log-color

#!/bin/bash -eu
#
# Color log4j-style logs for easier visual parsing.
#
# Usage:
#   tail foo.log | log-color
#   run-service | log-color

black="`   tput setaf 0; tput bold`"
red="`     tput setaf 1; tput bold`"
green="`   tput setaf 2; tput bold`"
yellow="`  tput setaf 3; tput bold`"
blue="`    tput setaf 4; tput bold`"
magenta="` tput setaf 5; tput bold`"
cyan="`    tput setaf 6; tput bold`"
white="`   tput setaf 7; tput bold`"
#off="`     tput sgr0`"
off="`     echo -ne "\x0f"`" # (Works better on both osx and linux...)

exec sed -r "

  # Timestamps
  s/^\[[0-9]{4}[^]]*\]/$black\\0$off/
  s/^[0-9]{4}-[0-9:,/ -]*/$black\\0$off/

  # Log levels
  s/\\b(FATAL|CRITICAL)\\b/$magenta\\0$off/g
  s/\\bERROR\\b/$red\\0$off/g
  s/\\bWARN(ING)?\\b/$yellow\\0$off/g
  s/\\bINFO\\b/$green\\0$off/g
  s/\\bDEBUG\\b/$blue\\0$off/g
  s/\\bTRACE\\b/$cyan\\0$off/g

  # Grouped things
  s/ \[[^]]+\] \S+ - /$black\\0$off/
  s/ \([a-zA-Z_][a-zA-Z0-9_$.:]*\)$/$black\\0$off/
"