Add RunScript command with Edit > Scripts menu

data/gui.xml

@@ -535,6 +535,11 @@
           <separator />
           <item command="Despeckle" text="&amp;Despeckle (median filter)" />
         </menu>
+        <menu text="Scripts">
+          <item command="RunScript" text="Transparency from White Background">
+            <param name="filename" value="white_to_alpha.js" />
+          </item>
+        </menu>
         <separator />
         <item command="KeyboardShortcuts" text="&amp;Keyboard Shortcuts..." />
         <item command="Options" text="Pre&amp;ferences..." />

data/scripts/white_to_alpha.js

@@ -0,0 +1,15 @@
+// Aseprite
+// Copyright (C) 2015 by David Capello
+
+var spr = activeSprite
+
+for (y=0; y<spr.height; ++y) {
+  for (x=0; x<spr.width; ++x) {
+    var c = spr.getPixel(x, y)
+    var v = (rgbaR(c)+rgbaG(c)+rgbaB(c))/3
+    spr.putPixel(x, y, rgba(rgbaR(c),
+                            rgbaG(c),
+                            rgbaB(c),
+                            255-v))
+  }
+}

src/app/CMakeLists.txt

@@ -218,6 +218,7 @@ add_library(app-lib
   commands/cmd_reselect_mask.cpp
   commands/cmd_reverse_frames.cpp
   commands/cmd_rotate.cpp
+  commands/cmd_run_script.cpp
   commands/cmd_save_file.cpp
   commands/cmd_save_mask.cpp
   commands/cmd_save_palette.cpp

src/app/commands/cmd_run_script.cpp

@@ -0,0 +1,80 @@
+// Aseprite
+// Copyright (C) 2001-2015  David Capello
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation.
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "app/commands/command.h"
+#include "app/commands/params.h"
+#include "app/console.h"
+#include "app/resource_finder.h"
+#include "app/scripting/app_scripting.h"
+#include "base/path.h"
+#include "scripting/engine_delegate.h"
+#include "ui/manager.h"
+
+#include <cstdio>
+
+namespace app {
+
+class ConsoleEngineDelegate : public scripting::EngineDelegate {
+public:
+  void onConsolePrint(const char* text) override {
+    m_console.printf("%s\n", text);
+  }
+
+private:
+  Console m_console;
+};
+
+class RunScriptCommand : public Command {
+public:
+  RunScriptCommand();
+  Command* clone() const override { return new RunScriptCommand(*this); }
+
+protected:
+  void onLoadParams(const Params& params) override;
+  void onExecute(Context* context) override;
+
+private:
+  std::string m_filename;
+};
+
+RunScriptCommand::RunScriptCommand()
+  : Command("RunScript",
+            "Run Script",
+            CmdRecordableFlag)
+{
+}
+
+void RunScriptCommand::onLoadParams(const Params& params)
+{
+  m_filename = params.get("filename");
+  if (base::get_file_path(m_filename).empty()) {
+    ResourceFinder rf;
+    rf.includeDataDir(base::join_path("scripts", m_filename).c_str());
+    if (rf.findFirst())
+      m_filename = rf.filename();
+  }
+}
+
+void RunScriptCommand::onExecute(Context* context)
+{
+  ConsoleEngineDelegate delegate;
+  AppScripting engine(&delegate);
+  engine.evalFile(m_filename);
+
+  ui::Manager::getDefault()->invalidate();
+}
+
+Command* CommandFactory::createRunScriptCommand()
+{
+  return new RunScriptCommand;
+}
+
+} // namespace app

src/app/commands/commands_list.h

@@ -94,6 +94,7 @@ FOR_EACH_COMMAND(ReplaceColor)
 FOR_EACH_COMMAND(ReselectMask)
 FOR_EACH_COMMAND(ReverseFrames)
 FOR_EACH_COMMAND(Rotate)
+FOR_EACH_COMMAND(RunScript)
 FOR_EACH_COMMAND(SaveFile)
 FOR_EACH_COMMAND(SaveFileAs)
 FOR_EACH_COMMAND(SaveFileCopyAs)

src/scripting/engine.cpp

@@ -221,7 +221,10 @@ void Engine::eval(const std::string& jsCode)
     ContextHandle handle = m_ctx.handle();
 
     duk_eval_string(handle, jsCode.c_str());
-    m_delegate->onConsolePrint(duk_safe_to_string(handle, -1));
+
+    if (!duk_is_null_or_undefined(handle, -1))
+      m_delegate->onConsolePrint(duk_safe_to_string(handle, -1));
+
     duk_pop(handle);
   }
   catch (const std::exception& ex) {
@@ -258,7 +261,10 @@ void Engine::evalFile(const std::string& file)
 
     duk_push_string(handle, duk_to_string(handle, -1));
     duk_eval_raw(handle, nullptr, 0, DUK_COMPILE_EVAL);
-    m_delegate->onConsolePrint(duk_safe_to_string(handle, -1));
+
+    if (!duk_is_null_or_undefined(handle, -1))
+      m_delegate->onConsolePrint(duk_safe_to_string(handle, -1));
+
     duk_pop(handle);
 
   fail: