#!/bin/csh -f
# windiff
# -----------------------------------------------------------------------------
# C shell script to compare 2 directory trees.
# Compare the specified files or folders via DeltaWalker, if installed, which
# allows you to view differences, reconcile them, edit the files, search 
# within the files, etc.  Otherwise, compare via standard Unix diff.
# -----------------------------------------------------------------------------
# Revision History:
#   $Log$
# -----------------------------------------------------------------------------

set deltawalker = "/Applications/DeltaWalker.app/Contents/MacOS/DeltaWalker"
if (-e $deltawalker:q) then
   # $PWD  Explicitly convert the relative paths to absolute, if necessary, 
   #       since DeltaWalker ignores the current directory and assumes it got 
   #       full pathnames.
   #       Note: This also has the nice side effect of filling in the current
   #             directory as defaults for both params when omitted, so that it
   #             starts out comparing current directory to itself, and the user
   #             can navigate from there.
   # &     Run as a background process so that this script can complete
   #       immediately.  
   #       No.  Bad idea.  Require the user to specify it when calling the 
   #       script instead, in typical Unix style.  Then the user can specify 
   #       it or not, while if we did it automatically, he'd have no way to 
   #        omit it.
   # Quotes required in case filenames have spaces and come in with them 
   #        escaped with backslashes that get stripped off on the way in.
   #        Note: Must be double quotes, not single.  Otherwise $PWD is not
   #              expanded.
   # Note: -vmargs -X... must be at very end of command line
   
   # Assume file 1 is a relative filename.
   set file1 = "$PWD/$1"
   
   # If not found relative, assume file 1 is an absolute filename.
   if (! -e $file1:q) set file1 = $1:q
   
   # Assume file 2 is a relative filename.
   set file2 = "$PWD/$2"
   
   # If file 2 is a relative directory, use the same named file 1 inside it.
   if (-d $file2:q && -e $file2:q/$1:q) set file2 = $file2:q/$1:q
   
   # If not found relative, assume file 2 is an absolute filename.
   if (! -e $file2:q) set file2 = $2:q
   
   # If file 2 is an absolute directory, use the same named file 1 inside it.
   if (-d $file2:q && -e $file2:q/$1:q) set file2 = $file2:q/$1:q
   
   $deltawalker:q -mi -nosplash "$file1" "$file2" -vmargs -Xmx1024M
   
   # The following didn't work because there was no way to pass command line
   # options and args to DeltaWalker.  It always opened empty, and used splash
   # screen.
   # -n   New instance of DeltaWalker, even if another instance is already open.
   # open -n -a '/Applications/DeltaWalker.app' $*
   # ?? How to specify DeltaWalker options like:   -mi -nosplash
else
   diff -r $*:q | less
   # -r = Recursive
   
   # You may prefer the following:
   # diff -r -y -W 200 $*:q | less
   # -r     = Recursive
   # -y     = Side-by-side output
   # -W 200 = 200 columns wide for side-by-side output 
endif