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 struct CommandArgs<'caller> {
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pub host: &'caller mut dyn Host,
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pub env: &'caller Environment,
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pub args: Vec<Value>,
pub input: VecDeque<Value>,
}
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impl CommandArgs<'caller> {
crate fn from_context(
ctx: &'caller mut Context,
args: Vec<Value>,
input: VecDeque<Value>,
) -> CommandArgs<'caller> {
CommandArgs {
host: &mut ctx.host,
env: &ctx.env,
args,
input,
}
}
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}
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#[derive(Debug)]
pub enum CommandAction {
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ChangeCwd(PathBuf),
}
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#[derive(Debug)]
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 {
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fn run(&self, args: CommandArgs<'caller>) -> Result<VecDeque<ReturnValue>, ShellError>;
}
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impl<F> Command for F
where
F: Fn(CommandArgs<'_>) -> Result<VecDeque<ReturnValue>, ShellError>,
{
fn run(&self, args: CommandArgs<'caller>) -> Result<VecDeque<ReturnValue>, ShellError> {
self(args)
}
}