lint

#!/bin/bash

# Exit if any commands fail
# This aborts the commit if used as a git hook
set -e

only_scripts() {
	while IFS= read -r line; do
		firstline=$(head -n 1 "$line")
		if [[ "$firstline" == '#!/bin/bash' ]] || [[ "$line" =~ .sh$ ]]; then
			echo "$line"
		fi
	done
}

if [ "$GIT_PRE_COMMIT_HOOK" = true ]; then
	# If we are running as a pre-commit hook, only check the staged files
	# If grep has no results, this will fail. Disable -e temporarily.
	set +e
	STAGED_FILES="$(git diff --name-only --cached | only_scripts)"
	set -e
else
	# Otherwise, check all shell files
	STAGED_FILES="$("$GOPATH/bin/shfmt" -f .)"
fi

if [ -z "$STAGED_FILES" ]; then
	echo 'No files to check.'
	exit 0
fi

# Prettify first in case it affects linting
echo 'Prettifying...'
for file in $STAGED_FILES; do
	# Use shfmt to prettify
	"$GOPATH/bin/shfmt" -l -w -i 0 "$file"
	# Add the fixed files back the the staging area
	# This only happens within the precommit hook, which uses git stash beforehand!
	if [ "$GIT_PRE_COMMIT_HOOK" = 'true' ]; then
		git add "$file"
	fi
done

# Now lint using shellcheck
echo 'Linting...'
for file in $STAGED_FILES; do
	shellcheck "$file"
done