2019-08-19 05:16:39 +00:00
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use crate::commands::WholeStreamCommand;
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2019-07-23 22:22:11 +00:00
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use crate::context::CommandRegistry;
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2019-09-05 16:23:42 +00:00
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use crate::data::base::select_fields;
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2019-05-15 18:14:51 +00:00
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use crate::prelude::*;
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Extract core stuff into own crates
This commit extracts five new crates:
- nu-source, which contains the core source-code handling logic in Nu,
including Text, Span, and also the pretty.rs-based debug logic
- nu-parser, which is the parser and expander logic
- nu-protocol, which is the bulk of the types and basic conveniences
used by plugins
- nu-errors, which contains ShellError, ParseError and error handling
conveniences
- nu-textview, which is the textview plugin extracted into a crate
One of the major consequences of this refactor is that it's no longer
possible to `impl X for Spanned<Y>` outside of the `nu-source` crate, so
a lot of types became more concrete (Value became a concrete type
instead of Spanned<Value>, for example).
This also turned a number of inherent methods in the main nu crate into
plain functions (impl Value {} became a bunch of functions in the
`value` namespace in `crate::data::value`).
2019-11-26 02:30:48 +00:00
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use nu_errors::ShellError;
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2019-11-30 00:21:05 +00:00
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use nu_protocol::{Signature, SyntaxShape};
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2019-11-21 14:33:14 +00:00
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use nu_source::Tagged;
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2019-05-15 18:14:51 +00:00
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2019-08-20 03:15:05 +00:00
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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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2019-08-19 05:16:39 +00:00
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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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2019-07-23 22:22:11 +00:00
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2019-08-19 05:16:39 +00:00
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fn signature(&self) -> Signature {
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2019-10-28 05:15:35 +00:00
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Signature::build("pick").rest(SyntaxShape::Any, "the columns to select from the table")
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2019-05-22 07:12:03 +00:00
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}
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2019-08-21 12:08:23 +00:00
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2019-08-29 22:52:32 +00:00
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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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2019-08-21 12:08:23 +00:00
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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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2019-08-19 05:16:39 +00:00
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}
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2019-08-20 03:15:05 +00:00
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fn pick(
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PickArgs { rest: fields }: PickArgs,
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2019-08-20 06:11:11 +00:00
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RunnableContext { input, name, .. }: RunnableContext,
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2019-08-20 03:15:05 +00:00
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) -> Result<OutputStream, ShellError> {
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2019-12-06 15:28:26 +00:00
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if fields.is_empty() {
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2019-08-20 06:11:11 +00:00
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return Err(ShellError::labeled_error(
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2019-08-23 20:31:14 +00:00
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"Pick requires columns to pick",
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2019-08-20 06:11:11 +00:00
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"needs parameter",
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name,
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));
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}
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2019-08-20 03:15:05 +00:00
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let fields: Vec<_> = fields.iter().map(|f| f.item.clone()).collect();
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2019-05-15 18:14:51 +00:00
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2019-07-08 16:44:53 +00:00
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let objects = input
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2019-07-03 20:31:15 +00:00
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.values
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2019-11-21 14:33:14 +00:00
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.map(move |value| select_fields(&value, &fields, value.tag.clone()));
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2019-05-15 18:14:51 +00:00
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2019-07-03 20:31:15 +00:00
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Ok(objects.from_input_stream())
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2019-05-15 18:14:51 +00:00
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}
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