SimpleGrep 🕵️‍♂️📄

A simple command-line text search tool in Rust, inspired by grep.
Supports both case-sensitive and case-insensitive search.

🚀 Getting Started

Clone the repository and run with cargo:

cargo run -- <query> <input_file> > <output_file>

Example

cargo run -- Rust input.txt > output.txt

This will search for the word Rust in input.txt with case-sensitive matching and writes the result to output.txt file if there is no any error. Otherwise, it prints out the error message in standard error console

🔍 Case Insensitive Search

To perform a case-insensitive search, set the environment variable IGNORE_CASE to 1:

IGNORE_CASE=1 cargo run -- Rust input.txt > output.txt

🧪 Running Tests

The app comes with a built-in test suite. Run all tests using:

cargo test

🛠 Project Structure

• main.rs: Entry point that parses CLI arguments and calls the search logic.
• lib.rs: Contains the Config struct and the run, search, and search_case_insensitive functions.
• tests/lib_test.rs: Unit tests for both case-sensitive and case-insensitive search.