[examples] rearrange; add hello_world.mdesk example file

bin/build_examples.sh

@@ -9,9 +9,11 @@ cd ..
 echo "~~~ Build All Exampes ~~~"
 bin/bld_core.sh show_ctx
 
-bin/bld_core.sh unit datadesk_like examples/datadesk_like_template.c
+metasrc="examples/metaprograms"
-bin/bld_core.sh unit node_errors   examples/node_errors/node_errors.c
+
-bin/bld_core.sh unit parse_check   examples/parse_check.c
+bin/bld_core.sh unit datadesk_like $metasrc/datadesk_like_template.c
+bin/bld_core.sh unit node_errors   $metasrc/node_errors.c
+bin/bld_core.sh unit parse_check   $metasrc/parse_check.c
 
 echo
 

examples/mdesk_files/hello_world.mdesk

@@ -0,0 +1,22 @@
+/* the hello world file */
+
+hello world!
+"hello world!"
+
+// sets
+(hello world!)
+[hello world!]
+{hello world!}
+
+// sets with labels
+hello: world!
+hello: (world!)
+
+// tags
+@exclaim "hello world"
+@message
+{
+ @recipient world
+ @contents  hello
+ @punctuate !
+}

examples/metaprograms/parse_check.c

@@ -66,7 +66,7 @@ int main(int argument_count, char **arguments)
         //  can easily check the severity of a entire parse by looking at the
         //  `max_message_kind` field on the errors from the parse result. Here
         //  only push the parse result onto our list if there were no errors.
-        if (parse_result.errors.max_message_kind >= MD_MessageKind_Error)
+        if (parse_result.errors.max_message_kind < MD_MessageKind_Error)
         {
             MD_PushNewReference(arena, list, parse_result.node);
         }

intro_notes.txt

@@ -18,7 +18,9 @@ Example Programs:
 [ ] Example multi-threaded parsing
 
 Example Metadesk Files:
-[ ] Hello world
+[x] Hello world
+[ ] identifiers, numbers, strings, and symbols
+[ ] sets, seperators, labels, and tags
 
 
 Allen's Final Tweak Notes (September 10th 2021):