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use crate::evaluate::expr::run_expression_block;
use crate::evaluate::internal::run_internal_command;
use crate::evaluation_context::EvaluationContext;
use nu_errors::ShellError;
use nu_parser::ParserScope;
use nu_protocol::hir::{
Block, Call, ClassifiedCommand, Expression, ExternalRedirection, Pipeline, SpannedExpression,
Synthetic,
};
use nu_protocol::{UntaggedValue, Value};
use nu_source::{Span, Tag};
use nu_stream::{InputStream, OutputStream};
use std::sync::atomic::Ordering;
pub fn run_block(
block: &Block,
ctx: &EvaluationContext,
mut input: InputStream,
external_redirection: ExternalRedirection,
) -> Result<OutputStream, ShellError> {
let mut output: Result<InputStream, ShellError> = Ok(OutputStream::empty());
for (_, definition) in block.definitions.iter() {
ctx.scope.add_definition(definition.clone());
}
let num_groups = block.block.len();
for (group_num, group) in block.block.iter().enumerate() {
match output {
Ok(inp) if inp.is_empty() => {}
Ok(inp) => {
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,
) {
Ok(x) => x,
Err(e) => {
return Err(e);
}
};
match output_stream.next() {
Some(Value {
value: UntaggedValue::Error(e),
..
}) => {
return Err(e);
}
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());
}
}
None => {
if let Some(err) = ctx.get_errors().get(0) {
ctx.clear_errors();
return Err(err.clone());
}
}
}
}
}
Err(e) => {
return Err(e);
}
}
output = Ok(OutputStream::empty());
let num_pipelines = group.pipelines.len();
for (pipeline_num, pipeline) in group.pipelines.iter().enumerate() {
match output {
Ok(inp) if inp.is_empty() => {}
Ok(mut output_stream) => {
match output_stream.next() {
Some(Value {
value: UntaggedValue::Error(e),
..
}) => {
return Err(e);
}
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());
}
}
None => {
if let Some(err) = ctx.get_errors().get(0) {
ctx.clear_errors();
return Err(err.clone());
}
}
}
}
Err(e) => {
return Err(e);
}
}
output = if group_num == (num_groups - 1) && pipeline_num == (num_pipelines - 1) {
run_pipeline(pipeline, ctx, input, external_redirection)
} else {
run_pipeline(pipeline, ctx, input, ExternalRedirection::Stdout)
};
input = OutputStream::empty();
}
}
output
}
fn run_pipeline(
commands: &Pipeline,
ctx: &EvaluationContext,
mut input: InputStream,
external_redirection: ExternalRedirection,
) -> Result<OutputStream, ShellError> {
let num_commands = commands.list.len();
for (command_num, command) in commands.list.iter().enumerate() {
input = match command {
ClassifiedCommand::Dynamic(call) => {
let mut args = vec![];
if let Some(positional) = &call.positional {
for pos in positional {
let result = run_expression_block(pos, ctx)?.into_vec();
args.push(result);
}
}
let block = run_expression_block(&call.head, ctx)?.into_vec();
if block.len() != 1 {
return Err(ShellError::labeled_error(
"Dynamic commands must start with a block",
"needs to be a block",
call.head.span,
));
}
match &block[0].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, external_redirection);
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));
}
}
}
ClassifiedCommand::Expr(expr) => run_expression_block(&*expr, ctx)?,
ClassifiedCommand::Error(err) => return Err(err.clone().into()),
ClassifiedCommand::Internal(left) => {
if command_num == (num_commands - 1) {
let mut left = left.clone();
left.args.external_redirection = external_redirection;
run_internal_command(&left, ctx, input)?
} else {
run_internal_command(left, ctx, input)?
}
}
};
}
Ok(input)
}