MM material converter

mtlc.sh

#!/usr/bin/env bash

#  mtlc.sh - convert materials
#
#  Copyright 2020 Riku Salminen
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <https://www.gnu.org/licenses/>.

SUFFIX="_fixed"

if [ -z "$1" ]; then
  echo "usage: mtlc.sh [FILE]"
  exit 1
fi

NEWFILE="${1%.*}$SUFFIX.${1##*.}"

if [ -f "$NEWFILE" ]; then
  echo "warning: overwriting existing file: $NEWFILE"
  > "$NEWFILE"
fi

while IFS= read -r line; do
  echo "$line" >> "$NEWFILE"

  if [ "$line" == "newmtl __TB_empty" ]; then
    continue
  fi

  echo "map_Kd ${line##*/}" >> "$NEWFILE"
done < "$1"

echo "wrote new file to: $NEWFILE"