Remove comments from Latex files

comment-cleanup.sh

#!/bin/bash

## Clean-up Comments from Latex Source Files 
## Copyright (c) 2020 Ali Parsai ali@parsai.net
## 
## Dependencies: sponge from moreutils, latexpand, sed, cat, mv, date, cp
## 
## CAUTION: Use version control or backup your files before using this script.
##
## How to use: comment-cleanup.sh TEX_FILE(S)
## 
## 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/>.
##

check_dependency () {
  if type $1 ; then
    echo "==> $1 found."
  else
    echo "==> $1 not found. Exitting."
    exit 1
  fi
}

check_dependency mv
check_dependency cp
check_dependency date
check_dependency cat
check_dependency sed
check_dependency sponge
check_dependency latexpand



dt=$(date '+%d%m%Y-%H%M%S')
for src in "$@"
  do
    backup="${src}.bak.${dt}"
    cp -v "$src" "$backup"
  done

for src in "$@"
  do
    dest="${src/.tex/-stripped.tex}"
    latexpand --empty-comments --keep-includes "$src" > "$dest"
    sed -i '/^\s*%/d' "$dest"
    cat -s "$dest" | sponge "$dest"
    mv "$dest" "$src"
    echo "==> Processed: $src"
  done