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// Copyleft (ɔ) 2021-2021 The Whirlsplash Collective
// SPDX-License-Identifier: GPL-3.0-only
mod builtins;
mod structure;
use std::{io, io::Write, str::FromStr};
use crate::{
config::Config,
prompt::{
builtins::{builtin_echo, builtin_help, builtin_history, BuiltIn},
structure::Command,
},
};
pub struct Prompt {
history: Vec<String>,
}
impl Prompt {
pub fn handle() -> ! {
let mut prompt = Prompt {
history: vec![]
};
loop {
Prompt::write_prompt();
Prompt::process_command(
Prompt::tokenize_command(prompt.read_command()),
prompt.history.clone(),
);
}
}
fn write_prompt() {
print!("{} ", Config::get().unwrap().whirlsplash.prompt_ps1);
io::stdout().flush().unwrap();
}
fn read_command(&mut self) -> String {
let mut input = String::new();
io::stdin()
.read_line(&mut input)
.expect("failed to read command from stdin");
if input.len() > 2 {
self.history.push(input.clone());
} else {
input = "null".to_string();
}
input
}
fn tokenize_command(c: String) -> Command {
let mut command_split: Vec<String> = c.split_whitespace().map(|s| s.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(c: Command, history: Vec<String>) -> i32 {
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(history),
Ok(BuiltIn::Null) => 0,
Ok(BuiltIn::Help) => builtin_help(),
_ => {
println!("wsh: command not found: {}", &c.keyword);
1
}
}
}
}
#[cfg(test)]
mod tokenize_command {
use crate::prompt::Prompt;
#[test]
#[ignore]
fn empty_command() { assert_eq!("", Prompt::tokenize_command("".to_string()).keyword) }
#[test]
fn test_keyword() { assert_eq!("test", Prompt::tokenize_command("test".to_string()).keyword) }
#[test]
fn no_arg() { assert_eq!(0, Prompt::tokenize_command("test".to_string()).args.len()) }
#[test]
fn one_arg() {
assert_eq!(
1,
Prompt::tokenize_command("test one".to_string()).args.len()
)
}
#[test]
fn multi_arg() {
assert_eq!(
3,
Prompt::tokenize_command("test one two three".to_string())
.args
.len()
)
}
#[test]
#[ignore]
fn quotes() {
assert_eq!(
2,
Prompt::tokenize_command("test \"one two\" three".to_string())
.args
.len()
)
}
}
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