gtk2_ardour/luainstance.cc

   1 /*
   2  * Copyright (C) 2016 Robin Gareus <robin@gareus.org>
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  */
  18
  19 #include <cairomm/context.h>
  20 #include <cairomm/surface.h>
  21 #include <pango/pangocairo.h>
  22
  23 #include "gtkmm2ext/gui_thread.h"
  24
  25 #include "ardour/audioengine.h"
  26 #include "ardour/diskstream.h"
  27 #include "ardour/plugin_manager.h"
  28 #include "ardour/route.h"
  29 #include "ardour/session.h"
  30
  31 #include "LuaBridge/LuaBridge.h"
  32
  33 #include "ardour_http.h"
  34 #include "ardour_ui.h"
  35 #include "public_editor.h"
  36 #include "region_selection.h"
  37 #include "luainstance.h"
  38 #include "luasignal.h"
  39 #include "marker.h"
  40 #include "processor_box.h"
  41 #include "time_axis_view.h"
  42 #include "selection.h"
  43 #include "script_selector.h"
  44 #include "timers.h"
  45 #include "utils_videotl.h"
  46
  47 #include "pbd/i18n.h"
  48
  49 namespace LuaCairo {
  50 /** wrap RefPtr< Cairo::ImageSurface >
  51  *
  52  * Image surfaces provide the ability to render to memory buffers either
  53  * allocated by cairo or by the calling code. The supported image formats are
  54  * those defined in Cairo::Format.
  55  */
  56 class ImageSurface {
  57         public:
  58                 /**
  59                  * Creates an image surface of the specified format and dimensions. Initially
  60                  * the surface contents are all 0. (Specifically, within each pixel, each
  61                  * color or alpha channel belonging to format will be 0. The contents of bits
  62                  * within a pixel, but not belonging to the given format are undefined).
  63                  *
  64                  * @param format        format of pixels in the surface to create
  65                  * @param width         width of the surface, in pixels
  66                  * @param height        height of the surface, in pixels
  67                  */
  68                 ImageSurface (Cairo::Format format, int width, int height)
  69                         : _surface (Cairo::ImageSurface::create (format, width, height))
  70                         , _ctx (Cairo::Context::create (_surface))
  71                         , ctx (_ctx->cobj ()) {}
  72
  73                 ~ImageSurface () {}
  74
  75                 /**
  76                  * Set this surface as source for another context.
  77                  * This allows to draw this surface
  78                  */
  79                 void set_as_source (Cairo::Context* c, int x, int y) {
  80                         _surface->flush ();
  81                         c->set_source (_surface, x, y);
  82                 }
  83
  84                 /**
  85                  * Returns a context object to perform operations on the surface
  86                  */
  87                 Cairo::Context* context () {
  88                         return (Cairo::Context *)&ctx;
  89                 }
  90
  91                 /**
  92                  * Returns the stride of the image surface in bytes (or 0 if surface is not
  93                  * an image surface). The stride is the distance in bytes from the beginning
  94                  * of one row of the image data to the beginning of the next row.
  95                  */
  96                 int get_stride () const {
  97                         return _surface->get_stride ();
  98                 }
  99
 100                 /** Gets the width of the ImageSurface in pixels */
 101                 int get_width () const {
 102                         return _surface->get_width ();
 103                 }
 104
 105                 /** Gets the height of the ImageSurface in pixels */
 106                 int get_height () const {
 107                         return _surface->get_height ();
 108                 }
 109
 110                 /**
 111                  * Get a pointer to the data of the image surface, for direct
 112                  * inspection or modification.
 113                  *
 114                  * Return value: a pointer to the image data of this surface or NULL
 115                  * if @surface is not an image surface.
 116                  *
 117                  */
 118                 unsigned char* get_data () {
 119                         return _surface->get_data ();
 120                 }
 121
 122                 /** Tells cairo to consider the data buffer dirty.
 123                  *
 124                  * In particular, if you've created an ImageSurface with a data buffer that
 125                  * you've allocated yourself and you draw to that data buffer using means
 126                  * other than cairo, you must call mark_dirty() before doing any additional
 127                  * drawing to that surface with cairo.
 128                  *
 129                  * Note that if you do draw to the Surface outside of cairo, you must call
 130                  * flush() before doing the drawing.
 131                  */
 132                 void mark_dirty () {
 133                         _surface->mark_dirty ();
 134                 }
 135
 136                 /** Marks a rectangular area of the given surface dirty.
 137                  *
 138                  * @param x      X coordinate of dirty rectangle
 139                  * @param y     Y coordinate of dirty rectangle
 140                  * @param width         width of dirty rectangle
 141                  * @param height        height of dirty rectangle
 142                  */
 143                 void mark_dirty (int x, int y, int width, int height) {
 144                         _surface->mark_dirty (x, y, width, height);
 145                 }
 146
 147         private:
 148                 Cairo::RefPtr<Cairo::ImageSurface> _surface;
 149                 Cairo::RefPtr<Cairo::Context> _ctx;
 150                 Cairo::Context ctx;
 151 };
 152
 153 class PangoLayout {
 154         public:
 155                 /** Create a new PangoLayout Text Display
 156                  * @param c CairoContext for the layout
 157                  * @param font_name a font-description e.g. "Mono 8px"
 158                  */
 159                 PangoLayout (Cairo::Context* c, std::string font_name) {
 160                         ::PangoLayout* pl = pango_cairo_create_layout (c->cobj ());
 161                         _layout = Glib::wrap (pl);
 162                         Pango::FontDescription fd (font_name);
 163                         _layout->set_font_description (fd);
 164                 }
 165
 166                 ~PangoLayout () {}
 167
 168                 /** Gets the text in the layout. The returned text should not
 169                  * be freed or modified.
 170                  *
 171                  * @return The text in the @a layout.
 172                  */
 173                 std::string get_text () const {
 174                         return _layout->get_text ();
 175                 }
 176                 /** Set the text of the layout.
 177                  * @param text The text for the layout.
 178                  */
 179                 void set_text (const std::string& text) {
 180                         _layout->set_text (text);
 181                 }
 182
 183                 /** Sets the layout text and attribute list from marked-up text (see markup format).
 184                  * Replaces the current text and attribute list.
 185                  * @param markup Some marked-up text.
 186                  */
 187                 void set_markup (const std::string& markup) {
 188                         _layout->set_markup (markup);
 189                 }
 190
 191                 /** Sets the width to which the lines of the Pango::Layout should wrap or
 192                  * ellipsized.  The default value is -1: no width set.
 193                  *
 194                  * @param width The desired width in Pango units, or -1 to indicate that no
 195                  * wrapping or ellipsization should be performed.
 196                  */
 197                 void set_width (int width) {
 198                         _layout->set_width (width * PANGO_SCALE);
 199                 }
 200
 201                 /** Gets the width to which the lines of the Pango::Layout should wrap.
 202                  *
 203                  * @return The width in Pango units, or -1 if no width set.
 204                  */
 205                 int get_width () const {
 206                         return _layout->get_width () / PANGO_SCALE;
 207                 }
 208
 209                 /** Sets the type of ellipsization being performed for @a layout.
 210                  * Depending on the ellipsization mode @a ellipsize text is
 211                  * removed from the start, middle, or end of text so they
 212                  * fit within the width and height of layout set with
 213                  * set_width() and set_height().
 214                  *
 215                  * If the layout contains characters such as newlines that
 216                  * force it to be layed out in multiple paragraphs, then whether
 217                  * each paragraph is ellipsized separately or the entire layout
 218                  * is ellipsized as a whole depends on the set height of the layout.
 219                  * See set_height() for details.
 220                  *
 221                  * @param ellipsize The new ellipsization mode for @a layout.
 222                  */
 223                 void set_ellipsize (Pango::EllipsizeMode ellipsize) {
 224                         _layout->set_ellipsize (ellipsize);
 225                 }
 226
 227                 /** Gets the type of ellipsization being performed for @a layout.
 228                  * See set_ellipsize()
 229                  *
 230                  * @return The current ellipsization mode for @a layout.
 231                  *
 232                  * Use is_ellipsized() to query whether any paragraphs
 233                  * were actually ellipsized.
 234                  */
 235                 Pango::EllipsizeMode get_ellipsize () const {
 236                         return _layout->get_ellipsize ();
 237                 }
 238
 239                 /** Queries whether the layout had to ellipsize any paragraphs.
 240                  *
 241                  * This returns <tt>true</tt> if the ellipsization mode for @a layout
 242                  * is not Pango::ELLIPSIZE_NONE, a positive width is set on @a layout,
 243                  * and there are paragraphs exceeding that width that have to be
 244                  * ellipsized.
 245                  *
 246                  * @return <tt>true</tt> if any paragraphs had to be ellipsized, <tt>false</tt>
 247                  * otherwise.
 248                  */
 249                 bool is_ellipsized () const {
 250                         return _layout->is_ellipsized ();
 251                 }
 252
 253                 /** Sets the wrap mode; the wrap mode only has effect if a width
 254                  * is set on the layout with set_width().
 255                  * To turn off wrapping, set the width to -1.
 256                  *
 257                  * @param wrap The wrap mode.
 258                  */
 259                 void set_wrap (Pango::WrapMode wrap) {
 260                         _layout->set_width (wrap);
 261                 }
 262
 263                 /** Gets the wrap mode for the layout.
 264                  *
 265                  * Use is_wrapped() to query whether any paragraphs
 266                  * were actually wrapped.
 267                  *
 268                  * @return Active wrap mode.
 269                  */
 270                 Pango::WrapMode get_wrap () const {
 271                         return _layout->get_wrap ();
 272                 }
 273
 274                 /** Queries whether the layout had to wrap any paragraphs.
 275                  *
 276                  * This returns <tt>true</tt> if a positive width is set on @a layout,
 277                  * ellipsization mode of @a layout is set to Pango::ELLIPSIZE_NONE,
 278                  * and there are paragraphs exceeding the layout width that have
 279                  * to be wrapped.
 280                  *
 281                  * @return <tt>true</tt> if any paragraphs had to be wrapped, <tt>false</tt>
 282                  * otherwise.
 283                  */
 284                 bool is_wrapped () const {
 285                         return _layout->is_wrapped ();
 286                 }
 287
 288                 /** Determines the logical width and height of a Pango::Layout
 289                  * in device units.
 290                  */
 291                 int get_pixel_size (lua_State *L) {
 292                         int width, height;
 293                         _layout->get_pixel_size (width, height);
 294                         luabridge::Stack<int>::push (L, width);
 295                         luabridge::Stack<int>::push (L, height);
 296                         return 2;
 297                 }
 298
 299
 300                 /** Draws a Layout in the specified Cairo @a context. The top-left
 301                  *  corner of the Layout will be drawn at the current point of the
 302                  *  cairo context.
 303                  *
 304                  * @param context A Cairo context.
 305                  */
 306                 void show_in_cairo_context (Cairo::Context* c) {
 307                         pango_cairo_update_layout (c->cobj (), _layout->gobj());
 308                         pango_cairo_show_layout (c->cobj (), _layout->gobj());
 309                 }
 310
 311         private:
 312                 Glib::RefPtr<Pango::Layout> _layout;
 313 };
 314
 315 }; // namespace
 316
 317 ////////////////////////////////////////////////////////////////////////////////
 318
 319 namespace LuaSignal {
 320
 321 #define STATIC(name,c,p) else if (!strcmp(type, #name)) {return name;}
 322 #define SESSION(name,c,p) else if (!strcmp(type, #name)) {return name;}
 323 #define ENGINE(name,c,p) else if (!strcmp(type, #name)) {return name;}
 324
 325 LuaSignal
 326 str2luasignal (const std::string &str) {
 327         const char* type = str.c_str();
 328         if (0) { }
 329 #       include "luasignal_syms.h"
 330         else {
 331                 PBD::fatal << string_compose (_("programming error: %1: %2"), "Impossible LuaSignal type", str) << endmsg;
 332                 abort(); /*NOTREACHED*/
 333         }
 334 }
 335 #undef STATIC
 336 #undef SESSION
 337 #undef ENGINE
 338
 339 #define STATIC(name,c,p) N_(#name),
 340 #define SESSION(name,c,p) N_(#name),
 341 #define ENGINE(name,c,p) N_(#name),
 342 const char *luasignalstr[] = {
 343 #       include "luasignal_syms.h"
 344         0
 345 };
 346
 347 #undef STATIC
 348 #undef SESSION
 349 #undef ENGINE
 350 }; // namespace
 351
 352
 353 /** special cases for Ardour's Mixer UI */
 354 namespace LuaMixer {
 355
 356         ProcessorBox::ProcSelection
 357         processor_selection () {
 358                 return ProcessorBox::current_processor_selection ();
 359         }
 360
 361 };
 362
 363 ////////////////////////////////////////////////////////////////////////////////
 364
 365 #define xstr(s) stringify(s)
 366 #define stringify(s) #s
 367
 368 using namespace ARDOUR;
 369
 370 PBD::Signal0<void> LuaInstance::LuaTimerDS;
 371
 372 void
 373 LuaInstance::register_hooks (lua_State* L)
 374 {
 375
 376 #define ENGINE(name,c,p) .addConst (stringify(name), (LuaSignal::LuaSignal)LuaSignal::name)
 377 #define STATIC(name,c,p) .addConst (stringify(name), (LuaSignal::LuaSignal)LuaSignal::name)
 378 #define SESSION(name,c,p) .addConst (stringify(name), (LuaSignal::LuaSignal)LuaSignal::name)
 379         luabridge::getGlobalNamespace (L)
 380                 .beginNamespace ("LuaSignal")
 381 #               include "luasignal_syms.h"
 382                 .endNamespace ();
 383 #undef ENGINE
 384 #undef SESSION
 385 #undef STATIC
 386
 387         luabridge::getGlobalNamespace (L)
 388                 .beginNamespace ("LuaSignal")
 389                 .beginStdBitSet <LuaSignal::LAST_SIGNAL> ("Set")
 390                 .endClass()
 391                 .endNamespace ();
 392 }
 393
 394 void
 395 LuaInstance::bind_cairo (lua_State* L)
 396 {
 397         /* std::vector<double> for set_dash()
 398          * for Windows (DLL, .exe) this needs to be bound in the same memory context as "Cairo".
