bezel-ui 0.1.18

SwiftUI-flavored components for gpui — popovers, menus, buttons, toggles, and loaders
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

use ui::date::*;

fn date(year: i32, month: u8, day: u8) -> Date {
    Date::new(year, month, day).expect("a real date")
}

#[test]
fn only_real_days_exist() {
    assert!(Date::new(2026, 2, 29).is_none());
    assert!(Date::new(2024, 2, 29).is_some());
    assert!(Date::new(2026, 0, 1).is_none());
    assert!(Date::new(2026, 13, 1).is_none());
    assert!(Date::new(2026, 4, 31).is_none());
    assert!(Date::new(2026, 1, 0).is_none());
}

#[test]
fn the_leap_rule_is_the_whole_rule() {
    // The century cases are the ones a wrong implementation gets wrong.
    assert!(!is_leap(1900));
    assert!(is_leap(2000));
    assert!(is_leap(2024));
    assert!(!is_leap(2026));
    assert_eq!(days_in_month(1900, 2), 28);
    assert_eq!(days_in_month(2000, 2), 29);
}

#[test]
fn days_and_dates_round_trip() {
    assert_eq!(date(1970, 1, 1).to_days(), 0);
    assert_eq!(Date::from_days(0), date(1970, 1, 1));
    // Before the epoch, where the sign handling in both directions bites.
    assert_eq!(date(1969, 12, 31).to_days(), -1);
    assert_eq!(Date::from_days(-1), date(1969, 12, 31));
    for date in [
        date(1, 1, 1),
        date(1900, 3, 1),
        date(1969, 7, 20),
        date(2000, 2, 29),
        date(2026, 8, 17),
        date(9999, 12, 31),
    ] {
        assert_eq!(Date::from_days(date.to_days()), date, "{date}");
    }
}

#[test]
fn weekdays_are_known_ones() {
    assert_eq!(date(1970, 1, 1).weekday(), Weekday::Thursday);
    assert_eq!(date(2000, 1, 1).weekday(), Weekday::Saturday);
    assert_eq!(date(2026, 8, 17).weekday(), Weekday::Monday);
    // Across the epoch, where a plain `%` would answer negative.
    assert_eq!(date(1969, 12, 31).weekday(), Weekday::Wednesday);
}

#[test]
fn adding_days_crosses_every_boundary() {
    assert_eq!(date(2026, 1, 31).add_days(1), date(2026, 2, 1));
    assert_eq!(date(2026, 12, 31).add_days(1), date(2027, 1, 1));
    assert_eq!(date(2027, 1, 1).add_days(-1), date(2026, 12, 31));
    assert_eq!(date(2024, 2, 28).add_days(1), date(2024, 2, 29));
    assert_eq!(date(2026, 2, 28).add_days(1), date(2026, 3, 1));
}

#[test]
fn adding_months_clamps_the_day() {
    // The case that makes month arithmetic its own operation.
    assert_eq!(date(2026, 1, 31).add_months(1), date(2026, 2, 28));
    assert_eq!(date(2024, 1, 31).add_months(1), date(2024, 2, 29));
    assert_eq!(date(2026, 3, 31).add_months(-1), date(2026, 2, 28));
    // Ordinary months keep the day, and the year moves with the count.
    assert_eq!(date(2026, 8, 17).add_months(1), date(2026, 9, 17));
    assert_eq!(date(2026, 12, 17).add_months(1), date(2027, 1, 17));
    assert_eq!(date(2026, 1, 17).add_months(-1), date(2025, 12, 17));
    assert_eq!(date(2026, 8, 17).add_months(-12), date(2025, 8, 17));
}

#[test]
fn a_week_starts_where_it_is_told() {
    assert_eq!(
        weekday_labels(Weekday::Monday),
        ["Mo", "Tu", "We", "Th", "Fr", "Sa", "Su"]
    );
    assert_eq!(
        weekday_labels(Weekday::Sunday),
        ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"]
    );
    assert_eq!(Weekday::Monday.offset_from(Weekday::Monday), 0);
    assert_eq!(Weekday::Sunday.offset_from(Weekday::Monday), 6);
    assert_eq!(Weekday::Monday.offset_from(Weekday::Sunday), 1);
}

#[test]
fn the_grid_opens_on_the_weeks_first_day() {
    // August 2026 starts on a Saturday: a Monday-start grid opens on
    // 27 July, a Sunday-start one on 26 July.
    let grid = month_grid(date(2026, 8, 17), Weekday::Monday);
    assert_eq!(grid[0], date(2026, 7, 27));
    assert_eq!(grid[0].weekday(), Weekday::Monday);
    let grid = month_grid(date(2026, 8, 17), Weekday::Sunday);
    assert_eq!(grid[0], date(2026, 7, 26));
    assert_eq!(grid[0].weekday(), Weekday::Sunday);
}

#[test]
fn the_grid_holds_every_day_of_its_month() {
    // Including the two extremes: a 28-day February starting on the week's
    // first day, and a 31-day month starting on its last.
    for month in [date(2026, 2, 1), date(2026, 8, 1), date(2021, 5, 1)] {
        for start in [Weekday::Monday, Weekday::Sunday] {
            let grid = month_grid(month, start);
            assert_eq!(grid.len(), GRID_CELLS);
            let held = grid
                .iter()
                .filter(|day| day.month() == month.month() && day.year() == month.year())
                .count();
            assert_eq!(
                held,
                days_in_month(month.year(), month.month()) as usize,
                "{month} missing days from its own grid"
            );
            // Consecutive, with no repeats or gaps at the month seams.
            for pair in grid.windows(2) {
                assert_eq!(pair[1], pair[0].add_days(1));
            }
        }
    }
}

#[test]
fn the_grid_never_changes_height() {
    // Six rows even for the shortest possible month, so the card cannot
    // resize under the pointer as you page.
    let february = month_grid(date(2021, 2, 1), Weekday::Monday);
    assert_eq!(february.len() / 7, GRID_ROWS);
    assert_eq!(february[0], date(2021, 2, 1));
}

#[test]
fn dates_are_written_unambiguously() {
    assert_eq!(date(2026, 8, 17).to_string(), "2026-08-17");
    assert_eq!(date(1, 1, 1).to_string(), "0001-01-01");
}