feat: Add process package to monorepo

- Add `sal-process` package for cross-platform process management.
- Update workspace members in `Cargo.toml`.
- Mark process package as complete in MONOREPO_CONVERSION_PLAN.md
- Remove license information from `mycelium` and `os` READMEs.

process/src/lib.rs

@@ -0,0 +1,22 @@
+//! # SAL Process Package
+//! 
+//! The `sal-process` package provides functionality for managing and interacting with
+//! system processes across different platforms. It includes capabilities for:
+//! 
+//! - Running commands and scripts
+//! - Listing and filtering processes
+//! - Killing processes
+//! - Checking for command existence
+//! - Screen session management
+//! 
+//! This package is designed to work consistently across Windows, macOS, and Linux.
+
+mod run;
+mod mgmt;
+mod screen;
+
+pub mod rhai;
+
+pub use run::*;
+pub use mgmt::*;
+pub use screen::{new as new_screen, kill as kill_screen};

process/src/mgmt.rs

@@ -0,0 +1,351 @@
+use std::error::Error;
+use std::fmt;
+use std::io;
+use std::process::Command;
+
+/// Error type for process management operations
+///
+/// This enum represents various errors that can occur during process management
+/// operations such as listing, finding, or killing processes.
+#[derive(Debug)]
+pub enum ProcessError {
+    /// An error occurred while executing a command
+    CommandExecutionFailed(io::Error),
+    /// A command executed successfully but returned an error
+    CommandFailed(String),
+    /// No process was found matching the specified pattern
+    NoProcessFound(String),
+    /// Multiple processes were found matching the specified pattern
+    MultipleProcessesFound(String, usize),
+}
+
+/// Implement Display for ProcessError to provide human-readable error messages
+impl fmt::Display for ProcessError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            ProcessError::CommandExecutionFailed(e) => {
+                write!(f, "Failed to execute command: {}", e)
+            }
+            ProcessError::CommandFailed(e) => write!(f, "{}", e),
+            ProcessError::NoProcessFound(pattern) => {
+                write!(f, "No processes found matching '{}'", pattern)
+            }
+            ProcessError::MultipleProcessesFound(pattern, count) => write!(
+                f,
+                "Multiple processes ({}) found matching '{}'",
+                count, pattern
+            ),
+        }
+    }
+}
+
+// Implement Error trait for ProcessError
+impl Error for ProcessError {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        match self {
+            ProcessError::CommandExecutionFailed(e) => Some(e),
+            _ => None,
+        }
+    }
+}
+
+// Define a struct to represent process information
+#[derive(Debug, Clone)]
+pub struct ProcessInfo {
+    pub pid: i64,
+    pub name: String,
+    pub memory: f64,
+    pub cpu: f64,
+}
+
+/**
+ * Check if a command exists in PATH.
+ *
+ * # Arguments
+ *
+ * * `cmd` - The command to check
+ *
+ * # Returns
+ *
+ * * `Option<String>` - The full path to the command if found, None otherwise
+ *
+ * # Examples
+ *
+ * ```
+ * use sal_process::which;
+ *
+ * match which("git") {
+ *     Some(path) => println!("Git is installed at: {}", path),
+ *     None => println!("Git is not installed"),
+ * }
+ * ```
+ */
+pub fn which(cmd: &str) -> Option<String> {
+    #[cfg(target_os = "windows")]
+    let which_cmd = "where";
+
+    #[cfg(any(target_os = "macos", target_os = "linux"))]
+    let which_cmd = "which";
+
+    let output = Command::new(which_cmd).arg(cmd).output();
+
+    match output {
+        Ok(out) => {
+            if out.status.success() {
+                let path = String::from_utf8_lossy(&out.stdout).trim().to_string();
+                Some(path)
+            } else {
+                None
+            }
+        }
+        Err(_) => None,
+    }
+}
+
+/**
+ * Kill processes matching a pattern.
