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/usr/share/ngraph-gtk/addin/ps2gra.nsc is in ngraph-gtk-addin-import-ps 6.06.13-3.

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The actual contents of the file can be viewed below.

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# Description: import _PS...,Import PostScript image,ps
# Description: import _EPS...,Import Encapsulated PostScript image,eps
# Description: import _PDF...,Import Portable Document Format image,pdf

PSTOEDIT_COMMAND="pstoedit"
PSTOEDIT_OPTION="-q -flat 0.1 -nc -ssp -dt"

RUBY_COMMAND="ruby"

ps2gra_error_dialog() {
    new dialog
    dialog::message "$1"
    del dialog
}

set +e

if which -q $PSTOEDIT_COMMAND
then
    true
else
    ps2gra_error_dialog "Cannot execute '$PSTOEDIT_COMMAND'."
    exit
fi

new dialog
ps_file=`get dialog -field get_open_file:$1`
del dialog

if [ -z "$ps_file" ]
then
    exit
fi

if [ ! -r "$ps_file" ]
then
    ps2gra_error_dialog "cannot open $ps_file"
    exit
fi

gra_file="`pwd`/`basename $ps_file .$1`.gra"

if [ -e "$gra_file" ]
then
  new dialog
  response=`get dialog -field yesno:"The file '$gra_file' already exists. Do you want to replace it?"`
  del dialog
  if [ x"$response" != "x1" ]
  then
      exit
  fi
fi

fig_file="${system::temp_file}"

$PSTOEDIT_COMMAND $PSTOEDIT_OPTION -f fig "$ps_file" "$fig_file"
if [ ! -r "$fig_file" ]
then
    ps2gra_error_dialog "Faital error occurred while execute pstoedit."
    system::unlink_temp_file "$fig_file"
    exit
fi

if which -q $RUBY_COMMAND
then
    $RUBY_COMMAND "${system::data_dir}/addin/fig2gra.rb" "$fig_file" "$gra_file"
else
    . "${system::data_dir}/addin/fig2gra.nsc"
    fig2gra "$fig_file" "$gra_file"
fi
system::unlink_temp_file "$fig_file"
rm -f "$fig_file"*
if [ ! -r "$gra_file" ]
then
    ps2gra_error_dialog "Fatal error occurred while executing fig2gra."
    exit
fi

for i in `object merge -instances`
do
    merge_file=`get merge:$i -field file`
    if [ "$merge_file" = "$gra_file"]
    then
	exit
    fi
done

new merge
merge::file="$gra_file"

menu::draw
menu::unfocus
menu::focus merge:!
menu::modified=true