zsh: python: add -f flag to mkvenv

- improve mkvenv with getopts option parsing
- add -f flag to force recreation of venv

Usage:
```bash
mkvenv [-sf] [venv_name]
```

functions/python.zsh

@@ -1,25 +1,44 @@
 mkvenv(){
-    local source_venv
-    if [[ $1 == "-s" ]]; then
-        source_venv=y
+    local source_venv force_create venv_name
+    while getopts "sf" opt; do
+        case $opt in
+            s|source) source_venv=y ;;
+            f|force) force_create=y ;;
+            *) echo "Unknown option: $opt"; return 1 ;;
+        esac
+    done
+
+    echo "force=$force_create"
+    return
+    shift $(($OPTIND-1))
+    if [[ -n $1 ]]; then
+        venv_name=$1
         shift
     fi
-    # any arguments are passed on to the `venv` module as flags/arguments
-    if [[ -e .venv ]]; then
-        echo "$(color $RED Error:) $(color $BOLD .venv) already exists." >&2
-        return 1
+    # any other arguments are passed on to the `venv` module as flags/arguments
+    echo ${venv_name}
+    if [[ -e ${venv_name} ]]; then
+        if [[ -n ${force_create} ]]; then
+            if [[ -n $VIRTUAL_ENV ]]; then # deactivate venv if enabled
+                deactivate && info "Deactivated existing virtualenv" || red "Could not run deactivate";
+            fi
+            rm -rf ${venv_name} && info "Deleted existing virtualenv"
+        else
+            echo "$(color $RED Error:) $(color $BOLD .venv) already exists. Run with -f to recreate it." >&2
+            return 1
+        fi
     fi
 
-    echo -n "Creating venv..." && python -m virtualenv $@ .venv || echo -e "Failed to create virtualenv. Is virtualenv installed? Try:\n $ pip install virtualenv"
+    info "Creating virtualenv ${venv_name}... " && python -m virtualenv $@ ${venv_name}|| echo -e "Failed to create virtualenv. Is virtualenv installed? Try:\n $ pip install virtualenv"
     if [[ -z ${source_venv} ]]; then
-        echo -n " done. Enable? [Y/n]"
+        echo -n " done. Enable? [Y/n] "
         read source_venv
     else
         echo ""
     fi
 
     if [[ $source_venv != "n" ]]; then
-        source .venv/bin/activate && echo -e "  → $(color $BOLD Enabled!) 🐍 $(color $BOLD$PURPLE $(python --version | cut -d " " -f2 )) ($(color $BOLD$GREEN $(pip --version | cut -d " " -f -2)))"
+        source ${venv_name}/bin/activate && echo -e "  → $(color $BOLD Enabled!) 🐍 $(color $BOLD$PURPLE $(python --version | cut -d " " -f2 )) ($(color $BOLD$GREEN $(pip --version | cut -d " " -f -2)))"
     fi
 }