+ *
+ * # Arguments
+ *
+ * * `pattern` - The pattern to match against process names
+ *
+ * # Returns
+ *
+ * * `Ok(String)` - A success message indicating processes were killed or none were found
+ * * `Err(ProcessError)` - An error if the kill operation failed
+ *
+ * # Examples
+ *
+ * ```
+ * // Kill all processes with "server" in their name
+ * use sal_process::kill;
+ *
+ * fn main() -> Result<(), Box<dyn std::error::Error>> {
+ *     let result = kill("server")?;
+ *     println!("{}", result);
+ *     Ok(())
+ * }
+ * ```
+ */
+pub fn kill(pattern: &str) -> Result<String, ProcessError> {
+    // Platform specific implementation
+    #[cfg(target_os = "windows")]
+    {
+        // On Windows, use taskkill with wildcard support
+        let mut args = vec!["/F"]; // Force kill
+
+        if pattern.contains('*') {
+            // If it contains wildcards, use filter
+            args.extend(&["/FI", &format!("IMAGENAME eq {}", pattern)]);
+        } else {
+            // Otherwise use image name directly
+            args.extend(&["/IM", pattern]);
+        }
+
+        let output = Command::new("taskkill")
+            .args(&args)
+            .output()
+            .map_err(ProcessError::CommandExecutionFailed)?;
+
+        if output.status.success() {
+            Ok("Successfully killed processes".to_string())
+        } else {
+            let error = String::from_utf8_lossy(&output.stderr);
+            if error.is_empty() {
+                let stdout = String::from_utf8_lossy(&output.stdout);
+                if stdout.contains("No tasks") {
+                    Ok("No matching processes found".to_string())
+                } else {
+                    Err(ProcessError::CommandFailed(format!(
+                        "Failed to kill processes: {}",
+                        stdout
+                    )))
+                }
+            } else {
+                Err(ProcessError::CommandFailed(format!(
+                    "Failed to kill processes: {}",
+                    error
+                )))
+            }
+        }
+    }
+
+    #[cfg(any(target_os = "macos", target_os = "linux"))]
+    {
+        // On Unix-like systems, use pkill which has built-in pattern matching
+        let output = Command::new("pkill")
+            .arg("-f") // Match against full process name/args
+            .arg(pattern)
+            .output()
+            .map_err(ProcessError::CommandExecutionFailed)?;
+
+        // pkill returns 0 if processes were killed, 1 if none matched
+        if output.status.success() {
+            Ok("Successfully killed processes".to_string())
+        } else if output.status.code() == Some(1) {
+            Ok("No matching processes found".to_string())
+        } else {
+            let error = String::from_utf8_lossy(&output.stderr);
+            Err(ProcessError::CommandFailed(format!(
+                "Failed to kill processes: {}",
+                error
+            )))
+        }
+    }
+}
+
+/**
+ * List processes matching a pattern (or all if pattern is empty).
+ *
+ * # Arguments
+ *
+ * * `pattern` - The pattern to match against process names (empty string for all processes)
+ *
+ * # Returns
+ *
+ * * `Ok(Vec<ProcessInfo>)` - A vector of process information for matching processes
+ * * `Err(ProcessError)` - An error if the list operation failed
+ *
+ * # Examples
+ *
+ * ```
+ * // List all processes
+ * use sal_process::process_list;
+ *
+ * fn main() -> Result<(), Box<dyn std::error::Error>> {
+ *     let processes = process_list("")?;
+ *
+ *     // List processes with "server" in their name
+ *     let processes = process_list("server")?;
+ *     for proc in processes {
+ *         println!("PID: {}, Name: {}", proc.pid, proc.name);
+ *     }
+ *     Ok(())
+ * }
+ * ```
+ */
+pub fn process_list(pattern: &str) -> Result<Vec<ProcessInfo>, ProcessError> {
+    let mut processes = Vec::new();
+
+    // Platform specific implementations
+    #[cfg(target_os = "windows")]
+    {
+        // Windows implementation using wmic
+        let output = Command::new("wmic")
+            .args(&["process", "list", "brief"])
+            .output()
+            .map_err(ProcessError::CommandExecutionFailed)?;
+
+        if output.status.success() {
+            let stdout = String::from_utf8_lossy(&output.stdout).to_string();
+
+            // Parse output (assuming format: Handle Name Priority)
+            for line in stdout.lines().skip(1) {
+                // Skip header
+                let parts: Vec<&str> = line.trim().split_whitespace().collect();
+                if parts.len() >= 2 {
+                    let pid = parts[0].parse::<i64>().unwrap_or(0);
+                    let name = parts[1].to_string();
+
+                    // Filter by pattern if provided
+                    if !pattern.is_empty() && !name.contains(pattern) {
+                        continue;
+                    }
+
+                    processes.push(ProcessInfo {
+                        pid,
+                        name,
+                        memory: 0.0, // Placeholder
+                        cpu: 0.0,    // Placeholder
+                    });
+                }
+            }
+        } else {
+            let stderr = String::from_utf8_lossy(&output.stderr).to_string();
+            return Err(ProcessError::CommandFailed(format!(
+                "Failed to list processes: {}",
+                stderr
+            )));
+        }
+    }
+
+    #[cfg(any(target_os = "macos", target_os = "linux"))]
+    {
+        // Unix implementation using ps
+        let output = Command::new("ps")
+            .args(&["-eo", "pid,comm"])
+            .output()
+            .map_err(ProcessError::CommandExecutionFailed)?;
+
+        if output.status.success() {
+            let stdout = String::from_utf8_lossy(&output.stdout).to_string();
+
+            // Parse output (assuming format: PID COMMAND)
+            for line in stdout.lines().skip(1) {
+                // Skip header
+                let parts: Vec<&str> = line.trim().split_whitespace().collect();
+                if parts.len() >= 2 {
+                    let pid = parts[0].parse::<i64>().unwrap_or(0);
+                    let name = parts[1].to_string();
+
+                    // Filter by pattern if provided
+                    if !pattern.is_empty() && !name.contains(pattern) {
+                        continue;
+                    }
+
+                    processes.push(ProcessInfo {
+                        pid,
+                        name,
+                        memory: 0.0, // Placeholder
+                        cpu: 0.0,    // Placeholder
+                    });
+                }
+            }
+        } else {
+            let stderr = String::from_utf8_lossy(&output.stderr).to_string();
+            return Err(ProcessError::CommandFailed(format!(
+                "Failed to list processes: {}",
+                stderr
+            )));
+        }
+    }
+
+    Ok(processes)
+}
+
+/**
+ * Get a single process matching the pattern (error if 0 or more than 1 match).
