fix-ghc-symlinks

#!/bin/bash

echo "After installing a new version of GHC the system wide executable symbolic"
echo "links will be pointed directly to the installed version instead of the"
echo "very useful 'Current' link in /Library/Frameworks/GHC.framework/Versions."
echo "This is a problem because the 'switch-ghc' script will no longer work."
echo
echo "To fix this this script deletes the GHC related symlinks in both /usr/bin"
echo "(default installs) and /usr/local/bin (snapshot installs)."
echo
echo "After deleting the direct symlinks we create a new set of links pointing"
echo "to the 'Current' version. From now on we can safely manage the current GHC"
echo "version with the 'switch-ghc' script."
echo
echo "The tools involved are: ghc, ghci, ghc-pkg, haddock, runghc and runhaskell. "
echo
echo "Press ENTER to continue, CTRL-C to abort."
echo

read

for i in ghc ghci ghc-pkg haddock runhaskell runghc hsc2hs
do
  find /usr/bin/$i       -type l -exec rm {} \;
  find /usr/local/bin/$i -type l -exec rm {} \;
  ln -s /Library/Frameworks/GHC.framework/Versions/Current/usr/bin/$i /usr/bin/$i
done

exit

echo Done.
echo You should now probably run switch-ghc and pick your favorite compiler!

switch-ghc

#!/bin/bash
VERSION=$1

pushd /Library/Frameworks/GHC.Framework/Versions/ > /dev/null

if [ "${VERSION}" = "" ]
then
  echo Please specify version of GHC to switch to.
  ls | grep -v Current
  exit
fi

rm Current
ln -s $(ls | grep "^${VERSION}") Current

echo -n "Current:"
ls -l Current | cut -d ">" -f 2

popd > /dev/null