structopt 0.2.8

Parse command line argument by defining a struct.
Documentation 
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

// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#[macro_use]
extern crate structopt;

use structopt::StructOpt;

#[test]
fn flatten() {
    #[derive(StructOpt, PartialEq, Debug)]
    struct Common {
        arg: i32,
    }

    #[derive(StructOpt, PartialEq, Debug)]
    struct Opt {
        #[structopt(flatten)]
        common: Common,
    }
    assert_eq!(Opt { common: Common { arg: 42 } }, Opt::from_iter(&["test", "42"]));
    assert!(Opt::clap().get_matches_from_safe(&["test"]).is_err());
    assert!(Opt::clap().get_matches_from_safe(&["test", "42", "24"]).is_err());
}

#[test]
#[should_panic]
fn flatten_twice() {
    #[derive(StructOpt, PartialEq, Debug)]
    struct Common {
        arg: i32,
    }

    #[derive(StructOpt, PartialEq, Debug)]
    struct Opt {
        #[structopt(flatten)]
        c1: Common,
        // Defines "arg" twice, so this should not work.
        #[structopt(flatten)]
        c2: Common,
    }
    Opt::from_iter(&["test", "42", "43"]);
}

#[test]
fn flatten_in_subcommand() {
    #[derive(StructOpt, PartialEq, Debug)]
    struct Common {
        arg: i32,
    }

    #[derive(StructOpt, PartialEq, Debug)]
    struct Add {
        #[structopt(short = "i")]
        interactive: bool,
        #[structopt(flatten)]
        common: Common,
    }

    #[derive(StructOpt, PartialEq, Debug)]
    enum Opt {
        #[structopt(name = "fetch")]
        Fetch {
            #[structopt(short = "a")]
            all: bool,
            #[structopt(flatten)]
            common: Common,
        },

        #[structopt(name = "add")]
        Add(Add),
    }

    assert_eq!(Opt::Fetch { all: false, common: Common { arg: 42 } },
               Opt::from_iter(&["test", "fetch", "42"]));
    assert_eq!(Opt::Add(Add { interactive: true, common: Common { arg: 43 } }),
               Opt::from_iter(&["test", "add", "-i", "43"]));
}