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Logging library for bash to configure the current script to log to console and a file with timestamp and log level
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| # Reads from stdin and prefixes each line with a timestamp (if true) and default log level (if missing) | |
| prefix_log() { local default_level=$1 | |
| while read -r line; do | |
| local timestamp='' | |
| local level='' | |
| if ! [[ $line =~ ^[0-9]{4}-[0-9]{2}-[0-9]{2} ]]; then | |
| timestamp="$(date +"%Y-%m-%d %T.%3N") - " | |
| if ! [[ $line =~ ^(TRACE|DEBUG|INFO|WARN|ERROR) ]]; then | |
| level="$default_level - " | |
| fi | |
| fi | |
| echo "$timestamp$level$line" | |
| done | |
| } | |
| # Sets up script to prefix every line with timestamp and log level and send stdout and stderr to a file | |
| # - use_xtrace: If 'true', log every line of code as it is executed | |
| # - stderr_to_stdout: If 'true', redirect stderr to stdout | |
| configure_logging() { local path=$1; local stderr_to_stdout=$2; local use_xtrace=$3 | |
| mkdir -p "$(basename "$path")" | |
| exec 3>> "$path" | |
| exec > >(prefix_log INFO | tee -i >(cat >&3)) | |
| if [[ $stderr_to_stdout == true ]]; then | |
| exec 2> >(prefix_log ERROR) | |
| else | |
| exec 2> >(prefix_log ERROR | tee -i >(cat >&3) >&2) | |
| fi | |
| PS4=' TRACE - $(basename $BASH_SOURCE):$LINENO.$BASH_SUBSHELL${FUNCNAME[0]:+ [${FUNCNAME[0]}]} + ' | |
| if [[ $use_xtrace == true ]]; then | |
| set -x | |
| fi | |
| } |
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