forked from extern/nushell
c6fe58467b
* Change alias shape inference to proposal of RFC#4 * Remove commented code * Fix typo * Change comment to be more informative * Make match statement to lookup in table * Remove resolved question https://github.com/nushell/nushell/pull/2685#discussion_r509832054 * Pick ...or_insert_dependency functions into pieces Previously there was get_shape_of_expr_or_insert dependency, now there is get_shape_of_expr and get_shape_of_expr_or_insert_dependency 2 new functions have been added: get_result_shape_of_math_expr and get_result_shape_of_math_expr_or_insert_dependency * Remove flattening of deep binary expressions Previously deep binary expressions have been flattened through the insertion of fake vars. This logic was quite complicated. Now if a variable depends on the result shape of a binary expression and the result shape can't be computed, the variable simply depends on the whole binary. * Change Expression::Variable(Variable::It(...)) to Expression::Variable(...) * Simplify get_result_shapes_in_math_expr * Simplify infer_shapes_in_binary_expr * Clarify comment * Clarify comment * Fix clippy lint * Move check for real var into checked_insert * Remove comment * Rename var
79 lines
2.5 KiB
Rust
79 lines
2.5 KiB
Rust
use crate::commands::classified::block::run_block;
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use crate::commands::WholeStreamCommand;
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use crate::prelude::*;
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use derive_new::new;
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use nu_errors::ShellError;
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use nu_protocol::{hir::Block, PositionalType, Scope, Signature, UntaggedValue};
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#[derive(new, Clone)]
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pub struct AliasCommand {
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sig: Signature,
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block: Block,
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}
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#[async_trait]
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impl WholeStreamCommand for AliasCommand {
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fn name(&self) -> &str {
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&self.sig.name
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}
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fn signature(&self) -> Signature {
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self.sig.clone()
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}
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fn usage(&self) -> &str {
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""
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}
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async 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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let call_info = args.call_info.clone();
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let registry = registry.clone();
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let mut block = self.block.clone();
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block.set_redirect(call_info.args.external_redirection);
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// let alias_command = self.clone();
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let mut context = EvaluationContext::from_args(&args, ®istry);
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let input = args.input;
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let scope = call_info.scope.clone();
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let evaluated = call_info.evaluate(®istry).await?;
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let mut vars = IndexMap::new();
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let mut num_positionals = 0;
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if let Some(positional) = &evaluated.args.positional {
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num_positionals = positional.len();
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for (idx, arg) in positional.iter().enumerate() {
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let pos_type = &self.sig.positional[idx].0;
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match pos_type {
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PositionalType::Mandatory(name, _) | PositionalType::Optional(name, _) => {
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vars.insert(name.clone(), arg.clone());
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}
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}
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}
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}
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//Fill out every missing argument with empty value
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if self.sig.positional.len() > num_positionals {
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for idx in num_positionals..self.sig.positional.len() {
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let pos_type = &self.sig.positional[idx].0;
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match pos_type {
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PositionalType::Mandatory(name, _) | PositionalType::Optional(name, _) => {
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vars.insert(name.clone(), UntaggedValue::nothing().into_untagged_value());
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}
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}
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}
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}
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let scope = Scope::append_vars(scope, vars);
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// FIXME: we need to patch up the spans to point at the top-level error
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Ok(run_block(&block, &mut context, input, scope)
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.await?
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.to_output_stream())
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}
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}
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