Rustroika

A command-line tool to help Moscow residents decide whether to buy a monthly transport pass or pay per trip with their Troika card.

Features

• Calculates the total cost of individual trips vs. monthly pass
• Accounts for the 50% discount on subsequent trips within 90 minutes
• Provides a clear recommendation on which payment method is more economical
• Beautiful colored output with clear visual presentation
• Handles rounding of discounted prices correctly

Installation

Prerequisites

• Rust toolchain (1.70.0 or later)
• Cargo (comes with Rust)

Building from Source

1. Clone the repository:

git clone https://github.com/Gridness/rustroika.git
cd rustroika

2. Build the project:

cargo build --release

3. The executable will be available in target/release/rustroika

Usage

rustroika --trips-week|-t <trips/week> --monthly-cost|-m <monthly_cost> --ticket-price|-p <ticket_price>

Parameters

• --trips-week or -t: Number of trips you make per week
• --monthly-cost or -m: Cost of the monthly pass in RUB
• --ticket-price or -p: Cost of a single ticket in RUB

Example

rustroika --trips-week 10 --monthly-cost 2900 --ticket-price 63

Or using short flags:

rustroika -t 10 -m 2900 -p 63

This example calculates costs for:

• 10 trips per week
• Monthly pass costing 2900 RUB
• Single ticket costing 63 RUB

Output

The program will display:

• Total number of trips per month
• Monthly pass cost
• Individual trip costs (including discounts)
• Ticket price
• Clear recommendation on which option is cheaper
• Explanation of the discount logic

How It Works

1. Calculates total monthly trips (weekly trips × 4)
2. Applies the 50% discount to subsequent trips within 90 minutes
3. Rounds down discounted prices (e.g., 63 → 31)
4. Compares total individual costs with monthly pass cost
5. Provides a recommendation with the amount saved

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

This project is licensed under the Apache 2.0 License - see the LICENSE file for details.