Merge pull request 'doc/readme' (#1) from doc/readme into main

Reviewed-on: https://gitea.ahur.ac/ahurac/rash/pulls/1

README.md

@@ -2,5 +2,21 @@
 
 [![Please don't upload to GitHub](https://nogithub.codeberg.page/badge.svg)](https://nogithub.codeberg.page)
 
-(The only purpose of this is learning Rust!)
+## To-do
 
+- [x] Read commands from `stdin`
+- [ ] Exit with last child termination code
+- [ ] Handle background jobs
+- [ ] Handle pipes
+- [ ] Handle double quotes
+- [ ] Handle variables
+- [ ] Interaction with environment variables
+- [ ] Handle aliases
+- [ ] Builtins
+    - [ ] `cd`
+    - [ ] `exit`
+- [ ] Special variables
+    - [ ] `_`
+    - [ ] `PS1`
+    - [ ] Positional variables
+- [ ] Handle signals

src/input.rs

@@ -1,5 +1,6 @@
 use std::io as stdio;
 use stdio::stdin;
+use crate::parser;
 
 pub struct Buffer {
     buffer: String,
@@ -27,11 +28,11 @@ impl Buffer {
         }
     }
 
-    pub fn is_empty(&self) -> bool {
-        self.buffer.is_empty()
+    pub fn parse(&self) -> Option<Vec<String>> {
+        if ! self.buffer.is_empty() {
+            Some(parser::parse(&self.buffer))
+        } else {
+            None
         }
-
-    pub fn get_buffer(&self) -> &String {
-        &self.buffer
     }
 }

src/job.rs

@@ -0,0 +1,23 @@
+use std::process::{
+    Command,
+    ExitStatus,
+};
+use std::io::{
+    Result,
+    Error,
+    ErrorKind,
+};
+
+pub fn execute(mut argv: Vec<String>) -> Result<ExitStatus> {
+    let mut command = Command::new(&argv[0]);
+    argv.remove(0);
+    command.args(argv);
+
+    let child = command.spawn();
+
+    if child.is_ok() {
+        child.unwrap().wait()
+    } else {
+        Err(Error::new(ErrorKind::Other, "failed to spawn child process"))
+    }
+}

src/main.rs

@@ -3,21 +3,20 @@ use std::process::exit;
 mod input;
 mod output;
 mod parser;
+mod job;
 
 fn main() {
     let mut buffer = input::Buffer::new();
     let mut bytes_read: usize = 1;
-    let mut command_line: String;
-    let mut argv: Vec<String>;
+    let mut argv: Option<Vec<String>>;
 
     while bytes_read != 0 {
         output::print_ps1();
         bytes_read = buffer.read_line();
 
-        if ! buffer.is_empty() {
-            command_line = buffer.get_buffer().to_string();
-            argv = parser::parse(&command_line);
-            println!("{:?}", argv);
+        argv = buffer.parse();
+        if argv.is_some() {
+            let _ = job::execute(argv.unwrap());
         }
     }