nuxfs: Added support for custom / folder specific DSL

Signed-off-by: Tony Tkacik <tonydamage@gmail.com>

inc/dsl/nuxfs.dsl

@@ -0,0 +1,35 @@
+.block dir name
+.keyword link name target
+.keyword git name origin
+.keyword origin
+.keyword name name
+.keyword template
+.keyword exists
+
+directory() {
+  dir
+}
+
+sdir() {
+  dir "$@"
+  enddir
+}
+
+.allways.preprocess() {
+  abs_path=$(realpath -Lms "$NUXFS_DEF_DIR/$path");
+  rel_path=$(realpath -Lms "$abs_path" --relative-base="$WORKDIR");
+}
+
+.check() {
+  nux.log trace "Checking existence of $NC_White$abs_path$NC_No"
+  nux.check.file.exists "$abs_path"
+}
+
+.check.failed() {
+  nux.dsl.error "$abs_path" does not exists.
+}
+dir.entered() {
+  if nux.check.file.exists "$abs_path/.nuxfs"; then
+    source "$abs_path/.nuxfs"
+  fi
+}