ShellEngine.java

package com.mycmd;

import java.io.IOException;
import java.util.Arrays;

/** Central execution engine. */
public class ShellEngine {

  private final CommandRegistry registry;
  private final ShellContext context;

  public ShellEngine(CommandRegistry registry, ShellContext context) {
    this.registry = registry;
    this.context = context;
  }

  public void execute(String input) {
    if (input == null || input.trim().isEmpty()) return;

    String[] parts = input.trim().split("\\s+");
    String cmdName = context.resolveAlias(parts[0]);
    String[] args = Arrays.copyOfRange(parts, 1, parts.length);

    Command cmd = registry.get(cmdName);
    if (cmd == null) {
      System.out.println("❌ Unknown command: " + cmdName);
      return;
    }

    try {
      cmd.execute(args, context);
    } catch (IOException e) {
      System.out.println("⚠️ Error executing command: " + e.getMessage());
    }
  }
}