# logging
msg() { printf "$@\n" >&2 ;}
info()   { msg "** $@" ;}
error()  { msg "!! $@" ;}
die()  { error "$@" ;exit 1;}
exists(){ type "$1" >/dev/null 2>/dev/null; }
is_root(){
  test $(id -u) -eq 0
} 

defer(){
  #close enough
  trapstr="$1;${trapstr:-exit}"
  trap "$trapstr" INT TERM EXIT KILL
}

esudo(){
  # becomes root with sudo powers
  # unless nosudo env is set
  if test "${nosudo-false}" != true && ! is_root; then
    echo "we're going sudo..." >&2
    exec sudo -E "$0" "$@"
    exit 23 # go to hell
  fi
}

get_hostname(){
  # finds the current hostname
  #   if ENV HOSTN is set echo $HOSTN
  #   We try the following:
  #      $HOSTN
  #      $HOSTNAME
  #      hostname
  #      uci system.hostname
  #      /etc/hostname
  #   if everything fails, it returns 1 and prints 'unknown'

  if [ -n "${HOSTN:-}" ] ;     then printf "${HOSTN:-}" 
  elif [ -n "${HOSTNAME:-}" ] ;then printf "$HOSTNAME"
  elif exists hostname ;       then printf "$(hostname)"
  elif exists uci    ;         then printf "$(uci get system.@system[0].hostname)"
  elif [ -e /etc/hostname ]   ;then printf "$(cat /etc/hostname)"
  else                              printf "unknown"; return 1
  fi
  return 0
}

line_to_dot(){ 
  while read line; do printf .; done;
}


get_os()
{
  # TODO: find all the release files
  #if grep -q 'Linux' /etc/*release 2>/dev/null || grep -qe 'Linux' /etc/issue 2>/dev/null; then
  if grep -q 'Linux' /etc/lsb-release 2>/dev/null || grep -q 'Linux' /etc/issue 2>/dev/null; then
    echo 'linux'
  elif exists getprop ; then
    echo 'android'
  elif test -e /etc/openwrt_release; then
    echo 'openwrt'
  elif uname -s | grep -qi 'darwin'; then
    echo 'osx'
  else
    warn "Cannot determine your operating system, falling back to Linux"
    echo 'linux'
  fi
}