logging

#!/bin/bash
# Black        0;30     Dark Gray     1;30
# Blue         0;34     Light Blue    1;34
# Green        0;32     Light Green   1;32
# Cyan         0;36     Light Cyan    1;36
# Red          0;31     Light Red     1;31
# Purple       0;35     Light Purple  1;35
# Brown/Orange 0;33     Yellow        1;33
# Light Gray   0;37     White         1;37

# MAC has different names
if [[ `uname` == "Darwin" ]]; then
  BLUE='\x1B[0;34m'
  LIGHT_GREY='\x1B[0;37m'
  DARK_RED='\x1B[1;31m'
  LIGHT_RED='\x1B[0;31m'
  LIGHT_GREEN='\x1B[0;32m'
  NC='\x1B[0m' # No Color
else
  BLUE='\e[0;34m'
  LIGHT_GREY='\e[0;37m'
  DARK_RED='\e[1;31m'
  LIGHT_RED='\e[0;31m'
  LIGHT_GREEN='\e[0;32m'
  NC='\e[0m' # No Color
fi

exec 3>&2 # logging stream (file descriptor 3) defaults to STDERR

DEBUG_LEVEL=0
INFO_LEVEL=1
WARNING_LEVEL=2
ERROR_LEVEL=3
FATAL_LEVEL=4

error() { log $ERROR_LEVEL "  ${DARK_RED}ERROR${NC}   [${LIGHT_GREEN}$(date +"%Y-%m-%d %H:%M:%S")${NC}] ${DARK_RED}$1${NC}"; }
warn() { log $WARNING_LEVEL "  ${LIGHT_RED}WARNING${NC} [${LIGHT_GREEN}$(date +"%Y-%m-%d %H:%M:%S")${NC}] ${LIGHT_RED}$1${NC}"; }
notify() { log $INFO_LEVEL "  ${BLUE}INFO${NC}    [${LIGHT_GREEN}$(date +"%Y-%m-%d %H:%M:%S")${NC}] $1${NC}"; }
info() { log $INFO_LEVEL "  ${BLUE}INFO${NC}    [${LIGHT_GREEN}$(date +"%Y-%m-%d %H:%M:%S")${NC}] $1${NC}"; }
debug() { log $DEBUG_LEVEL "  ${LIGHT_GREY}DEBUG${NC}   [${LIGHT_GREEN}$(date +"%Y-%m-%d %H:%M:%S")${NC}] ${LIGHT_GREY}$1${NC}"; }

blue() { pp "${BLUE}$1${NC}"; }
grey() { pp "${LIGHT_GREY}$1${NC}"; }
red() { pp "${DARK_RED}$1${NC}"; }
green() { pp "${LIGHT_GREEN}$1${NC}"; }
black() { pp "$1"; }

error_all() { [[ "$1" != "/dev/null" ]] && (tail -n 100 $1 > $1.last ; while read line; do error "$line" ; done < $1.last ;) }
warn_all() { [[ "$1" != "/dev/null" ]] && (tail -n 100 $1 > $1.last ; while read line; do warn "$line" ; done < $1.last ;) }
notify_all() { [[ "$1" != "/dev/null" ]] && (tail -n 100 $1 > $1.last ; while read line; do notify "$line" ; done < $1.last ;) }
debug_all() { [[ "$1" != "/dev/null" ]] && (tail -n 100 $1 > $1.last ; while read line; do debug "$line" ; done < $1.last ;) }

log() {
  LOGLEVEL=${LOGLEVEL-$INFO_LEVEL}
  if [ "$LOGLEVEL" -le "$1" ] && [ ! -z "$2" ]; then
    pp "$2"
  fi
}

pp() {
  if [[ `uname` == "Darwin" ]]; then
    echo -e "$1" >&3
  else
    # Expand escaped characters, wrap at 70 chars, indent wrapped lines
    echo -e "$1" | sed '2~1s/^/  /' >&3
  fi
}

export -f error
export -f warn
export -f notify
export -f debug

export -f error_all
export -f warn_all
export -f notify_all
export -f debug_all

export -f blue
export -f grey
export -f red
export -f green