Improve rc/ scripts

rc/01-functions.sh

@@ -1,7 +1,7 @@
 # $LWS/rc/functions.sh
 
 function xlog() {
-  if (( $LWS_DEBUG )); then
+  if true_false "$LWS_DEBUG"; then
     echo "$@"
   fi
 }
@@ -33,7 +33,7 @@ function append_path() {
 
 function append_path_try() {
   if [[ -e "$1" ]]; then
-    append_pat "$1"
+    append_path "$1"
   fi
 }
 
@@ -69,13 +69,17 @@ function can_run() {
 function source_directory() {
   local mask="$1"
   for file in $mask; do
-    if [[ -f "$file" ]]; then
+    if [[ -e "$file" ]]; then
       xlog "LOAD $file"
       source "$file"
     fi
   done
 }
 
+function source_directory_sh() {
+  source_directory "$1/*.sh"
+}
+
 # use: dump_args "$@"
 function dump_args() {
   for i in $*; do