feat(msgpack): convert Blobs to BIN strings

runtime/doc/eval.txt

@@ -6692,7 +6692,7 @@ msgpackdump({list})					*msgpackdump()*
 		1. |Funcref|s cannot be dumped.
 		2. Containers that reference themselves cannot be dumped.
 		3. Dictionary keys are always dumped as STR strings.
-		4. Other strings are always dumped as BIN strings.
+		4. Other strings and |Blob|s are always dumped as BIN strings.
 		5. Points 3. and 4. do not apply to |msgpack-special-dict|s.
 
 msgpackparse({list})					*msgpackparse()*
@@ -6706,7 +6706,7 @@ msgpackparse({list})					*msgpackparse()*
 
 		Limitations:
 		1. Mapping ordering is not preserved unless messagepack
-		   mapping is dumped using generic  mapping
+		   mapping is dumped using generic mapping
 		   (|msgpack-special-map|).
 		2. Since the parser aims to preserve all data untouched
 		   (except for 1.) some strings are parsed to

src/nvim/eval/encode.c

@@ -950,7 +950,13 @@ char *encode_tv2json(typval_T *tv, size_t *len)
     } while (0)
 
 #define TYPVAL_ENCODE_CONV_BLOB(tv, blob, len) \
-    abort() /* TODO(seandewar) */ \
+    do { \
+      const size_t len_ = (size_t)(len); \
+      msgpack_pack_bin(packer, len_); \
+      if (len_ > 0) { \
+        msgpack_pack_bin_body(packer, (blob)->bv_ga.ga_data, len_); \
+      } \
+    } while (0)
 
 #define TYPVAL_ENCODE_CONV_NUMBER(tv, num) \
     msgpack_pack_int64(packer, (int64_t)(num))

test/functional/eval/msgpack_functions_spec.lua

@@ -517,6 +517,10 @@ describe('msgpackdump() function', function()
     eq({"\196\004Test"}, eval('msgpackdump(obj)'))
   end)
 
+  it('dumps blob as BIN 8', function()
+    eq({'\196\005Bl\nb!'}, eval('msgpackdump([0z426c006221])'))
+  end)
+
   it('can dump generic mapping with generic mapping keys and values', function()
     command('let todump = {"_TYPE": v:msgpack_types.map, "_VAL": []}')
     command('let todumpv1 = {"_TYPE": v:msgpack_types.map, "_VAL": []}')
@@ -716,6 +720,10 @@ describe('msgpackdump() function', function()
     eq({'\160'}, eval('msgpackdump([{"_TYPE": v:msgpack_types.string, "_VAL": [$XXX_UNEXISTENT_VAR_XXX]}])'))
   end)
 
+  it('can dump NULL blob', function()
+    eq({'\196\n'}, eval('msgpackdump([v:_null_blob])'))
+  end)
+
   it('can dump NULL list', function()
     eq({'\144'}, eval('msgpackdump([v:_null_list])'))
   end)