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14 commits

11 changed files with 186 additions and 60 deletions

2
Cargo.lock generated
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@ -4,4 +4,4 @@ version = 3
[[package]]
name = "rash"
version = "0.5.0"
version = "0.6.0"

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@ -1,6 +1,6 @@
[package]
name = "rash"
version = "0.5.0"
version = "0.6.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

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@ -12,6 +12,7 @@ I want to learn Rust and see how much effort I can put into making an interopera
- [ ] Environment variables
- [ ] Builtins
- [x] `cd`
- [x] `:`
- [ ] `set`
- [ ] `alias`
- [ ] `type`
@ -19,3 +20,4 @@ I want to learn Rust and see how much effort I can put into making an interopera
- [ ] PS1
- [ ] Execute code from a file
- [ ] Clean error handling
- [ ] Override Ctrl-C

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@ -1,4 +1,6 @@
use crate::{error::print_error, exit_code::ExitCode};
use crate::error;
use crate::error::CdError;
use crate::exit_code::ExitCode;
use std::env;
use std::{env::set_current_dir, path::PathBuf};
@ -17,18 +19,20 @@ pub(super) fn cd(args: &Vec<String>) -> ExitCode {
let exit_code: ExitCode;
if path.is_some() {
exit_code = match set_current_dir(path.unwrap()) {
Ok(()) => ExitCode::success(),
Err(_e) => ExitCode::new(2),
};
let path = path.unwrap();
let result = set_current_dir(&path);
if result.is_err() {
let error = CdError::new(&args[0]);
error::print(Box::new(error));
exit_code = ExitCode::new(2);
} else {
exit_code = ExitCode::success();
}
} else {
exit_code = ExitCode::success();
}
if exit_code.get() != 0 {
print_error("lol");
}
exit_code
}

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@ -2,7 +2,8 @@ mod builtins;
pub mod command_builder;
pub mod command_sequence;
use crate::error::print_error;
use crate::error;
use crate::error::CommandNotFoundError;
use crate::exit_code::ExitCode;
type BuiltinFunction = fn(&Vec<String>) -> ExitCode;
@ -81,20 +82,9 @@ impl Command for UnixProgram {
exit_code
} else {
let message = format!(
"{}: command not found",
self.command.get_program().to_str().unwrap()
);
print_error(message.as_str());
let error = CommandNotFoundError::new(self.command.get_program().to_str().unwrap());
error::print(Box::new(error));
ExitCode::not_found()
}
}
}
struct Nothing;
impl Command for Nothing {
fn spawn(&mut self) -> ExitCode {
ExitCode::success()
}
}

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@ -1,7 +1,8 @@
use crate::command::Command;
use crate::exit_code::ExitCode;
use crate::interface::{get_user_input, print_prompt};
use crate::interface::get_user_input;
use crate::parser::parse;
use crate::variables::Variables;
fn exit(code: &ExitCode) {
let code = i32::from(code.get());
@ -11,13 +12,13 @@ fn exit(code: &ExitCode) {
pub fn run() {
let mut current_exit_code = ExitCode::new(0);
let mut variables = Variables::new();
loop {
print_prompt();
let user_input = get_user_input();
if user_input.is_some() {
let mut command_sequence = parse(user_input.unwrap());
let mut command_sequence = parse(user_input.unwrap(), &variables);
if !command_sequence.is_empty() {
current_exit_code = command_sequence.spawn();

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@ -1,9 +1,59 @@
use std::env;
use std::fmt;
use std::fmt::{Display, Formatter};
use std::path::Path;
pub fn print_error(message: &str) {
type Error = Box<dyn Display>;
pub struct CdError {
entry_name: String,
}
impl CdError {
pub fn new(entry_name: &str) -> Self {
Self {
entry_name: String::from(entry_name),
}
}
}
impl Display for CdError {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(f, "cd: no such directory as '{}'", self.entry_name)
}
}
pub struct CommandNotFoundError {
command: String,
}
impl CommandNotFoundError {
pub fn new(command: &str) -> Self {
Self {
command: String::from(command),
}
}
}
impl Display for CommandNotFoundError {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(f, "{}: command not found", self.command)
}
}
pub struct UnmatchedQuoteError {
index: usize,
}
impl Display for UnmatchedQuoteError {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(f, "unmatched quote at character {}", self.index)
}
}
pub fn print(error: Error) {
let name = env::args().next().unwrap_or(String::from("rash"));
let name = Path::new(&name).file_name().unwrap().to_str().unwrap();
eprintln!("{}: {}", name, message);
eprintln!("{}: {}", name, error);
}

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@ -1,21 +1,22 @@
use std::io::Write;
use std::io::{stdin, stdout};
pub fn print_prompt() {
fn print_prompt() {
print!("$ ");
stdout().flush().unwrap();
}
pub fn get_user_input() -> Option<String> {
print_prompt();
let mut user_input = String::new();
let bytes_read = stdin()
.read_line(&mut user_input)
.expect("error reading user input");
if bytes_read == 0 {
None
} else {
Some(user_input)
match bytes_read {
0 => None,
_ => Some(user_input),
}
}

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@ -4,6 +4,7 @@ mod error;
mod exit_code;
mod interface;
mod parser;
mod variables;
fn main() {
control::run();

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@ -1,8 +1,25 @@
use crate::command::command_builder::CommandBuilder;
use crate::command::command_sequence::CommandSequence;
use crate::variables::Variables;
fn parse_variable(characters: &mut Vec<char>, variables: &Variables) -> String {
if characters.is_empty() {
String::new()
} else {
let mut current_char = characters.pop().unwrap();
let mut var_name = String::new();
while !characters.is_empty() && !current_char.is_whitespace() {
var_name.push(current_char);
current_char = characters.pop().unwrap();
}
variables.get(var_name.as_str())
}
}
fn parse_quote(characters: &mut Vec<char>) -> String {
let mut quoted = String::default();
let mut quoted = String::new();
if !characters.is_empty() {
let mut current_char = characters.pop().unwrap();
@ -16,42 +33,49 @@ fn parse_quote(characters: &mut Vec<char>) -> String {
quoted
}
fn parse_backslash(characters: &mut Vec<char>) -> Option<char> {
let mut escaped_char: Option<char> = None;
if !characters.is_empty() {
escaped_char = Some(characters.pop().unwrap());
}
fn parse_backslash(characters: &mut Vec<char>) -> String {
let escaped_char = match characters.is_empty() {
false => String::from(characters.pop().unwrap()),
true => String::new(),
};
escaped_char
}
fn parse_main(characters: &mut Vec<char>, current_arg: &mut String) -> Vec<String> {
fn parse_main(
characters: &mut Vec<char>,
current_arg: &mut String,
variables: &Variables,
) -> Vec<String> {
if characters.is_empty() {
vec![]
let mut last_arg = vec![];
if !current_arg.is_empty() {
last_arg.push(current_arg.clone());
}
last_arg
} else {
let current_char = characters.pop().unwrap();
if current_char.is_whitespace() {
if !current_arg.is_empty() {
let mut argv: Vec<String> = vec![current_arg.clone()];
argv.append(&mut parse_main(characters, &mut String::default()));
argv.append(&mut parse_main(characters, &mut String::new(), variables));
argv
} else {
parse_main(characters, current_arg)
parse_main(characters, current_arg, variables)
}
} else if current_char == '\\' {
let escaped_char = parse_backslash(characters);
if escaped_char.is_some() {
current_arg.push(escaped_char.unwrap());
}
parse_main(characters, current_arg)
current_arg.push_str(parse_backslash(characters).as_str());
parse_main(characters, current_arg, variables)
} else if current_char == '$' {
current_arg.push_str(parse_variable(characters, variables).as_str());
parse_main(characters, current_arg, variables)
} else if current_char == '\'' {
current_arg.push_str(parse_quote(characters).as_str());
parse_main(characters, current_arg)
parse_main(characters, current_arg, variables)
} else if current_char == ';' {
let mut argv: Vec<String> = vec![];
@ -62,17 +86,17 @@ fn parse_main(characters: &mut Vec<char>, current_arg: &mut String) -> Vec<Strin
argv
} else {
current_arg.push(current_char);
parse_main(characters, current_arg)
parse_main(characters, current_arg, variables)
}
}
}
pub fn parse(line: String) -> CommandSequence {
pub fn parse(line: String, variables: &Variables) -> CommandSequence {
let mut characters: Vec<char> = line.chars().rev().collect();
let mut command_sequence = CommandSequence::new();
while !characters.is_empty() {
let argv = parse_main(&mut characters, &mut String::default());
let argv = parse_main(&mut characters, &mut String::new(), variables);
if !argv.is_empty() {
let command = CommandBuilder::new(argv).build();
@ -82,6 +106,3 @@ pub fn parse(line: String) -> CommandSequence {
command_sequence
}
#[derive(Debug)]
struct UnmatchedQuoteError;

56
src/variables.rs Normal file
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@ -0,0 +1,56 @@
use std::collections::HashMap;
use std::env::{self, args};
pub struct Variables {
variables: HashMap<String, String>,
}
impl Variables {
pub fn new() -> Self {
Self {
variables: HashMap::new(),
}
}
pub fn get(&self, key: &str) -> String {
let arg_index = String::from(key).parse::<usize>();
match arg_index {
Ok(index) => match env::args().nth(index) {
Some(value) => value,
None => String::new(),
},
Err(_e) => match self.variables.get(key) {
Some(value) => value.clone(),
None => match env::var(key) {
Ok(value) => value,
Err(_e) => String::new(),
},
},
}
}
pub fn unset(&mut self, key: &str) {
let old_value = self.variables.remove(key);
if old_value.is_none() {
env::remove_var(key);
}
}
pub fn set(&mut self, key: &str, value: &str) {
self.variables
.insert(String::from(key), String::from(value));
}
pub fn export(&mut self, key: &str) {
let var_to_export = self.variables.get(key);
if var_to_export.is_some() {
env::set_var(key, var_to_export.unwrap());
self.variables.remove(key);
} else {
env::set_var(key, "");
}
}
}