Multiple minor changes

zshrc

@@ -141,6 +141,16 @@ RPROMPT='`rprompt-git-current-branch`'
 RPROMPT+="%{$fg[yellow]%}%~%{$reset_color%}"
 RPROMPT+=' `cabal_sandbox_info`'
 
+function ghc-pkg-reset() {
+    read 'ans?erasing all your user ghc and cabal packages - are you sure (y/n) ? '
+    if [[ "$ans" =~ ^[Yy]$ ]] ; then
+        echo 'erasing directories under ~/.ghc'; rm -rf `find ~/.ghc -maxdepth 1 -type d`; \
+        echo 'erasing ~/.cabal/lib'; rm -rf ~/.cabal/lib; \
+        # echo 'erasing ~/.cabal/packages'; rm -rf ~/.cabal/packages; \
+        # echo 'erasing ~/.cabal/share'; rm -rf ~/.cabal/share; \
+    fi
+}
+
 extract(){
 	if [ -f $1 ] ; then
 		case $1 in