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use crate::evaluate::expr::run_expression_block;
use crate::evaluate::internal::run_internal_command;
use crate::evaluation_context::EvaluationContext;
use async_recursion::async_recursion;
use futures::stream::TryStreamExt;
use nu_errors::ShellError;
use nu_parser::ParserScope;
use nu_protocol::hir::{
Block, Call, ClassifiedCommand, Expression, Pipeline, SpannedExpression, Synthetic,
};
use nu_protocol::{ReturnSuccess, UntaggedValue, Value};
use nu_source::{Span, Tag};
use nu_stream::InputStream;
use nu_stream::ToOutputStream;
use std::sync::atomic::Ordering;
#[async_recursion]
pub async fn run_block(
block: &Block,
ctx: &EvaluationContext,
mut input: InputStream,
) -> Result<InputStream, ShellError> {
let mut output: Result<InputStream, ShellError> = Ok(InputStream::empty());
for (_, definition) in block.definitions.iter() {
ctx.scope.add_definition(definition.clone());
}
for group in &block.block {
match output {
Ok(inp) if inp.is_empty() => {}
Ok(inp) => {
// Run autoview on the values we've seen so far
// We may want to make this configurable for other kinds of hosting
if let Some(autoview) = ctx.get_command("autoview") {
let mut output_stream = match ctx
.run_command(
autoview,
Tag::unknown(),
Call::new(
Box::new(SpannedExpression::new(
Expression::Synthetic(Synthetic::String("autoview".into())),
Span::unknown(),
)),
Span::unknown(),
),
inp,
)
.await
{
Ok(x) => x,
Err(e) => {
return Err(e);
}
};
match output_stream.try_next().await {
Ok(Some(ReturnSuccess::Value(Value {
value: UntaggedValue::Error(e),
..
}))) => {
return Err(e);
}
Ok(Some(_item)) => {
if let Some(err) = ctx.get_errors().get(0) {
ctx.clear_errors();
return Err(err.clone());
}
if ctx.ctrl_c.load(Ordering::SeqCst) {
return Ok(InputStream::empty());
}
}
Ok(None) => {
if let Some(err) = ctx.get_errors().get(0) {
ctx.clear_errors();
return Err(err.clone());
}
}
Err(e) => {
return Err(e);
}
}
}
}
Err(e) => {
return Err(e);
}
}
output = Ok(InputStream::empty());
for pipeline in &group.pipelines {
match output {
Ok(inp) if inp.is_empty() => {}
Ok(inp) => {
let mut output_stream = inp.to_output_stream();
match output_stream.try_next().await {
Ok(Some(ReturnSuccess::Value(Value {
value: UntaggedValue::Error(e),
..
}))) => {
return Err(e);
}
Ok(Some(_item)) => {
if let Some(err) = ctx.get_errors().get(0) {
ctx.clear_errors();
return Err(err.clone());
}
if ctx.ctrl_c.load(Ordering::SeqCst) {
// This early return doesn't return the result
// we have so far, but breaking out of this loop
// causes lifetime issues. A future contribution
// could attempt to return the current output.
// https://github.com/nushell/nushell/pull/2830#discussion_r550319687
return Ok(InputStream::empty());
}
}
Ok(None) => {
if let Some(err) = ctx.get_errors().get(0) {
ctx.clear_errors();
return Err(err.clone());
}
}
Err(e) => {
return Err(e);
}
}
}
Err(e) => {
return Err(e);
}
}
output = run_pipeline(pipeline, ctx, input).await;
input = InputStream::empty();
}
}
output
}
#[async_recursion]
async fn run_pipeline(
commands: &Pipeline,
ctx: &EvaluationContext,
mut input: InputStream,
) -> Result<InputStream, ShellError> {
for item in commands.list.clone() {
input = match item {
ClassifiedCommand::Dynamic(call) => {
let mut args = vec![];
if let Some(positional) = call.positional {
for pos in &positional {
let result = run_expression_block(pos, ctx).await?.into_vec().await;
args.push(result);
}
}
match &call.head.expr {
Expression::Block(block) => {
ctx.scope.enter_scope();
for (param, value) in block.params.positional.iter().zip(args.iter()) {
ctx.scope.add_var(param.0.name(), value[0].clone());
}
let result = run_block(&block, ctx, input).await;
ctx.scope.exit_scope();
let result = result?;
return Ok(result);
}
Expression::Variable(v, span) => {
if let Some(value) = ctx.scope.get_var(v) {
match &value.value {
UntaggedValue::Block(captured_block) => {
ctx.scope.enter_scope();
ctx.scope.add_vars(&captured_block.captured.entries);
for (param, value) in captured_block
.block
.params
.positional
.iter()
.zip(args.iter())
{
ctx.scope.add_var(param.0.name(), value[0].clone());
}
let result = run_block(&captured_block.block, ctx, input).await;
ctx.scope.exit_scope();
let result = result?;
return Ok(result);
}
_ => {
return Err(ShellError::labeled_error("Dynamic commands must start with a block (or variable pointing to a block)", "needs to be a block", call.head.span));
}
}
} else {
return Err(ShellError::labeled_error(
"Variable not found",
"variable not found",
span,
));
}
}
_ => {
return Err(ShellError::labeled_error("Dynamic commands must start with a block (or variable pointing to a block)", "needs to be a block", call.head.span));
}
}
}
ClassifiedCommand::Expr(expr) => run_expression_block(&*expr, ctx).await?,
ClassifiedCommand::Error(err) => return Err(err.into()),
ClassifiedCommand::Internal(left) => run_internal_command(left, ctx, input).await?,
};
}
Ok(input)
}