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Properly evaluate dynamic blocks (#3339)

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JT 2021-04-21 14:31:54 +12:00 committed by GitHub
parent ce35689d2e
commit 02d5729941
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2 changed files with 32 additions and 37 deletions
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58
crates/nu-engine/src/evaluate/block.rs
View file

@ -137,51 +137,35 @@ fn run_pipeline(
}
}
match &call.head.expr {
Expression::Block(block) => {
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();
for (param, value) in block.params.positional.iter().zip(args.iter()) {
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(&block, ctx, input);
let result = run_block(&captured_block.block, ctx, input);
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);
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));
}

11
tests/shell/pipeline/commands/internal.rs
View file

@ -391,6 +391,17 @@ fn proper_shadow_set_aliases() {
assert_eq!(actual.out, "falsetruefalse");
}
#[test]
fn run_dynamic_blocks() {
let actual = nu!(
cwd: ".",
r#"
let block = { echo "holaaaa" }; $block
"#
);
assert_eq!(actual.out, "holaaaa");
}
#[cfg(feature = "which")]
#[test]
fn argument_invocation_reports_errors() {