 399          *
 400          * The std::vector<> argument in set_dash() has a fixed address in ardour.exe, while
 401          * the address of the one in libardour.dll is mapped when loading the .dll
 402          *
 403          * see LuaBindings::set_session() for a detailed explanation
 404          */
 405         luabridge::getGlobalNamespace (L)
 406                 .beginNamespace ("C")
 407                 .beginStdVector <double> ("DoubleVector")
 408                 .endClass ()
 409                 .endNamespace ();
 410
 411         luabridge::getGlobalNamespace (L)
 412                 .beginNamespace ("Cairo")
 413                 .beginClass <Cairo::Context> ("Context")
 414                 .addFunction ("save", &Cairo::Context::save)
 415                 .addFunction ("restore", &Cairo::Context::restore)
 416                 .addFunction ("set_operator", &Cairo::Context::set_operator)
 417                 //.addFunction ("set_source", &Cairo::Context::set_operator) // needs RefPtr
 418                 .addFunction ("set_source_rgb", &Cairo::Context::set_source_rgb)
 419                 .addFunction ("set_source_rgba", &Cairo::Context::set_source_rgba)
 420                 .addFunction ("set_line_width", &Cairo::Context::set_line_width)
 421                 .addFunction ("set_line_cap", &Cairo::Context::set_line_cap)
 422                 .addFunction ("set_line_join", &Cairo::Context::set_line_join)
 423                 .addFunction ("set_dash", (void (Cairo::Context::*)(const std::vector<double>&, double))&Cairo::Context::set_dash)
 424                 .addFunction ("unset_dash", &Cairo::Context::unset_dash)
 425                 .addFunction ("translate", &Cairo::Context::translate)
 426                 .addFunction ("scale", &Cairo::Context::scale)
 427                 .addFunction ("rotate", &Cairo::Context::rotate)
 428                 .addFunction ("begin_new_path", &Cairo::Context::begin_new_path)
 429                 .addFunction ("begin_new_sub_path", &Cairo::Context::begin_new_sub_path)
 430                 .addFunction ("move_to", &Cairo::Context::move_to)
 431                 .addFunction ("line_to", &Cairo::Context::line_to)
 432                 .addFunction ("curve_to", &Cairo::Context::curve_to)
 433                 .addFunction ("arc", &Cairo::Context::arc)
 434                 .addFunction ("arc_negative", &Cairo::Context::arc_negative)
 435                 .addFunction ("rel_move_to", &Cairo::Context::rel_move_to)
 436                 .addFunction ("rel_line_to", &Cairo::Context::rel_line_to)
 437                 .addFunction ("rel_curve_to", &Cairo::Context::rel_curve_to)
 438                 .addFunction ("rectangle", (void (Cairo::Context::*)(double, double, double, double))&Cairo::Context::rectangle)
 439                 .addFunction ("close_path", &Cairo::Context::close_path)
 440                 .addFunction ("paint", &Cairo::Context::paint)
 441                 .addFunction ("paint_with_alpha", &Cairo::Context::paint_with_alpha)
 442                 .addFunction ("stroke", &Cairo::Context::stroke)
 443                 .addFunction ("stroke_preserve", &Cairo::Context::stroke_preserve)
 444                 .addFunction ("fill", &Cairo::Context::fill)
 445                 .addFunction ("fill_preserve", &Cairo::Context::fill_preserve)
 446                 .addFunction ("reset_clip", &Cairo::Context::reset_clip)
 447                 .addFunction ("clip", &Cairo::Context::clip)
 448                 .addFunction ("clip_preserve", &Cairo::Context::clip_preserve)
 449                 .addFunction ("set_font_size", &Cairo::Context::set_font_size)
 450                 .addFunction ("show_text", &Cairo::Context::show_text)
 451                 .endClass ()
 452                 /* enums */
 453                 // LineCap, LineJoin, Operator
 454                 .beginNamespace ("LineCap")
 455                 .addConst ("Butt", CAIRO_LINE_CAP_BUTT)
 456                 .addConst ("Round", CAIRO_LINE_CAP_ROUND)
 457                 .addConst ("Square", CAIRO_LINE_CAP_SQUARE)
 458                 .endNamespace ()
 459
 460                 .beginNamespace ("LineJoin")
 461                 .addConst ("Miter", CAIRO_LINE_JOIN_MITER)
 462                 .addConst ("Round", CAIRO_LINE_JOIN_ROUND)
 463                 .addConst ("Bevel", CAIRO_LINE_JOIN_BEVEL)
 464                 .endNamespace ()
 465
 466                 .beginNamespace ("Operator")
 467                 .addConst ("Clear", CAIRO_OPERATOR_CLEAR)
 468                 .addConst ("Source", CAIRO_OPERATOR_SOURCE)
 469                 .addConst ("Over", CAIRO_OPERATOR_OVER)
 470                 .addConst ("Add", CAIRO_OPERATOR_ADD)
 471                 .endNamespace ()
 472
 473                 .beginNamespace ("Format")
 474                 .addConst ("ARGB32", CAIRO_FORMAT_ARGB32)
 475                 .addConst ("RGB24", CAIRO_FORMAT_RGB24)
 476                 .endNamespace ()
 477
 478                 .beginClass <LuaCairo::ImageSurface> ("ImageSurface")
 479                 .addConstructor <void (*) (Cairo::Format, int, int)> ()
 480                 .addFunction ("set_as_source", &LuaCairo::ImageSurface::set_as_source)
 481                 .addFunction ("context", &LuaCairo::ImageSurface::context)
 482                 .addFunction ("get_stride", &LuaCairo::ImageSurface::get_stride)
 483                 .addFunction ("get_width", &LuaCairo::ImageSurface::get_width)
 484                 .addFunction ("get_height", &LuaCairo::ImageSurface::get_height)
 485                 //.addFunction ("get_data", &LuaCairo::ImageSurface::get_data) // uint8_t* array is n/a
 486                 .endClass ()
 487
 488                 .beginClass <LuaCairo::PangoLayout> ("PangoLayout")
 489                 .addConstructor <void (*) (Cairo::Context*, std::string)> ()
 490                 .addCFunction ("get_pixel_size", &LuaCairo::PangoLayout::get_pixel_size)
 491                 .addFunction ("get_text", &LuaCairo::PangoLayout::get_text)
 492                 .addFunction ("set_text", &LuaCairo::PangoLayout::set_text)
 493                 .addFunction ("show_in_cairo_context", &LuaCairo::PangoLayout::show_in_cairo_context)
 494                 .addFunction ("set_markup", &LuaCairo::PangoLayout::set_markup)
 495                 .addFunction ("set_width", &LuaCairo::PangoLayout::set_width)
 496                 .addFunction ("set_ellipsize", &LuaCairo::PangoLayout::set_ellipsize)
 497                 .addFunction ("get_ellipsize", &LuaCairo::PangoLayout::get_ellipsize)
 498                 .addFunction ("is_ellipsized", &LuaCairo::PangoLayout::is_ellipsized)
 499                 .addFunction ("set_wrap", &LuaCairo::PangoLayout::set_wrap)
 500                 .addFunction ("get_wrap", &LuaCairo::PangoLayout::get_wrap)
 501                 .addFunction ("is_wrapped", &LuaCairo::PangoLayout::is_wrapped)
 502                 .endClass ()
 503
 504                 /* enums */
 505                 .beginNamespace ("EllipsizeMode")
 506                 .addConst ("None", Pango::ELLIPSIZE_NONE)
 507                 .addConst ("Start", Pango::ELLIPSIZE_START)
 508                 .addConst ("Middle", Pango::ELLIPSIZE_MIDDLE)
 509                 .addConst ("End", Pango::ELLIPSIZE_END)
 510                 .endNamespace ()
 511
 512                 .beginNamespace ("WrapMode")
 513                 .addConst ("Word", Pango::WRAP_WORD)
 514                 .addConst ("Char", Pango::WRAP_CHAR)
 515                 .addConst ("WordChar", Pango::WRAP_WORD_CHAR)
 516                 .endNamespace ()
 517
 518                 .endNamespace ();
 519
 520 /* Lua/cairo bindings operate on Cairo::Context, there is no Cairo::RefPtr wrapper [yet].
