Code Quality Guidelines

This skill defines code quality standards for the Jarvy CLI project.

Build and Validation Commands

Run these before every commit:

cargo fmt --all                                # Format code
cargo clippy --all-features -- -D warnings     # Lint (must pass)
cargo check --verbose                          # Type check
cargo test --verbose -- --show-output          # Run tests

Rust Style Guidelines

Edition and Idioms

• Use Rust 2024 edition idioms
• Prefer stdlib over new crates
• Use derive macros (clap, serde, thiserror)

Naming Conventions

// Functions and variables: snake_case
fn install_package(package_name: &str) -> Result<(), InstallError>

// Types and traits: PascalCase
struct ToolConfig { }
enum InstallError { }

// Constants: SCREAMING_SNAKE_CASE
const MAX_RETRY_ATTEMPTS: u32 = 3;

// Modules: snake_case
mod package_manager;

Platform-Specific Code

#[cfg(target_os = "macos")]
fn install_macos() -> Result<(), InstallError> { }

#[cfg(target_os = "linux")]
fn install_linux() -> Result<(), InstallError> { }

#[cfg(target_os = "windows")]
fn install_windows() -> Result<(), InstallError> { }

Lazy Statics

Use

OnceLock

for lazy initialization:

use std::sync::OnceLock;
use std::sync::RwLock;

static REGISTRY: OnceLock<RwLock<HashMap<String, HandlerFn>>> = OnceLock::new();

fn get_registry() -> &'static RwLock<HashMap<String, HandlerFn>> {
    REGISTRY.get_or_init(|| RwLock::new(HashMap::new()))
}

Clippy Compliance

Code must pass

cargo clippy --all-features -- -D warnings

.

Common Fixes

// Use if-let for single pattern
if let Ok(v) = result {
    process(v);
}

// Use ? operator
let value = operation()?;

// Use is_empty()
if items.is_empty() { }

// Avoid needless borrows
function(&string)  // not &string.clone()

Error Handling

thiserror Pattern

#[derive(thiserror::Error, Debug)]
pub enum InstallError {
    #[error("unsupported platform")]
    Unsupported,

    #[error("prerequisite missing: {0}")]
    Prereq(&'static str),

    #[error("command failed: {cmd} (code: {code:?})\n{stderr}")]
    CommandFailed { cmd: String, code: Option<i32>, stderr: String },

    #[error(transparent)]
    Io(#[from] std::io::Error),
}

Error Propagation

pub fn ensure(min_hint: &str) -> Result<(), InstallError> {
    let config = load_config()?;
    if !is_installed(&config)? {
        install()?;
    }
    Ok(())
}

Exit Codes

pub const SUCCESS: i32 = 0;
pub const CONFIG_ERROR: i32 = 2;
pub const PREREQ_MISSING: i32 = 3;
pub const PERMISSION_REQUIRED: i32 = 5;

Testing Standards

Unit Tests

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_parse_version() {
        let result = parse_version("2.40");
        assert!(result.is_ok());
    }
}

Test Environment Variables

• JARVY_TEST_MODE=1

  - Disable interactive prompts

• JARVY_FAST_TEST

  - Skip external commands

Documentation Standards

Module Documentation

//! Tool registry for managing package installer handlers.
//!
//! This module provides a global registry that maps tool names
//! to their installation handler functions.

Function Documentation

/// Ensures a tool is installed at the specified minimum version.
///
/// # Arguments
///
/// * `min_hint` - Minimum version string (e.g., "2.40")
///
/// # Returns
///
/// Returns `Ok(())` if installed or successfully installed.
pub fn ensure(min_hint: &str) -> Result<(), InstallError> { }

Commit Message Format

Use Conventional Commits:

<type>(<scope>): <description>

[optional body]

Types

• feat:

  - New feature

• fix:

  - Bug fix

• docs:

  - Documentation

• chore:

  - Maintenance

• refactor:

  - Code restructuring

• test:

  - Tests

Examples

feat(tools): add Node.js version manager support

fix(config): handle missing jarvy.toml gracefully

docs: update README with installation instructions

chore(deps): update clap to 4.5

refactor(registry): simplify handler lookup

test(cli): add integration tests for setup

Scope Guidelines

• tools

  - Tool implementations

• config

  - Configuration parsing

• cli

  - Command-line interface

• registry

  - Tool registry

• telemetry

  - Analytics

• deps

  - Dependencies

Pre-Commit Checklist

1. cargo fmt --all

   - formatted

2. cargo clippy --all-features -- -D warnings

   - no warnings

3. cargo check --verbose

   - compiles

4. cargo test --verbose -- --show-output

   - tests pass
5. Commit message follows Conventional Commits
6. New public APIs documented
7. Platform-specific code uses

   #[cfg]