use swiftlint to lint only modified or stagged files

git-lint

#! /bin/bash

# Usage:
# Place this file somewhere in your PATH (and make sure it is executable) then call it like `git lint`

# Check swiftlint
command -v swiftlint >/dev/null 2>&1 || { echo >&2 "git-lint requires swiftlint but it's not installed.  Aborting."; exit 1; }

# Create a temp file
temp_file=$(mktemp)

# Gather all modified and stagged files
git ls-files -m  | grep ".swift" > ${temp_file}
git diff --name-only --cached  | grep ".swift" >> ${temp_file}

# Make list of unique and sorterd files
counter=0
for f in `sort ${temp_file} | uniq`
do
    export SCRIPT_INPUT_FILE_${counter}=${f}
    counter=`expr $counter + 1`
done

# Lint
if (( counter > 0 )); then
    export SCRIPT_INPUT_FILE_COUNT=${counter}
    swiftlint autocorrect --use-script-input-files
fi