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Add level-based color output #3

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Add level-based color output #3

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416410f
add level-based color output
bcicen Nov 12, 2017
263a715
use common line prefix function
bcicen Nov 12, 2017
fbd1488
add color section to README
bcicen Dec 11, 2017
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3 changes: 3 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,9 @@ You can control the logging level while calling a script by setting the `LOGGER_

You can set `LOGGER_LVL=none` to disable all logging.

## Color
By default, log output is colorized by level. This behavior can be disabled by setting `LOGGER_COLOR=0`

## Timestamp customisation

Underneath, the `date` command is used to display the timestamp. Simply set the `LOGGER_FMT` to any valid format supported by `date`.
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35 changes: 26 additions & 9 deletions tinylogger.bash
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Expand Up @@ -24,15 +24,32 @@
# Author: Nagarjuna Kumarappan <[email protected]>

# defaults
LOGGER_FMT=${LOGGER_FMT:="%Y-%m-%d %H:%M:%S"}
LOGGER_LVL=${LOGGER_LVL:="info"}
LOGGER_FMT=${LOGGER_FMT:="%Y-%m-%d %H:%M:%S"}
LOGGER_COLOR=${LOGGER_COLOR:="1"}

_tlog_levels=(error warn info debug)
_tlog_colors=('\033[0;31m' '\033[0;33m' '\033[0;32m' '\033[0;36m')

function _tlog_head {
idx=$1
nc='\033[0m'
lvlname=${_tlog_levels[$idx]^^}

if (("$LOGGER_COLOR")); then
printf "$(date "+${LOGGER_FMT}") - ${_tlog_colors[$idx]}${lvlname}${nc}"
else
printf "$(date "+${LOGGER_FMT}") - ${lvlname}"
fi
}

function tlog {
action=$1 && shift
case $action in
debug) [[ $LOGGER_LVL =~ debug ]] && echo "$( date "+${LOGGER_FMT}" ) - DEBUG - $@" 1>&2 ;;
info) [[ $LOGGER_LVL =~ debug|info ]] && echo "$( date "+${LOGGER_FMT}" ) - INFO - $@" 1>&2 ;;
warn) [[ $LOGGER_LVL =~ debug|info|warn ]] && echo "$( date "+${LOGGER_FMT}" ) - WARN - $@" 1>&2 ;;
error) [[ ! $LOGGER_LVL =~ none ]] && echo "$( date "+${LOGGER_FMT}" ) - ERROR - $@" 1>&2 ;;
esac
true; }
action=$1 && shift
case $action in
debug) [[ $LOGGER_LVL =~ debug ]] && echo "$(_tlog_head 3) - $@" 1>&2 ;;
info) [[ $LOGGER_LVL =~ debug|info ]] && echo "$(_tlog_head 2) - $@" 1>&2 ;;
warn) [[ $LOGGER_LVL =~ debug|info|warn ]] && echo "$(_tlog_head 1) - $@" 1>&2 ;;
error) [[ ! $LOGGER_LVL =~ none ]] && echo "$(_tlog_head 0) - $@" 1>&2 ;;
esac
true;
}