use nu_cmd_base::input_handler::{operate, CmdArgument};
use nu_engine::CallExt;
use nu_protocol::ast::{Call, CellPath};
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{
Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value,
};
struct Arguments {
format_value: String,
float_precision: usize,
cell_paths: Option<Vec<CellPath>>,
}
impl CmdArgument for Arguments {
fn take_cell_paths(&mut self) -> Option<Vec<CellPath>> {
self.cell_paths.take()
}
}
#[derive(Clone)]
pub struct FormatDuration;
impl Command for FormatDuration {
fn name(&self) -> &str {
"format duration"
}
fn signature(&self) -> Signature {
Signature::build("format duration")
.input_output_types(vec![
(Type::Duration, Type::String),
(
Type::List(Box::new(Type::Duration)),
Type::List(Box::new(Type::String)),
),
(Type::Table(vec![]), Type::Table(vec![])),
])
.allow_variants_without_examples(true)
.required(
"format value",
SyntaxShape::String,
"The unit in which to display the duration.",
)
.rest(
"rest",
SyntaxShape::CellPath,
"For a data structure input, format duration at the given cell paths.",
)
.category(Category::Strings)
}
fn usage(&self) -> &str {
"Outputs duration with a specified unit of time."
}
fn search_terms(&self) -> Vec<&str> {
vec!["convert", "display", "pattern", "human readable"]
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<PipelineData, ShellError> {
let format_value = call
.req::<Value>(engine_state, stack, 0)?
.as_string()?
.to_ascii_lowercase();
let cell_paths: Vec<CellPath> = call.rest(engine_state, stack, 1)?;
let cell_paths = (!cell_paths.is_empty()).then_some(cell_paths);
let float_precision = engine_state.config.float_precision as usize;
let arg = Arguments {
format_value,
float_precision,
cell_paths,
};
operate(
format_value_impl,
arg,
input,
call.head,
engine_state.ctrlc.clone(),
)
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "Convert µs duration to the requested second duration as a string",
example: "1000000µs | format duration sec",
result: Some(Value::test_string("1 sec")),
},
Example {
description: "Convert durations to µs duration as strings",
example: "[1sec 2sec] | format duration µs",
result: Some(Value::test_list(vec![
Value::test_string("1000000 µs"),
Value::test_string("2000000 µs"),
])),
},
Example {
description: "Convert duration to µs as a string if unit asked for was us",
example: "1sec | format duration us",
result: Some(Value::test_string("1000000 µs")),
},
]
}
}
fn format_value_impl(val: &Value, arg: &Arguments, span: Span) -> Value {
let inner_span = val.span();
match val {
Value::Duration { val: inner, .. } => {
let duration = *inner;
let float_precision = arg.float_precision;
match convert_inner_to_unit(duration, &arg.format_value, span, inner_span) {
Ok(d) => {
let unit = if &arg.format_value == "us" {
"µs"
} else {
&arg.format_value
};
if d.fract() == 0.0 {
Value::string(format!("{} {}", d, unit), inner_span)
} else {
Value::string(format!("{:.float_precision$} {}", d, unit), inner_span)
}
}
Err(e) => Value::error(e, inner_span),
}
}
Value::Error { .. } => val.clone(),
_ => Value::error(
ShellError::OnlySupportsThisInputType {
exp_input_type: "filesize".into(),
wrong_type: val.get_type().to_string(),
dst_span: span,
src_span: val.span(),
},
span,
),
}
}
fn convert_inner_to_unit(
val: i64,
to_unit: &str,
span: Span,
value_span: Span,
) -> Result<f64, ShellError> {
match to_unit {
"ns" => Ok(val as f64),
"us" => Ok(val as f64 / 1000.0),
"µs" => Ok(val as f64 / 1000.0), "μs" => Ok(val as f64 / 1000.0), "ms" => Ok(val as f64 / 1000.0 / 1000.0),
"sec" => Ok(val as f64 / 1000.0 / 1000.0 / 1000.0),
"min" => Ok(val as f64 / 1000.0 / 1000.0 / 1000.0 / 60.0),
"hr" => Ok(val as f64 / 1000.0 / 1000.0 / 1000.0 / 60.0 / 60.0),
"day" => Ok(val as f64 / 1000.0 / 1000.0 / 1000.0 / 60.0 / 60.0 / 24.0),
"wk" => Ok(val as f64 / 1000.0 / 1000.0 / 1000.0 / 60.0 / 60.0 / 24.0 / 7.0),
"month" => Ok(val as f64 / 1000.0 / 1000.0 / 1000.0 / 60.0 / 60.0 / 24.0 / 30.0),
"yr" => Ok(val as f64 / 1000.0 / 1000.0 / 1000.0 / 60.0 / 60.0 / 24.0 / 365.0),
"dec" => Ok(val as f64 / 10.0 / 1000.0 / 1000.0 / 1000.0 / 60.0 / 60.0 / 24.0 / 365.0),
_ => Err(ShellError::CantConvertToDuration {
details: to_unit.to_string(),
dst_span: span,
src_span: value_span,
help: Some(
"supported units are ns, us/µs, ms, sec, min, hr, day, wk, month, yr, and dec"
.to_string(),
),
}),
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_examples() {
use crate::test_examples;
test_examples(FormatDuration)
}
}