_filedir: Avoid some unnecessary work with -d

bash_completion

@@ -560,38 +560,38 @@ _quote_readline_by_ref()
 #
 _filedir()
 {
-    local IFS=$'\n' xspec
+    local IFS=$'\n'
 
     _tilde "$cur" || return 0
 
     local -a toks
-    local quoted x tmp
+    local x tmp
 
-    _quote_readline_by_ref "$cur" quoted
     x=$( compgen -d -- "$cur" ) &&
     while read -r tmp; do
         toks+=( "$tmp" )
     done <<< "$x"
 
     if [[ "$1" != -d ]]; then
+        local quoted
+        _quote_readline_by_ref "$cur" quoted
+
         # Munge xspec to contain uppercase version too
         # http://thread.gmane.org/gmane.comp.shells.bash.bugs/15294/focus=15306
-        xspec=${1:+"!*.@($1|${1^^})"}
+        local xspec=${1:+"!*.@($1|${1^^})"}
         x=$( compgen -f -X "$xspec" -- $quoted ) &&
         while read -r tmp; do
             toks+=( "$tmp" )
         done <<< "$x"
+
+        # Try without filter if it failed to produce anything and configured to
+        [[ -n ${COMP_FILEDIR_FALLBACK:-} && -n "$1" && ${#toks[@]} -lt 1 ]] && \
+            x=$( compgen -f -- $quoted ) &&
+            while read -r tmp; do
+                toks+=( "$tmp" )
+            done <<< "$x"
     fi
 
-    # If the filter failed to produce anything, try without it if configured to
-    [[ -n ${COMP_FILEDIR_FALLBACK:-} && \
-        -n "$1" && "$1" != -d && ${#toks[@]} -lt 1 ]] && \
-        x=$( compgen -f -- $quoted ) &&
-        while read -r tmp; do
-            toks+=( "$tmp" )
-        done <<< "$x"
-
-
     if [[ ${#toks[@]} -ne 0 ]]; then
         # 2>/dev/null for direct invocation, e.g. in the _filedir unit test
         compopt -o filenames 2>/dev/null