#!/bin/bash
#  logging - __package__ logging library

set -e

lib_load 'core/file'

######
# Settings

# logging - Enables logging
logging=${logging:-false}

# logdir - Location for log files
logdir=${logdir:-/home/zwelch/src/mcf/mcsh/install/log/mcsh}


######
# Configuration

log_config_init() {
	lib_setting_vars logging
	lib_setting_vars -ro logdir
}


######
# Output support

# log_pipe - Passes stdin to stdout, saving a copy to file ($1).
log_pipe() {
	has_args 1 "$@"
	logging=false pretend=false file_mkdir "$1"
	tee -a "$1"
}


######
# Log file support

# log_filename - Returns log filename given its base name ($1).
log_filename() {
	echo "$logdir/${1:-main}.log}"
}

# log_rotate - Rotates log file ($1), saving $2 (int) old files.
log_rotate() {
	has_args 2 "$@"
	local log=$1
	local dst=$2

	if [ $dst -eq 0 ]; then
		if [ -f "$log" ]; then
			run mv "$log" "$log.$dst"
			run gzip "$log.$dst"
		fi
		return
	fi

	local src
	src=$(($dst - 1))
	if [ -f "$log.$src.gz" ]; then
		run mv "$log.$src.gz" "$log.$dst.gz"
	fi

	log_rotate "$log" "$src"
}