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266
src/executor_processes/processes.rs
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266
src/executor_processes/processes.rs
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// Copyright (C) 2024 Bellande Architecture Mechanism Research Innovation Center, Ronaldson Bellande
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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use crate::interpreter::interpreter::Interpreter;
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use crate::utilities::utilities::{ASTNode, RedirectType};
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use glob::glob;
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use std::fs::{File, OpenOptions};
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use std::io::{self, BufReader, BufWriter, Cursor, Read, Write};
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use std::process::{Child, Command, Stdio};
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use std::sync::{Arc, Mutex};
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use std::thread;
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pub struct Processes {
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background_jobs: Arc<Mutex<Vec<Arc<Mutex<Child>>>>>,
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}
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impl Processes {
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pub fn new() -> Self {
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Processes {
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background_jobs: Arc::new(Mutex::new(Vec::new())),
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}
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}
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pub fn execute_command(
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&self,
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interpreter: &mut Interpreter,
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name: String,
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args: Vec<String>,
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) -> Result<Option<i32>, String> {
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let expanded_name = interpreter.expand_variables(&name);
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let expanded_args: Vec<String> = args
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.iter()
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.map(|arg| interpreter.expand_variables(arg))
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.collect();
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match expanded_name.as_str() {
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"echo" => {
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println!("{}", expanded_args.join(" "));
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Ok(Some(0))
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}
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"cd" => {
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let path = if expanded_args.is_empty() {
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std::env::var("HOME").unwrap_or_else(|_| ".".to_string())
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} else {
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expanded_args[0].clone()
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};
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if let Err(e) = std::env::set_current_dir(&path) {
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Err(format!("cd: {}", e))
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} else {
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Ok(Some(0))
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}
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}
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"exit" => std::process::exit(0),
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"export" => {
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for arg in expanded_args {
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let parts: Vec<&str> = arg.splitn(2, '=').collect();
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if parts.len() == 2 {
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std::env::set_var(parts[0], parts[1]);
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}
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}
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Ok(Some(0))
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}
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"jobs" => {
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let jobs = self.background_jobs.lock().unwrap();
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for (i, _) in jobs.iter().enumerate() {
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println!("[{}] Running", i + 1);
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}
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Ok(Some(0))
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}
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_ => {
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if let Some(func) = interpreter.functions.get(&expanded_name) {
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return interpreter.interpret_node(Box::new(func.clone()));
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}
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match Command::new(&expanded_name).args(&expanded_args).spawn() {
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Ok(mut child) => {
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let status = child.wait().map_err(|e| e.to_string())?;
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Ok(Some(status.code().unwrap_or(0)))
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}
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Err(e) => Err(format!("Failed to execute command: {}", e)),
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}
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}
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}
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}
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pub fn execute_pipeline(
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&self,
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interpreter: &Interpreter,
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commands: Vec<ASTNode>,
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) -> Result<Option<i32>, String> {
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let mut previous_stdout = None;
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let mut processes = Vec::new();
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for (i, command) in commands.iter().enumerate() {
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match command {
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ASTNode::Command { name, args } => {
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let mut cmd = Command::new(interpreter.expand_variables(name));
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for arg in args {
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cmd.arg(interpreter.expand_variables(arg));
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}
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if let Some(prev_stdout) = previous_stdout.take() {
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cmd.stdin(prev_stdout);
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}
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if i < commands.len() - 1 {
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cmd.stdout(Stdio::piped());
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}
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let mut child = cmd.spawn().map_err(|e| e.to_string())?;
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if i < commands.len() - 1 {
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previous_stdout = child.stdout.take();
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}
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processes.push(child);
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}
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_ => return Err("Pipeline can only contain commands".to_string()),
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}
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}
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let mut last_status = None;
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for mut process in processes {
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let status = process.wait().map_err(|e| e.to_string())?;
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last_status = Some(status.code().unwrap_or(0));
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}
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Ok(last_status)
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}
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pub fn execute_redirect(
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&self,
