#!/bin/bash
for arg in "$@"
do
  case "$arg" in
    --after-cursor=* )
      after="${arg#--after-cursor=}"
      ;;
    --version )
      printf "systemd 300 (300.3-vector99)\n+XYZ -ABC\n"
      exit
  esac
done

lines=(
  '"_SYSTEMD_UNIT":"sysinit.target","MESSAGE":"System Initialization","_SOURCE_REALTIME_TIMESTAMP":"1578529839140001","PRIORITY":"6"'
  '"_SYSTEMD_UNIT":"unit.service","MESSAGE":"unit message","_SOURCE_REALTIME_TIMESTAMP":"1578529839140002","PRIORITY":"7"'
  '"_SYSTEMD_UNIT":"badunit.service","MESSAGE":[194,191,72,101,108,108,111,63],"_SOURCE_REALTIME_TIMESTAMP":"1578529839140003","PRIORITY":"5"'
  '"_SYSTEMD_UNIT":"stdout","MESSAGE":"Missing timestamp","__REALTIME_TIMESTAMP":"1578529839140004","PRIORITY":"2"'
  '"_SYSTEMD_UNIT":"stdout","MESSAGE":"Different timestamps","_SOURCE_REALTIME_TIMESTAMP":"1578529839140005","__REALTIME_TIMESTAMP":"1578529839140004","PRIORITY":"3"'
  '"_SYSTEMD_UNIT":"syslog.service","MESSAGE":"Non-ASCII in other field","_SOURCE_REALTIME_TIMESTAMP":"1578529839140005","__REALTIME_TIMESTAMP":"1578529839140004","PRIORITY":"3","SYSLOG_RAW":[194,191,87,111,114,108,100,63]'
  '"_SYSTEMD_UNIT":"NetworkManager.service","MESSAGE":"<info>  [1608278027.6016] dhcp-init: Using DHCP client 'dhclient'","_SOURCE_REALTIME_TIMESTAMP":"1578529839140005","__REALTIME_TIMESTAMP":"1578529839140004","PRIORITY":"6","SYSLOG_FACILITY":["DHCP4","DHCP6"]'
  '"PRIORITY":"5","SYSLOG_FACILITY":"0","SYSLOG_IDENTIFIER":"kernel","_TRANSPORT":"kernel","__REALTIME_TIMESTAMP":"1578529839140006","MESSAGE":"audit log"'
)

cursor=0
for line in "${lines[@]}"
do
  cursor=$(( $cursor + 1 ))
  if [[ $cursor -gt $after ]]
  then
    echo "{$line,\"__CURSOR\":\"$cursor\"}"
  fi
done

# The real journalctl will wait forever for new data in the journal.
exec sleep 9999