nad0020 OS X "Update Shell Profile" may not update $PATH if run more than once

            An instance of the shell script "Update Shell Profile.command"
            is installed in each "/Applications/Python x.x" folder.
            Clicking on the script allows the user to change the default
            Python version.  If the scripts are run more than once - say
            first to make 3.0 the default then 2.6 the default then back
            to 3.0 again - the script will fail to update the user's $PATH,
            forcing users to manually edit their shell profile.

SOLUTION    Ensure that $PATH is updated if there are other Python
            frameworks already on its head.

            (This is not the most elegant solution since it leaves the
            previous versions later in the path but it is safer to
            only append to the user's profile - and a backup copy
            is made.)

APPLIES     py3k, 3.0, trunk, 2.6

diff Mac/BuildScript/scripts/postflight.patch-profile

diff -r 47f5f4fa6aed Mac/BuildScript/scripts/postflight.patch-profile
--- Mac/BuildScript/scripts/postflight.patch-profile	Thu Feb 12 01:10:01 2009 -0800
+++ Mac/BuildScript/scripts/postflight.patch-profile	Thu Feb 12 01:35:04 2009 -0800
@@ -34,11 +34,14 @@
 esac
 
 # Now ensure that our bin directory is on $P and before /usr/bin at that
+# and that there is not another python framework before it
 for elem in `echo $P | tr ':' ' '`
 do
 	if [ "${elem}" == "${PYTHON_ROOT}/bin" ]; then
 		echo "All right, you're a python lover already"
 		exit 0
+	elif [ "${elem%%Versions/*}" == "${PYTHON_ROOT%%Versions/*}" ]; then
+	    break
 	elif [ "${elem}" == "/usr/bin" ]; then
 		break
 	fi
@@ -56,6 +59,12 @@
 	if [ -f "${RC}" ]; then
 		cp -fp "${RC}" "${RC}.pysave"
 	fi
+	grep -q "# Setting PATH for MacPython" "${RC}" && \
+	  echo "" && \
+	  echo "It looks like your profile was updated previously to another" && \
+	  echo "MacPython version.  This update should work but you may" && \
+	  echo "want to edit ${RC} to remove the old version." && \
+	  echo ""
 	echo "" >> "${RC}"
 	echo "# Setting PATH for MacPython ${PYVER}" >> "${RC}"
 	echo "# The orginal version is saved in .cshrc.pysave" >> "${RC}"
@@ -85,6 +94,12 @@
 if [ -f "${PR}" ]; then
 	cp -fp "${PR}" "${PR}.pysave"
 fi
+grep -q "# Setting PATH for MacPython" "${PR}" && \
+	echo "" && \
+	echo "It looks like your profile was updated previously to another" && \
+	echo "MacPython version.  This update should work but you may" && \
+	echo "want to edit ${PR} to remove the old version." && \
+	echo ""
 echo "" >> "${PR}"
 echo "# Setting PATH for MacPython ${PYVER}" >> "${PR}"
 echo "# The orginal version is saved in `basename ${PR}`.pysave" >> "${PR}"