from ZombieChickenMan and billy

billy.sh

#!/bin/bash

# A place to store build information
DIR=~/.purpur/
FILE=$DIR"build"

# Get the latest version from pl3x api
echo "Checking for latest version ..."
VERSION=`curl -sN 'https://api.pl3x.net/v2/purpur/' | jq -r '.versions[0]'`
echo "Latest version is $VERSION"


# Get the latest build for that version from pl3x api
echo "Checking for latest build ..."
BUILD=`curl -sN "https://api.pl3x.net/v2/purpur/$VERSION/" | jq -r '.builds.latest'`
echo "Latest build is $BUILD"


# Check stored build information
echo "Checking previous build ..."

# Create the dir/file where we store build info if it doesnt exist
if [ ! -f $FILE ]; then
  mkdir -p $DIR
  touch $FILE
fi

# Get the stored build information 
PREVIOUS=`cat $FILE`
DOWNLOAD=true 

# Check if their was a previous build stored
if [ -z "$PREVIOUS" ]; then
  echo "No previous builds detected"
else
  echo "Previous build is $PREVIOUS"

  # Compare previous build to current build
  if [ $BUILD == $PREVIOUS ]; then
    # They are the same build, do not download
    DOWNLOAD=false
    echo "Not downloading the same build again"
  fi
fi

# Download the latest build now
if $DOWNLOAD; then
  echo "Downloading build $BUILD $DOWNLOAD"
  # Store the current build information
  echo $BUILD > $FILE
  # Use wget with -O to specify our own filename
  wget https://api.pl3x.net/v2/purpur/$VERSION/$BUILD/download/ -O puprur.jar
fi

newest-paper.sh

export VER="$(curl https://papermc.io/api/v2/projects/paper | jq -r '.versions[-1]')"
export LATEST_BUILD="$(curl -s https://papermc.io/api/v2/projects/paper/versions/$VER | jq -r '.builds[-1]')"
if [ "$LATEST_BUILD" != "$(cat last_update)" ]
then
        export LATEST_NAME="$(curl https://papermc.io/api/v2/projects/paper/versions/$VER/builds/$LATEST_BUILD | jq -r .downloads.applications.name")
        curl "https://papermc.io/api/v2/projects/paper/versions/$VER/builds/$LATEST_BUILD/downloads/$LATEST_NAME" -o paperclip.jar
        echo "$LATEST_BUILD" > last_update
fi

newest-purpur.sh

export VER="$(curl -s https://api.pl3x.net/v2/purpur/ | jq -r '.versions[0]')"
export LATEST_BUILD="$(curl -s https://api.pl3x.net/v2/purpur/versions/$VER | jq -r '.builds[-1]')"
if [ "$LATEST_BUILD" != "$(cat last_update)" ]
then
        curl https://api.pl3x.net/v2/purpur/1.17.1/latest/download -o purpurclip.jar
        echo "$LATEST_BUILD" > last_update
fi