forked from extern/nushell
118 lines
3.5 KiB
Rust
118 lines
3.5 KiB
Rust
use crate::commands::math::reducers::{reducer_for, Reduce};
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use crate::commands::math::utils::run_with_function;
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use crate::prelude::*;
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use nu_engine::WholeStreamCommand;
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use nu_errors::ShellError;
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use nu_protocol::{Primitive, Signature, UntaggedValue, Value};
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pub struct SubCommand;
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impl WholeStreamCommand for SubCommand {
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fn name(&self) -> &str {
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"math sum"
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}
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fn signature(&self) -> Signature {
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Signature::build("math sum")
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}
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fn usage(&self) -> &str {
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"Finds the sum of a list of numbers or tables"
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}
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fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
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run_with_function(args, summation)
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}
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fn examples(&self) -> Vec<Example> {
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vec![
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Example {
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description: "Sum a list of numbers",
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example: "echo [1 2 3] | math sum",
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result: Some(vec![UntaggedValue::int(6).into()]),
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},
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Example {
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description: "Get the disk usage for the current directory",
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example: "ls --all --du | get size | math sum",
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result: None,
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},
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]
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}
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}
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fn to_byte(value: &Value) -> Option<Value> {
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match &value.value {
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UntaggedValue::Primitive(Primitive::Int(num)) => {
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Some(UntaggedValue::Primitive(Primitive::Filesize(*num as u64)).into_untagged_value())
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}
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_ => None,
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}
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}
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pub fn summation(values: &[Value], name: &Tag) -> Result<Value, ShellError> {
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let sum = reducer_for(Reduce::Summation);
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let first = values.get(0).ok_or_else(|| {
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ShellError::labeled_error(
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"Cannot perform aggregate math operation on empty data",
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"expected input",
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name.span,
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)
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})?;
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match first {
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v if v.is_filesize() => to_byte(&sum(
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UntaggedValue::int(0).into_untagged_value(),
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values
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.to_vec()
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.iter()
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.map(|v| match v {
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Value {
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value: UntaggedValue::Primitive(Primitive::Filesize(num)),
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..
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} => UntaggedValue::int(*num as i64).into_untagged_value(),
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other => other.clone(),
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})
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.collect::<Vec<_>>(),
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)?)
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.ok_or_else(|| {
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ShellError::labeled_error(
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"could not convert to big decimal",
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"could not convert to big decimal",
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&name.span,
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)
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}),
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v if v.is_duration() => sum(UntaggedValue::int(0).into_untagged_value(), values.to_vec()),
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// v is nothing primitive
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v if v.is_none() => sum(
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UntaggedValue::int(0).into_untagged_value(),
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values
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.to_vec()
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.iter()
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.map(|v| match v {
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Value {
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value: UntaggedValue::Primitive(Primitive::Nothing),
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..
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} => UntaggedValue::int(0).into_untagged_value(),
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other => other.clone(),
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})
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.collect::<Vec<_>>(),
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),
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_ => sum(UntaggedValue::int(0).into_untagged_value(), values.to_vec()),
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}
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}
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#[cfg(test)]
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mod tests {
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use super::ShellError;
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use super::SubCommand;
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#[test]
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fn examples_work_as_expected() -> Result<(), ShellError> {
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use crate::examples::test as test_examples;
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test_examples(SubCommand {})
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}
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}
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