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https://github.com/nushell/nushell.git
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add last command
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parent
af2439e880
commit
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@ -168,6 +168,8 @@ pub async fn cli() -> Result<(), Box<dyn Error>> {
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whole_stream_command(SortBy),
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whole_stream_command(SortBy),
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whole_stream_command(Tags),
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whole_stream_command(Tags),
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whole_stream_command(First),
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whole_stream_command(First),
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whole_stream_command(Last),
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whole_stream_command(FromArray),
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whole_stream_command(FromArray),
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whole_stream_command(FromArray),
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whole_stream_command(FromCSV),
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whole_stream_command(FromCSV),
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whole_stream_command(FromINI),
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whole_stream_command(FromINI),
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@ -22,6 +22,7 @@ crate mod from_toml;
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crate mod from_xml;
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crate mod from_xml;
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crate mod from_yaml;
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crate mod from_yaml;
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crate mod get;
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crate mod get;
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crate mod last;
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crate mod lines;
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crate mod lines;
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crate mod ls;
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crate mod ls;
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crate mod mkdir;
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crate mod mkdir;
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@ -76,6 +77,7 @@ crate use from_toml::FromTOML;
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crate use from_xml::FromXML;
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crate use from_xml::FromXML;
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crate use from_yaml::FromYAML;
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crate use from_yaml::FromYAML;
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crate use get::Get;
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crate use get::Get;
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crate use last::Last;
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crate use lines::Lines;
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crate use lines::Lines;
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crate use ls::LS;
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crate use ls::LS;
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crate use mkdir::Mkdir;
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crate use mkdir::Mkdir;
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59
src/commands/last.rs
Normal file
59
src/commands/last.rs
Normal file
@ -0,0 +1,59 @@
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use crate::commands::WholeStreamCommand;
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use crate::errors::ShellError;
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use crate::parser::CommandRegistry;
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use crate::prelude::*;
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pub struct Last;
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impl WholeStreamCommand for Last {
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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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last(args, registry)
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}
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fn name(&self) -> &str {
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"last"
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}
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fn signature(&self) -> Signature {
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Signature::build("last").required("amount", SyntaxType::Literal)
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}
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}
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fn last(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
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let args = args.evaluate_once(registry)?;
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let amount = args.expect_nth(0)?.as_i64();
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let amount = match amount {
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Ok(o) => o,
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Err(_) => {
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return Err(ShellError::labeled_error(
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"Value is not a number",
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"expected integer",
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args.expect_nth(0)?.span(),
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))
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}
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};
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if amount <= 0 {
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return Err(ShellError::labeled_error(
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"Value is too low",
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"expected a positive integer",
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args.expect_nth(0)?.span(),
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))
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}
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let stream = async_stream_block! {
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let v: Vec<_> = args.input.into_vec().await;
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let k = v.len() - (amount as usize);
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for x in v[k..].iter() {
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let y: Tagged<Value> = x.clone();
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yield ReturnSuccess::value(y)
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}
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};
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Ok(stream.to_output_stream())
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}
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