rmd 0.5.3

An improved rm implementation able to remove duplicate files
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
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

#[derive(Debug, PartialEq)]
pub enum SpecToken<'a> {
    Number(u64),
    Text(&'a str),
}

enum State {
    Init,
    Number,
    Text,
}

pub struct SpecTokenizer<'a> {
    string: &'a str,
    state: State,
    begin: usize,
    end: usize,
}

impl<'a> SpecTokenizer<'a> {
    pub fn new(string: &'a str) -> Self {
        SpecTokenizer {
            string,
            state: State::Init,
            begin: 0,
            end: 0,
        }
    }
    fn take_next(&mut self) {
        self.begin = self.end;
        self.state = State::Init;
        let mut end = true;
        for ch in self.string[self.begin..].chars() {
            match self.state {
                State::Init => {
                    if ch.is_ascii_digit() {
                        self.state = State::Number;
                        self.end = self.begin;
                    } else if ch.is_ascii_alphabetic() {
                        self.state = State::Text;
                        self.end = self.begin;
                    } else {
                        self.begin += 1;
                    }
                }
                State::Number => {
                    self.end += 1;
                    if !ch.is_numeric() {
                        end = false;
                        break;
                    }
                }
                State::Text => {
                    self.end += 1;
                    if !ch.is_ascii_alphabetic() {
                        end = false;
                        break;
                    }
                }
            }
        }
        if end {
            self.end = self.string.len();
        }
    }
}

impl<'a> Iterator for SpecTokenizer<'a> {
    type Item = SpecToken<'a>;

    fn next(&mut self) -> Option<SpecToken<'a>> {
        self.take_next();
        if self.begin == self.string.len() {
            return None;
        }

        let tmp = &self.string[self.begin..self.end];
        let out = match self.state {
            State::Number => {
                let n: u64 = tmp.parse().unwrap();
                SpecToken::Number(n)
            }
            State::Text => SpecToken::Text(tmp),
            State::Init => panic!(),
        };
        Some(out)
    }
}

#[cfg(test)]
mod test {

    use super::*;

    #[test]
    fn test_specification_parser() {
        let spec = "56year,,,12month++,+,5day";
        let mut tokenizer = SpecTokenizer::new(spec);
        assert_eq!(tokenizer.next(), Some(SpecToken::Number(56)));
        assert_eq!(tokenizer.next(), Some(SpecToken::Text("year")));
        assert_eq!(tokenizer.next(), Some(SpecToken::Number(12)));
        assert_eq!(tokenizer.next(), Some(SpecToken::Text("month")));
        assert_eq!(tokenizer.next(), Some(SpecToken::Number(5)));
        assert_eq!(tokenizer.next(), Some(SpecToken::Text("day")));
        assert_eq!(tokenizer.next(), None);
    }

    #[test]
    fn test_wrong_specification() {
        let spec = "...........";
        let mut tokenizer = SpecTokenizer::new(spec);
        assert_eq!(tokenizer.next(), None);
    }

    #[test]
    fn test_take_next() {
        let spec = "55year,12month+5day";
        let mut tokenizer = SpecTokenizer::new(spec);
        // 56
        run_take_next(&mut tokenizer, 0, 2);
        // year
        run_take_next(&mut tokenizer, 2, 6);
        // 12
        run_take_next(&mut tokenizer, 7, 9);
        // month
        run_take_next(&mut tokenizer, 9, 14);
        // 5
        run_take_next(&mut tokenizer, 15, 16);
        // day
        run_take_next(&mut tokenizer, 16, 19);
    }

    fn run_take_next(tokenizer: &mut SpecTokenizer, begin: usize, end: usize) {
        tokenizer.take_next();
        assert_eq!(
            tokenizer.begin,
            begin,
            "Fail: expected {} {}, actual {} {}, result '{}'",
            begin,
            end,
            tokenizer.begin,
            tokenizer.end,
            &tokenizer.string[tokenizer.begin..tokenizer.end]
        );
        assert_eq!(
            tokenizer.end,
            end,
            "Fail: expected {} {}, actual {} {}, result '{}'",
            begin,
            end,
            tokenizer.begin,
            tokenizer.end,
            &tokenizer.string[tokenizer.begin..tokenizer.end]
        );
    }
}