SwiftLint - That run only on modified (new, changes, cached, staged) files

format.sh

#!/bin/bash
#
# Run SwiftLint

START_DATE=$(date +"%s")

SWIFT_LINT=/usr/local/bin/swiftlint
SWIFT_FORMAT=/usr/local/bin/swiftformat

if [[ -e "${SWIFT_LINT}" ]]; then
    echo "[I] Found SwiftLint at ${SWIFT_LINT}"
else
    echo "[!] Local SwiftLint not found at ${SWIFT_LINT}"
    export SWIFT_LINT=${PWD}/Pods/SwiftLint/swiftlint
    echo "[I] Try to using SwiftLint from cocoapods at ${SWIFT_LINT}"
fi

if [[ -e "${SWIFT_FORMAT}" ]]; then
    echo "[I] Found SwiftFormat at ${SWIFT_FORMAT}"
else
    echo "[!] Local SwiftFormat not found at ${SWIFT_FORMAT}"
    export SWIFT_FORMAT=${PWD}/Pods/SwiftFormat/CommandLineTool/swiftformat
    echo "[I] Try to using SwiftFormat from cocoapods at ${SWIFT_FORMAT}"
fi

if [[ ! -e "${SWIFT_LINT}" ]]; then
    echo "[!] SwifLint is not installed."
    echo "[!] Expected location is '${SWIFT_LINT}'"
    echo "[!] Please install it. eg. 'brew install swiftlint'"
    echo "[!] Or using via Cocoapods by 'pod 'SwiftLint'' in your Podfile"
    exit 1
fi

echo "[I] SwiftLint version: $(${SWIFT_LINT} version)"

if [[ ! -e "${SWIFT_FORMAT}" ]]; then
    echo "[!] SwiftFormat is not installed."
    echo "[!] Expected location is '${SWIFT_LINT}'"
    echo "[!] Please install it. eg. 'brew install swiftformat'"
    echo "[!] Or using via Cocoapods by 'pod 'SwiftFormat/CLI'' in your Podfile"
    exit 1
fi

echo "[I] SwiftFormat version: $(${SWIFT_FORMAT} --version)"

# Run for unstaged, staged, new files, excluded for deleted files
git diff --diff-filter=d --name-only -- "*.swift" | while read filename; do
    $SWIFT_FORMAT "$filename"
    $SWIFT_LINT lint --path "$filename";
done

git diff --cached --diff-filter=d --name-only -- "*.swift" | while read filename; do
    $SWIFT_FORMAT "$filename"
    $SWIFT_LINT lint --path "$filename";
done

git ls-files --others --exclude-standard -- "*.swift" | while read filename; do
    $SWIFT_FORMAT "$filename"
    $SWIFT_LINT lint --path "$filename";
done

END_DATE=$(date +"%s")

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

SwiftFormat is better is many ways.

Create .swiftformat file in your root with config below

--swiftversion 5.0

--header strip

--indent 2

--maxwidth 120

--wraparguments before-first
--wrapcollections before-first

--exclude bin,Carthage,Frameworks,Generated,Pods

Other solution! https://gist.github.com/teameh/effb59ba42c101752e3a59c25a85d941