+ *
+ * # Arguments
+ *
+ * * `pattern` - The pattern to match against process names
+ *
+ * # Returns
+ *
+ * * `Ok(ProcessInfo)` - Information about the matching process
+ * * `Err(ProcessError)` - An error if no process or multiple processes match
+ *
+ * # Examples
+ *
+ * ```no_run
+ * use sal_process::process_get;
+ *
+ * fn main() -> Result<(), Box<dyn std::error::Error>> {
+ *     let process = process_get("unique-server-name")?;
+ *     println!("Found process: {} (PID: {})", process.name, process.pid);
+ *     Ok(())
+ * }
+ * ```
+ */
+pub fn process_get(pattern: &str) -> Result<ProcessInfo, ProcessError> {
+    let processes = process_list(pattern)?;
+
+    match processes.len() {
+        0 => Err(ProcessError::NoProcessFound(pattern.to_string())),
+        1 => Ok(processes[0].clone()),
+        _ => Err(ProcessError::MultipleProcessesFound(
+            pattern.to_string(),
+            processes.len(),
+        )),
+    }
+}

process/src/rhai.rs

@@ -0,0 +1,212 @@
+//! Rhai wrappers for Process module functions
+//!
+//! This module provides Rhai wrappers for the functions in the Process module.
+
+use crate::{self as process, CommandResult, ProcessError, ProcessInfo, RunError};
+use rhai::{Array, Dynamic, Engine, EvalAltResult, Map};
+use std::clone::Clone;
+
+/// Register Process module functions with the Rhai engine
+///
+/// # Arguments
+///
+/// * `engine` - The Rhai engine to register the functions with
+///
+/// # Returns
+///
+/// * `Result<(), Box<EvalAltResult>>` - Ok if registration was successful, Err otherwise
+pub fn register_process_module(engine: &mut Engine) -> Result<(), Box<EvalAltResult>> {
+    // Register types
+    // register_process_types(engine)?; // Removed
+
+    // Register CommandResult type and its methods
+    engine.register_type_with_name::<CommandResult>("CommandResult");
+    engine.register_get("stdout", |r: &mut CommandResult| r.stdout.clone());
+    engine.register_get("stderr", |r: &mut CommandResult| r.stderr.clone());
+    engine.register_get("success", |r: &mut CommandResult| r.success);
+    engine.register_get("code", |r: &mut CommandResult| r.code);
+
+    // Register ProcessInfo type and its methods
+    engine.register_type_with_name::<ProcessInfo>("ProcessInfo");
+    engine.register_get("pid", |p: &mut ProcessInfo| p.pid);
+    engine.register_get("name", |p: &mut ProcessInfo| p.name.clone());
+    engine.register_get("memory", |p: &mut ProcessInfo| p.memory);
+    engine.register_get("cpu", |p: &mut ProcessInfo| p.cpu);
+
+    // Register CommandBuilder type and its methods
+    engine.register_type_with_name::<RhaiCommandBuilder>("CommandBuilder");
+    engine.register_fn("run", RhaiCommandBuilder::new_rhai); // This is the builder entry point
+    engine.register_fn("silent", RhaiCommandBuilder::silent); // Method on CommandBuilder
+    engine.register_fn("ignore_error", RhaiCommandBuilder::ignore_error); // Method on CommandBuilder
+    engine.register_fn("log", RhaiCommandBuilder::log); // Method on CommandBuilder
+    engine.register_fn("execute", RhaiCommandBuilder::execute_command); // Method on CommandBuilder
+
+    // Register other process management functions
+    engine.register_fn("which", which);
+    engine.register_fn("kill", kill);
+    engine.register_fn("process_list", process_list);
+    engine.register_fn("process_get", process_get);
+
+    // Register legacy functions for backward compatibility
+    engine.register_fn("run_command", run_command);
+    engine.register_fn("run_silent", run_silent);
+    engine.register_fn("run", run_with_options);
+
+    Ok(())
+}
+
+// Helper functions for error conversion
