mirror of
https://github.com/nushell/nushell
synced 2025-01-10 04:09:09 +00:00
e4226def16
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`).
63 lines
1.8 KiB
Rust
63 lines
1.8 KiB
Rust
use crate::commands::PerItemCommand;
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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::{CallInfo, ReturnSuccess, Scope, Signature, SyntaxShape, UntaggedValue, Value};
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pub struct Where;
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impl PerItemCommand for Where {
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fn name(&self) -> &str {
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"where"
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}
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fn signature(&self) -> Signature {
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Signature::build("where").required(
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"condition",
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SyntaxShape::Block,
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"the condition that must match",
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)
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}
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fn usage(&self) -> &str {
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"Filter table to match the condition."
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}
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fn run(
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&self,
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call_info: &CallInfo,
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_registry: &CommandRegistry,
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_raw_args: &RawCommandArgs,
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input: Value,
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) -> Result<OutputStream, ShellError> {
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let input_clone = input.clone();
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let condition = call_info.args.expect_nth(0)?;
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let stream = match condition {
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Value {
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value: UntaggedValue::Block(block),
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..
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} => {
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let result = block.invoke(&Scope::new(input_clone.clone()));
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match result {
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Ok(v) => {
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if v.is_true() {
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VecDeque::from(vec![Ok(ReturnSuccess::Value(input_clone))])
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} else {
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VecDeque::new()
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}
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}
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Err(e) => return Err(e),
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}
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}
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Value { tag, .. } => {
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return Err(ShellError::labeled_error(
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"Expected a condition",
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"where needs a condition",
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tag,
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))
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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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}
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