A Gradle wrapper-like ktlint wrapper

ktlint

#!/bin/bash
ktlint_version="0.40.0"

########################################################################
# A wrapper for ktlint which automatically downloads and runs ktlint.
# ktlint executables will be installed under `build/ktlint`.
#
# Usage
#
# Download and run ktlint, passing arguments:
#
#  ./ktlint -F --color
#
# Update this file to the latest release:
#
#  ./ktlint --update
#
########################################################################

if [[ "$*" == *--update* ]]; then
  echo "Current ktlint version: $ktlint_version"
  ktlint_version=$(curl --silent https://api.github.com/repos/pinterest/ktlint/releases/latest | grep '"tag_name":' | cut -d'"' -f4)
  echo "Latest ktlint version: $ktlint_version"

  # Update ktlint_version in this file on line 2
  sed -e "2s/ktlint_version=\".*\"/ktlint_version=\"$ktlint_version\"/" ktlint > build/ktlint/ktlint.tmp
  chmod +x build/ktlint/ktlint.tmp
  mv build/ktlint/ktlint.tmp ktlint
fi

folder="build/ktlint/$ktlint_version"
current_sha256=$(cat $folder/ktlint 2> /dev/null | openssl dgst -sha256 | sed 's/^.* //')
ktlint_sha256="$(cat $folder/ktlint.sha 2> /dev/null )"

if [ "$current_sha256" != "$ktlint_sha256" ]; then
  echo "Downloading ktlint $ktlint_version..."
  mkdir -p $folder
  curl -L -o $folder/ktlint.dl https://github.com/pinterest/ktlint/releases/download/"$ktlint_version"/ktlint
  chmod a+x $folder/ktlint.dl
  mv $folder/ktlint.dl $folder/ktlint
  echo $(cat $folder/ktlint | openssl dgst -sha256 | sed 's/^.* //') > $folder/ktlint.sha
fi

if [[ "$*" != *--update* ]]; then
  $folder/ktlint "$@"
fi