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
pub enum Command {
Push(String),
Pop(usize),
PopLast,
Continue(usize),
Edit(usize),
EditLast,
EditReminders,
Get(usize),
GetLast,
Remind(usize),
RemindLast,
}
impl<'a> Command {
pub fn from<I>(mut statement: I) -> Option<Self>
where
I: Iterator<Item = &'a str>,
{
match statement.next() {
Some("g") | Some("get") => statement.next().map_or(Some(Self::GetLast), |arg| {
arg.parse::<usize>()
.map_or(None, |num| Some(Self::Get(num)))
}),
Some("p") | Some("pop") => statement.next().map_or(Some(Self::PopLast), |arg| {
arg.parse::<usize>()
.map_or(None, |num| Some(Self::Pop(num)))
}),
Some("r") | Some("remind") => statement.next().map_or(Some(Self::RemindLast), |arg| {
arg.parse::<usize>()
.map_or(None, |num| Some(Self::Remind(num)))
}),
Some("e") | Some("edit") => {
statement
.next()
.map_or(Some(Self::EditLast), |arg| match arg {
"r" | "reminders" => Some(Self::EditReminders),
arg => arg
.parse::<usize>()
.map_or(None, |num| Some(Self::Edit(num))),
})
}
Some(arg) => arg
.parse::<usize>()
.map_or(None, |num| Some(Self::Continue(num))),
_ => None,
}
}
}