minigrep

This repository, minigrep, is a simple command-line tool implemented in Rust that mimics basic functionality of the grep command. It allows you to search for a specified query within a text file, with options for case-sensitive and case-insensitive searches.

Key Features

• File Reading: Reads contents from a specified file, provided through the command line.
• Case Sensitivity Control: Case-sensitive by default; environment variable CASE_INSENSITIVE=1 enables case-insensitive search.
• Configurable Queries: Accepts a search query and filename as command-line arguments.
• Error Handling: Handles missing or invalid arguments and file read errors gracefully using the Result type and Rust’s ? operator.

Code Overview

• run Function: Core function that executes the search logic and displays matching lines.
• Config Struct: Manages command-line arguments, including filename, query, and case sensitivity, with input validation.
• Search Functions:
  • search for case-sensitive search.
  • search_case_insensitive for case-insensitive search by converting both query and contents to lowercase.

Tests

Includes tests for both search modes, ensuring accurate results across case variations. This tool demonstrates core Rust principles like error handling, ownership, and test-driven development (TDD).