broot/command/
sel.rs

1/// compute a new selection index for the given list len,
2/// taking into account whether we should cycle or not
3pub fn move_sel(
4    selection: usize,
5    len: usize,
6    d: i32, // displacement
7    cycle: bool,
8) -> usize {
9    if len == 0 {
10        return 0;
11    }
12    let ns = (selection as i32) + d;
13    if ns < 0 {
14        if cycle { len - 1 } else { 0 }
15    } else if ns >= len as i32 {
16        if cycle { 0 } else { len - 1 }
17    } else {
18        ns as usize
19    }
20}