Struct ReplInterface 

pub struct ReplInterface { /* private fields */ }

REPL (Read-Eval-Print Loop) interface

Provides an interactive command-line interface with:

• Line editing and history
• Persistent command history
• Graceful error handling
• Special commands (exit, quit, help)

Architecture

User input → rustyline → ReplParser → CommandExecutor → Handler
                                            ↓
                                      ExecutionContext

Special Commands

The REPL recognizes these built-in commands:

• exit, quit - Exit the REPL
• help - Show available commands (if registered)

History

Command history is stored in the user’s config directory:

• Linux: ~/.config/<app_name>/history.txt
• macOS: ~/Library/Application Support/<app_name>/history.txt
• Windows: %APPDATA%\<app_name>\history.txt

Implementations

impl ReplInterface

pub fn new( registry: CommandRegistry, context: Box<dyn ExecutionContext>, prompt: String, ) -> Result<Self>

Create a new REPL interface

Arguments

• registry - Command registry with all registered commands
• context - Execution context
• prompt - Prompt prefix (e.g., “myapp” will display as “myapp > “)

Errors

Returns an error if rustyline initialization fails (rare).

Example

use dynamic_cli::interface::ReplInterface;
use dynamic_cli::prelude::*;

let registry = CommandRegistry::new();
let context = Box::new(MyContext::default());

let repl = ReplInterface::new(registry, context, "myapp".to_string())?;

pub fn run(self) -> Result<()>

Run the REPL loop

Enters an interactive loop that:

1. Displays the prompt
2. Reads user input
3. Parses and executes the command
4. Displays results or errors
5. Repeats until user exits

Returns

• Ok(()) when user exits normally (via exit or quit)
• Err(_) on critical errors (I/O failures, etc.)

Example

use dynamic_cli::interface::ReplInterface;
use dynamic_cli::prelude::*;

let registry = CommandRegistry::new();
let context = Box::new(MyContext::default());

let repl = ReplInterface::new(registry, context, "myapp".to_string())?;
repl.run()?; // Starts the REPL loop

Trait Implementations

impl Drop for ReplInterface

fn drop(&mut self)

Executes the destructor for this type.