 521   one can work around this as follows:
 522
 523   LuaState lua;
 524   LuaInstance::register_classes (lua.getState());
 525   lua.do_command (
 526       "function render (ctx)"
 527       "  ctx:rectangle (0, 0, 100, 100)"
 528       "  ctx:set_source_rgba (0.1, 1.0, 0.1, 1.0)"
 529       "  ctx:fill ()"
 530       " end"
 531       );
 532   {
 533                 Cairo::RefPtr<Cairo::Context> context = get_window ()->create_cairo_context ();
 534     Cairo::Context ctx (context->cobj ());
 535
 536     luabridge::LuaRef lua_render = luabridge::getGlobal (lua.getState(), "render");
 537     lua_render ((Cairo::Context *)&ctx);
 538   }
 539 */
 540
 541 }
 542
 543 void
 544 LuaInstance::register_classes (lua_State* L)
 545 {
 546         LuaBindings::stddef (L);
 547         LuaBindings::common (L);
 548         LuaBindings::session (L);
 549         LuaBindings::osc (L);
 550
 551         bind_cairo (L);
 552         register_hooks (L);
 553
 554         luabridge::getGlobalNamespace (L)
 555                 .beginNamespace ("ArdourUI")
 556
 557                 .addFunction ("http_get", (std::string (*)(const std::string&))&ArdourCurl::http_get)
 558
 559                 .addFunction ("processor_selection", &LuaMixer::processor_selection)
 560
 561                 .beginStdList <ArdourMarker*> ("ArdourMarkerList")
 562                 .endClass ()
 563
 564                 .beginClass <ArdourMarker> ("ArdourMarker")
 565                 .addFunction ("name", &ArdourMarker::name)
 566                 .addFunction ("position", &ArdourMarker::position)
 567                 .addFunction ("_type", &ArdourMarker::type)
 568                 .endClass ()
 569
 570 #if 0
 571                 .beginClass <AxisView> ("AxisView")
 572                 .endClass ()
 573                 .deriveClass <TimeAxisView, AxisView> ("TimeAxisView")
 574                 .endClass ()
 575                 .deriveClass <RouteTimeAxisView, TimeAxisView> ("RouteTimeAxisView")
 576                 .endClass ()
 577 #endif
 578
 579                 .beginClass <RegionSelection> ("RegionSelection")
 580                 .addFunction ("clear_all", &RegionSelection::clear_all)
 581                 .addFunction ("start", &RegionSelection::start)
 582                 .addFunction ("end_frame", &RegionSelection::end_frame)
 583                 .addFunction ("n_midi_regions", &RegionSelection::n_midi_regions)
 584                 .addFunction ("regionlist", &RegionSelection::regionlist) // XXX check windows binding (libardour)
 585                 .endClass ()
 586
 587                 .deriveClass <TimeSelection, std::list<ARDOUR::AudioRange> > ("TimeSelection")
 588                 .addFunction ("start", &TimeSelection::start)
 589                 .addFunction ("end_frame", &TimeSelection::end_frame)
 590                 .addFunction ("length", &TimeSelection::length)
 591                 .endClass ()
 592
 593                 .deriveClass <MarkerSelection, std::list<ArdourMarker*> > ("MarkerSelection")
 594                 .endClass ()
 595
 596                 .beginClass <TrackViewList> ("TrackViewList")
 597                 .addFunction ("routelist", &TrackViewList::routelist) // XXX check windows binding (libardour)
 598                 .endClass ()
 599
 600                 .deriveClass <TrackSelection, TrackViewList> ("TrackSelection")
 601                 .endClass ()
 602
 603                 .beginClass <Selection> ("Selection")
 604                 .addFunction ("clear", &Selection::clear)
 605                 .addFunction ("clear_all", &Selection::clear_all)
 606                 .addFunction ("empty", &Selection::empty)
 607                 .addData ("tracks", &Selection::tracks)
 608                 .addData ("regions", &Selection::regions)
 609                 .addData ("time", &Selection::time)
 610                 .addData ("markers", &Selection::markers)
 611 #if 0
 612                 .addData ("lines", &Selection::lines)
 613                 .addData ("playlists", &Selection::playlists)
 614                 .addData ("points", &Selection::points)
 615                 .addData ("midi_regions", &Selection::midi_regions)
 616                 .addData ("midi_notes", &Selection::midi_notes) // cut buffer only
 617 #endif
 618                 .endClass ()
 619
 620                 .beginClass <PublicEditor> ("Editor")
 621                 .addFunction ("snap_type", &PublicEditor::snap_type)
 622                 .addFunction ("snap_mode", &PublicEditor::snap_mode)
 623                 .addFunction ("set_snap_mode", &PublicEditor::set_snap_mode)
 624                 .addFunction ("set_snap_threshold", &PublicEditor::set_snap_threshold)
 625
 626                 .addFunction ("undo", &PublicEditor::undo)
 627                 .addFunction ("redo", &PublicEditor::redo)
 628
 629                 .addFunction ("set_mouse_mode", &PublicEditor::set_mouse_mode)
 630                 .addFunction ("current_mouse_mode", &PublicEditor::current_mouse_mode)
 631
 632                 .addFunction ("consider_auditioning", &PublicEditor::consider_auditioning)
 633
 634                 .addFunction ("new_region_from_selection", &PublicEditor::new_region_from_selection)
 635                 .addFunction ("separate_region_from_selection", &PublicEditor::separate_region_from_selection)
 636                 .addFunction ("pixel_to_sample", &PublicEditor::pixel_to_sample)
 637                 .addFunction ("sample_to_pixel", &PublicEditor::sample_to_pixel)
 638
 639                 .addFunction ("get_selection", &PublicEditor::get_selection)
 640                 .addFunction ("get_cut_buffer", &PublicEditor::get_cut_buffer)
 641                 .addRefFunction ("get_selection_extents", &PublicEditor::get_selection_extents)
 642
 643                 .addFunction ("play_selection", &PublicEditor::play_selection)
 644                 .addFunction ("play_with_preroll", &PublicEditor::play_with_preroll)
 645                 .addFunction ("maybe_locate_with_edit_preroll", &PublicEditor::maybe_locate_with_edit_preroll)
 646                 .addFunction ("goto_nth_marker", &PublicEditor::goto_nth_marker)
 647
 648                 .addFunction ("add_location_from_playhead_cursor", &PublicEditor::add_location_from_playhead_cursor)
 649                 .addFunction ("remove_location_at_playhead_cursor", &PublicEditor::remove_location_at_playhead_cursor)
 650
 651                 .addFunction ("set_show_measures", &PublicEditor::set_show_measures)
 652                 .addFunction ("show_measures", &PublicEditor::show_measures)
 653                 .addFunction ("remove_tracks", &PublicEditor::remove_tracks)
 654
 655                 .addFunction ("set_loop_range", &PublicEditor::set_loop_range)
 656                 .addFunction ("set_punch_range", &PublicEditor::set_punch_range)
 657
 658                 .addFunction ("effective_mouse_mode", &PublicEditor::effective_mouse_mode)
 659
 660                 .addRefFunction ("do_import", &PublicEditor::do_import)
 661                 .addRefFunction ("do_embed", &PublicEditor::do_embed)
 662
 663                 .addFunction ("export_audio", &PublicEditor::export_audio)
 664                 .addFunction ("stem_export", &PublicEditor::stem_export)
 665                 .addFunction ("export_selection", &PublicEditor::export_selection)
 666                 .addFunction ("export_range", &PublicEditor::export_range)
 667
 668                 .addFunction ("set_zoom_focus", &PublicEditor::set_zoom_focus)
 669                 .addFunction ("get_zoom_focus", &PublicEditor::get_zoom_focus)
 670                 .addFunction ("get_current_zoom", &PublicEditor::get_current_zoom)
 671                 .addFunction ("reset_zoom", &PublicEditor::reset_zoom)
 672
 673 #if 0 // These need TimeAxisView* which isn't exposed, yet
 674                 .addFunction ("playlist_selector", &PublicEditor::playlist_selector)
 675                 .addFunction ("clear_playlist", &PublicEditor::clear_playlist)
 676                 .addFunction ("new_playlists", &PublicEditor::new_playlists)
