commit de3a169fa5a7b0b17a60dfd348a527a1b7d8b218
Author: Julio Biason <julioandre@cwi.com.br>
Date:   Tue Jan 14 13:32:57 2014 -0200

    initial version of the magical script

diff --git a/auto-virtualenv.sh b/auto-virtualenv.sh
new file mode 100644
index 0000000..9ff64d2
--- /dev/null
+++ b/auto-virtualenv.sh
@@ -0,0 +1,41 @@
+# --- activate a virtualenv without the need of going through a series of
+#     paths
+function venv { source $WORKON_HOME/$1/bin/activate; }
+
+# --- create a virtualenv
+function mkenv { virtualenv $WORKON_HOME/$1; venv $1; echo "$1" > ./.venv; }
+
+# --- automagically load virtualenvs, based on the ".venv" file in the directory
+
+# -- search for the ".venv" from the current directory and, if it can't be found,
+#    go through the parent directories all the way to the system root
+function _upwards_search {
+	venv=""
+	curdir=`pwd`
+
+	while [[ `pwd` != '/' ]]; do
+		if [ -f ./.venv ]; then
+			venv=`cat ./.venv`
+			break
+		fi
+		cd ..
+	done
+
+	cd $curdir
+	echo $venv;
+}
+
+# -- replacement for "cd", which will check the virtualenv file
+function _venv_cd { 
+	if [ ! -f $PWD/$1 -a "$VIRTUAL_ENV." != "."  ]; then 
+		deactivate
+	fi;
+	\cd $1
+	venv=$(_upwards_search)
+	if [ -n $venv ]; then 
+		venv $venv 
+	fi
+}
+
+# -- replace "cd" with our magical "cd"
+alias cd=_venv_cd