blob: 786a4595b32212273a7909da5e09164c67052301 (
plain) (
blame)
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
|
/// Defines how to parse user confirmation input.
///
/// A type implementing this trait determines which user input strings are treated as "yes" or "no".
pub trait ConfirmPredicate {
/// Parses the user's input string, returning whether it is "yes".
///
/// Returns `Some(true)` for yes, `Some(false)` for no,
/// and `None` if the input cannot be parsed (requiring re-entry).
fn is_yes(str: &str) -> Option<bool>;
}
/// A `ConfirmPredicate` implementation that accepts "y"/"yes" as yes and "n"/"no" as no.
///
/// Input comparison is case-insensitive and automatically trims leading/trailing whitespace.
///
/// # Examples
///
/// ```
/// use mingling::res::ResConfirm;
/// use mingling::confirm::YesConfirm;
///
/// let confirm = ResConfirm::default();
/// let confirmed = confirm.ask::<YesConfirm>("Continue? [y/n] ");
/// ```
pub struct YesConfirm;
/// A `ConfirmPredicate` implementation that accepts "true"/"t" as yes and "false"/"f" as no.
///
/// Input comparison is case-insensitive and automatically trims leading/trailing whitespace.
///
/// # Examples
///
/// ```
/// use mingling::res::ResConfirm;
/// use mingling::confirm::TrueConfirm;
///
/// let confirm = ResConfirm::default();
/// let confirmed = confirm.ask::<TrueConfirm>("Enable this feature? [true/false] ");
/// ```
pub struct TrueConfirm;
impl ConfirmPredicate for YesConfirm {
fn is_yes(str: &str) -> Option<bool> {
match str.trim().to_lowercase().as_str() {
"y" | "yes" => Some(true),
"n" | "no" => Some(false),
_ => None,
}
}
}
impl ConfirmPredicate for TrueConfirm {
fn is_yes(str: &str) -> Option<bool> {
match str.trim().to_lowercase().as_str() {
"true" | "t" => Some(true),
"false" | "f" => Some(false),
_ => None,
}
}
}
|
