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// Copyleft (ɔ) 2021-2021 The Whirlsplash Collective
// SPDX-License-Identifier: GPL-3.0-only
use std::str::FromStr;
pub enum BuiltIn {
Echo,
History,
Exit,
Null,
Help,
}
impl FromStr for BuiltIn {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"echo" => Ok(BuiltIn::Echo),
"history" => Ok(BuiltIn::History),
"exit" => Ok(BuiltIn::Exit),
"null" => Ok(BuiltIn::Null),
"help" => Ok(BuiltIn::Help),
_ => Err(()),
}
}
}
pub fn builtin_echo(args: &[String]) -> i32 {
println!("{}", args.join(" "));
0
}
pub fn builtin_history(history: Vec<String>) -> i32 {
for (index, cmd) in history.iter().enumerate() {
println!("{} {}", index, cmd.trim());
}
0
}
pub fn builtin_help() -> i32 {
println!(
"echo - display a line of text\nhistory - manipulate the history list\nexit - end the \
application"
);
0
}
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