 677                 .addFunction ("copy_playlists", &PublicEditor::copy_playlists)
 678                 .addFunction ("clear_playlists", &PublicEditor::clear_playlists)
 679 #endif
 680
 681                 .addFunction ("select_all_tracks", &PublicEditor::select_all_tracks)
 682                 .addFunction ("deselect_all", &PublicEditor::deselect_all)
 683 #if 0
 684                 .addFunction ("set_selected_track", &PublicEditor::set_selected_track)
 685                 .addFunction ("set_selected_mixer_strip", &PublicEditor::set_selected_mixer_strip)
 686                 .addFunction ("hide_track_in_display", &PublicEditor::hide_track_in_display)
 687 #endif
 688                 .addFunction ("set_stationary_playhead", &PublicEditor::set_stationary_playhead)
 689                 .addFunction ("stationary_playhead", &PublicEditor::stationary_playhead)
 690                 .addFunction ("set_follow_playhead", &PublicEditor::set_follow_playhead)
 691                 .addFunction ("follow_playhead", &PublicEditor::follow_playhead)
 692
 693                 .addFunction ("dragging_playhead", &PublicEditor::dragging_playhead)
 694                 .addFunction ("leftmost_sample", &PublicEditor::leftmost_sample)
 695                 .addFunction ("current_page_samples", &PublicEditor::current_page_samples)
 696                 .addFunction ("visible_canvas_height", &PublicEditor::visible_canvas_height)
 697                 .addFunction ("temporal_zoom_step", &PublicEditor::temporal_zoom_step)
 698                 //.addFunction ("ensure_time_axis_view_is_visible", &PublicEditor::ensure_time_axis_view_is_visible)
 699                 .addFunction ("override_visible_track_count", &PublicEditor::override_visible_track_count)
 700
 701                 .addFunction ("scroll_tracks_down_line", &PublicEditor::scroll_tracks_down_line)
 702                 .addFunction ("scroll_tracks_up_line", &PublicEditor::scroll_tracks_up_line)
 703                 .addFunction ("scroll_down_one_track", &PublicEditor::scroll_down_one_track)
 704                 .addFunction ("scroll_up_one_track", &PublicEditor::scroll_up_one_track)
 705
 706                 .addFunction ("reset_x_origin", &PublicEditor::reset_x_origin)
 707                 .addFunction ("get_y_origin", &PublicEditor::get_y_origin)
 708                 .addFunction ("reset_y_origin", &PublicEditor::reset_y_origin)
 709
 710                 .addFunction ("remove_last_capture", &PublicEditor::remove_last_capture)
 711
 712                 .addFunction ("maximise_editing_space", &PublicEditor::maximise_editing_space)
 713                 .addFunction ("restore_editing_space", &PublicEditor::restore_editing_space)
 714                 .addFunction ("toggle_meter_updating", &PublicEditor::toggle_meter_updating)
 715
 716                 //.addFunction ("get_preferred_edit_position", &PublicEditor::get_preferred_edit_position)
 717                 //.addFunction ("split_regions_at", &PublicEditor::split_regions_at)
 718
 719                 .addRefFunction ("get_nudge_distance", &PublicEditor::get_nudge_distance)
 720                 .addFunction ("get_paste_offset", &PublicEditor::get_paste_offset)
 721                 .addFunction ("get_grid_beat_divisions", &PublicEditor::get_grid_beat_divisions)
 722                 .addRefFunction ("get_grid_type_as_beats", &PublicEditor::get_grid_type_as_beats)
 723
 724                 .addFunction ("toggle_ruler_video", &PublicEditor::toggle_ruler_video)
 725                 .addFunction ("toggle_xjadeo_proc", &PublicEditor::toggle_xjadeo_proc)
 726                 .addFunction ("get_videotl_bar_height", &PublicEditor::get_videotl_bar_height)
 727                 .addFunction ("set_video_timeline_height", &PublicEditor::set_video_timeline_height)
 728
 729 #if 0
 730                 .addFunction ("get_route_view_by_route_id", &PublicEditor::get_route_view_by_route_id)
 731                 .addFunction ("get_equivalent_regions", &PublicEditor::get_equivalent_regions)
 732
 733                 .addFunction ("axis_view_from_route", &PublicEditor::axis_view_from_route)
 734                 .addFunction ("axis_views_from_routes", &PublicEditor::axis_views_from_routes)
 735                 .addFunction ("get_track_views", &PublicEditor::get_track_views)
 736                 .addFunction ("drags", &PublicEditor::drags)
 737 #endif
 738
 739                 .addFunction ("center_screen", &PublicEditor::center_screen)
 740
 741                 .addFunction ("get_smart_mode", &PublicEditor::get_smart_mode)
 742                 .addRefFunction ("get_pointer_position", &PublicEditor::get_pointer_position)
 743
 744                 .addRefFunction ("find_location_from_marker", &PublicEditor::find_location_from_marker)
 745                 .addFunction ("find_marker_from_location_id", &PublicEditor::find_marker_from_location_id)
 746                 .addFunction ("mouse_add_new_marker", &PublicEditor::mouse_add_new_marker)
 747 #if 0
 748                 .addFunction ("get_regions_at", &PublicEditor::get_regions_at)
 749                 .addFunction ("get_regions_after", &PublicEditor::get_regions_after)
 750                 .addFunction ("get_regions_from_selection_and_mouse", &PublicEditor::get_regions_from_selection_and_mouse)
 751                 .addFunction ("get_regionviews_by_id", &PublicEditor::get_regionviews_by_id)
 752                 .addFunction ("get_per_region_note_selection", &PublicEditor::get_per_region_note_selection)
 753 #endif
 754
 755 #if 0
 756                 .addFunction ("mouse_add_new_tempo_event", &PublicEditor::mouse_add_new_tempo_event)
 757                 .addFunction ("mouse_add_new_meter_event", &PublicEditor::mouse_add_new_meter_event)
 758                 .addFunction ("edit_tempo_section", &PublicEditor::edit_tempo_section)
 759                 .addFunction ("edit_meter_section", &PublicEditor::edit_meter_section)
 760 #endif
 761
 762                 .addFunction ("access_action", &PublicEditor::access_action)
 763                 .endClass ()
 764
 765                 /* ArdourUI enums */
 766                 .beginNamespace ("MarkerType")
 767                 .addConst ("Mark", ArdourMarker::Type(ArdourMarker::Mark))
 768                 .addConst ("Tempo", ArdourMarker::Type(ArdourMarker::Tempo))
 769                 .addConst ("Meter", ArdourMarker::Type(ArdourMarker::Meter))
 770                 .addConst ("SessionStart", ArdourMarker::Type(ArdourMarker::SessionStart))
 771                 .addConst ("SessionEnd", ArdourMarker::Type(ArdourMarker::SessionEnd))
 772                 .addConst ("RangeStart", ArdourMarker::Type(ArdourMarker::RangeStart))
 773                 .addConst ("RangeEnd", ArdourMarker::Type(ArdourMarker::RangeEnd))
 774                 .addConst ("LoopStart", ArdourMarker::Type(ArdourMarker::LoopStart))
 775                 .addConst ("LoopEnd", ArdourMarker::Type(ArdourMarker::LoopEnd))
 776                 .addConst ("PunchIn", ArdourMarker::Type(ArdourMarker::PunchIn))
 777                 .addConst ("PunchOut", ArdourMarker::Type(ArdourMarker::PunchOut))
 778                 .endNamespace ()
 779
 780                 .endNamespace (); // end ArdourUI
 781
 782         // Editing Symbols
 783
 784 #undef ZOOMFOCUS
 785 #undef SNAPTYPE
 786 #undef SNAPMODE
 787 #undef MOUSEMODE
 788 #undef DISPLAYCONTROL
 789 #undef IMPORTMODE
 790 #undef IMPORTPOSITION
 791 #undef IMPORTDISPOSITION
 792
 793 #define ZOOMFOCUS(NAME) .addConst (stringify(NAME), (Editing::ZoomFocus)Editing::NAME)
 794 #define SNAPTYPE(NAME) .addConst (stringify(NAME), (Editing::SnapType)Editing::NAME)
 795 #define SNAPMODE(NAME) .addConst (stringify(NAME), (Editing::SnapMode)Editing::NAME)
 796 #define MOUSEMODE(NAME) .addConst (stringify(NAME), (Editing::MouseMode)Editing::NAME)
 797 #define DISPLAYCONTROL(NAME) .addConst (stringify(NAME), (Editing::DisplayControl)Editing::NAME)
 798 #define IMPORTMODE(NAME) .addConst (stringify(NAME), (Editing::ImportMode)Editing::NAME)
