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// Copyright (C) 2021-2021 The Whirlsplash Collective
// SPDX-License-Identifier: GPL-3.0-only
//! The Whirl Shell, for local interaction.
#![feature(
type_ascription,
hash_set_entry,
decl_macro,
proc_macro_hygiene,
stmt_expr_attributes
)]
#![deny(
warnings,
nonstandard_style,
unused,
future_incompatible,
rust_2018_idioms,
unsafe_code
)]
#![deny(clippy::all, clippy::nursery, clippy::pedantic)]
#![recursion_limit = "128"]
#![doc(
html_logo_url = "https://raw.githubusercontent.com/Whirlsplash/assets/master/Whirl.png",
html_favicon_url = "https://raw.githubusercontent.com/Whirlsplash/assets/master/Whirl.png"
)]
mod builtins;
mod structure;
use {
crate::{
builtins::{
builtin_cat, builtin_clear, builtin_config, builtin_echo, builtin_fetch,
builtin_help, builtin_history, builtin_ls, structures::BuiltIn,
},
structure::Command,
},
std::{io, io::Write, str::FromStr},
whirl_config::Config,
};
pub struct Prompt {
history: Vec<String>,
}
impl Prompt {
/// Begin handling user input as the prompt.
#[allow(clippy::unused_async)]
pub async fn handle() -> ! {
let mut prompt = Self { history: vec![] };
loop {
Self::write_prompt();
let command = Self::read_command();
prompt.process_command(&Self::tokenize_command(&command));
}
}
fn write_prompt() {
print!("{} ", Config::get().whirlsplash.prompt.ps1);
io::stdout().flush().unwrap();
}
fn read_command() -> String {
let mut input = String::new();
io::stdin()
.read_line(&mut input)
.expect("failed to read command from stdin");
if input.len() <= 1 {
input = "null".to_string();
}
input
}
fn tokenize_command(c: &str) -> Command {
let mut command_split: Vec<String> =
c.split_whitespace().map(std::string::ToString::to_string).collect();
Command { keyword: command_split.remove(0), args: command_split }
}
// TODO: Find a way to make this access itself `history` doesn't have to be
// passed everytime.
fn process_command(&mut self, c: &Command) -> i32 {
let exit_code = match BuiltIn::from_str(&c.keyword) {
Ok(BuiltIn::Echo) => builtin_echo(&c.args),
Ok(BuiltIn::Exit) => std::process::exit(0),
Ok(BuiltIn::History) => builtin_history(&self.history),
Ok(BuiltIn::Null) => 0,
Ok(BuiltIn::Help) => builtin_help(),
Ok(BuiltIn::Ls) => builtin_ls(),
Ok(BuiltIn::Cat) => builtin_cat(&c.args),
Ok(BuiltIn::Config) => builtin_config(&c.args),
Ok(BuiltIn::Fetch) => builtin_fetch(&c.args),
Ok(BuiltIn::Clear) => builtin_clear(),
_ => {
println!("wsh: command not found: {}", &c.keyword);
1
}
};
if c.keyword != "null" {
self.history.push(c.to_line());
}
exit_code
}
}
#[cfg(test)]
mod tokenize_command {
use crate::Prompt;
#[test]
#[ignore]
fn empty_command() { assert_eq!("", Prompt::tokenize_command("").keyword) }
#[test]
fn test_keyword() {
assert_eq!("test", Prompt::tokenize_command("test").keyword);
}
#[test]
fn no_arg() { assert_eq!(0, Prompt::tokenize_command("test").args.len()) }
#[test]
fn one_arg() {
assert_eq!(1, Prompt::tokenize_command("test one").args.len());
}
#[test]
fn multi_arg() {
assert_eq!(3, Prompt::tokenize_command("test one two three").args.len());
}
#[test]
#[ignore]
fn quotes() {
assert_eq!(
2,
Prompt::tokenize_command("test \"one two\" three").args.len()
);
}
}
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