forked from extern/nushell
56 lines
1.3 KiB
Rust
56 lines
1.3 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::context::CommandRegistry;
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use crate::data::base::select_fields;
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use crate::errors::ShellError;
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use crate::prelude::*;
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#[derive(Deserialize)]
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struct PickArgs {
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rest: Vec<Tagged<String>>,
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}
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pub struct Pick;
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impl WholeStreamCommand for Pick {
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fn name(&self) -> &str {
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"pick"
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}
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fn signature(&self) -> Signature {
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Signature::build("pick").rest(SyntaxShape::Any)
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}
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fn usage(&self) -> &str {
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"Down-select table to only these columns."
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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, pick)?.run()
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}
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}
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fn pick(
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PickArgs { rest: fields }: PickArgs,
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RunnableContext { input, name, .. }: RunnableContext,
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) -> Result<OutputStream, ShellError> {
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if fields.len() == 0 {
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return Err(ShellError::labeled_error(
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"Pick requires columns to pick",
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"needs parameter",
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name,
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));
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}
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let fields: Vec<_> = fields.iter().map(|f| f.item.clone()).collect();
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let objects = input
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.values
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.map(move |value| select_fields(&value.item, &fields, value.tag()));
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Ok(objects.from_input_stream())
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}
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