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-rw-r--r--src/app/cursor.rs51
1 files changed, 51 insertions, 0 deletions
diff --git a/src/app/cursor.rs b/src/app/cursor.rs
new file mode 100644
index 0000000..ed6bd65
--- /dev/null
+++ b/src/app/cursor.rs
@@ -0,0 +1,51 @@
1use chrono::{Duration, Local, NaiveDate};
2use cursive::direction::Absolute;
3
4#[derive(Debug, Copy, Clone)]
5pub struct Cursor(pub NaiveDate);
6
7impl std::default::Default for Cursor {
8 fn default() -> Self {
9 Cursor::new()
10 }
11}
12
13impl Cursor {
14 pub fn new() -> Self {
15 Cursor {
16 0: Local::now().naive_local().date(),
17 }
18 }
19 pub fn do_move(&mut self, d: Absolute) {
20 let today = Local::now().naive_local().date();
21 let cursor = self.0;
22 match d {
23 Absolute::Right => {
24 // forward by 1 day
25 let next = cursor.succ_opt().unwrap_or(cursor);
26 if next <= today {
27 self.0 = next;
28 }
29 }
30 Absolute::Left => {
31 // backward by 1 day
32 // assumes an infinite past
33 self.0 = cursor.pred_opt().unwrap_or(cursor);
34 }
35 Absolute::Down => {
36 // forward by 1 week
37 let next = cursor.checked_add_signed(Duration::weeks(1)).unwrap();
38 if next <= today {
39 self.0 = next;
40 }
41 }
42 Absolute::Up => {
43 // backward by 1 week
44 // assumes an infinite past
45 let next = cursor.checked_sub_signed(Duration::weeks(1)).unwrap();
46 self.0 = next;
47 }
48 Absolute::None => {}
49 }
50 }
51}