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#!/bin/bash
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FC=($(fedpkg verrel | awk -F. '{print $NF}'))
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SRC=($(ls config-* 2>/dev/null))
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TGT=($(ls kernel-*.$FC/linux-*.$2/configs/kernel-*-*.config \
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          kernel-*.$FC/linux-*.$2/configs/kernel-*-*-debug.config 2>/dev/null))
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TGT1=(${TGT[*]#kernel-*.$FC/linux-*.$2/configs/kernel-*-})
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ALL_OPTS="cdfimn"
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if [ $# -lt 2 ] ; then
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   echo -e "Usage:\n   $(basename $0) [-$ALL_OPTS] input target\n"
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   echo -e " Sort input config file into the same order as the target\n"
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   echo -e "      -c: insert comments about non-matching/impossible items"
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   echo -e "      -d: show raw unsorted output with extra debug text"
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   echo -e "      -f: force output to match what is in the target config,"
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   echo -e "          and/or remove impossible config items"
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   echo -e "      -i: find impossible config items"
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   echo -e "      -m: find changed config items"
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   echo -e "      -n: do not sort output\n"
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   echo -e "   input: source config file" ' [' "${SRC[*]#config-}" ']\n'
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   echo -e "  target: output arch name" ' [' "${TGT1[*]%.config}" ']\n'
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   exit 1
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fi
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while getopts "$ALL_OPTS" OPTION ; do
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case $OPTION in
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c)
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   ADDCOMMENT=1 ;;
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d)
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   DEBUG=1 ;;
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f)
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   FORCE=1 ;;
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i)
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   FIND_IMPOSS=1 ;;
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m)
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   FIND_CHANGED=1 ;;
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n)
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   NOSORT=1 ;;
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\?)
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   exit 2 ;;
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esac
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done
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if [ "$FORCE" -a "$ADDCOMMENT" ] ; then
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	echo "-f and -c options cannot be used together"
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	exit 2
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fi
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shift $((OPTIND-1))
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TEMPFILES="xx00 xx01 xx98 xx99"
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TEMPLEFT=
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for FILE in $TEMPFILES ; do
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   [ -f "$FILE" ] && TEMPLEFT="Y"
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done
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if [ "$TEMPLEFT" ] ; then
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   echo "WARNING! Output files named xx?? already exist." >&2
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   read -p "Press <Enter> to erase files, or Ctrl-C to exit..."
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   echo >&2
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fi
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rm -f $TEMPFILES
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SRCFILE=config-$1
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[ ! -f $SRCFILE ] && echo "Input file" $SRCFILE "missing" && exit 2
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TGTFILE=kernel-*.$FC/linux-*.$2/configs/kernel-*-$2.config
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[ ! -f $TGTFILE ] && echo "No target file matching" $TGTFILE "exists" && exit 2
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[ "$FIND_IMPOSS" ] && \
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   find kernel-*.$FC/*.$2 -name Kconfig\* -type f \
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   | xargs egrep -s -h '^[[:space:]]*(menu)?config[[:space:]]+' \
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   | sed -r 's/^[[:space:]]*(menu)?config[[:space:]]+/CONFIG_/' \
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   | sort | uniq >xx98
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extract_optname() {
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         # extract the option name from $TEXT, setting $OPTNAME
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         OPTNAME=
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         if [ "${TEXT:0:7}" = "CONFIG_" ] ; then
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            OPTNAME=${TEXT%%=*}
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         elif [ "${TEXT:0:9}" = "# CONFIG_" ] ; then
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            OPTNAME=${TEXT%" is not set"}
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            OPTNAME=${OPTNAME#\# }
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         fi
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}
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print_saved_comments() {
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      if [ $IX -gt 0 ] ; then
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         [ "$DEBUG" ] && echo "            ->" $IX "comments were saved"
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         (( IX-- ))
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         for IX in $(seq 0 $IX) ; do
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            echo "$LINE":"${SAVECOMMENT[$IX]}"
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         done
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         unset SAVECOMMENT
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         IX=0
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      fi
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}
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assign_line_number() {
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      # use input line numbers if not sorting
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      [ "$NOSORT" ] && LINE=$IN
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      # make sure it has a line number
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      [ -z "$LINE" ] && LINE=999999
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}
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IX=0
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IN=0
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declare -a SAVECOMMENT
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cat ${SRCFILE} | {
