Runs Swiftlint only for changed files - Xcode run script

RunSwiftlintOnlyForChangedFiles.sh

# Created by: Rostyslav Druzhchenko
#

# Get current time
#
START_DATE=$(date +"%s")

# Save Swiftlint full path to a local variable
#
SWIFT_LINT=/usr/local/bin/swiftlint

# Function
#
# Runs SwiftLint for given filename
run_swiftlint() {
    local FILE_NAME="${1}"
    if [[ "${FILE_NAME##*.}" == "swift" ]]; then
        ${SWIFT_LINT} autocorrect --path "${FILE_NAME}" # Run autocorrect
        ${SWIFT_LINT} lint --path "${FILE_NAME}" # Run lint
    fi
}

# Check if Swiftlint is insatlled on the systesm where the script runs
# (it can be a local machine and it can also be remote build host)
#
if [[ -e "${SWIFT_LINT}" ]]; then
    echo "SwiftLint version: $(${SWIFT_LINT} version)"
    # Obtain full path to the file
    FULL_PATH=$"$(git rev-parse --show-toplevel)"
    # Run for both staged and unstaged files
    git diff --name-only | while read FILE_NAME; do run_swiftlint "${FULL_PATH}/${FILE_NAME}"; done
    git diff --cached --name-only | while read FILE_NAME; do run_swiftlint "${FULL_PATH}/${FILE_NAME}"; done
else
    echo "${SWIFT_LINT} is not installed."
    exit 0
fi

# Calculate time spent by Swiflint
#
END_DATE=$(date +"%s")

DIFF=$(($END_DATE - $START_DATE))
echo "SwiftLint took $(($DIFF / 60)) minutes and $(($DIFF % 60)) seconds to complete."