added auto-update for other Unixes

auto-update

@@ -10,7 +10,24 @@ relaunchCompilation() {
     done
 }
 
-# launch a cabal install and cabal test after each
-# small haskell file modification
-{hobbes "*.hs" | relaunchCompilation } &
-hobbes "*.cabal" | relaunchCompilation
+case $(uname) in
+Darwin)
+    # On mac OS X, use hobbes (cabal install hobbes)
+    # launch a cabal install and cabal test after each
+    # small haskell file modification
+    {hobbes "*.hs" | relaunchCompilation } &
+    hobbes "*.cabal" | relaunchCompilation
+    ;;
+*)  # On other Unixes
+    currenttime=$(date +"%s")
+    while true; do
+      for fic in {src,test}/**/*.hs(.) *.cabal; do
+          # note to use on OS X, use "stat -f %m $checkfile" instead
+          modtime=$(stat --printf %Y $fic)
+          (( $modtime > $currenttime)) && print $fic
+      done
+      currenttime=$(date +"%s")
+      sleep 1
+    done | relaunchCompilation
+    ;;
+esac