 799 #define IMPORTPOSITION(NAME) .addConst (stringify(NAME), (Editing::ImportPosition)Editing::NAME)
 800 #define IMPORTDISPOSITION(NAME) .addConst (stringify(NAME), (Editing::ImportDisposition)Editing::NAME)
 801         luabridge::getGlobalNamespace (L)
 802                 .beginNamespace ("Editing")
 803 #               include "editing_syms.h"
 804                 .endNamespace ();
 805 }
 806
 807 #undef xstr
 808 #undef stringify
 809
 810 ////////////////////////////////////////////////////////////////////////////////
 811
 812 using namespace ARDOUR;
 813 using namespace ARDOUR_UI_UTILS;
 814 using namespace PBD;
 815 using namespace std;
 816
 817 static void _lua_print (std::string s) {
 818 #ifndef NDEBUG
 819         std::cout << "LuaInstance: " << s << "\n";
 820 #endif
 821         PBD::info << "LuaInstance: " << s << endmsg;
 822 }
 823
 824 LuaInstance* LuaInstance::_instance = 0;
 825
 826 LuaInstance*
 827 LuaInstance::instance ()
 828 {
 829         if (!_instance) {
 830                 _instance  = new LuaInstance;
 831         }
 832
 833         return _instance;
 834 }
 835
 836 void
 837 LuaInstance::destroy_instance ()
 838 {
 839         delete _instance;
 840         _instance = 0;
 841 }
 842
 843 LuaInstance::LuaInstance ()
 844 {
 845         lua.Print.connect (&_lua_print);
 846         init ();
 847
 848         LuaScriptParamList args;
 849 }
 850
 851 LuaInstance::~LuaInstance ()
 852 {
 853         delete _lua_call_action;
 854         delete _lua_add_action;
 855         delete _lua_del_action;
 856         delete _lua_get_action;
 857
 858         delete _lua_load;
 859         delete _lua_save;
 860         delete _lua_clear;
 861         _callbacks.clear();
 862 }
 863
 864 void
 865 LuaInstance::init ()
 866 {
 867         lua.do_command (
 868                         "function ScriptManager ()"
 869                         "  local self = { scripts = {}, instances = {} }"
 870                         ""
 871                         "  local remove = function (id)"
 872                         "   self.scripts[id] = nil"
 873                         "   self.instances[id] = nil"
 874                         "  end"
 875                         ""
 876                         "  local addinternal = function (i, n, s, f, a)"
 877                         "   assert(type(i) == 'number', 'id must be numeric')"
 878                         "   assert(type(n) == 'string', 'Name must be string')"
 879                         "   assert(type(s) == 'string', 'Script must be string')"
 880                         "   assert(type(f) == 'function', 'Factory is a not a function')"
 881                         "   assert(type(a) == 'table' or type(a) == 'nil', 'Given argument is invalid')"
 882                         "   self.scripts[i] = { ['n'] = n, ['s'] = s, ['f'] = f, ['a'] = a }"
 883                         "   local env = _ENV;  env.f = nil env.debug = nil os.exit = nil require = nil dofile = nil loadfile = nil package = nil"
 884                         "   self.instances[i] = load (string.dump(f, true), nil, nil, env)(a)"
 885                         "  end"
 886                         ""
 887                         "  local call = function (id)"
 888                         "   if type(self.instances[id]) == 'function' then"
 889                         "     local status, err = pcall (self.instances[id])"
 890                         "     if not status then"
 891                         "       print ('action \"'.. id .. '\": ', err)" // error out
 892                         "       remove (id)"
 893                         "     end"
 894                         "   end"
 895                         "   collectgarbage()"
 896                         "  end"
 897                         ""
 898                         "  local add = function (i, n, s, b, a)"
 899                         "   assert(type(b) == 'string', 'ByteCode must be string')"
 900                         "   load (b)()" // assigns f
 901                         "   assert(type(f) == 'string', 'Assigned ByteCode must be string')"
 902                         "   addinternal (i, n, s, load(f), a)"
 903                         "  end"
 904                         ""
 905                         "  local get = function (id)"
 906                         "   if type(self.scripts[id]) == 'table' then"
 907                         "    return { ['name'] = self.scripts[id]['n'],"
 908                         "             ['script'] = self.scripts[id]['s'],"
 909                         "             ['args'] = self.scripts[id]['a'] }"
 910                         "   end"
 911                         "   return nil"
 912                         "  end"
 913                         ""
 914                         "  local function basic_serialize (o)"
 915                         "    if type(o) == \"number\" then"
 916                         "     return tostring(o)"
 917                         "    else"
 918                         "     return string.format(\"%q\", o)"
 919                         "    end"
 920                         "  end"
 921                         ""
 922                         "  local function serialize (name, value)"
 923                         "   local rv = name .. ' = '"
 924                         "   collectgarbage()"
 925                         "   if type(value) == \"number\" or type(value) == \"string\" or type(value) == \"nil\" then"
 926                         "    return rv .. basic_serialize(value) .. ' '"
 927                         "   elseif type(value) == \"table\" then"
 928                         "    rv = rv .. '{} '"
 929                         "    for k,v in pairs(value) do"
 930                         "     local fieldname = string.format(\"%s[%s]\", name, basic_serialize(k))"
 931                         "     rv = rv .. serialize(fieldname, v) .. ' '"
 932                         "     collectgarbage()" // string concatenation allocates a new string
 933                         "    end"
 934                         "    return rv;"
 935                         "   elseif type(value) == \"function\" then"
 936                         "     return rv .. string.format(\"%q\", string.dump(value, true))"
 937                         "   else"
 938                         "    error('cannot save a ' .. type(value))"
 939                         "   end"
 940                         "  end"
 941                         ""
 942                         ""
 943                         "  local save = function ()"
 944                         "   return (serialize('scripts', self.scripts))"
 945                         "  end"
 946                         ""
 947                         "  local clear = function ()"
 948                         "   self.scripts = {}"
 949                         "   self.instances = {}"
 950                         "   collectgarbage()"
 951                         "  end"
 952                         ""
 953                         "  local restore = function (state)"
 954                         "   clear()"
 955                         "   load (state)()"
 956                         "   for i, s in pairs (scripts) do"
 957                         "    addinternal (i, s['n'], s['s'], load(s['f']), s['a'])"
 958                         "   end"
 959                         "   collectgarbage()"
 960                         "  end"
 961                         ""
 962                         " return { call = call, add = add, remove = remove, get = get,"
 963                         "          restore = restore, save = save, clear = clear}"
 964                         " end"
 965                         " "
 966                         " manager = ScriptManager ()"
 967                         " ScriptManager = nil"
 968                         );
 969
 970         lua_State* L = lua.getState();
 971
 972         try {
 973                 luabridge::LuaRef lua_mgr = luabridge::getGlobal (L, "manager");
 974                 lua.do_command ("manager = nil"); // hide it.
