#! /usr/bin/env bash

if test $# != 2
then
  echo "Usage:"`basename $0`"  {tex_file.templ} {data_file} :"
  echo " replace >>>PUT_LINE_NB:{variable_name}=<<< in file {tex_file.templ}"
  echo " with line number in file {data_file} that corresponds to the"
  echo " description of variable {variable_name} in {tex_file.templ}"
  echo "LIMITATION: a) no space (blank) between 'PUT_LINE_NB:' and variable name"
  echo "            b) no space (blank) in the variable name (but OK before '=')"
  echo "               (e.g.:  '#YYY =' works, but '# YYY=' does not)"
  exit
else
 texFil=$1
 inpFil=$2
fi
if test ! -f $texFil ; then echo " ERROR: file='$texFil' not found" ; exit ; fi
if test ! -f $inpFil ; then echo " ERROR: file='$inpFil' not found" ; exit ; fi

outFil=`echo $texFil.tex | sed 's/.templ//'`
tmpFil1=TTT_fil1.$$
tmpFil2=TTT_fil2.$$
dbug=

#texFil='inp_tst' ; outFil=tata ; tmpFil1=titi ; tmpFil2=toto
#dbug=1

rm -f $outFil $tmpFil1 $tmpFil2
cp -f $texFil $outFil
sed 's/ *//g' $inpFil > $tmpFil2

# take all the lines in texFil where a line-Nb needs to be added:
listR=`grep 'PUT_LINE_NB:' $texFil | sed 's/PUT_LINE_NB:/ PUT_LINE_NB:/g'`
if test $dbug ; then echo $listR ; fi

for pp in $listR
do
 #echo 'pp='$pp
 xx=`echo $pp | sed "s/PUT_LINE_NB://g"`
 #echo 'xx='$pp
 if test $pp != $xx
 then
#- select the variable name (=xx) to look for (in inpFil & texFil):
  if test $dbug ; then echo '  xx='$xx ' <- from pp='$pp ; fi
  xx=`echo $xx | sed 's/=.*$//g'`
  if test $dbug ; then echo ' Var name: xx='$xx ; fi
#- select the line in texFil that has been copied from inpFil
#    (and needs to receive a line Nb)
  grep $xx $texFil | grep -v 'PUT_LINE_NB:' | sed 's/^ *//g' > $tmpFil1
  if test -s $tmpFil1
  then
   #echo 'found' $xx 'in file:' $texFil
    yy=$xx
    nbT=`grep -c "^${yy}" $tmpFil1`
    if [ $nbT -gt 1 ]
    then
#- try to search for "xx=":
      yy="${xx} *="
      nbT=`grep -c "^${yy}" $tmpFil1`
      if test $dbug ; then echo " nbT='$nbT', yy='${yy}'" ; fi
    fi
  else
    nbT=0
  fi
  nn='XXX';
  if test $nbT = '1' ; then
#-  now take the only line that start with variable name "xx":
    LINE=`sed -n "/^${yy}/p" $tmpFil1 | sed 's/\*/\\\*/g'`
#-  find the same line in inpFil and take the line number (nn):
    inpUsed=$inpFil
    nbI=`grep -c "$LINE" $inpUsed`
    if test $dbug ; then echo "  LINE='$LINE' ; nbI='$nbI'" ; fi
    if test $nbI = '0' ; then
#-  try without blank:
      LINE=`sed -n "/^${yy}/p" $tmpFil1 | sed 's/\*/\\\*/g' | sed 's/ *//g'`
      inpUsed=$tmpFil2
      nbI=`grep -c "$LINE" $inpUsed`
      if test $dbug ; then echo "  LINE='$LINE' ; nbI='$nbI'" ; fi
    fi
    if test $nbI = 1
    then
      nn=`sed -n "/$LINE/=" $inpUsed`
    else
      if test $nbI = '0';
      then echo "no line '$LINE' found in file:" $inpFil
      else echo 'too many('$nbI') lines with "'$xx'" in file:' $inpFil
      fi
    fi
  else
    if test $nbT = '0';
    then echo 'did not find "'$xx'" in file:' $texFil
    else echo 'too many('$nbT') "'$xx'" in file:' $texFil
    fi
  fi
#- replace by the line number (if found), XXX otherwise:
  sed "s/PUT_LINE_NB:${xx} *=/$nn/" $outFil > $tmpFil1
  if test $dbug ; then echo " Replace PUT_LINE_NB:${xx}= by line number: nn=$nn" ; fi
  mv $tmpFil1 $outFil
 fi
done
rm -f $tmpFil1 $tmpFil2
if test $dbug ; then echo diff $outFil $texFil ; diff $outFil $texFil ; fi

exit