#!/bin/sh
# File: newer-in-debian.sh
# Location: /mnt/public/Support/Programs/repology.org/
# Author: bgstack15
# Startdate: 2023-12-28-5 17:42
# SPDX-License-Identifier: GPL-3.0-only
# Title: Newer in Debian script
# Purpose: List newer packages in debian than devuan that I maintain
# History:
# Usage: ./newer-in-debian.sh
# Reference:
#    https://stackoverflow.com/questions/5947742/how-to-change-the-output-color-of-echo-in-linux
#    https://repology.org/projects/?maintainer=bgstack15@gmail.com&inrepo=devuan_unstable&newest=1
# Improve:
# Dependencies:
#    req-devuan: jq, curl, devscripts
#    req-raw: jq, curl, rmadison
# Documentation: read repology

# CONFIG
test -z "${CACHE_DIR}" && CACHE_DIR="${XDG_CACHE_DIR:-${HOME}/.cache}"
test -z "${CACHE_FILE}" && CACHE_FILE="${CACHE_DIR}/newer-in-debian.cache"
test -z "${EMAIL}" && EMAIL=bgstack15@gmail.com
test -z "${RMADISON_URL_MAP_DEVUAN}" && export RMADISON_URL_MAP_DEVUAN=https://api.pkginfo.devuan.org/madison
BAD_COLOR='\033[0;31m' # red
GOOD_COLOR='\033[0;32m' # green
NEUTRAL='\033[0m' # no color

# CACHE OPERATIONS
# invalidate cache older than 23 hours
_cache_is_too_old="$( find "${CACHE_FILE}" -maxdepth 0 -mmin +$(( 60 * 23 )) -print -quit 2>/dev/null )"
test -n "${_cache_is_too_old}" && rm "${CACHE_FILE:-NOTHINGTODEL}"
test -n "${CLEAR_CACHE}" && rm "${CACHE_FILE:-NOTHINGTODEL}"

# test and rebuild cache if necessary
_cache_contents="$( cat "${CACHE_FILE}" 2>/dev/null )"
test -z "${_cache_contents}" && {
   curl --silent --header 'User-Agent: bgstack15-cli' "https://repology.org/api/v1/projects/?maintainer=${EMAIL}&inrepo=devuan_unstable" > "${CACHE_FILE}"
   _cache_contents="$( cat "${CACHE_FILE}" 2>/dev/null )"
} || {
   printf '%s\n' "Using cached package list." 1>&2
}

# if cache is still empty, then something broke with curl statement.
test -z "${_cache_contents}" && {
   printf '%s\n' "Fatal! Cache is still empty. Re-run with debugging. Aborted." 1>&2
   exit 1
}

# FUNCTIONS
_check_status() {
   package="${1}"
   # this only uses amd64. If I ever change personal architectures that I care about, I would need to update this.
   # The purpose is to avoid the "source" listing, which might not be the same version as a built architecture, due to binary repacks, e.g., lightdm_1.32.0-4+b1 in debian.
   # --source-and-binary converts "freeipa" source into "freeipa-client" amd64, and a few others but since the versions are all the same we just take the first one (head -n1)
   _deb="$( rmadison              --source-and-binary --architecture=amd64 --suite unstable "${package}" | awk -F'|' '{print $2}' | head -n1 | xargs | sed -r -e 's/\+b[1-9]$//;' )" ;
   # only do anything if the package exists in Debian.
   if test -n "${_deb}" ;
   then
      _dev="$( rmadison --url devuan --source-and-binary --architecture=amd64 --suite unstable "${package}" | awk -F'|' '{print $2}' | head -n1 | xargs | sed -r -e 's/\+b[1-9]$//;' )" ;
      _result="${BAD_COLOR}BAD${NEUTRAL}"
      echo "${_dev}" | grep -qE "${_deb}\+?devuan-?[0-9]" && {
         _result="${GOOD_COLOR}good${NEUTRAL}"
      }
      printf '%4b\t%s\t%s\t%s\n' "${_result}" "${package}" "${_deb}" "${_dev}"
   else
      printf '%4s\t%s\t\n' "none" "${package}" 1>&2
   fi
}

# MAIN
_package_list="$( <"${CACHE_FILE}" jq --raw-output 'keys[]' )"
# do not double-quote variable in next line with the for statement.
for package in ${_package_list} ;
do
   if test -n "${PARALLEL}" ;
   then
      _check_status "${package}" &
   else
      _check_status "${package}"
   fi
done
test -n "${PARALLEL}" && {
   wait
}
