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#!/bin/bash
#%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%#
# Weechat log file converter [Thomas Lange <code@nerdmind.de>] #
#%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%#
# #
# This script can convert WeeChat log files to another format like markdown or #
# better readable plaintext. The script assumes that the WeeChat log files are #
# given in the following format: 2019-01-10 22:52:30\t<username>\t<message> #
# #
# OPTION [-f]: Output format ("md" or "txt"; default is "txt") #
# #
# USAGE: #
# weechatlog {-f txt|md} username.log > converted.txt #
# cat username.log | weechatlog {-f txt|md} > converted.txt #
# #
#%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%#
#===============================================================================
# Parse command-line arguments with getopts
#===============================================================================
ARGUMENT_FORMAT="txt" # default output format
while getopts :f: option
do
case $option in
f) ARGUMENT_FORMAT="$OPTARG" ;;
esac
done; shift $((OPTIND-1))
#===============================================================================
# Pattern part
#===============================================================================
PATTERN_DATE="\([0-9]*\)-\([0-9]*\)-\([0-9]*\)" # References: 1, 2, 3
PATTERN_TIME="\([0-9]*\):\([0-9]*\):\([0-9]*\)" # References: 4, 5, 6
PATTERN="${PATTERN_DATE} ${PATTERN_TIME}\t\([^ ]*\)\t\(.*\)"
#===============================================================================
# Replace part
#===============================================================================
case $ARGUMENT_FORMAT in
txt) REPLACE='\7 am \3.\2.\1 um \4:\5:\6:\n\8\n' ;;
md) REPLACE='**<u>\7</u> <small>am \3.\2.\1 um \4:\5:\6:</small>**\n<p>\8</p>\n' ;;
*) echo "Unknown format (-f): $ARGUMENT_FORMAT" && exit 1
esac
#===============================================================================
# Execute sed
#===============================================================================
if [ -z "$1" ]; then
sed "s#$PATTERN#$REPLACE#" # read input from stdin
else
sed "s#$PATTERN#$REPLACE#" "$1"
fi
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