cyndikator 0.1.0

A cli rss reader
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

use crossterm::{
    event::{Event, KeyCode, KeyEvent},
    Result,
};

use super::Action;

pub struct Inter {
    pub height: u16,
    pub offset: u16,
    pub base: u32,
    pub mag: String,
}

impl Inter {
    pub fn new(height: u16, base: u32) -> Inter {
        let offset = 0;
        let mag = String::new();

        Inter {
            offset,
            height,
            base,
            mag,
        }
    }

    pub fn interact(&mut self, event: &Event) -> Result<Action> {
        match event {
            Event::Key(ke) => return self.inter_key(ke),

            Event::Resize(_, height) => self.height = *height,

            _ => (),
        };

        Ok(Action::Noop)
    }

    fn inter_key(&mut self, event: &KeyEvent) -> Result<Action> {
        let mag = self.mag.parse::<u16>().ok();

        match event.code {
            KeyCode::Char('q') => return Ok(Action::Quit),
            KeyCode::Char('j') | KeyCode::Down => {
                self.move_down(mag.unwrap_or(1));
                self.mag.clear();
            }

            KeyCode::Char('k') | KeyCode::Up => {
                self.move_up(mag.unwrap_or(1));
                self.mag.clear();
            }

            KeyCode::Char('g') => {
                self.goto(mag.unwrap_or(1) as u32);
                self.mag.clear();
            }

            KeyCode::Char('G') => {
                self.offset = mag
                    .map(|i| i.checked_sub(1).unwrap_or(1))
                    .unwrap_or(u16::MAX);
                self.mag.clear();
            }

            KeyCode::Char('d') => {
                self.move_down(mag.unwrap_or(1) * self.height / 2);
                self.mag.clear();
            }

            KeyCode::Char('u') => {
                self.move_up(mag.unwrap_or(1) * self.height / 2);
                self.mag.clear();
            }

            KeyCode::Char('f') => {
                self.move_down(mag.unwrap_or(1) * self.height);
                self.mag.clear();
            }

            KeyCode::Char('b') => {
                self.move_up(mag.unwrap_or(1) * self.height);
                self.mag.clear();
            }

            KeyCode::Char('D') => {
                self.mag.clear();
                return Ok(Action::Delete);
            }

            KeyCode::Char('U') => {
                self.mag.clear();
                return Ok(Action::Undo);
            }

            KeyCode::Char(ch) if ('0'..='9').contains(&ch) => {
                self.mag.push(ch);
            }

            KeyCode::Enter => {
                self.mag.clear();
                return Ok(Action::Open);
            }

            _ => (),
        };

        Ok(Action::Noop)
    }

    fn move_down(&mut self, amount: u16) {
        self.offset += amount;

        if self.offset >= self.height {
            self.base += (self.offset - self.height + 1) as u32;
            self.offset = self.height - 1;
        }
    }

    fn move_up(&mut self, amount: u16) {
        let diff = if amount > self.offset {
            amount - self.offset
        } else {
            0
        };

        self.offset = self.offset.checked_sub(amount).unwrap_or(0);
        self.base = self.base.checked_sub(diff as u32).unwrap_or(0);
    }

    fn goto(&mut self, line: u32) {
        let adjusted = line.checked_sub(1).unwrap_or(0);

        if adjusted < self.base {
            self.base = adjusted;
            self.offset = 0;
        } else {
            self.offset = (adjusted - self.base) as u16;
        }
    }
}