Git Client-side pre-commit hook for SwiftLint

pre-commit-swiftlint.sh

#!/bin/bash
#
# hook script for swiftlint. It will triggered when you make a commit.
#

#TODO: move this content to separate file ('lint'), add separate file for swiftformat ('format'), use them here in pre-commit

GUI=0
LINT_PATH_FOR_GUI="/usr/local/bin/swiftlint"

printColored() {
	if (( $# < 1 )); then
		return 0
	fi

	if (( $GUI )); then
		printf "$1\n"
	else
		printf "\e[$2m$1\e[39m\n"
	fi
}

if (( $GUI )); then
	LINT=$LINT_PATH_FOR_GUI
else
	LINT=$(which swiftlint)
fi

CURRENT_DIR=$(pwd)

if [[ -e "${LINT}" ]]; then
	echo "SwiftLint Start..."
else
	echo "SwiftLint does not exist, download from https://github.com/realm/SwiftLint"
	exit 1
fi

if [[ -e "$(which zsh)" ]]; then
	COMMAND=$(tail -1 ~/.zsh_history | awk -F ":0;" '{print $2}')
elif [[ -e "$(which bash)" ]]; then
	COMMAND=$(tail -1 ~/.bash_history)
fi

SHORT_SWITCHES=$(echo "$COMMAND" | grep -Eio "\s-\w+(\s|$)" | grep "a")
LONG_SWITCHES=$(echo "$COMMAND" | grep -Eio "(--all)")

if [[ $SHORT_SWITCHES == "" && $LONG_SWITCHES == "" ]]; then
	INCLUDE_ALL="NO"
else
	INCLUDE_ALL="YES"
fi

#{ git diff --cached --name-only --diff-filter=d -z -- **/*.swift ; git diff --name-only --diff-filter=d -z -- **/*.swift } | xargs -0 -I{} -n1 swiftlint --quiet --path $CURRENT_DIR/{}

RESULT=$(git diff --cached --name-only --diff-filter=d -z -- "**/*.swift" | xargs -0 -n1 -I{} $LINT --quiet --path $CURRENT_DIR/{})
if (( $GUI )) || [[ $INCLUDE_ALL == "YES" ]]; then
	RESULT+=$(git diff --name-only --diff-filter=d -z -- "**/*.swift" | xargs -0 -n1 -I{} $LINT --quiet --path $CURRENT_DIR/{})
fi

if [[ "$RESULT" == '' ]]; then
	printColored "SwiftLint Finished." 32
else
	echo ""
	printColored "SwiftLint Failed. Please check below:" 31

	while read -r line; do

		FILEPATH=$(echo $line | cut -d : -f 1)
		L=$(echo $line | cut -d : -f 2)
		C=$(echo $line | cut -d : -f 3)
		TYPE=$(echo $line | cut -d : -f 4 | cut -c 2-)
		MESSAGE=$(echo $line | cut -d : -f 5 | cut -c 2-)
		DESCRIPTION=$(echo $line | cut -d : -f 6 | cut -c 2-)
		if [ "$TYPE" == 'error' ]; then
			printColored "\n  $TYPE" 31
		else
			printColored "\n  $TYPE" 33
		fi
		printColored "    $FILEPATH:$L:$C" 90
		printf "    $MESSAGE - $DESCRIPTION\n"
	done <<< "$RESULT"

	printf "\nCOMMIT ABORTED. Please fix them before commiting.\n"

	exit 1
fi

This script swiftlints only files to be committed.

There's one flow: it uses a hardcoded path to .zsh_history to determine wether git commit was invoked with an -a or --all option. There may be a better way to check it.