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Add a simple parallel each

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This commit is contained in:
JT 2021-10-26 14:30:53 +13:00
parent 798552b1b3
commit 5455270446
6 changed files with 265 additions and 0 deletions
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1
Cargo.lock generated
View file

@ -608,6 +608,7 @@ dependencies = [
"nu-protocol",
"nu-table",
"nu-term-grid",
"rayon",
"sysinfo",
"terminal_size",
"thiserror",

1
crates/nu-command/Cargo.toml
View file

@ -26,6 +26,7 @@ terminal_size = "0.1.17"
lscolors = { version = "0.8.0", features = ["crossterm"] }
bytesize = "1.1.0"
dialoguer = "0.9.0"
rayon = "1.5.1"
[features]
trash-support = ["trash"]

1
crates/nu-command/src/default_context.rs
View file

@ -51,6 +51,7 @@ pub fn create_default_context() -> EngineState {
Mkdir,
Module,
Mv,
ParEach,
Ps,
Rm,
Select,

2
crates/nu-command/src/filters/mod.rs
View file

@ -2,6 +2,7 @@ mod each;
mod get;
mod length;
mod lines;
mod par_each;
mod select;
mod where_;
mod wrap;
@ -10,6 +11,7 @@ pub use each::Each;
pub use get::Get;
pub use length::Length;
pub use lines::Lines;
pub use par_each::ParEach;
pub use select::Select;
pub use where_::Where;
pub use wrap::Wrap;

252
crates/nu-command/src/filters/par_each.rs Normal file
View file

@ -0,0 +1,252 @@
use nu_engine::eval_block;
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{Example, IntoPipelineData, PipelineData, Signature, SyntaxShape, Value};
use rayon::prelude::*;
#[derive(Clone)]
pub struct ParEach;
impl Command for ParEach {
fn name(&self) -> &str {
"par-each"
}
fn usage(&self) -> &str {
"Run a block on each element of input in parallel"
}
fn signature(&self) -> nu_protocol::Signature {
Signature::build("each")
.required(
"block",
SyntaxShape::Block(Some(vec![SyntaxShape::Any])),
"the block to run",
)
.switch("numbered", "iterate with an index", Some('n'))
}
fn examples(&self) -> Vec<Example> {
vec![Example {
example: "[1 2 3] | each { 2 * $it }",
description: "Multiplies elements in list",
result: None,
}]
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
let block_id = call.positional[0]
.as_block()
.expect("internal error: expected block");
let numbered = call.has_flag("numbered");
let engine_state = engine_state.clone();
let block = engine_state.get_block(block_id);
let mut stack = stack.collect_captures(&block.captures);
let span = call.head;
match input {
PipelineData::Value(Value::Range { val, .. }) => Ok(val
.into_range_iter()?
.enumerate()
.par_bridge()
.map(move |(idx, x)| {
let block = engine_state.get_block(block_id);
let mut stack = stack.clone();
if let Some(var) = block.signature.get_positional(0) {
if let Some(var_id) = &var.var_id {
if numbered {
stack.add_var(
*var_id,
Value::Record {
cols: vec!["index".into(), "item".into()],
vals: vec![
Value::Int {
val: idx as i64,
span,
},
x,
],
span,
},
);
} else {
stack.add_var(*var_id, x);
}
}
}
match eval_block(&engine_state, &mut stack, block, PipelineData::new()) {
Ok(v) => v,
Err(error) => Value::Error { error }.into_pipeline_data(),
}
})
.collect::<Vec<_>>()
.into_iter()
.flatten()
.into_pipeline_data()),
PipelineData::Value(Value::List { vals: val, .. }) => Ok(val
.into_iter()
.enumerate()
.par_bridge()
.map(move |(idx, x)| {
let block = engine_state.get_block(block_id);
let mut stack = stack.clone();
if let Some(var) = block.signature.get_positional(0) {
if let Some(var_id) = &var.var_id {
if numbered {
stack.add_var(
*var_id,
Value::Record {
cols: vec!["index".into(), "item".into()],
vals: vec![
Value::Int {
val: idx as i64,
span,
},
x,
],
span,
},
);
} else {
stack.add_var(*var_id, x);
}
}
}
match eval_block(&engine_state, &mut stack, block, PipelineData::new()) {
Ok(v) => v,
Err(error) => Value::Error { error }.into_pipeline_data(),
}
})
.collect::<Vec<_>>()
.into_iter()
.flatten()
.into_pipeline_data()),
PipelineData::Stream(stream) => Ok(stream
.enumerate()
.par_bridge()
.map(move |(idx, x)| {
let block = engine_state.get_block(block_id);
let mut stack = stack.clone();
if let Some(var) = block.signature.get_positional(0) {
if let Some(var_id) = &var.var_id {
if numbered {
stack.add_var(
*var_id,
Value::Record {
cols: vec!["index".into(), "item".into()],
vals: vec![
Value::Int {
val: idx as i64,
span,
},
x,
],
span,
},
);
} else {
stack.add_var(*var_id, x);
}
}
}
match eval_block(&engine_state, &mut stack, block, PipelineData::new()) {
Ok(v) => v,
Err(error) => Value::Error { error }.into_pipeline_data(),
}
})
.collect::<Vec<_>>()
.into_iter()
.flatten()
.into_pipeline_data()),
PipelineData::Value(Value::Record { cols, vals, .. }) => {
let mut output_cols = vec![];
let mut output_vals = vec![];
for (col, val) in cols.into_iter().zip(vals.into_iter()) {
let block = engine_state.get_block(block_id);
let mut stack = stack.clone();
if let Some(var) = block.signature.get_positional(0) {
if let Some(var_id) = &var.var_id {
stack.add_var(
*var_id,
Value::Record {
cols: vec!["column".into(), "value".into()],
vals: vec![
Value::String {
val: col.clone(),
span: call.head,
},
val,
],
span: call.head,
},
);
}
}
match eval_block(&engine_state, &mut stack, block, PipelineData::new())? {
PipelineData::Value(Value::Record {
mut cols, mut vals, ..
}) => {
// TODO check that the lengths match when traversing record
output_cols.append(&mut cols);
output_vals.append(&mut vals);
}
x => {
output_cols.push(col);
output_vals.push(x.into_value());
}
}
}
Ok(Value::Record {
cols: output_cols,
vals: output_vals,
span: call.head,
}
.into_pipeline_data())
}
PipelineData::Value(x) => {
let block = engine_state.get_block(block_id);
if let Some(var) = block.signature.get_positional(0) {
if let Some(var_id) = &var.var_id {
stack.add_var(*var_id, x);
}
}
eval_block(&engine_state, &mut stack, block, PipelineData::new())
}
}
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_examples() {
use crate::test_examples;
test_examples(ParEach {})
}
}

8
src/tests.rs
View file

@ -621,6 +621,14 @@ fn for_loops() -> TestResult {
run_test(r#"(for x in [1, 2, 3] { $x + 10 }).1"#, "12")
}
#[test]
fn par_each() -> TestResult {
run_test(
r#"1..10 | par-each --numbered { ([[index, item]; [$it.index, ($it.item > 5)]]).0 } | where index == 4 | get item.0"#,
"false",
)
}
#[test]
fn type_in_list_of_this_type() -> TestResult {
run_test(r#"42 in [41 42 43]"#, "true")