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Support o>>, e>>, o+e>> to append output to an external file (#10764)

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# Description
Close: #10278

This pr introduces `o>>`, `e>>`, `o+e>>` to allow redirection to append
to a file.
Examples:
```nushell
echo abc o>> a.txt
echo abc o>> a.txt
cat asdf e>> a.txt
cat asdf e>> a.txt
cat asdf o+e>> a.txt
```

~~TODO:~~
~~1. currently internal commands with `o+e>` redirect to a variable is
broken: `let x = "a.txt"; echo abc o+e> $x`, not sure when it was
introduced...~~
~~2. redirect stdout and stderr with append mode doesn't supported yet:
`cat asdf o>>a.txt e>>b.ext`~~

~~For these 2 items, I'd like to fix them in different prs.~~
Already done in this pr
This commit is contained in:
WindSoilder
2023-11-27 21:52:39 +08:00
committed by GitHub
parent 1ff8c2d81d
commit 077d1c8125
13 changed files with 364 additions and 147 deletions
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8
crates/nu-parser/src/flatten.rs
View File

@@ -528,14 +528,14 @@ pub fn flatten_pipeline_element(
flatten_expression(working_set, expr)
}
}
PipelineElement::Redirection(span, _, expr) => {
PipelineElement::Redirection(span, _, expr, _) => {
let mut output = vec![(*span, FlatShape::Redirection)];
output.append(&mut flatten_expression(working_set, expr));
output
}
PipelineElement::SeparateRedirection {
out: (out_span, out_expr),
err: (err_span, err_expr),
out: (out_span, out_expr, _),
err: (err_span, err_expr, _),
} => {
let mut output = vec![(*out_span, FlatShape::Redirection)];
output.append(&mut flatten_expression(working_set, out_expr));
@@ -545,7 +545,7 @@ pub fn flatten_pipeline_element(
}
PipelineElement::SameTargetRedirection {
cmd: (cmd_span, cmd_expr),
redirection: (redirect_span, redirect_expr),
redirection: (redirect_span, redirect_expr, _),
} => {
let mut output = if let Some(span) = cmd_span {
let mut output = vec![(*span, FlatShape::Pipe)];