kconfig_merge

#!/bin/bash
#
# Copyright 2013  phjanderson
# 
# 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 <http://www.gnu.org/licenses/>.
#

if [ $# -lt 2 ]
then
  echo "Kernel config merge tool 1.0.0
by phjanderson

Usage: ./kconfig_merge.sh source_file change_file

Only entries from the source file are returned which do not present in the change file.
"
  exit -1
fi

source_filename="$1"
if [ ! -f "$source_filename" ]
then
  echo "Error: source file \"$source_filename\" not found!"
  exit -1
fi

change_filename="$2"
if [ ! -f "$change_filename" ]
then
  echo "Error: change file \"$change_filename\" not found!"
  exit -1
fi

declare -A change_config

while read -r line
do
  normalized_line="$line"
  if [[ "$line" =~ ^#\ ([^\ ]*)\ is\ not\ set ]]
  then
    normalized_line="${BASH_REMATCH[1]}=###"
  fi
  
  if [[ "$normalized_line" =~ ^([^=]*)=.* ]]
  then
    key="${BASH_REMATCH[1]}"
    change_config["$key"]="1"
  fi
done < "$change_filename"


while read -r line
do
  normalized_line="$line"
  if [[ "$line" =~ ^#\ ([^\ ]*)\ is\ not\ set ]]
  then
    normalized_line="${BASH_REMATCH[1]}=###"
  fi
  
  if [[ "$normalized_line" =~ ^([^=]*)=(.*) ]]
  then
    key="${BASH_REMATCH[1]}"
    value="${BASH_REMATCH[2]}"

    if [ ! "${change_config[$key]+isset}" ]
    then
      echo $line
    fi
  fi
done < "$source_filename"

cat "$2"