#!/bin/bash
#
# Generate some make file dependency entries for a Fortran 90 file that employs "use".
#
# For every "use" statement, generate a dependency on lowercase(modulename).o
#
# Note: We assume that the name of a module and the same of source are the same.
#       The name of the source file should be all lower case (except for the extension).

# don't complain if *.F90 doesn't match any files
shopt -s nullglob

cat /dev/null > f90mkdepend.log

for filename in *.F90 *.F *.h; do
  # quick check for "use" to speed up processing
  if grep -i '^ *use ' $filename | grep -iv '^ *use this' $filename > /dev/null; then
    # extract module name in lower case
    modreflist=$(grep -i '^ *use ' $filename | grep -iv '^ *use this' | awk '{print tolower($2)}' | sed 's/,.*$//') 

    echo "$filename => $modreflist" >> f90mkdepend.log

    # change .F90 into .f90, .F into .f for target
    preprocessed=$(echo $filename | sed -e 's/\.F$/.f/' -e 's/\.F90$/.f90/')

    depline="$preprocessed:"
    for m in $modreflist; do
      # ignore modules that don't have an appropriately named source file
      if [ -f $m.F90 ] || [ -f $m.F ]; then
        depline="$depline $m.o"
      elif [ -f ${m%_mod}.F90 ] || [ -f ${m%_mod}.F ]; then
        # source file name is module name without "_mod"
        depline="$depline ${m%_mod}.o"
      else
        echo "WARNING: f90mkdepend: no source file found for module $m" 1>&2
      fi
    done
    echo $depline
  fi
done