 975                 lua.do_command ("collectgarbage()");
 976
 977                 _lua_add_action = new luabridge::LuaRef(lua_mgr["add"]);
 978                 _lua_del_action = new luabridge::LuaRef(lua_mgr["remove"]);
 979                 _lua_get_action = new luabridge::LuaRef(lua_mgr["get"]);
 980                 _lua_call_action = new luabridge::LuaRef(lua_mgr["call"]);
 981                 _lua_save = new luabridge::LuaRef(lua_mgr["save"]);
 982                 _lua_load = new luabridge::LuaRef(lua_mgr["restore"]);
 983                 _lua_clear = new luabridge::LuaRef(lua_mgr["clear"]);
 984
 985         } catch (luabridge::LuaException const& e) {
 986                 fatal << string_compose (_("programming error: %1"),
 987                                 X_("Failed to setup Lua action interpreter"))
 988                         << endmsg;
 989                 abort(); /*NOTREACHED*/
 990         }
 991
 992         register_classes (L);
 993
 994         luabridge::push <PublicEditor *> (L, &PublicEditor::instance());
 995         lua_setglobal (L, "Editor");
 996 }
 997
 998 void LuaInstance::set_session (Session* s)
 999 {
1000         SessionHandlePtr::set_session (s);
1001         if (!_session) {
1002                 return;
1003         }
1004
1005         lua_State* L = lua.getState();
1006         LuaBindings::set_session (L, _session);
1007
1008         for (LuaCallbackMap::iterator i = _callbacks.begin(); i != _callbacks.end(); ++i) {
1009                 i->second->set_session (s);
1010         }
1011         point_one_second_connection = Timers::rapid_connect (sigc::mem_fun(*this, & LuaInstance::every_point_one_seconds));
1012 }
1013
1014 void
1015 LuaInstance::session_going_away ()
1016 {
1017         ENSURE_GUI_THREAD (*this, &LuaInstance::session_going_away);
1018         point_one_second_connection.disconnect ();
1019
1020         (*_lua_clear)();
1021         for (int i = 0; i < 9; ++i) {
1022                 ActionChanged (i, ""); /* EMIT SIGNAL */
1023         }
1024         SessionHandlePtr::session_going_away ();
1025         _session = 0;
1026
1027         lua_State* L = lua.getState();
1028         LuaBindings::set_session (L, _session);
1029         lua.do_command ("collectgarbage();");
1030 }
1031
1032 void
1033 LuaInstance::every_point_one_seconds ()
1034 {
1035         LuaTimerDS (); // emit signal
1036 }
1037
1038 int
1039 LuaInstance::set_state (const XMLNode& node)
1040 {
1041         LocaleGuard lg;
1042         XMLNode* child;
1043
1044         if ((child = find_named_node (node, "ActionScript"))) {
1045                 for (XMLNodeList::const_iterator n = child->children ().begin (); n != child->children ().end (); ++n) {
1046                         if (!(*n)->is_content ()) { continue; }
1047                         gsize size;
1048                         guchar* buf = g_base64_decode ((*n)->content ().c_str (), &size);
1049                         try {
1050                                 (*_lua_load)(std::string ((const char*)buf, size));
1051                         } catch (luabridge::LuaException const& e) {
1052                                 cerr << "LuaException:" << e.what () << endl;
1053                         }
1054                         for (int i = 0; i < 9; ++i) {
1055                                 std::string name;
1056                                 if (lua_action_name (i, name)) {
1057                                         ActionChanged (i, name); /* EMIT SIGNAL */
1058                                 }
1059                         }
1060                         g_free (buf);
1061                 }
1062         }
1063
1064         if ((child = find_named_node (node, "ActionHooks"))) {
1065                 for (XMLNodeList::const_iterator n = child->children ().begin (); n != child->children ().end (); ++n) {
1066                         try {
1067                                 LuaCallbackPtr p (new LuaCallback (_session, *(*n)));
1068                                 _callbacks.insert (std::make_pair(p->id(), p));
1069                                 p->drop_callback.connect (_slotcon, MISSING_INVALIDATOR, boost::bind (&LuaInstance::unregister_lua_slot, this, p->id()), gui_context());
1070                                 SlotChanged (p->id(), p->name(), p->signals()); /* EMIT SIGNAL */
1071                         } catch (luabridge::LuaException const& e) {
1072                                 cerr << "LuaException:" << e.what () << endl;
1073                         }
1074                 }
1075         }
1076
1077         return 0;
1078 }
1079
1080 bool
1081 LuaInstance::interactive_add (LuaScriptInfo::ScriptType type, int id)
1082 {
1083         std::string title;
1084         std::vector<std::string> reg;
1085
1086         switch (type) {
1087                 case LuaScriptInfo::EditorAction:
1088                         reg = lua_action_names ();
1089                         title = "Add Lua Action";
1090                         break;
1091                 case LuaScriptInfo::EditorHook:
1092                         reg = lua_slot_names ();
1093                         title = "Add Lua Callback Hook";
1094                         break;
1095                 default:
1096                         return false;
1097         }
1098
1099         LuaScriptInfoPtr spi;
1100         ScriptSelector ss (title, type);
1101         switch (ss.run ()) {
1102                 case Gtk::RESPONSE_ACCEPT:
1103                         spi = ss.script();
1104                         break;
1105                 default:
1106                         return false;
1107         }
1108         ss.hide ();
1109
1110         std::string script = "";
1111
1112         try {
1113                 script = Glib::file_get_contents (spi->path);
1114         } catch (Glib::FileError e) {
1115                 string msg = string_compose (_("Cannot read script '%1': %2"), spi->path, e.what());
1116                 Gtk::MessageDialog am (msg);
1117                 am.run ();
1118                 return false;
1119         }
1120
1121         LuaScriptParamList lsp = LuaScriptParams::script_params (spi, "action_params");
1122
1123         ScriptParameterDialog spd (_("Set Script Parameters"), spi, reg, lsp);
1124         switch (spd.run ()) {
1125                 case Gtk::RESPONSE_ACCEPT:
1126                         break;
1127                 default:
1128                         return false;
1129         }
1130
1131         switch (type) {
1132                 case LuaScriptInfo::EditorAction:
1133                         return set_lua_action (id, spd.name(), script, lsp);
1134                         break;
1135                 case LuaScriptInfo::EditorHook:
1136                         return register_lua_slot (spd.name(), script, lsp);
1137                         break;
1138                 default:
1139                         break;
1140         }
1141         return false;
1142 }
1143
1144 XMLNode&
1145 LuaInstance::get_action_state ()
1146 {
1147         LocaleGuard lg;
1148         std::string saved;
1149         {
1150                 luabridge::LuaRef savedstate ((*_lua_save)());
1151                 saved = savedstate.cast<std::string>();
1152         }
1153         lua.collect_garbage ();
1154
1155         gchar* b64 = g_base64_encode ((const guchar*)saved.c_str (), saved.size ());
1156         std::string b64s (b64);
1157         g_free (b64);
1158
1159         XMLNode* script_node = new XMLNode (X_("ActionScript"));
1160         script_node->add_property (X_("lua"), LUA_VERSION);
1161         script_node->add_content (b64s);
1162
1163         return *script_node;
1164 }
1165
1166 XMLNode&
1167 LuaInstance::get_hook_state ()
1168 {
1169         XMLNode* script_node = new XMLNode (X_("ActionHooks"));
1170         for (LuaCallbackMap::const_iterator i = _callbacks.begin(); i != _callbacks.end(); ++i) {
1171                 script_node->add_child_nocopy (i->second->get_state ());
1172         }
1173         return *script_node;
1174 }
1175
1176 void
1177 LuaInstance::call_action (const int id)
1178 {
1179         try {
1180                 (*_lua_call_action)(id + 1);
1181                 lua.collect_garbage_step ();
1182         } catch (luabridge::LuaException const& e) {
1183                 cerr << "LuaException:" << e.what () << endl;
1184         }
1185 }
1186
1187 bool
1188 LuaInstance::set_lua_action (
1189                 const int id,
1190                 const std::string& name,
1191                 const std::string& script,
1192                 const LuaScriptParamList& args)
1193 {
1194         try {
1195                 lua_State* L = lua.getState();
1196                 // get bytcode of factory-function in a sandbox
1197                 // (don't allow scripts to interfere)
1198                 const std::string& bytecode = LuaScripting::get_factory_bytecode (script);
1199                 luabridge::LuaRef tbl_arg (luabridge::newTable(L));
1200                 for (LuaScriptParamList::const_iterator i = args.begin(); i != args.end(); ++i) {
1201                         if ((*i)->optional && !(*i)->is_set) { continue; }
1202                         tbl_arg[(*i)->name] = (*i)->value;
1203                 }
1204                 (*_lua_add_action)(id + 1, name, script, bytecode, tbl_arg);
1205                 ActionChanged (id, name); /* EMIT SIGNAL */
1206         } catch (luabridge::LuaException const& e) {
1207                 cerr << "LuaException:" << e.what () << endl;
1208                 return false;
1209         }
1210         return true;
1211 }
1212
1213 bool
1214 LuaInstance::remove_lua_action (const int id)
