#50 use UTF-8 in start-process; test against a txt file generated by PlantUML instead of a hand-made one

plantuml-mode.el

@@ -222,7 +222,7 @@ default output type for new buffers."
                   plantuml-java-command
                   ,@plantuml-java-args
                   (expand-file-name plantuml-jar-path)
-                  (plantuml-output-type-opt) "-p"))
+                  (plantuml-output-type-opt) "-charset" "UTF-8" "-p"))
 
 (defun plantuml-preview-string (prefix string)
   "Preview diagram from PlantUML sources (as STRING), using prefix (as PREFIX)

test/resources/unicode.txt

@@ -1,8 +1,9 @@
-     ┌────┐          ┌──────┐
+     ┌────┐          ┌───┐
      │lang│          │日本語│
-     └──┬─┘          └───┬──┘
+     └─┬──┘          └─┬─┘
-        │                │ 
+       │               │
-        │────────-----──>│ 
+       │ ─────────────>│
-     ┌──┴─┐          ┌───┴──┐
+     ┌─┴──┐          ┌─┴─┐
      │lang│          │日本語│
-     └────┘          └──────┘
+     └────┘          └───┘
+