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Avoid blocking when o+e> redirects too much stderr message (#8784)

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# Description

Fixes: #8565

Here is another pr #7240 tried to address the issue, but it works in a
wrong way.

After this change `o+e>` won't redirect all stdout message then stderr
message and it works more like how bash does.

# User-Facing Changes

For the given python code:
```python
# test.py
import sys

print('aa'*300, flush=True)
print('bb'*999999, file=sys.stderr, flush=True)
print('cc'*300, flush=True)
```

Running `python test.py out+err> a.txt` shoudn't hang nushell, and
`a.txt` keeps output in the same order

## About the change
The core idea is that when doing lite-parsing, introduce a new variant
`LiteElement::SameTargetRedirection` if we meet `out+err>` redirection
token(which is generated by lex function),

During converting from lite block to block,
LiteElement::SameTargetRedirection will be converted to
PipelineElement::SameTargetRedirection.

Then in the block eval process, if we get
PipelineElement::SameTargetRedirection, we'll invoke `run-external` with
`--redirect-combine` flag, then pipe the result into save command

## What happened internally?

Take the following command as example:
`^ls o+e> log.txt`

lex parsing result(`Tokens`) are not changed, but `LiteBlock` and
`Block` is changed after this pr.
### LiteBlock before
```rust
LiteBlock {
    block: [
        LitePipeline { commands: [
            Command(None, LiteCommand { comments: [], parts: [Span { start: 39041, end: 39044 }] }),
            // actually the span of first Redirection is wrong too..
            Redirection(Span { start: 39058, end: 39062 }, StdoutAndStderr, LiteCommand { comments: [], parts: [Span { start: 39050, end: 39057 }] }),
        ]
    }]
}
```
### LiteBlock after
```rust
LiteBlock { 
    block: [
        LitePipeline {
            commands: [
                SameTargetRedirection {
                    cmd: (None, LiteCommand { comments: [], parts: [Span { start: 147945, end: 147948}]}),
                    redirection: (Span { start: 147949, end: 147957 }, LiteCommand { comments: [], parts: [Span { start: 147958, end: 147965 }]})
                }
            ]
        }
    ]
}
```
### Block before
```rust
Pipeline {
    elements: [
        Expression(None, Expression {
            expr: ExternalCall(Expression { expr: String("ls"), span: Span { start: 39042, end: 39044 }, ty: String, custom_completion: None }, [], false),
            span: Span { start: 39041, end: 39044 },
            ty: Any, custom_completion: None 
        }),
        Redirection(Span { start: 39058, end: 39062 }, StdoutAndStderr, Expression { expr: String("out.txt"), span: Span { start: 39050, end: 39057 }, ty: String, custom_completion: None })] }
```
### Block after
```rust
Pipeline {
    elements: [
        SameTargetRedirection { 
            cmd: (None, Expression {
                expr: ExternalCall(Expression { expr: String("ls"), span: Span { start: 147946, end: 147948 }, ty: String, custom_completion: None}, [], false),
                span: Span { start: 147945, end: 147948},
                ty: Any, custom_completion: None
            }),
            redirection: (Span { start: 147949, end: 147957}, Expression {expr: String("log.txt"), span: Span { start: 147958, end: 147965 },ty: String,custom_completion: None}
        }
    ]
}
```

# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass
- `cargo run -- crates/nu-utils/standard_library/tests.nu` to run the
tests for the standard library

> **Note**
> from `nushell` you can also use the `toolkit` as follows
> ```bash
> use toolkit.nu # or use an `env_change` hook to activate it
automatically
> toolkit check pr
> ```

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.
This commit is contained in:
WindSoilder
2023-05-18 06:47:03 +08:00
committed by GitHub
parent 9c435fee75
commit b150f9f5d8
10 changed files with 265 additions and 75 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
crates/nu-parser/src/flatten.rs
View File

@ -532,6 +532,21 @@ pub fn flatten_pipeline_element(
output.append(&mut flatten_expression(working_set, err_expr));
output
}
PipelineElement::SameTargetRedirection {
cmd: (cmd_span, cmd_expr),
redirection: (redirect_span, redirect_expr),
} => {
let mut output = if let Some(span) = cmd_span {
let mut output = vec![(*span, FlatShape::Pipe)];
output.append(&mut flatten_expression(working_set, cmd_expr));
output
} else {
flatten_expression(working_set, cmd_expr)
};
output.push((*redirect_span, FlatShape::Redirection));
output.append(&mut flatten_expression(working_set, redirect_expr));
output
}
PipelineElement::And(span, expr) => {
let mut output = vec![(*span, FlatShape::And)];
output.append(&mut flatten_expression(working_set, expr));

