:
- c1
- c2
- c3
- c4
requires:
- r1
- r2
- r3
- r4";
        let yml = &YamlLoader::load_from_str(g_yaml).expect("failed to load YAML file")[0];
        let g = ArgGroup::from_yaml(yml);
        let args = vec!["a1", "a4", "a2", "a3"];
        let reqs = vec!["r1", "r2", "r3", "r4"];
        let confs = vec!["c1", "c2", "c3", "c4"];
        assert_eq!(g.args, args);
        assert_eq!(g.requires, Some(reqs));
        assert_eq!(g.conflicts, Some(confs));
    }
}

impl<'a> Clone for ArgGroup<'a> {
    fn clone(&self) -> Self {
        ArgGroup {
            name: self.name,
            required: self.required,
            args: self.args.clone(),
            requires: self.requires.clone(),
            conflicts: self.conflicts.clone(),
            multiple: self.multiple,
        }
    }
}