+fn run_error_to_rhai_error<T>(result: Result<T, RunError>) -> Result<T, Box<EvalAltResult>> {
+    result.map_err(|e| {
+        Box::new(EvalAltResult::ErrorRuntime(
+            format!("Run error: {}", e).into(),
+            rhai::Position::NONE,
+        ))
+    })
+}
+
+// Define a Rhai-facing builder struct
+#[derive(Clone)]
+struct RhaiCommandBuilder {
+    command: String,
+    die_on_error: bool,
+    is_silent: bool,
+    enable_log: bool,
+}
+
+impl RhaiCommandBuilder {
+    // Constructor function for Rhai (registered as `run`)
+    pub fn new_rhai(command: &str) -> Self {
+        Self {
+            command: command.to_string(),
+            die_on_error: true, // Default: die on error
+            is_silent: false,
+            enable_log: false,
+        }
+    }
+
+    // Rhai method: .silent()
+    pub fn silent(mut self) -> Self {
+        self.is_silent = true;
+        self
+    }
+
+    // Rhai method: .ignore_error()
+    pub fn ignore_error(mut self) -> Self {
+        self.die_on_error = false;
+        self
+    }
+
+    // Rhai method: .log()
+    pub fn log(mut self) -> Self {
+        self.enable_log = true;
+        self
+    }
+
+    // Rhai method: .execute() - Execute the command
+    pub fn execute_command(self) -> Result<CommandResult, Box<EvalAltResult>> {
+        let builder = process::run(&self.command)
+            .die(self.die_on_error)
+            .silent(self.is_silent)
+            .log(self.enable_log);
+
+        // Execute the command
+        run_error_to_rhai_error(builder.execute())
+    }
+}
+
+fn process_error_to_rhai_error<T>(
+    result: Result<T, ProcessError>,
+) -> Result<T, Box<EvalAltResult>> {
+    result.map_err(|e| {
+        Box::new(EvalAltResult::ErrorRuntime(
+            format!("Process error: {}", e).into(),
+            rhai::Position::NONE,
+        ))
+    })
+}
+
+//
+// Process Management Function Wrappers
+//
+
+/// Wrapper for process::which
+///
+/// Check if a command exists in PATH.
+pub fn which(cmd: &str) -> Dynamic {
+    match process::which(cmd) {
+        Some(path) => path.into(),
+        None => Dynamic::UNIT,
+    }
+}
+
+/// Wrapper for process::kill
+///
+/// Kill processes matching a pattern.
+pub fn kill(pattern: &str) -> Result<String, Box<EvalAltResult>> {
+    process_error_to_rhai_error(process::kill(pattern))
+}
+
+/// Wrapper for process::process_list
+///
+/// List processes matching a pattern (or all if pattern is empty).
+pub fn process_list(pattern: &str) -> Result<Array, Box<EvalAltResult>> {
+    let processes = process_error_to_rhai_error(process::process_list(pattern))?;
+
+    // Convert Vec<ProcessInfo> to Rhai Array
+    let mut array = Array::new();
+    for process in processes {
+        array.push(Dynamic::from(process));
+    }
+
+    Ok(array)
+}
+
+/// Wrapper for process::process_get
+///
+/// Get a single process matching the pattern (error if 0 or more than 1 match).
+pub fn process_get(pattern: &str) -> Result<ProcessInfo, Box<EvalAltResult>> {
+    process_error_to_rhai_error(process::process_get(pattern))
+}
+
+/// Legacy wrapper for process::run
+///
+/// Run a command and return the result.
+pub fn run_command(cmd: &str) -> Result<CommandResult, Box<EvalAltResult>> {
+    run_error_to_rhai_error(process::run(cmd).execute())
+}
+
+/// Legacy wrapper for process::run with silent option
+///
+/// Run a command silently and return the result.
+pub fn run_silent(cmd: &str) -> Result<CommandResult, Box<EvalAltResult>> {
+    run_error_to_rhai_error(process::run(cmd).silent(true).execute())
+}
+
+/// Legacy wrapper for process::run with options
+///
+/// Run a command with options and return the result.
