pff: support ---clean-switch

pff

@@ -1505,10 +1505,17 @@ function list_profiles_cmd() {
 # pff --switch
 
 function switch_cmd() {
+    local clean=
+    if [ "$1" == --clean ]; then
+        shift
+        clean=1
+    fi
     local profile="$1" pffdir="$2"
     local -a profiles
 
     ensure_pffdir pffdir "$pffdir"
+    [ -n "$clean" ] && rm -rf "$pffdir/pff/Current"
+
     autoinit "$pffdir"
     [ -n "$profile" ] || setx profile=get_first_profile "$pffdir"
 
@@ -1842,6 +1849,7 @@ merge_strategy=
 commit_policy=ask
 profile=
 alternate=
+clean_switch=
 args=($parse_mode
     --help '$exit_with display_help'
     -0,--init action=init
@@ -1867,6 +1875,7 @@ args=($parse_mode
     --locals action=list-locals
     --profiles action=list-profiles
     -s,--switch action=switch
+    --sk,--clean-switch clean_switch=1
     -a,--add-local action=add-local
     -e,--edit action=edit
     -p:,--profile: profile=
@@ -1888,7 +1897,7 @@ patch) patch_cmd "$merge_strategy" "$commit_policy" "$@";;
 add-global) add_global_cmd "$@";;
 list-locals) list_locals_cmd "$@";;
 list-profiles) list_profiles_cmd "$@";;
-switch) switch_cmd "$@";;
+switch) switch_cmd ${clean_switch:+--clean} "$@";;
 add-local) add_local_cmd "$@";;
 edit) edit_cmd "$profile" "$@";;
 diff) diff_cmd "$alternate" "$@";;