forked from nushell/nushell
-
Notifications
You must be signed in to change notification settings - Fork 0
/
reverse.rs
85 lines (74 loc) · 2.23 KB
/
reverse.rs
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
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{
record, Category, Example, IntoInterruptiblePipelineData, PipelineData, ShellError, Signature,
Type, Value,
};
#[derive(Clone)]
pub struct Reverse;
impl Command for Reverse {
fn name(&self) -> &str {
"reverse"
}
fn signature(&self) -> nu_protocol::Signature {
Signature::build("reverse")
.input_output_types(vec![(
Type::List(Box::new(Type::Any)),
Type::List(Box::new(Type::Any)),
)])
.category(Category::Filters)
}
fn usage(&self) -> &str {
"Reverses the input list or table."
}
fn search_terms(&self) -> Vec<&str> {
vec!["convert, inverse, flip"]
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
example: "[0,1,2,3] | reverse",
description: "Reverse a list",
result: Some(Value::test_list(vec![
Value::test_int(3),
Value::test_int(2),
Value::test_int(1),
Value::test_int(0),
])),
},
Example {
example: "[{a: 1} {a: 2}] | reverse",
description: "Reverse a table",
result: Some(Value::test_list(vec![
Value::test_record(record! {
"a" => Value::test_int(2),
}),
Value::test_record(record! {
"a" => Value::test_int(1),
}),
])),
},
]
}
fn run(
&self,
engine_state: &EngineState,
_stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<PipelineData, ShellError> {
let metadata = input.metadata();
let v: Vec<_> = input.into_iter_strict(call.head)?.collect();
let iter = v.into_iter().rev();
Ok(iter.into_pipeline_data_with_metadata(metadata, engine_state.ctrlc.clone()))
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_examples() {
use crate::test_examples;
test_examples(Reverse {})
}
}