fix wipeenv for editable packages

Based on
https://bitbucket.org/virtualenvwrapper/virtualenvwrapper/pull-requests/81
from Daniel Cordero

Author: dhellmann

tests/test_wipeenv.sh

@@ -32,10 +32,10 @@ test_wipeenv_pip_e () {
     mkvirtualenv "wipetest" >/dev/null 2>&1
     (cd tests/testpackage && pip install -e .) >/dev/null 2>&1
     before="$(pip freeze)"
-    assertTrue "testpackage not installed" "pip freeze | grep testpackage"
+    assertTrue "testpackage not installed: $before" "pip freeze | grep testpackage"
     wipeenv >/dev/null 2>&1
     after="$(pip freeze)"
-    assertFalse "testpackage still installed" "pip freeze | grep testpackage"
+    assertFalse "testpackage still installed: $after" "pip freeze | grep testpackage"
 }
 
 # test_wipeenv_pip_e_url () {

virtualenvwrapper.sh

@@ -1294,9 +1294,28 @@ function wipeenv {
     if [ -n "$(cat "$req_file")" ]
     then
         echo "Uninstalling packages:"
-        cat "$req_file"
         echo
-        pip uninstall -y $(cat "$req_file" | grep -v '^-f' | sed 's/>/=/g' | cut -f1 -d=)
+        while read line; do
+            typeset pkg=""
+            if [[ "$line" =~ ^-f ]]; then
+                # ignore lines starting -f which pip sometimes
+                # includes and that do not point to specific
+                # dependencies
+                continue
+            fi
+            if [[ "$line" =~ ^-e ]]; then
+                # fix lines pointing to editable packages, which look like:
+                # -e git+ssh://git@github.com/python-virtualenvwrapper/virtualenvwrapper.git@1dc9e5f52102f0133b804c0c8a6b76c55db908bf#egg=testpackage&subdirectory=tests/testpackage
+                # and parse out the egg name to pass to pip
+                pkg=$(echo "$line" | cut -f2 -d' ' | sed -e 's|&subdirectory.*||g' -e 's|.*egg=||g')
+            else
+                # Strip version specifiers off of the end of the line
+                # to keep only the package name.
+                pkg=$(echo "$line" | sed -e 's/[<>!=].*//g')
+            fi
+            echo $pkg
+            pip uninstall -y "$pkg"
+        done < "$req_file"
     else
         echo "Nothing to remove."
     fi