Auto Extension Switcher (Rust)

Note

The current code in this repository is AI-generated and not the original/real code.
As the developer, I plan to remove this placeholder code and replace it with the real implementation soon.

Project Overview

Auto Extension Switcher is a small Rust tool that automatically renames newly created files in a folder based on the user-selected file format.
This project helps practice Rust skills including filesystem monitoring, user input, error handling, and colored terminal output.

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MVP Features

• Watch a folder for new file creations.
• Prompt the user to choose the desired file format (Rust, Python, HTML, JavaScript, C++).
• Automatically rename the file with the selected extension.
• Use colored output for better UX.

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Flow

1. User runs the program:

   autoext ./watched

2. Create a new file in ./watched folder.

3. The program detects the file creation.

4. Prompts the user:

   Which format do you want? (Rust, Python, HTML, JS, C++)
   

5. User selects a format.

6. File is renamed automatically with the chosen extension.

7. MVP exits after processing the first file.

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Suggested Crates

• notify → Watch a folder for new files.
• dialoguer → Nice CLI prompts for user input.
• anyhow → Simplified error handling.
• colored → Colored terminal output.

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Rust Project Setup

Cargo.toml

[package]
name = "autoext"
version = "0.1.0"
edition = "2021"

[dependencies]
dialoguer = "0.11.0"
notify = "8.2.0"
anyhow = "1.0.99"
colored = "3.0.0"

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Usage Instructions

1. Build the project:

   cargo build --release

2. Run the program:

   ./target/release/autoext ./watched

3. Create a new file in the folder you are watching:

   touch ./watched/new_file

4. Follow the terminal prompt to select the file format.

5. The file will be renamed automatically:

   Renamed to: new_file.rs
   

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Future Enhancements

• Continuous background monitoring (not exit after one file).
• Configurable custom extension mapping.
• File templates for each language.
• Multi-file batch handling.
• Cross-platform packaging for Windows, macOS, Linux.

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MVP Success Criteria

• Detects a new file in the watched folder.
• Prompts user for file format.
• Renames file correctly.
• Works with colorized terminal output.
• Handles errors gracefully.

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