miniclap 0.1.1

a no-dependency command line parser
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
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

use crate::arg::{Arg, ArgKind};
use crate::app::App;
use crate::matches::Matches;

#[must_use]
pub fn parse_app(app: &App, argv: &[&str], parents: &[&'static str]) -> Matches {
    if argv.iter().any(|&a| a == "--help" || a == "-h") {
        app.print_help_with_parents(parents);
        std::process::exit(0);
    }

    let mut matches = Matches::default();

    for arg in app.args() {
        match arg.kind {
            ArgKind::Flag => {
                matches.flags.insert(arg.name, false);
            }
            ArgKind::Count => {
                matches.counts.insert(arg.name, 0);
            }
            _ => {}
        }
    }

    let mut i = 0;

    while i < argv.len() {
        let token = argv[i];

        if !token.starts_with('-') {
            if let Some(sub) = app.find_subcommand(token) {
                let mut sub_parents = parents.to_vec();
                sub_parents.push(app.name);

                let sub_matches = parse_app(sub, &argv[i + 1..], &sub_parents);
                matches.matched_sub = Some((sub.name, Box::new(sub_matches)));
                return matches;
            }

            matches.positionals.push(token.to_string());
            i += 1;
            continue;
        }

        if let Some(rest) = token.strip_prefix("--") {
            let (long_name, inline_val) = match rest.split_once('=') {
                Some((k, v)) => (k, Some(v)),
                None => (rest, None),
            };

            if let Some(arg) = find_by_long(app, long_name) {
                match arg.kind {
                    ArgKind::Flag => {
                        matches.flags.insert(arg.name, true);
                    }
                    ArgKind::Count => {
                        *matches.counts.entry(arg.name).or_insert(0) += 1;
                    }
                    ArgKind::Value => {
                        let val = if let Some(v) = inline_val {
                            v.to_string()
                        } else {
                            i += 1;
                            argv.get(i).unwrap_or(&"").to_string()
                        };
                        matches.values.insert(arg.name, val);
                    }
                    ArgKind::Positional => {}
                }
            }
            i += 1;
            continue;
        }

        if let Some(chars_str) = token.strip_prefix('-') {
            let chars: Vec<char> = chars_str.chars().collect();
            let mut ci = 0;

            while ci < chars.len() {
                let ch = chars[ci];

                if let Some(arg) = find_by_short(app, ch) {
                    match arg.kind {
                        ArgKind::Flag => {
                            matches.flags.insert(arg.name, true);
                        }
                        ArgKind::Count => {
                            *matches.counts.entry(arg.name).or_insert(0) += 1;
                        }
                        ArgKind::Value => {
                            let val = if ci + 1 < chars.len() {
                                let v: String = chars[ci + 1..].iter().collect();
                                ci = chars.len();
                                v
                            } else {
                                i += 1;
                                argv.get(i).unwrap_or(&"").to_string()
                            };
                            matches.values.insert(arg.name, val);
                        }
                        ArgKind::Positional => {}
                    }
                }
                ci += 1;
            }

            i += 1;
            continue;
        }

        i += 1;
    }

    matches
}

#[must_use]
pub fn find_by_long(app: &App, name: &str) -> Option<Arg> {
    app.args()
        .find(|a| a.name == name && a.kind != ArgKind::Positional)
        .cloned()
}

#[must_use]
pub fn find_by_short(app: &App, ch: char) -> Option<Arg> {
    app.args().find(|a| a.short == Some(ch)).cloned()
}