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while read TEXT ; do
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   LINE=
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   COMMENT=
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   # replace empty lines
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   [ -z "$TEXT" ] && TEXT='//'
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   if [ "${TEXT:0:7}" = "CONFIG_" -o "${TEXT:0:9}" = "# CONFIG_" ] ; then
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      LINE=$(grep -n "^$TEXT" $TGTFILE | head -1 | cut -f 1 -d ':')
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      if [ -z "$LINE" ] ; then
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         [ "$DEBUG" ] && echo "nofind      ->" "$TEXT"
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         extract_optname
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         if [ "$OPTNAME" ] ; then
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            if [ "$FIND_CHANGED" ] ; then
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               for FINDTEXT in "^${OPTNAME}=" "^# ${OPTNAME} is not set" ; do
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                  if [ -z "$LINE" ] ; then
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                     [ "$DEBUG" ] && echo "looking for ->" "$FINDTEXT"
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                     LINE=$(grep -n "$FINDTEXT" $TGTFILE | head -1 | cut -f 1 -d ':')
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                     if [ "$LINE" ] ; then
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                        CHANGED=$(grep "$FINDTEXT" $TGTFILE | head -1)
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                        if [ "$FORCE" ] ; then
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                           TEXT=$CHANGED
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                           [ "$DEBUG" ] && echo 'forced      ->' "$TEXT"
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                        else
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                           if [ "$ADDCOMMENT" ] ; then
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                              if [ ${CHANGED:0:1} = '#' ] ; then
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                                 NEWOPT="not set"
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                              else
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                                 NEWOPT=${CHANGED#$OPTNAME}
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                              fi
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                              COMMENT="# -- Next option changed to \"${NEWOPT}\" at target line $LINE --"
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                           fi
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                        fi
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                     fi
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                  fi
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               done
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            fi
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            if [ "$FIND_IMPOSS" -a -z "$LINE" -a -z "$COMMENT" ] ; then
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               POSSIBLE=$(grep -n "^$OPTNAME" xx98)
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               if [ -z "$POSSIBLE" ] ; then
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                  if [ "$ADDCOMMENT" ] ; then
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                     COMMENT="# -- Next option is impossible --"
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                  elif [ "$FORCE" ] ; then
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                     [ "$DEBUG" ] && echo 'impossible  ->' "$TEXT"
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                     TEXT=""
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                  fi
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               fi
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            fi
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         fi
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      fi
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   else
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      # not a config variable
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      COMMENT="$TEXT"
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      TEXT=
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   fi
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   [ "$DEBUG" -a "$COMMENT" ] && echo "comment     ->" "$LINE" "$COMMENT"
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   [ "$DEBUG" -a "$TEXT" ]    && echo "text        ->" "$LINE" "$TEXT"
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   if [ "$TEXT" ] ; then
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      assign_line_number
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      # print the saved comments first
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      print_saved_comments
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      # now print the latest comment and text
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      [ "$COMMENT" ] && echo "$LINE":"$COMMENT"
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      echo "$LINE":"$TEXT"
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   elif [ "$COMMENT" ] ; then
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      # no output yet, save the comment
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      SAVECOMMENT[$IX]="$COMMENT"
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      let IX++
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      [ "$DEBUG" ] && echo 'savecomment (#'${IX}')'
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   fi
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   let IN++
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done
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# flush the buffers
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assign_line_number
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print_saved_comments
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[ "$DEBUG" ] && echo "$IN lines read from input"
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} >xx99
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if [ "$DEBUG" ] ; then
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   # just show the raw output with debug info, then exit
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   cat xx99
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else
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   # split output into two files, for matched and unmatched items
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   cat xx99 | sort -s -t ":" -k 1g | csplit -k -s - /^999999/ 2>/dev/null
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   cat xx00 | cut -f 2- -d ':' | sed 's/^\/\/$//'
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   if [ -s xx01 ] ; then
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      echo
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      echo '# ------------  UNMATCHED OPTIONS  ------------'
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      echo
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      cat xx01 | cut -f 2- -d ':' | sed 's/^\/\/$//'
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   fi
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fi
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rm -f $TEMPFILES