+pub fn run_with_options(cmd: &str, options: Map) -> Result<CommandResult, Box<EvalAltResult>> {
+    let mut builder = process::run(cmd);
+
+    // Apply options
+    if let Some(silent) = options.get("silent") {
+        if let Ok(silent_bool) = silent.as_bool() {
+            builder = builder.silent(silent_bool);
+        }
+    }
+
+    if let Some(die) = options.get("die") {
+        if let Ok(die_bool) = die.as_bool() {
+            builder = builder.die(die_bool);
+        }
+    }
+
+    if let Some(log) = options.get("log") {
+        if let Ok(log_bool) = log.as_bool() {
+            builder = builder.log(log_bool);
+        }
+    }
+
+    run_error_to_rhai_error(builder.execute())
+}

process/src/run.rs

@@ -0,0 +1,535 @@
+use std::error::Error;
+use std::fmt;
+use std::fs::{self, File};
+use std::io;
+use std::io::{BufRead, BufReader, Write};
+use std::path::{Path, PathBuf};
+use std::process::{Child, Command, Output, Stdio};
+use std::thread;
+
+use sal_text;
+
+/// Error type for command and script execution operations
+#[derive(Debug)]
+pub enum RunError {
+    /// The command string was empty
+    EmptyCommand,
+    /// An error occurred while executing a command
+    CommandExecutionFailed(io::Error),
+    /// A command executed successfully but returned an error
+    CommandFailed(String),
+    /// An error occurred while preparing a script for execution
+    ScriptPreparationFailed(String),
+    /// An error occurred in a child process
+    ChildProcessError(String),
+    /// Failed to create a temporary directory
+    TempDirCreationFailed(io::Error),
+    /// Failed to create a script file
+    FileCreationFailed(io::Error),
+    /// Failed to write to a script file
+    FileWriteFailed(io::Error),
+    /// Failed to set file permissions
+    PermissionError(io::Error),
+}
+
+/// Implement Display for RunError to provide human-readable error messages
+impl fmt::Display for RunError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            RunError::EmptyCommand => write!(f, "Empty command"),
+            RunError::CommandExecutionFailed(e) => write!(f, "Failed to execute command: {}", e),
+            RunError::CommandFailed(e) => write!(f, "{}", e),
+            RunError::ScriptPreparationFailed(e) => write!(f, "{}", e),
+            RunError::ChildProcessError(e) => write!(f, "{}", e),
+            RunError::TempDirCreationFailed(e) => {
+                write!(f, "Failed to create temporary directory: {}", e)
+            }
+            RunError::FileCreationFailed(e) => write!(f, "Failed to create script file: {}", e),
+            RunError::FileWriteFailed(e) => write!(f, "Failed to write to script file: {}", e),
+            RunError::PermissionError(e) => write!(f, "Failed to set file permissions: {}", e),
+        }
+    }
+}
+
+// Implement Error trait for RunError
+impl Error for RunError {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        match self {
+            RunError::CommandExecutionFailed(e) => Some(e),
+            RunError::TempDirCreationFailed(e) => Some(e),
+            RunError::FileCreationFailed(e) => Some(e),
+            RunError::FileWriteFailed(e) => Some(e),
+            RunError::PermissionError(e) => Some(e),
+            _ => None,
+        }
+    }
+}
+
+/// A structure to hold command execution results
+#[derive(Debug, Clone)]
+pub struct CommandResult {
+    pub stdout: String,
+    pub stderr: String,
+    pub success: bool,
+    pub code: i32,
+}
+
+impl CommandResult {
+    // Implementation methods can be added here as needed
+}
+
+/// Prepare a script file and return the path and interpreter
+fn prepare_script_file(
+    script_content: &str,
+) -> Result<(PathBuf, String, tempfile::TempDir), RunError> {
+    // Dedent the script
+    let dedented = sal_text::dedent(script_content);
+
+    // Create a temporary directory
+    let temp_dir = tempfile::tempdir().map_err(RunError::TempDirCreationFailed)?;
+
+    // Determine script extension and interpreter
+    #[cfg(target_os = "windows")]
+    let (ext, interpreter) = (".bat", "cmd.exe".to_string());
+
+    #[cfg(any(target_os = "macos", target_os = "linux"))]
+    let (ext, interpreter) = (".sh", "/bin/bash".to_string());
+
+    // Create the script file
+    let script_path = temp_dir.path().join(format!("script{}", ext));
+    let mut file = File::create(&script_path).map_err(RunError::FileCreationFailed)?;
+
+    // For Unix systems, ensure the script has a shebang line with -e flag
+    #[cfg(any(target_os = "macos", target_os = "linux"))]
+    {
+        let script_with_shebang = if dedented.trim_start().starts_with("#!") {
+            // Script already has a shebang, use it as is
+            dedented
+        } else {
+            // Add shebang with -e flag to ensure script fails on errors
+            format!("#!/bin/bash -e\n{}", dedented)
+        };
+
+        // Write the script content with shebang
+        file.write_all(script_with_shebang.as_bytes())
+            .map_err(RunError::FileWriteFailed)?;
+    }
+
+    // For Windows, just write the script as is
+    #[cfg(target_os = "windows")]
+    {
+        file.write_all(dedented.as_bytes())
+            .map_err(RunError::FileWriteFailed)?;
+    }
+
+    // Make the script executable (Unix only)
+    #[cfg(any(target_os = "macos", target_os = "linux"))]
+    {
+        use std::os::unix::fs::PermissionsExt;
+        let mut perms = fs::metadata(&script_path)
+            .map_err(|e| RunError::PermissionError(e))?
