Added support for lesspipe and lesspipe.sh under OSX

zshrc

@@ -54,12 +54,6 @@ LESS="-c -x4 -R -MM -PMFile\:?f%f:STDIN. ?BSize\:?B%B:Unk.?B\:?pb%pb\%:Unk.?B\:%
 LESSCHARSET=utf-8
 READNULLCMD=/usr/bin/less
 PAGER=/usr/bin/less
-if [ -x =lesspipe ]; then
-    eval `lesspipe`
-fi
-if [ -x =lesspipe.sh ]; then
-    eval `lesspipe.sh`
-fi
 
 
 EDITOR=vi
@@ -171,6 +165,15 @@ if [ `uname -s` = "Darwin" ]; then
   fi
 fi
 
+LESSPIPE=`which lesspipe`
+if [ $? -eq 0 ]; then
+    eval `$LESSPIPE`
+fi
+LESSPIPE=`which lesspipe.sh`
+if [ $? -eq 0 ]; then
+    eval `$LESSPIPE`
+fi
+
 # Process Local file
 for localDir in /etc/zsh /etc /usr/local/etc /usr/local/etc/zsh; do
     if [ -f ${localDir}/zshrc.local ]; then