philomena/.githooks/pre-commit

#!/usr/bin/env bash
#
# Pre-commit hook to run lightweight checks and auto-format the code. It's designed
# to be blazingly fast, so it checks only changed files.
#
# You can install this hook and some of its dependencies by running `scripts/init.sh`.

set -euo pipefail

# Using `readlink` because the pre-commit hook is installed via a symlink, so
# we need to resolve it before we can make path relative to this script's file.
. "$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")/../scripts/lib.sh"

function command_exists() {
  bin_name=$(basename "$1")

  if command -v "$1" &> /dev/null; then
    return 0
  fi

  warn "$bin_name CLI was not found. Ignoring it..."
  return 1
}

files=$(git diff --cached --name-only --diff-filter=ACMR | sed 's| |\\ |g')

if [[ -z "$files" ]]; then
  info "No files changed. Exiting the pre-commit hook..."
  exit 0
fi

if command_exists typos; then
  echo "$files" | step xargs typos
fi

if command_exists npx; then
  echo "$files" | step xargs npx prettier --ignore-unknown --write
fi

if command_exists cargo; then
  # `rustfmt` doesn't ignore non-rust files automatically
  rust_files=$(echo "$files" | { grep -E '\.rs$' || true; })

  if [[ -n "$rust_files" ]]; then
    echo "$rust_files" | step xargs cargo fmt --manifest-path native/Cargo.toml --
  fi
fi

if command_exists mix; then
  echo "$files" | step xargs mix format
fi

# Add the modified/prettified files to staging
echo "$files" | step xargs git add