+            .permissions();
+        perms.set_mode(0o755); // rwxr-xr-x
+        fs::set_permissions(&script_path, perms).map_err(RunError::PermissionError)?;
+    }
+
+    Ok((script_path, interpreter, temp_dir))
+}
+
+/// Capture output from Child's stdio streams with optional printing
+fn handle_child_output(mut child: Child, silent: bool) -> Result<CommandResult, RunError> {
+    // Prepare to read stdout & stderr line-by-line
+    let stdout = child.stdout.take();
+    let stderr = child.stderr.take();
+
+    // Process stdout
+    let stdout_handle = if let Some(out) = stdout {
+        let reader = BufReader::new(out);
+        let silent_clone = silent;
+        // Spawn a thread to capture and optionally print stdout
+        Some(std::thread::spawn(move || {
+            let mut local_buffer = String::new();
+            for line in reader.lines() {
+                if let Ok(l) = line {
+                    // Print the line if not silent and flush immediately
+                    if !silent_clone {
+                        println!("{}", l);
+                        std::io::stdout().flush().unwrap_or(());
+                    }
+                    // Store it in our captured buffer
+                    local_buffer.push_str(&l);
+                    local_buffer.push('\n');
+                }
+            }
+            local_buffer
+        }))
+    } else {
+        None
+    };
+
+    // Process stderr
+    let stderr_handle = if let Some(err) = stderr {
+        let reader = BufReader::new(err);
+        let silent_clone = silent;
+        // Spawn a thread to capture and optionally print stderr
+        Some(std::thread::spawn(move || {
+            let mut local_buffer = String::new();
+            for line in reader.lines() {
+                if let Ok(l) = line {
+                    // Print the line if not silent and flush immediately
+                    if !silent_clone {
+                        // Print all stderr messages
+                        eprintln!("\x1b[31mERROR: {}\x1b[0m", l); // Red color for errors
+                        std::io::stderr().flush().unwrap_or(());
+                    }
+                    // Store it in our captured buffer
+                    local_buffer.push_str(&l);
+                    local_buffer.push('\n');
+                }
+            }
+            local_buffer
+        }))
+    } else {
+        None
+    };
+
+    // Wait for the child process to exit
+    let status = child.wait().map_err(|e| {
+        RunError::ChildProcessError(format!("Failed to wait on child process: {}", e))
+    })?;
+
+    // Join our stdout thread if it exists
+    let captured_stdout = if let Some(handle) = stdout_handle {
+        handle.join().unwrap_or_default()
+    } else {
+        "Failed to capture stdout".to_string()
+    };
+
+    // Join our stderr thread if it exists
+    let captured_stderr = if let Some(handle) = stderr_handle {
+        handle.join().unwrap_or_default()
+    } else {
+        "Failed to capture stderr".to_string()
+    };
+
+    // If the command failed, print the stderr if it wasn't already printed
+    if !status.success() && silent && !captured_stderr.is_empty() {
+        eprintln!("\x1b[31mCommand failed with error:\x1b[0m");
+        for line in captured_stderr.lines() {
+            eprintln!("\x1b[31m{}\x1b[0m", line);
+        }
+    }
+
+    // Return the command result
+    Ok(CommandResult {
+        stdout: captured_stdout,
+        stderr: captured_stderr,
+        success: status.success(),
+        code: status.code().unwrap_or(-1),
+    })
+}
+
+/// Processes Output structure from Command::output() into CommandResult
+fn process_command_output(
+    output: Result<Output, std::io::Error>,
+) -> Result<CommandResult, RunError> {
+    match output {
+        Ok(out) => {
+            let stdout = String::from_utf8_lossy(&out.stdout).to_string();
+            let stderr = String::from_utf8_lossy(&out.stderr).to_string();
+            // We'll collect stderr but not print it here
+            // It will be included in the error message if the command fails
+
+            // If the command failed, print a clear error message
+            if !out.status.success() {
+                eprintln!(
+                    "\x1b[31mCommand failed with exit code: {}\x1b[0m",
+                    out.status.code().unwrap_or(-1)
+                );
+            }
+
+            Ok(CommandResult {
+                stdout,
+                stderr,
+                success: out.status.success(),
+                code: out.status.code().unwrap_or(-1),
+            })
+        }
+        Err(e) => Err(RunError::CommandExecutionFailed(e)),
+    }
+}
+
+/// Common logic for running a command with optional silent mode
+fn run_command_internal(command: &str, silent: bool) -> Result<CommandResult, RunError> {
+    let mut parts = command.split_whitespace();
+    let cmd = match parts.next() {
+        Some(c) => c,
+        None => return Err(RunError::EmptyCommand),
+    };
+
+    let args: Vec<&str> = parts.collect();
+
+    // Spawn the child process with piped stdout & stderr
+    let child = Command::new(cmd)
+        .args(&args)