40
crates/nu-parser/src/lite_parser.rs
View File

@ -43,6 +43,11 @@ pub enum LiteElement {
out: (Span, LiteCommand),
err: (Span, LiteCommand),
},
// SameTargetRedirection variant can only be generated by Command with Redirection::OutAndErr
SameTargetRedirection {
cmd: (Option<Span>, LiteCommand),
redirection: (Span, LiteCommand),
},
}
#[derive(Debug)]
@ -95,6 +100,7 @@ impl LiteBlock {
// the block takes ownership of `pipeline`, which means that
// our `pipeline` is complete on collecting commands.
self.merge_redirections(&mut pipeline);
self.merge_cmd_with_outerr_redirection(&mut pipeline);
self.block.push(pipeline);
}
@ -103,6 +109,40 @@ impl LiteBlock {
self.block.is_empty()
}
fn merge_cmd_with_outerr_redirection(&self, pipeline: &mut LitePipeline) {
let mut cmd_index = None;
let mut outerr_index = None;
for (index, cmd) in pipeline.commands.iter().enumerate() {
if let LiteElement::Command(..) = cmd {
cmd_index = Some(index);
}
if let LiteElement::Redirection(_span, Redirection::StdoutAndStderr, _target_cmd) = cmd
{
outerr_index = Some(index);
break;
}
}
if let (Some(cmd_index), Some(outerr_index)) = (cmd_index, outerr_index) {
// we can make sure that cmd_index is less than outerr_index.
let outerr_redirect = pipeline.commands.remove(outerr_index);
let cmd = pipeline.commands.remove(cmd_index);
// `outerr_redirect` and `cmd` should always be `LiteElement::Command` and `LiteElement::Redirection`
if let (
LiteElement::Command(cmd_span, lite_cmd),
LiteElement::Redirection(span, _, outerr_cmd),
) = (cmd, outerr_redirect)
{
pipeline.insert(
cmd_index,
LiteElement::SameTargetRedirection {
cmd: (cmd_span, lite_cmd),
redirection: (span, outerr_cmd),
},
)
}
}
}
fn merge_redirections(&self, pipeline: &mut LitePipeline) {
// In case our command may contains both stdout and stderr redirection.
// We pick them out and Combine them into one LiteElement::SeparateRedirection variant.

3
crates/nu-parser/src/parse_keywords.rs
View File

@ -1703,6 +1703,9 @@ pub fn parse_module_block(
LiteElement::SeparateRedirection {
out: (_, command), ..
} => block.pipelines.push(garbage_pipeline(&command.parts)),
LiteElement::SameTargetRedirection {
cmd: (_, command), ..
} => block.pipelines.push(garbage_pipeline(&command.parts)),
}
} else {
working_set.error(ParseError::Expected("not a pipeline".into(), span));

61
crates/nu-parser/src/parser.rs
View File

@ -4003,6 +4003,9 @@ pub fn parse_table_expression(
| LiteElement::Redirection(_, _, command)
| LiteElement::SeparateRedirection {
out: (_, command), ..
}
| LiteElement::SameTargetRedirection {
cmd: (_, command), ..
} => {
let mut table_headers = vec![];
@ -4022,6 +4025,9 @@ pub fn parse_table_expression(
| LiteElement::Redirection(_, _, command)
| LiteElement::SeparateRedirection {
out: (_, command), ..
}
| LiteElement::SameTargetRedirection {
cmd: (_, command), ..
} => {
let mut rows = vec![];
for part in &command.parts {
@ -5316,6 +5322,9 @@ pub fn parse_block(
| LiteElement::Redirection(_, _, command)
| LiteElement::SeparateRedirection {
out: (_, command), ..
}
| LiteElement::SameTargetRedirection {
cmd: (_, command), ..
} => parse_def_predecl(working_set, &command.parts),
}
}
@ -5362,6 +5371,20 @@ pub fn parse_block(
err: (*err_span, err_expr),
}
}
LiteElement::SameTargetRedirection {
cmd: (cmd_span, command),
redirection: (redirect_span, redirect_command),
} => {
trace!("parsing: pipeline element: same target redirection");
let expr = parse_expression(working_set, &command.parts, is_subexpression);
working_set.type_scope.add_type(expr.ty.clone());
let redirect_expr = parse_string(working_set, redirect_command.parts[0]);
working_set.type_scope.add_type(redirect_expr.ty.clone());
PipelineElement::SameTargetRedirection {
cmd: (*cmd_span, expr),
redirection: (*redirect_span, redirect_expr),
}
}
})
.collect::<Vec<PipelineElement>>();
@ -5436,9 +5459,27 @@ pub fn parse_block(
}
}
}
block.pipelines.push(pipeline)
}
LiteElement::SameTargetRedirection {
cmd: (span, command),
redirection: (redirect_span, redirect_cmd),
} => {
trace!("parsing: pipeline element: same target redirection");
let expr = parse_expression(working_set, &command.parts, is_subexpression);
working_set.type_scope.add_type(expr.ty.clone());
let redirect_expr = parse_string(working_set, redirect_cmd.parts[0]);
working_set.type_scope.add_type(redirect_expr.ty.clone());
block.pipelines.push(Pipeline {
elements: vec![PipelineElement::SameTargetRedirection {
cmd: (*span, expr),
redirection: (*redirect_span, redirect_expr),
}],
})
}
}
}
}
@ -5526,6 +5567,14 @@ pub fn discover_captures_in_pipeline_element(
discover_captures_in_expr(working_set, err_expr, seen, seen_blocks, output)?;
Ok(())
}
PipelineElement::SameTargetRedirection {
cmd: (_, cmd_expr),
redirection: (_, redirect_expr),
} => {
discover_captures_in_expr(working_set, cmd_expr, seen, seen_blocks, output)?;
discover_captures_in_expr(working_set, redirect_expr, seen, seen_blocks, output)?;
Ok(())
}
}
}
@ -5819,6 +5868,16 @@ fn wrap_element_with_collect(
out: (*out_span, wrap_expr_with_collect(working_set, out_exp)),
err: (*err_span, wrap_expr_with_collect(working_set, err_exp)),
},
PipelineElement::SameTargetRedirection {
cmd: (cmd_span, cmd_exp),
redirection: (redirect_span, redirect_exp),
} => PipelineElement::SameTargetRedirection {
cmd: (*cmd_span, wrap_expr_with_collect(working_set, cmd_exp)),
redirection: (
*redirect_span,
wrap_expr_with_collect(working_set, redirect_exp),
),
},
PipelineElement::And(span, expression) => {
PipelineElement::And(*span, wrap_expr_with_collect(working_set, expression))
}