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minigrep

Built from the minigrep project in The Rust Programming Language. The goal wasn't to ship a grep replacement; it was to internalize idiomatic Rust before reaching for external crates, by building something small enough to hold in your head entirely.
Implements case-sensitive and case-insensitive pattern matching across arbitrary text files. Search mode is controlled via the CASE_INSENSITIVE environment variable, keeping the CLI interface clean and composable with shell scripts.
Error handling uses Result throughout and propagates up the call stack with context. No panics in library code; only at the binary entry point, where the error message is formatted for the user. Library code surfaces errors, binary code decides what to do with them.
Configuration is parsed into a typed Config struct at startup: file path, query string, and search mode are validated before any file I/O happens. Invalid usage surfaces early with a clear message.
Unit tests cover the core search functions directly without filesystem fixtures: fast to run, easy to reason about. A concrete example of the Rust convention of keeping logic in library code and keeping the binary thin.

Tech Stack

RUST