#!/bin/bash

# tlog
# ====
# Usage: tlog TARGET [OPTIONS]
#
# Writes input to a target file while stripping ANSI codes, and returns input
# as it was.

help_msg() {
  cat <<-EOF
	Usage: tlog FILENAME [OPTIONS]
	Options:
	 -a, --append  append to target file instead of overwriting
	 -h, --help    print this message
	EOF
  exit 1
}

err_msg() {
  (>&2 echo "$1")
  exit 1
}

if [[ $# -lt 1 ]]; then
  err_msg "Usage: tlog TARGET [OPTIONS]"
fi

APPEND=0
LOGFILE=
while [[ $# -gt 0 ]]; do
  case $1 in
    -a|--append) APPEND=1; shift;;
    -h|--help)   help_msg;;
    *)           LOGFILE=$1; shift;;
  esac
done

if [[ -z $LOGFILE ]]; then
  err_msg "Usage: tlog TARGET [OPTIONS]"
elif [[ $APPEND -eq 1 ]]; then
  tee >(sed 's/\x1b\[[0-9;]*[mK]//g' >> "$LOGFILE")
else
  tee >(sed 's/\x1b\[[0-9;]*[mK]//g' > "$LOGFILE")
fi