nushell/src/commands/command.rs

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use crate::errors::ShellError;
use crate::object::Value;
use crate::prelude::*;
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use std::path::PathBuf;
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pub trait CommandBlueprint {
fn create(
&self,
input: Vec<Value>,
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host: &dyn crate::Host,
env: &mut crate::Environment,
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) -> Result<Box<dyn Command>, ShellError>;
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}
pub enum CommandAction {
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ChangeCwd(PathBuf),
}
pub enum ReturnValue {
Value(Value),
Action(CommandAction),
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}
impl ReturnValue {
crate fn single(value: Value) -> VecDeque<ReturnValue> {
let mut v = VecDeque::new();
v.push_back(ReturnValue::Value(value));
v
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}
crate fn change_cwd(path: PathBuf) -> ReturnValue {
ReturnValue::Action(CommandAction::ChangeCwd(path))
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}
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}
pub trait Command {
fn run(&mut self, stream: VecDeque<Value>) -> Result<VecDeque<ReturnValue>, ShellError>;
}