Add mkproject --force option

This allows `mkproject` to create a virtualenv for a project
directory that already exists, which is something I frequently
find the need to do.

Author: claymation

tests/test_project_mk.sh

@@ -66,6 +66,8 @@ test_project_exists () {
     mkproject myproject4 >/dev/null 2>&1
     output=`mkproject myproject4 2>&1`
     assertTrue "Did not see expected message 'already exists' in: $output" "echo $output | grep 'already exists'"
+    output=`mkproject -f myproject4 2>&1`
+    assertFalse "Saw unexpected message 'already exists' in: $output" "echo $output | grep 'already exists'"
 }
 
 test_same_workon_and_project_home () {

virtualenvwrapper.sh

@@ -974,7 +974,10 @@ function setvirtualenvproject {
 
 # Show help for mkproject
 function virtualenvwrapper_mkproject_help {
-    echo "Usage: mkproject [-t template] [virtualenv options] project_name"
+    echo "Usage: mkproject [-f|--force] [-t template] [virtualenv options] project_name"
+    echo
+    echo "-f, --force    Create the project even if the project directory"
+    echo "               already exists"
     echo
     echo "Multiple templates may be selected.  They are applied in the order"
     echo "specified on the command line."
@@ -996,9 +999,11 @@ function mkproject {
     typeset tst
     typeset a
     typeset t
+    typeset force
     typeset templates
 
     in_args=( "$@" )
+    force=0
 
     if [ -n "$ZSH_VERSION" ]
     then
@@ -1015,6 +1020,8 @@ function mkproject {
             -h|--help)
                 virtualenvwrapper_mkproject_help;
                 return;;
+            -f|--force)
+                force=1;;
             -t)
                 i=$(( $i + 1 ));
                 templates="$templates ${in_args[$i]}";;
@@ -1038,7 +1045,7 @@ function mkproject {
     eval "typeset envname=\$$#"
     virtualenvwrapper_verify_project_home || return 1
 
-    if [ -d "$PROJECT_HOME/$envname" ]
+    if [ -d "$PROJECT_HOME/$envname" -a $force -eq 0 ]
     then
         echo "Project $envname already exists." >&2
         return 1