Cargo Perspective

A visual TreeMap analyzer for Rust dependency usage

Inspired by GrandPerspective, Cargo Perspective helps you understand which dependencies your Rust project uses most by visualizing them in an interactive TreeMap.

Overview

Cargo Perspective analyzes your Rust project's dependencies and visualizes how often each crate is called throughout your codebase. Unlike traditional dependency trees, it shows you actual usage patterns, not just the dependency graph.

Each rectangle in the TreeMap represents a crate, sized proportionally to how many times it's called in your code. This helps you:

• Identify which dependencies are actually used (vs. just declared)
• Spot over-reliance on specific crates
• Find opportunities to optimize or reduce dependencies
• Understand your project's true dependency footprint

Key Features

MVP (v0.1) - ✅ Complete

• AST-based call analysis: Scans Rust source files to count function, method, and macro calls to dependencies
• Interactive TreeMap visualization: Built with Dioxus, showing crates as rectangles sized by call count
• Hover tooltips: Display crate name, call count, and dependency type (direct/transitive)
• Zoom functionality: Click on a crate to zoom into its methods (future enhancement)
• CLI and GUI modes:
  • --gui: Launch interactive TreeMap (default)
  • --text: Legacy text-based report mode (from deppy.sh)

Planned Features

• v0.2: Color coding by execution time (green = fast, red = slow), transitive dep filtering
• v0.3: AI-assisted call pattern analysis, feature-level breakdowns
• v1.0: Export to PNG/SVG, persistent caching, workspace support

Architecture

cargo-perspective/
├── src/
│   ├── analysis.rs      # AST-based call counting using syn
│   ├── treemap.rs       # Squarified TreeMap layout algorithm
│   ├── types.rs         # Core data structures (ProjectAnalysis, TreeMapNode, etc.)
│   ├── ui.rs            # Dioxus desktop UI
│   └── main.rs          # CLI entry point
└── Cargo.toml

Quick Start

# Clone the repository
git clone https://github.com/cryptopatrick/cargo-perspective
cd cargo-perspective

# Build the project
cargo build --release

# Run on your Rust project
cargo-perspective --gui

# Or use text mode for quick stats
cargo-perspective --text

Options

--skip-build     Skip the initial cargo build step
--gui            Launch interactive TreeMap visualization (default)
--text           Show text-based analysis report

How It Works

1. Metadata Collection: Uses cargo metadata to build the dependency graph
2. AST Analysis: Parses all .rs files with syn to detect calls like:
   • Function calls: tokio::spawn(...)
   • Method calls: stream.read_to_end()
   • Macros: println!, tokio::select!
3. TreeMap Layout: Applies squarified TreeMap algorithm for optimal rectangle aspect ratios
4. Visualization: Renders with Dioxus in a native desktop window

Examples

# Analyze this project itself
cd cargo-perspective
cargo run --bin cargo-perspective -- --skip-build --gui

# Output:
# Analyzing project dependencies...
# Found 3 crates with 3 total calls
# Launching GUI...
#
# [TreeMap shows: cargo_metadata (50%), anyhow (16.7%), regex (16.7%), etc.]

The original bash script (_dev/deppy.sh) is now available as --text mode for quick terminal-based analysis.

Contributing

Contributions are welcome! Please see our contributing guidelines for details on:

• Code style and testing requirements
• Submitting bug reports and feature requests
• Development setup and workflow

License

This project is licensed under MIT. See LICENSE for details.