+        .stdout(Stdio::piped())
+        .stderr(Stdio::piped())
+        .spawn()
+        .map_err(RunError::CommandExecutionFailed)?;
+
+    handle_child_output(child, silent)
+}
+
+/// Execute a script with the given interpreter and path
+fn execute_script_internal(
+    interpreter: &str,
+    script_path: &Path,
+    silent: bool,
+) -> Result<CommandResult, RunError> {
+    #[cfg(target_os = "windows")]
+    let command_args = vec!["/c", script_path.to_str().unwrap_or("")];
+
+    #[cfg(any(target_os = "macos", target_os = "linux"))]
+    let command_args = vec!["-e", script_path.to_str().unwrap_or("")];
+
+    if silent {
+        // For silent execution, use output() which captures but doesn't display
+        let output = Command::new(interpreter).args(&command_args).output();
+
+        let result = process_command_output(output)?;
+
+        // If the script failed, return an error
+        if !result.success {
+            return Err(RunError::CommandFailed(format!(
+                "Script execution failed with exit code {}: {}",
+                result.code,
+                result.stderr.trim()
+            )));
+        }
+
+        Ok(result)
+    } else {
+        // For normal execution, spawn and handle the output streams
+        let child = Command::new(interpreter)
+            .args(&command_args)
+            .stdout(Stdio::piped())
+            .stderr(Stdio::piped())
+            .spawn()
+            .map_err(RunError::CommandExecutionFailed)?;
+
+        let result = handle_child_output(child, false)?;
+
+        // If the script failed, return an error
+        if !result.success {
+            return Err(RunError::CommandFailed(format!(
+                "Script execution failed with exit code {}: {}",
+                result.code,
+                result.stderr.trim()
+            )));
+        }
+
+        Ok(result)
+    }
+}
+
+/// Run a multiline script with optional silent mode
+fn run_script_internal(script: &str, silent: bool) -> Result<CommandResult, RunError> {
+    // Prepare the script file first to get the content with shebang
+    let (script_path, interpreter, _temp_dir) = prepare_script_file(script)?;
+
+    // Print the script being executed if not silent
+    if !silent {
+        println!("\x1b[36mExecuting script:\x1b[0m");
+
+        // Read the script file to get the content with shebang
+        if let Ok(script_content) = fs::read_to_string(&script_path) {
+            for (i, line) in script_content.lines().enumerate() {
+                println!("\x1b[36m{:3}: {}\x1b[0m", i + 1, line);
+            }
+        } else {
+            // Fallback to original script if reading fails
+            for (i, line) in script.lines().enumerate() {
+                println!("\x1b[36m{:3}: {}\x1b[0m", i + 1, line);
+            }
+        }
+
+        println!("\x1b[36m---\x1b[0m");
+    }
+
+    // _temp_dir is kept in scope until the end of this function to ensure
+    // it's not dropped prematurely, which would clean up the directory
+
+    // Execute the script and handle the result
+    let result = execute_script_internal(&interpreter, &script_path, silent);
+
+    // If there was an error, print a clear error message only if it's not a CommandFailed error
+    // (which would already have printed the stderr)
+    if let Err(ref e) = result {
+        if !matches!(e, RunError::CommandFailed(_)) {
+            eprintln!("\x1b[31mScript execution failed: {}\x1b[0m", e);
+        }
+    }
+
+    result
+}
+
+/// A builder for configuring and executing commands or scripts
+pub struct RunBuilder<'a> {
+    /// The command or script to run
+    cmd: &'a str,
+    /// Whether to return an error if the command fails (default: true)
+    die: bool,
+    /// Whether to suppress output to stdout/stderr (default: false)
+    silent: bool,
+    /// Whether to run the command asynchronously (default: false)
+    async_exec: bool,
+    /// Whether to log command execution (default: false)
+    log: bool,
+}
+
+impl<'a> RunBuilder<'a> {
+    /// Create a new RunBuilder with default settings
+    pub fn new(cmd: &'a str) -> Self {
+        Self {
+            cmd,
+            die: true,
+            silent: false,
+            async_exec: false,
+            log: false,
+        }
+    }
+
+    /// Set whether to return an error if the command fails
+    pub fn die(mut self, die: bool) -> Self {
+        self.die = die;
+        self
+    }
+
+    /// Set whether to suppress output to stdout/stderr
+    pub fn silent(mut self, silent: bool) -> Self {
+        self.silent = silent;
+        self
+    }
+
+    /// Set whether to run the command asynchronously
+    pub fn async_exec(mut self, async_exec: bool) -> Self {
+        self.async_exec = async_exec;
+        self
+    }
+
+    /// Set whether to log command execution
+    pub fn log(mut self, log: bool) -> Self {
+        self.log = log;
+        self
+    }
+
+    /// Execute the command or script with the configured options
+    pub fn execute(self) -> Result<CommandResult, RunError> {
+        let trimmed = self.cmd.trim();
+
+        // Log command execution if enabled
+        if self.log {
