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Support redirect stderr and stdout+stderr with a pipe (#11708)

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# Description
Close: #9673
Close: #8277
Close: #10944

This pr introduces the following syntax:
1. `e>|`, pipe stderr to next command. Example: `$env.FOO=bar nu
--testbin echo_env_stderr FOO e>| str length`
2. `o+e>|` and `e+o>|`, pipe both stdout and stderr to next command,
example: `$env.FOO=bar nu --testbin echo_env_mixed out-err FOO FOO e+o>|
str length`

Note: it only works for external commands. ~There is no different for
internal commands, that is, the following three commands do the same
things:~ Edit: it raises errors if we want to pipes for internal
commands
``` 
❯ ls e>| str length
Error:   × `e>|` only works with external streams
   ╭─[entry #1:1:1]
 1 │ ls e>| str length
   ·    ─┬─
   ·     ╰── `e>|` only works on external streams
   ╰────

❯ ls e+o>| str length
Error:   × `o+e>|` only works with external streams
   ╭─[entry #2:1:1]
 1 │ ls e+o>| str length
   ·    ──┬──
   ·      ╰── `o+e>|` only works on external streams
   ╰────
```

This can help us to avoid some strange issues like the following:

`$env.FOO=bar (nu --testbin echo_env_stderr FOO) e>| str length`

Which is hard to understand and hard to explain to users.

# User-Facing Changes
Nan

# Tests + Formatting
To be done

# After Submitting
Maybe update documentation about these syntax.
This commit is contained in:
Wind
2024-02-09 01:30:46 +08:00
committed by GitHub
parent e7f1bf8535
commit 58c6fea60b
15 changed files with 520 additions and 106 deletions
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2
crates/nu-protocol/src/ast/block.rs
View File

@ -68,6 +68,8 @@ impl Block {
if let Some(last) = last.elements.last() {
match last {
PipelineElement::Expression(_, expr) => expr.ty.clone(),
PipelineElement::ErrPipedExpression(_, expr) => expr.ty.clone(),
PipelineElement::OutErrPipedExpression(_, expr) => expr.ty.clone(),
PipelineElement::Redirection(_, _, _, _) => Type::Any,
PipelineElement::SeparateRedirection { .. } => Type::Any,
PipelineElement::SameTargetRedirection { .. } => Type::Any,

14
crates/nu-protocol/src/ast/pipeline.rs
View File

@ -13,6 +13,8 @@ pub enum Redirection {
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum PipelineElement {
Expression(Option<Span>, Expression),
ErrPipedExpression(Option<Span>, Expression),
OutErrPipedExpression(Option<Span>, Expression),
// final field indicates if it's in append mode
Redirection(Span, Redirection, Expression, bool),
// final bool field indicates if it's in append mode
@ -32,7 +34,9 @@ pub enum PipelineElement {
impl PipelineElement {
pub fn expression(&self) -> &Expression {
match self {
PipelineElement::Expression(_, expression) => expression,
PipelineElement::Expression(_, expression)
| PipelineElement::ErrPipedExpression(_, expression)
| PipelineElement::OutErrPipedExpression(_, expression) => expression,
PipelineElement::Redirection(_, _, expression, _) => expression,
PipelineElement::SeparateRedirection {
out: (_, expression, _),
@ -50,11 +54,15 @@ impl PipelineElement {
pub fn span(&self) -> Span {
match self {
PipelineElement::Expression(None, expression)
| PipelineElement::ErrPipedExpression(None, expression)
| PipelineElement::OutErrPipedExpression(None, expression)
| PipelineElement::SameTargetRedirection {
cmd: (None, expression),
..
} => expression.span,
PipelineElement::Expression(Some(span), expression)
| PipelineElement::ErrPipedExpression(Some(span), expression)
| PipelineElement::OutErrPipedExpression(Some(span), expression)
| PipelineElement::Redirection(span, _, expression, _)
| PipelineElement::SeparateRedirection {
out: (span, expression, _),
@ -74,6 +82,8 @@ impl PipelineElement {
pub fn has_in_variable(&self, working_set: &StateWorkingSet) -> bool {
match self {
PipelineElement::Expression(_, expression)
| PipelineElement::ErrPipedExpression(_, expression)
| PipelineElement::OutErrPipedExpression(_, expression)
| PipelineElement::Redirection(_, _, expression, _)
| PipelineElement::And(_, expression)
| PipelineElement::Or(_, expression)
@ -96,6 +106,8 @@ impl PipelineElement {
) {
match self {
PipelineElement::Expression(_, expression)
| PipelineElement::ErrPipedExpression(_, expression)
| PipelineElement::OutErrPipedExpression(_, expression)
| PipelineElement::Redirection(_, _, expression, _)
| PipelineElement::And(_, expression)
| PipelineElement::Or(_, expression)