131 lines
3.9 KiB
Rust
131 lines
3.9 KiB
Rust
use crate::commands::math::utils::run_with_function;
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use crate::commands::WholeStreamCommand;
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use crate::prelude::*;
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use crate::utils::data_processing::{reducer_for, Reduce};
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use bigdecimal::{FromPrimitive, Zero};
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use nu_errors::ShellError;
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use nu_protocol::{
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hir::{convert_number_to_u64, Number, Operator},
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Primitive, Signature, UntaggedValue, Value,
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};
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pub struct SubCommand;
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#[async_trait]
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impl WholeStreamCommand for SubCommand {
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fn name(&self) -> &str {
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"math avg"
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}
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fn signature(&self) -> Signature {
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Signature::build("math avg")
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}
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fn usage(&self) -> &str {
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"Finds the average of a list of numbers or tables"
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}
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async fn run(
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&self,
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args: CommandArgs,
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registry: &CommandRegistry,
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) -> Result<OutputStream, ShellError> {
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run_with_function(
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RunnableContext {
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input: args.input,
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registry: registry.clone(),
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shell_manager: args.shell_manager,
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host: args.host,
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ctrl_c: args.ctrl_c,
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current_errors: args.current_errors,
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name: args.call_info.name_tag,
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raw_input: args.raw_input,
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},
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average,
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)
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.await
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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description: "Get the average of a list of numbers",
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example: "echo [-50 100.0 25] | math avg",
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result: Some(vec![UntaggedValue::decimal(25).into()]),
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}]
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}
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}
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pub fn average(values: &[Value], name: &Tag) -> Result<Value, ShellError> {
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let sum = reducer_for(Reduce::Summation);
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let number = BigDecimal::from_usize(values.len()).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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let total_rows = UntaggedValue::decimal(number);
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let total = sum(Value::zero(), values.to_vec())?;
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match total {
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Value {
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value: UntaggedValue::Primitive(Primitive::Filesize(num)),
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..
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} => {
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let left = UntaggedValue::from(Primitive::Int(num.into()));
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let result = crate::data::value::compute_values(Operator::Divide, &left, &total_rows);
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match result {
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Ok(UntaggedValue::Primitive(Primitive::Decimal(result))) => {
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let number = Number::Decimal(result);
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let number = convert_number_to_u64(&number);
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Ok(UntaggedValue::filesize(number).into_value(name))
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}
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Ok(_) => Err(ShellError::labeled_error(
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"could not calculate average of non-integer or unrelated types",
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"source",
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name,
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)),
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Err((left_type, right_type)) => Err(ShellError::coerce_error(
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left_type.spanned(name.span),
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right_type.spanned(name.span),
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)),
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}
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}
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Value {
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value: UntaggedValue::Primitive(other),
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..
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} => {
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let left = UntaggedValue::from(other);
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let result = crate::data::value::compute_values(Operator::Divide, &left, &total_rows);
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match result {
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Ok(value) => Ok(value.into_value(name)),
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Err((left_type, right_type)) => Err(ShellError::coerce_error(
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left_type.spanned(name.span),
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right_type.spanned(name.span),
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)),
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}
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}
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_ => Err(ShellError::labeled_error(
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"could not calculate average of non-integer or unrelated types",
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"source",
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name,
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)),
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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::SubCommand;
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#[test]
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fn examples_work_as_expected() {
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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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