Feat: Implement Persistent Command History

[Shoury-Rana]

Description

Currently, PromptShell's command history is stored in-memory and is lost when the user exits the session. This is unlike standard shells like bash or zsh, where users can press the up arrow to access commands from previous sessions.

This feature request proposes implementing persistent command history, so that commands are saved to a file on exit and reloaded on startup.

Proposed Solution

The readline library, which is already in use, has built-in support for this functionality. The implementation should:

1. Define a history file path: The history file should be stored in the application's config directory (e.g., ~/.config/PromptShell/history.log on Linux/macOS).
2. Load history on startup: When setup_readline() is called, it should check for the existence of the history file and load it using readline.read_history_file().
3. Save history on exit: Use the atexit module to register readline.write_history_file() to be called automatically when the application terminates. This ensures history is saved even on unexpected exits.
4. Limit history size: It's good practice to set a reasonable limit on the number of commands stored using readline.set_history_length().

Benefits

• Major Usability Improvement: Aligns PromptShell with user expectations for modern shell environments.
• Improved Workflow: Saves users from re-typing complex commands from previous sessions.
• Enhanced Productivity: Allows users to easily recall and reuse their work.

Will you make a PR?

• Yes ✅

[Shoury-Rana]

I know there are similar issues by other people and maybe they are working on it, but its more than a month for all of them and there is no follow-up for any of them. so i think it is fine to get this issue re-assigned.