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interpreter: &mut Interpreter,
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node: ASTNode,
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direction: RedirectType,
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target: String,
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) -> Result<Option<i32>, String> {
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let target = interpreter.expand_variables(&target);
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match direction {
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RedirectType::Out => {
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let file = File::create(&target).map_err(|e| e.to_string())?;
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let mut writer = BufWriter::new(file);
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let result = self.capture_output(interpreter, Box::new(node))?;
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writer
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.write_all(result.as_bytes())
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.map_err(|e| e.to_string())?;
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Ok(Some(0))
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}
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RedirectType::Append => {
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let file = OpenOptions::new()
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.write(true)
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.append(true)
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.create(true)
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.open(&target)
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.map_err(|e| e.to_string())?;
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let mut writer = BufWriter::new(file);
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let result = self.capture_output(interpreter, Box::new(node))?;
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writer
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.write_all(result.as_bytes())
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.map_err(|e| e.to_string())?;
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Ok(Some(0))
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}
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RedirectType::In => {
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let file = File::open(&target).map_err(|e| e.to_string())?;
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let mut reader = BufReader::new(file);
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let mut input = String::new();
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reader
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.read_to_string(&mut input)
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.map_err(|e| e.to_string())?;
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self.execute_with_input(interpreter, Box::new(node), input)
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}
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}
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}
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fn capture_output(
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&self,
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interpreter: &mut Interpreter,
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node: Box<ASTNode>,
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) -> Result<String, String> {
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let old_stdout = io::stdout();
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let mut handle = old_stdout.lock();
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let mut buffer = Vec::new();
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{
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let mut cursor = Cursor::new(&mut buffer);
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let result = interpreter.interpret_node(node)?;
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writeln!(cursor, "{:?}", result).map_err(|e| e.to_string())?;
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}
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handle.write_all(&buffer).map_err(|e| e.to_string())?;
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String::from_utf8(buffer).map_err(|e| e.to_string())
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}
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fn execute_with_input(
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&self,
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interpreter: &mut Interpreter,
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node: Box<ASTNode>,
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input: String,
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) -> Result<Option<i32>, String> {
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std::env::set_var("BELLOS_INPUT", input);
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interpreter.interpret_node(node)
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}
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pub fn execute_background(&self, node: ASTNode) -> Result<Option<i32>, String> {
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let bg_jobs = Arc::clone(&self.background_jobs);
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// Create a new background process
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let child = Arc::new(Mutex::new(
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Command::new(std::env::current_exe().expect("Failed to get current executable path"))
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.arg("--execute-bellos-script")
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.stdin(Stdio::piped())
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.stdout(Stdio::null())
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.stderr(Stdio::null())
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.spawn()
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.map_err(|e| format!("Failed to spawn background process: {}", e))?,
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));
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// Add the new job to the list
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bg_jobs.lock().unwrap().push(Arc::clone(&child));
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thread::spawn(move || {
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let mut interpreter = Interpreter::new();
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if let Err(e) = interpreter.interpret_node(Box::new(node)) {
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eprintln!("Background job error: {}", e);
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}
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let mut jobs = bg_jobs.lock().unwrap();
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jobs.retain(|job| {
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let mut child = job.lock().unwrap();
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match child.try_wait() {
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Ok(Some(_)) => {
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println!("Job completed.");
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false // Job has completed, remove it
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}
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Ok(None) => {
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println!("Job still running.");
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true // Job is still running, keep it
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}
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Err(err) => {
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eprintln!("Error waiting for job: {}", err);
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false // Error occurred, remove the job
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}
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}
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});
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});
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Ok(None)
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}
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pub fn expand_wildcards(&self, pattern: &str) -> Vec<String> {
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match glob(pattern) {
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Ok(paths) => paths
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.filter_map(Result::ok)
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.map(|path| path.to_string_lossy().into_owned())
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.collect(),
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Err(_) => vec![pattern.to_string()],
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}
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}
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}
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