Pre-commit swiftlint hook

swiftlint-pre-commit

#!/bin/bash

if test -d "/opt/homebrew/bin/"; then
  PATH="/opt/homebrew/bin/:${PATH}"
fi
export PATH

SWIFT_LINT=swiftlint

if which swiftlint >/dev/null; then
    # Export files in SCRIPT_INPUT_FILE_$count to lint against later
    count=0
    while IFS= read -r file_path; do
        export SCRIPT_INPUT_FILE_$count="$file_path"
        count=$((count + 1))
    done < <(git diff --name-only --cached --diff-filter=d | grep ".swift$")
    export SCRIPT_INPUT_FILE_COUNT=$count

    if [ "$count" -eq 0 ]; then
        echo "No files to lint!"
        exit 0
    fi

    echo "Found $count lintable files! Linting now.."
    RESULT=$($SWIFT_LINT --use-script-input-files --strict --config .swiftlint.yml)
    NUMBER_OF_ERRORS=$? # swiftline exit value is number of errors

    if [ $NUMBER_OF_ERRORS -eq 0 ]; then
        printf "\n🎉  Well done. No violation."
    else
        printf "\n❌ SwiftLint Failed with $NUMBER_OF_ERRORS errors:"
        while read -r line; do
            FILEPATH=$(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
                printf "\n  \e[31m$TYPE\e[39m\n"
            else
                printf "\n  \e[33m$TYPE\e[39m\n"
            fi
            printf "    \e[90m$FILEPATH:$L:$C\e[39m\n"
            printf "    $MESSAGE - $DESCRIPTION\n"
        done <<< "$RESULT"
        printf "\n❌ COMMIT ABORTED. Please fix them before pushing your code.\n"
        exit 1
    fi
    exit $RESULT
else
	echo "warning: SwiftLint not installed, install using `brew install swiftlint` or download from https://github.com/realm/SwiftLint"
fi