#!/bin/sh
#-----------------------------------------------------------------------
# Create a virtual copy of the uvf_difmap distribution. This will
# be the place where the compilation takes place. All source-code
# and generic configuration files will be linked to the originals
# via symbolic links.
#-----------------------------------------------------------------------
#
# Usage:
#  make_links uvf_difmap_dir target_dir
#
#-----------------------------------------------------------------------

if [ $# -ne 2 ] ; then
  echo "Usage: make_links uvf_difmap_dir target_dir"
  exit 1
else
  source_dir="$1"
  target_dir="$2"
fi

#
# Make sure that the source directory exists.
#
if [ ! -d "$source_dir" ] ; then
  echo "Source directory \"$source_dir\" does not exist."
  exit 1
fi

#
# Require the target_dir to have already been created.
#
if [ ! -d "$target_dir" ] ; then
  echo "Target directory \"$target_dir\" does not exist. Please create it."
  exit 1
fi

#
# Make realtive source-file searching easier by cd'ing to the
# source top-level directory.
#

cd $source_dir

#
# Create sub-directories where necessary.
#

for dir in *_src include lib; do
  abs_dir=$target_dir/$dir
  if [ ! -d $abs_dir ]; then
    \rm -rf $abs_dir
    mkdir $abs_dir
  fi
done

#
# Make links to the sub-set of files in the top-level directory that
# are required for compilation.
#

for file in makeall clean configure; do
  source=$source_dir/$file
  target=$target_dir/$file
  if [ ! -h $target ] ; then
    ln -s $source $target
  fi
done

#
# Make links to the sub-set of files in each source directory needed
# for compilation.
#

for dir in *_src include; do
(
  cd $dir
  for file in *; do
    source=$source_dir/$dir/$file
    target=$target_dir/$dir/$file
    case $file in
     *.[chf] | makefile.distrib)
     if [ ! -h $target ] ; then
       ln -s $source $target
     fi
     ;;
    esac
  done
)
done

#
# Link un-handled files in cpg_src.
#

(
  cd cpg_src
  for file in listfn make_file_list makefile.lis prototypes;do
    source=$source_dir/cpg_src/$file
    target=$target_dir/cpg_src/$file
    if [ ! -h $target ] ; then
      ln -s $source $target
    fi
  done
)