+            println!("\x1b[36m[LOG] Executing command: {}\x1b[0m", trimmed);
+        }
+
+        // Handle async execution
+        if self.async_exec {
+            let cmd_copy = trimmed.to_string();
+            let silent = self.silent;
+            let log = self.log;
+
+            // Spawn a thread to run the command asynchronously
+            thread::spawn(move || {
+                if log {
+                    println!("\x1b[36m[ASYNC] Starting execution\x1b[0m");
+                }
+
+                let result = if cmd_copy.contains('\n') {
+                    run_script_internal(&cmd_copy, silent)
+                } else {
+                    run_command_internal(&cmd_copy, silent)
+                };
+
+                if log {
+                    match &result {
+                        Ok(res) => {
+                            if res.success {
+                                println!("\x1b[32m[ASYNC] Command completed successfully\x1b[0m");
+                            } else {
+                                eprintln!(
+                                    "\x1b[31m[ASYNC] Command failed with exit code: {}\x1b[0m",
+                                    res.code
+                                );
+                            }
+                        }
+                        Err(e) => {
+                            eprintln!("\x1b[31m[ASYNC] Command failed with error: {}\x1b[0m", e);
+                        }
+                    }
+                }
+            });
+
+            // Return a placeholder result for async execution
+            return Ok(CommandResult {
+                stdout: String::new(),
+                stderr: String::new(),
+                success: true,
+                code: 0,
+            });
+        }
+
+        // Execute the command or script
+        let result = if trimmed.contains('\n') {
+            // This is a multiline script
+            run_script_internal(trimmed, self.silent)
+        } else {
+            // This is a single command
+            run_command_internal(trimmed, self.silent)
+        };
+
+        // Handle die=false: convert errors to CommandResult with success=false
+        match result {
+            Ok(res) => {
+                // If the command failed but die is false, print a warning
+                if !res.success && !self.die && !self.silent {
+                    eprintln!("\x1b[33mWarning: Command failed with exit code {} but 'die' is false\x1b[0m", res.code);
+                }
+                Ok(res)
+            }
+            Err(e) => {
+                // Print the error only if it's not a CommandFailed error
+                // (which would already have printed the stderr)
+                if !matches!(e, RunError::CommandFailed(_)) {
+                    eprintln!("\x1b[31mCommand error: {}\x1b[0m", e);
+                }
+
+                if self.die {
+                    Err(e)
+                } else {
+                    // Convert error to CommandResult with success=false
+                    Ok(CommandResult {
+                        stdout: String::new(),
+                        stderr: format!("Error: {}", e),
+                        success: false,
+                        code: -1,
+                    })
+                }
+            }
+        }
+    }
+}
+
+/// Create a new RunBuilder for executing a command or script
+pub fn run(cmd: &str) -> RunBuilder {
+    RunBuilder::new(cmd)
+}
+
+/// Run a command or multiline script with arguments
+pub fn run_command(command: &str) -> Result<CommandResult, RunError> {
+    run(command).execute()
+}
+
+/// Run a command or multiline script with arguments silently
+pub fn run_silent(command: &str) -> Result<CommandResult, RunError> {
+    run(command).silent(true).execute()
+}

process/src/screen.rs

@@ -0,0 +1,49 @@
+use crate::run_command;
+use anyhow::Result;
+use std::fs;
+
+/// Executes a command in a new screen session.
+///
+/// # Arguments
+///
+/// * `name` - The name of the screen session.
+/// * `cmd` - The command to execute.
+///
+/// # Returns
+///
+/// * `Result<()>` - Ok if the command was executed successfully, otherwise an error.
+pub fn new(name: &str, cmd: &str) -> Result<()> {
+    let script_path = format!("/tmp/cmd_{}.sh", name);
+    let mut script_content = String::new();
+
+    if !cmd.starts_with("#!") {
+        script_content.push_str("#!/bin/bash\n");
+    }
+
+    script_content.push_str("set -e\n");
+    script_content.push_str(cmd);
+
+    fs::write(&script_path, script_content)?;
+    fs::set_permissions(&script_path, std::os::unix::fs::PermissionsExt::from_mode(0o755))?;
+
+    let screen_cmd = format!("screen -d -m -S {} {}", name, script_path);
+    run_command(&screen_cmd)?;
+
+    Ok(())
+}
+
+/// Kills a screen session.
+///
+/// # Arguments
+///
+/// * `name` - The name of the screen session to kill.
+///
+/// # Returns
+///
+/// * `Result<()>` - Ok if the session was killed successfully, otherwise an error.
+pub fn kill(name: &str) -> Result<()> {
+    let cmd = format!("screen -S {} -X quit", name);
+    run_command(&cmd)?;
+    std::thread::sleep(std::time::Duration::from_millis(500));
+    Ok(())
+}