Script to update bat from the github release page for debian derivatives.

update_bat.sh

#!/usr/bin/env bash

if ! which curl > /dev/null; then
    echo "You need to install curl"
    exit 1
fi

if ! which jq > /dev/null; then
    echo "You need to install jq"
    exit 1
fi

download_and_install() {
  curl -LJO ${DL_LINK}
  dpkg -i *.deb
}

compare_versions() {
  local major1=$(echo ${1}|awk -F"." '{print $1}')
  local minor1=$(echo ${1}|awk -F"." '{print $2}')
  local micro1=$(echo ${1}|awk -F"." '{print $3}')
  local major2=$(echo ${2}|awk -F"." '{print $1}')
  local minor2=$(echo ${2}|awk -F"." '{print $2}')
  local micro2=$(echo ${2}|awk -F"." '{print $3}')

  if [ ${major1} -gt ${major2} ]; then
    return 0
  elif [ ${major1} -eq ${major2} ] && [ ${minor1} -gt ${minor2} ]; then
    return 0
  elif [ ${major1} -eq ${major2} ] && [ ${minor1} -eq ${minor2} ] && [ ${micro1} -gt ${micro2} ] ; then
    return 0
  fi
  return 1
}

CURRENT_VERSION=0.0.0
if which bat > /dev/null; then
  CURRENT_VERSION=$(apt-cache show bat|grep Version|awk '{print $2}')
fi

echo "-> Current version: ${CURRENT_VERSION}"

ASSETS=$(curl -H "Accept: application/vnd.github.v3+json" https://api.github.com/repos/sharkdp/bat/releases 2>/dev/null)
DL_VERSION=$(echo $ASSETS|jq '.[0].tag_name'|sed -e 's/v//'|sed -e 's/"//g')
DL_LINK=$(echo ${ASSETS}|jq '.[0].assets[] | select(.name | contains("_amd64.deb")) | .browser_download_url'|grep -v musl|sed -e 's/"//g')

echo "-> Latest version found: ${DL_VERSION}"

if compare_versions ${DL_VERSION} ${CURRENT_VERSION}; then
  TMPDIR=$(mktemp -d)
  CURDIR=$PWD
  cd ${TMPDIR}
  download_and_install || true
  cd ${PWD}
  rm -rf ${TMPDIR}
fi