2019-12-09 19:39:51 +01:00
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use crate::commands::WholeStreamCommand;
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use crate::context::CommandRegistry;
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use crate::prelude::*;
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use nu_errors::ShellError;
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use nu_protocol::{Signature, SyntaxShape};
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use nu_source::Tagged;
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pub struct Skip;
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#[derive(Deserialize)]
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pub struct SkipArgs {
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Futures v0.3 upgrade (#1344)
* Upgrade futures, async-stream, and futures_codec
These were the last three dependencies on futures-preview. `nu` itself
is now fully dependent on `futures@0.3`, as opposed to `futures-preview`
alpha.
Because the update to `futures` from `0.3.0-alpha.19` to `0.3.0` removed
the `Stream` implementation of `VecDeque` ([changelog][changelog]), most
commands that convert a `VecDeque` to an `OutputStream` broke and had to
be fixed.
The current solution is to now convert `VecDeque`s to a `Stream` via
`futures::stream::iter`. However, it may be useful for `futures` to
create an `IntoStream` trait, implemented on the `std::collections` (or
really any `IntoIterator`). If something like this happends, it may be
worthwhile to update the trait implementations on `OutputStream` and
refactor these commands again.
While upgrading `futures_codec`, we remove a custom implementation of
`LinesCodec`, as one has been added to the library. There's also a small
refactor to make the stream output more idiomatic.
[changelog]: https://github.com/rust-lang/futures-rs/blob/master/CHANGELOG.md#030---2019-11-5
* Upgrade sys & ps plugin dependencies
They were previously dependent on `futures-preview`, and `nu_plugin_ps`
was dependent on an old version of `futures-timer`.
* Remove dependency on futures-timer from nu
* Update Cargo.lock
* Fix formatting
* Revert fmt regressions
CI is still on 1.40.0, but the latest rustfmt v1.41.0 has changes to the
`val @ pattern` syntax, causing the linting job to fail.
* Fix clippy warnings
2020-02-06 04:46:48 +01:00
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rows: Option<Tagged<usize>>,
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2019-12-09 19:39:51 +01:00
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}
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impl WholeStreamCommand for Skip {
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fn name(&self) -> &str {
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"skip"
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}
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fn signature(&self) -> Signature {
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Signature::build("skip").optional("rows", SyntaxShape::Int, "how many rows to skip")
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}
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fn usage(&self) -> &str {
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"Skip some number of rows."
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}
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fn run(
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&self,
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args: CommandArgs,
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registry: &CommandRegistry,
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) -> Result<OutputStream, ShellError> {
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args.process(registry, skip)?.run()
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}
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}
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fn skip(SkipArgs { rows }: SkipArgs, context: RunnableContext) -> Result<OutputStream, ShellError> {
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let rows_desired = if let Some(quantity) = rows {
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*quantity
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} else {
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1
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};
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Ok(OutputStream::from_input(
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context.input.values.skip(rows_desired),
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))
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}
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