Event Hooks

def set_startup_hook(function=None):
    """
    Set or remove the startup_hook function.
    
    Parameters:
    - function (callable, optional): Function called with no arguments just before
                                   readline prints the first prompt. If None, removes hook.
    
    Returns:
    None
    """

import readline
import os
import time

def startup_initialization():
    """Initialize readline environment at startup"""
    # Load custom history file
    history_file = os.path.expanduser('~/.myapp_history')
    try:
        readline.read_history_file(history_file)
    except FileNotFoundError:
        pass
    
    # Set up custom completion
    readline.parse_and_bind('tab: complete')
    
    # Display welcome message
    print(f"Welcome! Loaded {readline.get_current_history_length()} history entries.")
    print("Type 'help' for available commands.")

# Set startup hook
readline.set_startup_hook(startup_initialization)

# The hook will be called before the first input() call
user_input = input("Command: ")

def set_pre_input_hook(function=None):
    """
    Set or remove the pre_input_hook function.
    
    Parameters:
    - function (callable, optional): Function called with no arguments after the first
                                   prompt has been printed and just before readline starts
                                   reading input characters. If None, removes hook.
    
    Returns:
    None
    
    Note: Only available when compiled with HAVE_RL_PRE_INPUT_HOOK
    """

import readline
import datetime

def pre_input_setup():
    """Set up command line before input begins"""
    # Insert timestamp prefix
    timestamp = datetime.datetime.now().strftime("%H:%M ")
    readline.insert_text(f"[{timestamp}] ")
    
    # Or insert last command for editing
    history_length = readline.get_current_history_length()
    if history_length > 0:
        last_command = readline.get_history_item(history_length)
        if last_command and last_command.startswith("repeat:"):
            # Remove "repeat:" prefix and insert the command
            command = last_command[7:]  # Remove "repeat:" prefix
            readline.insert_text(command)

# Set pre-input hook
readline.set_pre_input_hook(pre_input_setup)

# Hook executes after prompt is shown but before input starts
command = input("CMD> ")

import readline
import os

class SmartPreInput:
    def __init__(self):
        self.context_aware = True
        self.auto_suggest = True
    
    def setup_input(self):
        """Intelligent pre-input setup based on context"""
        if not self.context_aware:
            return
        
        # Check current directory for context clues
        current_dir = os.getcwd()
        files = os.listdir(current_dir)
        
        # Auto-suggest based on directory contents
        if 'Makefile' in files:
            readline.insert_text("make ")
        elif 'package.json' in files:
            readline.insert_text("npm ")
        elif 'requirements.txt' in files:
            readline.insert_text("pip install -r requirements.txt")
        elif 'setup.py' in files:
            readline.insert_text("python setup.py ")
        elif any(f.endswith('.py') for f in files):
            py_files = [f for f in files if f.endswith('.py')]
            if 'main.py' in py_files:
                readline.insert_text("python main.py ")
            else:
                readline.insert_text("python ")

smart_input = SmartPreInput()
readline.set_pre_input_hook(smart_input.setup_input)

def set_completion_display_matches_hook(function=None):
    """
    Set or remove the completion display function.
    
    Parameters:
    - function (callable, optional): Function called as function(substitution, matches, 
                                   longest_match_length) when displaying completion matches.
                                   If None, removes hook.
    
    Returns:
    None
    """

import readline

def custom_completion_display(substitution, matches, longest_match_length):
    """Custom completion display with enhanced formatting"""
    print(f"\n📋 {len(matches)} completions for '{substitution}':")
    
    # Group matches by type or category
    files = []
    dirs = []
    commands = []
    
    for match in matches:
        if match.endswith('/'):
            dirs.append(match)
        elif '.' in match:
            files.append(match)
        else:
            commands.append(match)
    
    # Display grouped results
    if dirs:
        print("  📁 Directories:")
        for d in dirs[:5]:  # Show first 5
            print(f"    {d}")
        if len(dirs) > 5:
            print(f"    ... and {len(dirs) - 5} more directories")
    
    if files:
        print("  📄 Files:")
        for f in files[:5]:
            print(f"    {f}")
        if len(files) > 5:
            print(f"    ... and {len(files) - 5} more files")
    
    if commands:
        print("  ⚡ Commands:")
        for c in commands[:5]:
            print(f"    {c}")
        if len(commands) > 5:
            print(f"    ... and {len(commands) - 5} more commands")
    
    print()  # Extra line for readability

# Set custom display hook
readline.set_completion_display_matches_hook(custom_completion_display)

import readline
import os
import stat

def detailed_completion_display(substitution, matches, longest_match_length):
    """Detailed completion display with file information"""
    print(f"\n🔍 Completions for '{substitution}' ({len(matches)} matches):")
    
    # Sort matches: directories first, then files
    dirs = [m for m in matches if m.endswith('/')]
    files = [m for m in matches if not m.endswith('/')]
    sorted_matches = dirs + files
    
    # Display with details
    for i, match in enumerate(sorted_matches[:10]):  # Show first 10
        if match.endswith('/'):
            icon = "📁"
            details = "directory"
        else:
            icon = "📄"
            try:
                # Get file size and modification time
                stats = os.stat(match)
                size = stats.st_size
                mtime = stats.st_mtime
                
                # Format size
                if size < 1024:
                    size_str = f"{size}B"
                elif size < 1024 * 1024:
                    size_str = f"{size // 1024}KB"
                else:
                    size_str = f"{size // (1024 * 1024)}MB"
                
                details = f"{size_str}"
                
                # Check if executable
                if os.access(match, os.X_OK):
                    icon = "⚡"
                    details += " (executable)"
                    
            except OSError:
                details = "file"
        
        print(f"  {i+1:2d}. {icon} {match:<{longest_match_length + 2}} {details}")
    
    if len(matches) > 10:
        print(f"     ... and {len(matches) - 10} more matches")
    print()

readline.set_completion_display_matches_hook(detailed_completion_display)

import readline
import atexit
import os

class InteractiveShell:
    def __init__(self):
        self.history_file = os.path.expanduser('~/.myshell_history')
        self.setup_readline()
    
    def setup_readline(self):
        """Complete readline setup with all hooks"""
        # Set all hooks
        readline.set_startup_hook(self.startup_hook)
        readline.set_pre_input_hook(self.pre_input_hook)
        readline.set_completion_display_matches_hook(self.display_hook)
        
        # Configure completion
        readline.set_completer(self.completer)
        readline.parse_and_bind('tab: complete')
        
        # Set up history
        try:
            readline.read_history_file(self.history_file)
        except FileNotFoundError:
            pass
        
        atexit.register(self.cleanup)
    
    def startup_hook(self):
        """Initialization at startup"""
        print("🚀 Interactive shell ready!")
        readline.set_history_length(1000)
    
    def pre_input_hook(self):
        """Pre-input setup"""
        # Could insert context-aware prefixes here
        pass
    
    def display_hook(self, substitution, matches, longest_match_length):
        """Custom completion display"""
        if len(matches) > 1:
            print(f"\n💡 {len(matches)} options for '{substitution}':")
            for i, match in enumerate(matches[:5]):
                print(f"  {i+1}. {match}")
            if len(matches) > 5:
                print(f"  ... and {len(matches) - 5} more")
            print()
    
    def completer(self, text, state):
        """Simple file completion"""
        import glob
        matches = glob.glob(text + '*')
        return matches[state] if state < len(matches) else None
    
    def cleanup(self):
        """Cleanup when exiting"""
        readline.write_history_file(self.history_file)

# Set up interactive shell
shell = InteractiveShell()