use nu_engine::CallExt;
use nu_parser::parse_duration_bytes;
use nu_protocol::{
ast::{Call, CellPath, Expr},
engine::{Command, EngineState, Stack},
Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Unit, Value,
};
#[derive(Clone)]
pub struct SubCommand;
impl Command for SubCommand {
fn name(&self) -> &str {
"into duration"
}
fn signature(&self) -> Signature {
Signature::build("into duration")
.rest(
"rest",
SyntaxShape::CellPath,
"column paths to convert to duration (for table input)",
)
.category(Category::Conversions)
}
fn usage(&self) -> &str {
"Convert value to duration"
}
fn search_terms(&self) -> Vec<&str> {
vec!["convert", "time", "period"]
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
into_duration(engine_state, stack, call, input)
}
fn examples(&self) -> Vec<Example> {
let span = Span::test_data();
vec![
Example {
description: "Convert string to duration in table",
example: "echo [[value]; ['1sec'] ['2min'] ['3hr'] ['4day'] ['5wk']] | into duration value",
result: Some(Value::List {
vals: vec![
Value::Record {
cols: vec!["value".to_string()],
vals: vec![Value::Duration {
val: 1000 * 1000 * 1000,
span,
}],
span,
},
Value::Record {
cols: vec!["value".to_string()],
vals: vec![Value::Duration {
val: 2 * 60 * 1000 * 1000 * 1000,
span,
}],
span,
},
Value::Record {
cols: vec!["value".to_string()],
vals: vec![Value::Duration {
val: 3 * 60 * 60 * 1000 * 1000 * 1000,
span,
}],
span,
},
Value::Record {
cols: vec!["value".to_string()],
vals: vec![Value::Duration {
val: 4 * 24 * 60 * 60 * 1000 * 1000 * 1000,
span,
}],
span,
},
Value::Record {
cols: vec!["value".to_string()],
vals: vec![Value::Duration {
val: 5 * 7 * 24 * 60 * 60 * 1000 * 1000 * 1000,
span,
}],
span,
},
],
span,
}),
},
Example {
description: "Convert string to duration",
example: "'7min' | into duration",
result: Some(Value::Duration {
val: 7 * 60 * 1000 * 1000 * 1000,
span,
}),
},
]
}
}
fn into_duration(
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<PipelineData, ShellError> {
let head = call.head;
let column_paths: Vec<CellPath> = call.rest(engine_state, stack, 0)?;
input.map(
move |v| {
if column_paths.is_empty() {
action(&v, head)
} else {
let mut ret = v;
for path in &column_paths {
let r =
ret.update_cell_path(&path.members, Box::new(move |old| action(old, head)));
if let Err(error) = r {
return Value::Error { error };
}
}
ret
}
},
engine_state.ctrlc.clone(),
)
}
fn string_to_duration(s: &str, span: Span) -> Result<i64, ShellError> {
if let Some(expression) = parse_duration_bytes(s.as_bytes(), span) {
if let Expr::ValueWithUnit(value, unit) = expression.expr {
if let Expr::Int(x) = value.expr {
match unit.item {
Unit::Nanosecond => return Ok(x),
Unit::Microsecond => return Ok(x * 1000),
Unit::Millisecond => return Ok(x * 1000 * 1000),
Unit::Second => return Ok(x * 1000 * 1000 * 1000),
Unit::Minute => return Ok(x * 60 * 1000 * 1000 * 1000),
Unit::Hour => return Ok(x * 60 * 60 * 1000 * 1000 * 1000),
Unit::Day => return Ok(x * 24 * 60 * 60 * 1000 * 1000 * 1000),
Unit::Week => return Ok(x * 7 * 24 * 60 * 60 * 1000 * 1000 * 1000),
_ => {}
}
}
}
}
Err(ShellError::CantConvert(
"duration".to_string(),
"string".to_string(),
span,
Some("supported units are ns, us, ms, sec, min, hr, day, and wk".to_string()),
))
}
fn action(input: &Value, span: Span) -> Value {
match input {
Value::Duration { .. } => input.clone(),
Value::String { val, .. } => match string_to_duration(val, span) {
Ok(val) => Value::Duration { val, span },
Err(error) => Value::Error { error },
},
_ => Value::Error {
error: ShellError::UnsupportedInput(
"'into duration' does not support this input".into(),
span,
),
},
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_examples() {
use crate::test_examples;
test_examples(SubCommand {})
}
#[test]
fn turns_ns_to_duration() {
let span = Span::test_data();
let word = Value::test_string("3ns");
let expected = Value::Duration { val: 3, span };
let actual = action(&word, span);
assert_eq!(actual, expected);
}
#[test]
fn turns_us_to_duration() {
let span = Span::test_data();
let word = Value::test_string("4us");
let expected = Value::Duration {
val: 4 * 1000,
span,
};
let actual = action(&word, span);
assert_eq!(actual, expected);
}
#[test]
fn turns_ms_to_duration() {
let span = Span::test_data();
let word = Value::test_string("5ms");
let expected = Value::Duration {
val: 5 * 1000 * 1000,
span,
};
let actual = action(&word, span);
assert_eq!(actual, expected);
}
#[test]
fn turns_sec_to_duration() {
let span = Span::test_data();
let word = Value::test_string("1sec");
let expected = Value::Duration {
val: 1000 * 1000 * 1000,
span,
};
let actual = action(&word, span);
assert_eq!(actual, expected);
}
#[test]
fn turns_min_to_duration() {
let span = Span::test_data();
let word = Value::test_string("7min");
let expected = Value::Duration {
val: 7 * 60 * 1000 * 1000 * 1000,
span,
};
let actual = action(&word, span);
assert_eq!(actual, expected);
}
#[test]
fn turns_hr_to_duration() {
let span = Span::test_data();
let word = Value::test_string("42hr");
let expected = Value::Duration {
val: 42 * 60 * 60 * 1000 * 1000 * 1000,
span,
};
let actual = action(&word, span);
assert_eq!(actual, expected);
}
#[test]
fn turns_day_to_duration() {
let span = Span::test_data();
let word = Value::test_string("123day");
let expected = Value::Duration {
val: 123 * 24 * 60 * 60 * 1000 * 1000 * 1000,
span,
};
let actual = action(&word, span);
assert_eq!(actual, expected);
}
#[test]
fn turns_wk_to_duration() {
let span = Span::test_data();
let word = Value::test_string("3wk");
let expected = Value::Duration {
val: 3 * 7 * 24 * 60 * 60 * 1000 * 1000 * 1000,
span,
};
let actual = action(&word, span);
assert_eq!(actual, expected);
}
}