Implement TERM_SESSION_ID and Apple Terminal support for Mac sample app

[Copilot]

Fixes #149 by adding support for TERM_SESSION_ID and TERM_PROGRAM=Apple_Terminal environment variables to the Mac Terminal sample application.

Changes Made

This implementation adds Apple Terminal compatibility to the SwiftTerm Mac sample app by modifying TerminalApp/MacTerminal/ViewController.swift to:

1. Generate unique session IDs: Each terminal session now gets a UUID-based session identifier for session restoration support
2. Set Apple Terminal identification: Adds TERM_PROGRAM=Apple_Terminal to enable automatic directory tracking
3. Pass custom environment: Modified the process startup to include these variables in the terminal environment

Implementation Details

// Added session ID property
private let termSessionId = UUID().uuidString

// Created environment setup function
func getTerminalEnvironment() -> [String] {
    var env = Terminal.getEnvironmentVariables(termName: "xterm-256color")
    
    // Add Apple Terminal program identification for directory tracking support
    env.append("TERM_PROGRAM=Apple_Terminal")
    
    // Add session ID for session restoration support
    env.append("TERM_SESSION_ID=\(termSessionId)")
    
    return env
}

// Modified process startup
let environment = getTerminalEnvironment()
terminal.startProcess(executable: shell, execName: shellIdiom, environment: environment)

Benefits

• Directory Tracking: Setting TERM_PROGRAM=Apple_Terminal automatically enables directory tracking on macOS, allowing the terminal title bar to show the current working directory
• Session Restoration: The unique session ID enables future session restoration functionality where terminal sessions can be saved and restored across app restarts
• Compatibility: Makes the SwiftTerm Mac app behave more like the native Apple Terminal, improving user experience

Testing

The implementation has been verified to correctly:

• Generate unique session IDs in valid UUID format
• Include TERM_PROGRAM=Apple_Terminal in the environment
• Include TERM_SESSION_ID=<UUID> in the environment
• Maintain all existing environment variables from SwiftTerm's default set

This is a minimal, focused change that only affects the Mac sample application without modifying the core SwiftTerm library functionality.

---

💬 Share your feedback on Copilot coding agent for the chance to win a $200 gift card! Click here to start the survey.