#! /usr/bin/env bash

# $Header: /home/ubuntu/mnt/e9_copy/MITgcm_contrib/jmc_script/mk_mkfile,v 1.2 2012/01/23 23:40:01 jmc Exp $
# $Name:  $

mkfile='Makefile'
if [ $# -ge 1 ] ; then
  if test $1 = '-h' ; then
    echo "Usage: `basename $0` MAKEFILE (default: 'Makefile') ; [-h] print this"
    exit 9
  fi
  mkfile=$1
fi

if test ! -f $mkfile ; then
  echo "`basename $0` error: missing file '$mkfile'"
  exit 8
fi

cmdline=`grep '^# .*genmake2 ' $mkfile | sed 's/^# *//'`
echo " get Command-Line from file '$mkfile' :"
echo $cmdline

printf "===  Parse Options  ===\n"
CMDLINE=
MODS=
flg=0
MPI=0
prev=
dbq=0 ; sgq=0 ; keep=
# put newline between word in cmdline:
# CMDLINE=`echo $cmdline | awk '{ for(i=1;i<=NF;i++) print $i}'`
#echo "CMDLINE='$CMDLINE'"
for xx in $cmdline
do
  arg=`echo $xx`
  # glue multiple words argument (unbalanced starting & ending double quote)
  n1=`echo $xx | grep -c '^"'`
  n2=`echo $xx | grep -c '"$'`
  if [ $n1 -eq 1 -a $n2 -eq 0 ] ; then
      dbq=1; keep=$xx
      continue
  fi
  if [ $n1 -eq 0 -a $dbq -eq 1 ] ; then
    if [ $n2 -eq 1 ] ; then
      n1=$dbq ; dbq=0
      xx="$keep $xx"
    else
      keep="$keep $xx"
      continue
    fi
  fi
  # remove starting & ending double quote
  if [ $n1 -eq 1 -a $n2 -eq 1 ] ; then
      arg=`echo $xx | sed 's/^"//' | sed 's/"$//'`
  fi
  # glue multiple words argument (unbalanced starting & ending single quote)
  n1=`echo $xx | grep -c "^'"`
  n2=`echo $xx | grep -c "'$"`
  if [ $n1 -eq 1 -a $n2 -eq 0 ] ; then
      sgq=1; keep=$xx
      continue
  fi
  if [ $n1 -eq 0 -a $sgq -eq 1 ] ; then
    if [ $n2 -eq 1 ] ; then
      n1=$sgq ; sgq=0
      xx="$keep $xx"
    else
      keep="$keep $xx"
      continue
    fi
  fi
  # remove starting & ending single quote
  if [ $n1 -eq 1 -a $n2 -eq 1 ] ; then
      arg=`echo $xx | sed "s/^'//" | sed "s/'$//"`
  fi
  # process "arg"
  opt=`expr "x$arg" : 'x[^=]*=\(.*\)'`
# echo "xx='$xx' ; arg='$arg' ; opt='$opt'"
  # sav "arg" to CMDLINE <- not actually used
  #eqs=`echo $arg | grep -c '='`
  #if [ $eqs -gt 0 ] ; then
  #  pfx=`echo $arg | sed 's/=.*$/=/'`
  #  nw=`echo $opt | wc -w`
  #  if test $nw = '1' ; then
  #    CMDLINE="$CMDLINE $pfx$opt"
  #  else
  #    CMDLINE="$CMDLINE $pfx'$opt'"
  #  fi
  #else
    nw=`echo $arg | wc -w`
    if test $nw = '1' ; then
      CMDLINE="$CMDLINE $arg"
    else
      CMDLINE="$CMDLINE '$arg'"
    fi
  #fi
  if test -n "$prev" -a $flg = '1' ; then
      eval "$prev=\$arg"
      prev=
      continue
  fi
  case $arg in
   -mpi | --mpi | -mpi=* | --mpi=* )
      MPI=`expr $MPI + 1` ;;
   -mods | --mods | -mo | --mo )
      prev=MODS
      flg=`expr $flg + 1` ;;
   -mods=* | --mods=* | -mo=* | --mo=* )
      MODS=$opt
      flg=`expr $flg + 1` ;;
    *) ;;
  esac
done

printf "=== \n"
echo " Set MPI='$MPI' ; MODS='$MODS'"
#echo "flg='$flg'"

if [ $flg -lt 1 ] ; then
  echo "`basename $0` error: no '-mods' found"
  exit 4
fi
if [ $flg -gt 1 ] ; then
  echo "`basename $0` error: found multiple '-mods' ($flg)"
  exit 3
fi
if [ $MPI -gt 1 ] ; then
  echo "`basename $0` error: found multiple '-mpi' ($MPI)"
  exit 2
fi

#---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|

printf "===  Link / Unlink *_mpi files from 'MODS' dirs  ===\n"
printf "  MODS dir: "
MPI_LNKF=
for d in $MODS ; do
    if test ! -d $d ; then
	echo
	echo "Error: MODS directory \"$d\" not found!"
	exit 1
    else
	printf "$d "
	#SOURCEDIRS="$SOURCEDIRS $d"
	#INCLUDEDIRS="$INCLUDEDIRS $d"
	#-------------------------------------------------------
	# Put special links so that MPI specific files are used
	MPI_FILES=`(cd $d ; find . -name "*_mpi" -print)`
	for i in $MPI_FILES ; do
	  ii=`echo $i | sed 's:^\./::'`
	  name=`echo $ii | sed 's:_mpi::' `
	  if test $MPI = 0 ; then
	  # NO: We undo an _mpi symbolically linked file
	    if test -L $name ; then
	      cmp $name "$d/$ii" > /dev/null 2>&1
	      RETVAL=$?
	      if test "x$RETVAL" = x0 ; then
		printf "Un-linking $name ; "
		rm -f $name
	      fi
	    fi
	  else
	  # YES: We symbolically link this file (with conditions if already there)
	    src="$d/$ii"
	    if test $name = "SIZE.h" -a -f SIZE.h.mpi ; then src="SIZE.h.mpi" ; fi
	    if test -L $name ; then
	      cmp $src $name > /dev/null 2>&1
	      RETVAL=$?
	      yy=0 ;
	      for xx in $MPI_LNKF ; do if test $xx = $name ; then yy=1 ; fi ; done
 	      if test "x$RETVAL" != x0 -a $yy = 0 ; then
	      # remove sym-link if different and has not just been linked
		printf "Un-link + "
		rm -f $name
	      fi
	      if test "x$RETVAL" = x0 ; then
	      # if identical, keep sym-link and keep record of it
		MPI_LNKF="$MPI_LNKF $name"
	      fi
	    fi
	    if ! test -f $name ; then
	      # make sym-link and keep record of it
		printf "Linking $src to $name ; "
		ln -sf $src $name
		MPI_LNKF="$MPI_LNKF $name"
	    fi
	  fi
	done
	#-------------------------------------------------------
    fi
done
echo
echo "MPI_LNKF='$MPI_LNKF'"

#---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
printf "===  Generate new Makefile  ===\n"
#echo $CMDLINE
#eval $CMDLINE
echo $cmdline
eval $cmdline