qc-cli 0.6.3

qc is designed to give you an instant breakdown of your codebase composition using Mmap and Parallel Directory Walking.
qc-cli-0.6.3 is not a library.

qc (Quick Count) 🚀

A high-performance source code auditor and line counter built in modern Rust.

qc is designed to provide an instant, high-fidelity breakdown of codebase composition. By leveraging Memory Mapping (Mmap) and Parallel Directory Walking, it can scan tens of thousands of files in milliseconds.

Example Output

qc demo

⚡ Benchmarks

In head-to-head comparisons against tokei on the Linux Kernel source tree, qc performed ~1.8x faster over 100 runs.

Tool Mean Time Speedup
qc 568.9 ms 1.81x
tokei 1032 ms 1.00x

✨ Features

  • Modern Rust Core: Built on the Rust 2024 Edition for maximum safety and performance.
  • Hybrid I/O Engine: Automatically switches between standard fs::read and Mmap based on file size to optimize throughput.
  • Deep Heuristics: Identifies files via extensions, filenames, and shebang detection (e.g., #!/bin/bash, #!/usr/bin/env python).
  • Line Composition: Reports physical lines and category hits (Code, Comments, Blank) using a fast, byte-level state machine.
  • Terminal Visuals: Includes a color-coded language composition bar and a code/comment heatmap.
  • Rich Output: Supports human-readable text output or machine-readable JSON for CI/CD integration.
  • Respectful: Powered by the ignore crate to automatically honor .gitignore, .ignore, and hidden file rules.

Counting Semantics

qc reports:

  • physical_lines as the one-true line count (each physical line once).
  • code, comment, and blank as category hits.

A mixed line like let x = 1; // note counts as one physical line and increments both code and comment.

🛠 Installation

From Source

Ensure you have the latest Rust toolchain installed (1.85+ recommended for Edition 2024).

  1. Clone the repository:

    git clone https://github.com/toast1599/qc.git
cd qc

  2. Build and Install:

    cargo install --path .

    Or use the provided Makefile to automate the build process.

🚀 Usage

Run qc in any directory to start an audit:

qc .

Options

  • qc [path] — Scan a specific directory (defaults to .).
  • qc -<number> — Limit the "Top Files" list (e.g., qc -20).
  • qc --json — Output results as a JSON object.
  • qc --json-out <path> — Save JSON results directly to a file.
  • qc --rs --py — Filter results to specific languages (e.g., Rust and Python).
  • qc -- [path-starting-with-dash] — Treat following tokens as paths even if they begin with -.

Unknown flags return an explicit unknown-option error.

Output Notes

  • Text summary reports Physical Lines and category hits.
  • JSON output includes physical_lines in totals, languages, and files.
  • Top N Largest Files is ranked by file size in bytes (stable path tiebreaker).

📊 Performance Philosophy

Unlike traditional counters that rely on heavy AST parsing, qc uses a byte-level scanning heuristic. This avoids the overhead of full UTF-8 validation while maintaining high accuracy for line-type classification, making it ideal for massive monorepos where speed is the primary constraint.

⚖️ License

This project is licensed under GPL-3.0-or-later — see the LICENSE file for details.