Code Quality with Clippy and rustfmt

Beginner6 minTrending

Enforce code quality and consistent formatting using clippy for linting and rustfmt for automatic code formatting.

Prerequisites

-Rust toolchain installed via rustup

Steps

Run clippy for lint warnings

Analyze your code with clippy to catch common mistakes and unidiomatic patterns.

$ cargo clippy -- -W clippy::pedantic

Use -W clippy::pedantic for stricter checks. Use -D warnings to treat warnings as errors in CI.

Auto-fix clippy suggestions

Apply automatic fixes for issues clippy can resolve.

$ cargo clippy --fix --allow-dirty

Review the changes after auto-fixing. Some fixes may change behavior in subtle ways.

Format code with rustfmt

Apply consistent formatting across the entire project.

$ cargo fmt

Check formatting without modifying files

Verify that all code is properly formatted, failing if changes are needed. Ideal for CI.

$ cargo fmt -- --check

Create a rustfmt configuration

Customize formatting rules with a rustfmt.toml file.

$ cat > rustfmt.toml << 'EOF' max_width = 100 tab_spaces = 4 edition = "2021" use_field_init_shorthand = true EOF

Full Script

full-script.sh

#!/bin/bash
# Rust Code Quality: Clippy + rustfmt
set -euo pipefail

echo "=== Formatting Check ==="
cargo fmt -- --check && echo "Formatting OK" || { echo "Formatting issues found. Run 'cargo fmt' to fix."; }

echo ""
echo "=== Clippy Lint ==="
cargo clippy -- -D warnings 2>&1

echo ""
echo "=== Quality Commands ==="
echo "Lint:        cargo clippy"
echo "Strict:      cargo clippy -- -W clippy::pedantic"
echo "CI mode:     cargo clippy -- -D warnings"
echo "Auto-fix:    cargo clippy --fix --allow-dirty"
echo "Format:      cargo fmt"
echo "Format check: cargo fmt -- --check"

FAQ

Discussion

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#!/bin/bash # Rust Code Quality: Clippy + rustfmt set -euo pipefail echo "=== Formatting Check ===" cargo fmt -- --check && echo "Formatting OK" || { echo "Formatting issues found. Run 'cargo fmt' to fix."; } echo "" echo "=== Clippy Lint ===" cargo clippy -- -D warnings 2>&1 echo "" echo "=== Quality Commands ===" echo "Lint: cargo clippy" echo "Strict: cargo clippy -- -W clippy::pedantic" echo "CI mode: cargo clippy -- -D warnings" echo "Auto-fix: cargo clippy --fix --allow-dirty" echo "Format: cargo fmt" echo "Format check: cargo fmt -- --check"