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Declare input and output types of commands (#6796)

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* Add failing test that list of ints and floats is List<Number>

* Start defining subtype relation

* Make it possible to declare input and output types for commands

- Enforce them in tests

* Declare input and output types of commands

* Add formatted signatures to `help commands` table

* Revert SyntaxShape::Table -> Type::Table change

* Revert unnecessary derive(Hash) on SyntaxShape

Co-authored-by: JT <547158+jntrnr@users.noreply.github.com>
This commit is contained in:
Dan Davison
2022-11-09 16:55:05 -05:00
committed by GitHub
parent f878276de7
commit df94052180
238 changed files with 2315 additions and 756 deletions
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10
crates/nu-command/src/math/product.rs
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@ -2,7 +2,7 @@ use crate::math::reducers::{reducer_for, Reduce};
use crate::math::utils::run_with_function;
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, Span, Value};
use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, Span, Type, Value};
#[derive(Clone)]
pub struct SubCommand;
@ -13,11 +13,13 @@ impl Command for SubCommand {
}
fn signature(&self) -> Signature {
Signature::build("math product").category(Category::Math)
Signature::build("math product")
.input_output_types(vec![(Type::List(Box::new(Type::Number)), Type::Number)])
.category(Category::Math)
}
fn usage(&self) -> &str {
"Finds the product of a list of numbers or tables"
"Returns the product of a list of numbers or the products of each column of a table"
}
fn search_terms(&self) -> Vec<&str> {
@ -36,7 +38,7 @@ impl Command for SubCommand {
fn examples(&self) -> Vec<Example> {
vec![Example {
description: "Get the product of a list of numbers",
description: "Compute the product of a list of numbers",
example: "[2 3 3 4] | math product",
result: Some(Value::test_int(72)),
}]