#! /usr/bin/env tcsh

set ddir = diffs
set rdirs = ( results_* )

# verify that there are differences to view
if ( $#rdirs < 2 ) then
    echo cannot proceed, we need at least 2 result directories
    exit
endif

# make sure the output directory exists
if ( -d $ddir ) then
    echo removing old diffs
    \rm -f $ddir/* >& /dev/null
else
    mkdir $ddir
    if ( ! -d $ddir ) then
        echo failed to make output directory, $ddir
        exit
    endif
endif

set r1 = $rdirs[1]
set r2 = $rdirs[$#rdirs]

cd $r2

foreach file (*)
    echo $file...
    diff ../$r1/$file $file >& ../$ddir/d.$file
end