plantuml: fix non-/usr/local installations. (#1464)

* plantuml 8041

* plantuml: use the homebrew version of graphviz installed as dependency

This fixes plantuml when homebrew prefix is not `/usr/local`.

Formula/plantuml.rb

@@ -1,8 +1,8 @@
 class Plantuml < Formula
   desc "Draw UML diagrams"
   homepage "http://plantuml.sourceforge.net/"
-  url "https://downloads.sourceforge.net/project/plantuml/plantuml.8039.jar"
-  sha256 "a82d120fbb5109b6187f53bb8f9c479706ba305352e7bcaaecef5d2b3fed0470"
+  url "https://downloads.sourceforge.net/project/plantuml/plantuml.8041.jar"
+  sha256 "8964b8ea316e37492d9a4533a57338c46f629cdd920d48ddae53e2b62f5b6c8d"
 
   bottle :unneeded
 
@@ -11,7 +11,10 @@ class Plantuml < Formula
   def install
     jar = "plantuml.#{version}.jar"
     prefix.install jar
-    bin.write_jar_script prefix/jar, "plantuml"
+    (bin+"plantuml").write <<-EOS.undent
+      #!/bin/bash
+      GRAPHVIZ_DOT="#{Formula["graphviz"].opt_bin}/dot" exec java -jar #{prefix}/#{jar} "$@"
+    EOS
   end
 
   test do