Updating closure compiler command line for cpp header file generation

Now use a flag file for this invocation of the Closure compiler to avoid
"command line too long" on Windows platforms.

Author: jimevans

rake-tasks/crazy_fun/mappings/javascript.rb

@@ -824,45 +824,54 @@ def handle(fun, dir, args)
         formatting =
             (ENV['pretty_print'] == 'true') ?  "--formatting=PRETTY_PRINT" : ""
 
-        cmd = "java -cp third_party/closure/bin/compiler.jar com.google.javascript.jscomp.CommandLineRunner " <<
-            "--js_output_file=#{output} " <<
-            "--output_wrapper=\"#{wrapper}\" " <<
-            "--compilation_level=#{compilation_level(minify)} " <<
-            "--define=goog.NATIVE_ARRAY_PROTOTYPES=false " <<
-            "--define=bot.json.NATIVE_JSON=false " <<
-            "#{defines} " <<
-            "#{formatting} " <<
-            "--jscomp_off=unknownDefines " <<
-            "--jscomp_off=deprecated " <<
-            "--jscomp_error=accessControls " <<
-            "--jscomp_error=ambiguousFunctionDecl " <<
-            "--jscomp_error=checkDebuggerStatement " <<
-            "--jscomp_error=checkRegExp " <<
-            "--jscomp_error=checkTypes " <<
-            "--jscomp_error=checkVars " <<
-            "--jscomp_error=const " <<
-            "--jscomp_error=constantProperty " <<
-            "--jscomp_error=duplicate " <<
-            "--jscomp_error=duplicateMessage " <<
-            "--jscomp_error=externsValidation " <<
-            "--jscomp_error=fileoverviewTags " <<
-            "--jscomp_error=globalThis " <<
-            "--jscomp_error=internetExplorerChecks " <<
-            "--jscomp_error=invalidCasts " <<
-            "--jscomp_error=missingProperties " <<
-            "--jscomp_error=nonStandardJsDocs " <<
-            "--jscomp_error=strictModuleDepCheck " <<
-            "--jscomp_error=typeInvalidation " <<
-            "--jscomp_error=undefinedNames " <<
-            "--jscomp_error=undefinedVars " <<
-            "--jscomp_error=uselessCode " <<
-            "--jscomp_error=visibility " <<
-            "--js='" <<
-            all_deps.join("' --js='") << "'"
+        flags = []
+        flags.push("--js_output_file=#{output}")
+        flags.push("--output_wrapper=\"#{wrapper}\"")
+        flags.push("--compilation_level=#{compilation_level(minify)}")
+        flags.push("--define=goog.NATIVE_ARRAY_PROTOTYPES=false")
+        flags.push("--define=bot.json.NATIVE_JSON=false")
+        flags.push("#{defines}")
+        flags.push("#{formatting}")
+        flags.push("--jscomp_off=unknownDefines")
+        flags.push("--jscomp_off=deprecated")
+        flags.push("--jscomp_error=accessControls")
+        flags.push("--jscomp_error=ambiguousFunctionDecl")
+        flags.push("--jscomp_error=checkDebuggerStatement")
+        flags.push("--jscomp_error=checkRegExp")
+        flags.push("--jscomp_error=checkTypes")
+        flags.push("--jscomp_error=checkVars")
+        flags.push("--jscomp_error=const")
+        flags.push("--jscomp_error=constantProperty")
+        flags.push("--jscomp_error=duplicate")
+        flags.push("--jscomp_error=duplicateMessage")
+        flags.push("--jscomp_error=externsValidation")
+        flags.push("--jscomp_error=fileoverviewTags")
+        flags.push("--jscomp_error=globalThis")
+        flags.push("--jscomp_error=internetExplorerChecks")
+        flags.push("--jscomp_error=invalidCasts")
+        flags.push("--jscomp_error=missingProperties")
+        flags.push("--jscomp_error=nonStandardJsDocs")
+        flags.push("--jscomp_error=strictModuleDepCheck")
+        flags.push("--jscomp_error=typeInvalidation")
+        flags.push("--jscomp_error=undefinedNames")
+        flags.push("--jscomp_error=undefinedVars")
+        flags.push("--jscomp_error=uselessCode")
+        flags.push("--jscomp_error=visibility")
+
+        expanded_flags = flags.join(" ") <<
+           " --js='" <<
+           all_deps.join("' --js='") << "'"
 
         mkdir_p File.dirname(output)
 
+        flag_file = File.join(File.dirname(output), "closure_flags.txt")
+        File.open(flag_file, 'w') {|f| f.write(expanded_flags)}    
+
+        cmd = "java -cp third_party/closure/bin/compiler.jar com.google.javascript.jscomp.CommandLineRunner " <<
+            "--flagfile " << flag_file
+
         sh cmd
+        rm_rf flag_file
       end
 
       output_task = Rake::Task[output]