2020-03-19 00:46:00 +01:00
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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 nu_errors::ShellError;
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2020-05-24 02:08:39 +02:00
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use nu_protocol::{Dictionary, ReturnSuccess, ReturnValue, Signature, UntaggedValue, Value};
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2020-03-19 00:46:00 +01:00
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use num_traits::identities::Zero;
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2020-05-24 02:08:39 +02:00
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use indexmap::map::IndexMap;
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2020-03-19 00:46:00 +01:00
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pub struct Sum;
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2020-05-29 10:22:52 +02:00
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#[async_trait]
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2020-03-19 00:46:00 +01:00
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impl WholeStreamCommand for Sum {
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fn name(&self) -> &str {
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"sum"
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}
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fn signature(&self) -> Signature {
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Signature::build("sum")
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}
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fn usage(&self) -> &str {
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"Sums the values."
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}
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2020-05-29 10:22:52 +02:00
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async fn run(
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2020-03-19 00:46:00 +01:00
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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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sum(RunnableContext {
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input: args.input,
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Move external closer to internal (#1611)
* Refactor InputStream and affected commands.
First, making `values` private and leaning on the `Stream` implementation makes
consumes of `InputStream` less likely to have to change in the future, if we
change what an `InputStream` is internally.
Second, we're dropping `Option<InputStream>` as the input to pipelines,
internals, and externals. Instead, `InputStream.is_empty` can be used to check
for "emptiness". Empty streams are typically only ever used as the first input
to a pipeline.
* Add run_external internal command.
We want to push external commands closer to internal commands, eventually
eliminating the concept of "external" completely. This means we can consolidate
a couple of things:
- Variable evaluation (for example, `$it`, `$nu`, alias vars)
- Behaviour of whole stream vs per-item external execution
It should also make it easier for us to start introducing argument signatures
for external commands,
* Update run_external.rs
* Update run_external.rs
* Update run_external.rs
* Update run_external.rs
Co-authored-by: Jonathan Turner <jonathandturner@users.noreply.github.com>
2020-04-20 05:30:44 +02:00
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registry: registry.clone(),
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2020-03-19 00:46:00 +01:00
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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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2020-05-30 20:31:50 +02:00
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current_errors: args.current_errors,
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2020-03-19 00:46:00 +01:00
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name: args.call_info.name_tag,
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2020-05-20 19:31:04 +02:00
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raw_input: args.raw_input,
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2020-03-19 00:46:00 +01:00
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})
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}
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2020-05-12 17:54:29 +02:00
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2020-05-18 14:56:01 +02:00
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fn examples(&self) -> Vec<Example> {
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vec![
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2020-05-12 17:54:29 +02:00
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Example {
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description: "Sum a list of numbers",
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example: "echo [1 2 3] | sum",
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2020-05-18 14:56:01 +02:00
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result: Some(vec![UntaggedValue::int(6).into()]),
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2020-05-12 17:54:29 +02:00
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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 | sum",
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2020-05-18 14:56:01 +02:00
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result: None,
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2020-05-12 17:54:29 +02:00
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},
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]
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}
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2020-03-19 00:46:00 +01:00
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}
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fn sum(RunnableContext { mut input, .. }: RunnableContext) -> Result<OutputStream, ShellError> {
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let stream = async_stream! {
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2020-05-24 02:08:39 +02:00
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let mut values: Vec<Value> = input.drain_vec().await;
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2020-03-19 00:46:00 +01:00
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let action = reducer_for(Reduce::Sum);
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2020-05-24 02:08:39 +02:00
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if values.iter().all(|v| if let UntaggedValue::Primitive(_) = v.value {true} else {false}) {
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let total = action(Value::zero(), values)?;
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yield ReturnSuccess::value(total)
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} else {
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let mut column_values = IndexMap::new();
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for value in values {
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match value.value {
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UntaggedValue::Row(row_dict) => {
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for (key, value) in row_dict.entries.iter() {
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column_values
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.entry(key.clone())
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.and_modify(|v: &mut Vec<Value>| v.push(value.clone()))
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.or_insert(vec![value.clone()]);
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}
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},
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table => {},
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};
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}
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let mut column_totals = IndexMap::new();
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for (col_name, col_vals) in column_values {
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let sum = action(Value::zero(), col_vals);
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match sum {
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Ok(value) => {
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column_totals.insert(col_name, value);
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},
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Err(err) => yield Err(err),
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};
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}
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yield ReturnSuccess::value(
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UntaggedValue::Row(Dictionary {entries: column_totals}).into_untagged_value())
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2020-03-19 00:46:00 +01:00
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}
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};
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let stream: BoxStream<'static, ReturnValue> = stream.boxed();
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Ok(stream.to_output_stream())
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}
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2020-05-18 14:56:01 +02:00
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#[cfg(test)]
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mod tests {
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use super::Sum;
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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(Sum {})
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}
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}
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