1215 {
1216         try {
1217                 (*_lua_del_action)(id + 1);
1218         } catch (luabridge::LuaException const& e) {
1219                 cerr << "LuaException:" << e.what () << endl;
1220                 return false;
1221         }
1222         ActionChanged (id, ""); /* EMIT SIGNAL */
1223         return true;
1224 }
1225
1226 bool
1227 LuaInstance::lua_action_name (const int id, std::string& rv)
1228 {
1229         try {
1230                 luabridge::LuaRef ref ((*_lua_get_action)(id + 1));
1231                 if (ref.isNil()) {
1232                         return false;
1233                 }
1234                 if (ref["name"].isString()) {
1235                         rv = ref["name"].cast<std::string>();
1236                         return true;
1237                 }
1238                 return true;
1239         } catch (luabridge::LuaException const& e) {
1240                 cerr << "LuaException:" << e.what () << endl;
1241                 return false;
1242         }
1243         return false;
1244 }
1245
1246 std::vector<std::string>
1247 LuaInstance::lua_action_names ()
1248 {
1249         std::vector<std::string> rv;
1250         for (int i = 0; i < 9; ++i) {
1251                 std::string name;
1252                 if (lua_action_name (i, name)) {
1253                         rv.push_back (name);
1254                 }
1255         }
1256         return rv;
1257 }
1258
1259 bool
1260 LuaInstance::lua_action (const int id, std::string& name, std::string& script, LuaScriptParamList& args)
1261 {
1262         try {
1263                 luabridge::LuaRef ref ((*_lua_get_action)(id + 1));
1264                 if (ref.isNil()) {
1265                         return false;
1266                 }
1267                 if (!ref["name"].isString()) {
1268                         return false;
1269                 }
1270                 if (!ref["script"].isString()) {
1271                         return false;
1272                 }
1273                 if (!ref["args"].isTable()) {
1274                         return false;
1275                 }
1276                 name = ref["name"].cast<std::string>();
1277                 script = ref["script"].cast<std::string>();
1278
1279                 args.clear();
1280                 LuaScriptInfoPtr lsi = LuaScripting::script_info (script);
1281                 if (!lsi) {
1282                         return false;
1283                 }
1284                 args = LuaScriptParams::script_params (lsi, "action_params");
1285                 luabridge::LuaRef rargs (ref["args"]);
1286                 LuaScriptParams::ref_to_params (args, &rargs);
1287                 return true;
1288         } catch (luabridge::LuaException const& e) {
1289                 cerr << "LuaException:" << e.what () << endl;
1290                 return false;
1291         }
1292         return false;
1293 }
1294
1295 bool
1296 LuaInstance::register_lua_slot (const std::string& name, const std::string& script, const ARDOUR::LuaScriptParamList& args)
1297 {
1298         /* parse script, get ActionHook(s) from script */
1299         ActionHook ah;
1300         try {
1301                 LuaState l;
1302                 l.Print.connect (&_lua_print);
1303                 lua_State* L = l.getState();
1304                 register_hooks (L);
1305                 l.do_command ("function ardour () end");
1306                 l.do_command (script);
1307                 luabridge::LuaRef signals = luabridge::getGlobal (L, "signals");
1308                 if (signals.isFunction()) {
1309                         ah = signals();
1310                 }
1311         } catch (luabridge::LuaException const& e) {
1312                 cerr << "LuaException:" << e.what () << endl;
1313         }
1314
1315         if (ah.none ()) {
1316                 cerr << "Script registered no hooks." << endl;
1317                 return false;
1318         }
1319
1320         /* register script w/args, get entry-point / ID */
1321
1322         try {
1323                 LuaCallbackPtr p (new LuaCallback (_session, name, script, ah, args));
1324                 _callbacks.insert (std::make_pair(p->id(), p));
1325                 p->drop_callback.connect (_slotcon, MISSING_INVALIDATOR, boost::bind (&LuaInstance::unregister_lua_slot, this, p->id()), gui_context());
1326                 SlotChanged (p->id(), p->name(), p->signals()); /* EMIT SIGNAL */
1327                 return true;
1328         } catch (luabridge::LuaException const& e) {
1329                 cerr << "LuaException:" << e.what () << endl;
1330         }
1331         return false;
1332 }
1333
1334 bool
1335 LuaInstance::unregister_lua_slot (const PBD::ID& id)
1336 {
1337         LuaCallbackMap::iterator i = _callbacks.find (id);
1338         if (i != _callbacks.end()) {
1339                 SlotChanged (id, "", ActionHook()); /* EMIT SIGNAL */
1340                 _callbacks.erase (i);
1341                 return true;
1342         }
1343         return false;
1344 }
1345
1346 std::vector<PBD::ID>
1347 LuaInstance::lua_slots () const
1348 {
1349         std::vector<PBD::ID> rv;
1350         for (LuaCallbackMap::const_iterator i = _callbacks.begin(); i != _callbacks.end(); ++i) {
1351                 rv.push_back (i->first);
1352         }
1353         return rv;
1354 }
1355
1356 bool
1357 LuaInstance::lua_slot_name (const PBD::ID& id, std::string& name) const
1358 {
1359         LuaCallbackMap::const_iterator i = _callbacks.find (id);
1360         if (i != _callbacks.end()) {
1361                 name = i->second->name();
1362                 return true;
1363         }
1364         return false;
1365 }
1366
1367 std::vector<std::string>
1368 LuaInstance::lua_slot_names () const
1369 {
1370         std::vector<std::string> rv;
1371         std::vector<PBD::ID> ids = lua_slots();
1372         for (std::vector<PBD::ID>::const_iterator i = ids.begin(); i != ids.end(); ++i) {
1373                 std::string name;
1374                 if (lua_slot_name (*i, name)) {
1375                         rv.push_back (name);
1376                 }
1377         }
1378         return rv;
1379 }
1380
1381 bool
1382 LuaInstance::lua_slot (const PBD::ID& id, std::string& name, std::string& script, ActionHook& ah, ARDOUR::LuaScriptParamList& args)
1383 {
1384         LuaCallbackMap::const_iterator i = _callbacks.find (id);
1385         if (i == _callbacks.end()) {
1386                 return false; // error
1387         }
1388         return i->second->lua_slot (name, script, ah, args);
1389 }
1390
1391 ///////////////////////////////////////////////////////////////////////////////
1392
1393 LuaCallback::LuaCallback (Session *s,
1394                 const std::string& name,
1395                 const std::string& script,
1396                 const ActionHook& ah,
1397                 const ARDOUR::LuaScriptParamList& args)
1398         : SessionHandlePtr (s)
1399         , _id ("0")
1400         , _name (name)
1401         , _signals (ah)
1402 {
1403         // TODO: allow to reference object (e.g region)
1404         init ();
1405
1406         lua_State* L = lua.getState();
1407         luabridge::LuaRef tbl_arg (luabridge::newTable(L));
1408         for (LuaScriptParamList::const_iterator i = args.begin(); i != args.end(); ++i) {
1409                 if ((*i)->optional && !(*i)->is_set) { continue; }
1410                 tbl_arg[(*i)->name] = (*i)->value;
1411         }
1412
1413         try {
1414         const std::string& bytecode = LuaScripting::get_factory_bytecode (script);
1415         (*_lua_add)(name, script, bytecode, tbl_arg);
1416         } catch (luabridge::LuaException const& e) {
1417                 cerr << "LuaException:" << e.what () << endl;
1418                 throw failed_constructor ();
1419         }
1420
1421         _id.reset ();
1422         set_session (s);
1423 }
1424
1425 LuaCallback::LuaCallback (Session *s, XMLNode & node)
1426         : SessionHandlePtr (s)
1427 {
1428         XMLNode* child = NULL;
1429         if (node.name() != X_("LuaCallback")
1430                         || !node.property ("signals")
1431                         || !node.property ("id")
1432                         || !node.property ("name")) {
1433                 throw failed_constructor ();
1434         }
1435
1436         for (XMLNodeList::const_iterator n = node.children ().begin (); n != node.children ().end (); ++n) {
1437                 if (!(*n)->is_content ()) { continue; }
1438                 child = *n;
1439         }
1440
1441         if (!child) {
1442                 throw failed_constructor ();
1443         }
1444
1445         init ();
1446
1447         _id = PBD::ID (node.property ("id")->value ());
1448         _name = node.property ("name")->value ();
1449         _signals = ActionHook (node.property ("signals")->value ());
1450
1451         gsize size;
1452         guchar* buf = g_base64_decode (child->content ().c_str (), &size);
1453         try {
1454                 (*_lua_load)(std::string ((const char*)buf, size));
1455         } catch (luabridge::LuaException const& e) {
1456                 cerr << "LuaException:" << e.what () << endl;
1457         }
1458         g_free (buf);
1459
1460         set_session (s);
1461 }
1462
1463 LuaCallback::~LuaCallback ()
1464 {
1465         delete _lua_add;
1466         delete _lua_get;
1467         delete _lua_call;
1468         delete _lua_load;
1469         delete _lua_save;
1470 }
1471
1472 XMLNode&
1473 LuaCallback::get_state (void)
1474 {
1475         std::string saved;
1476         {
1477                 luabridge::LuaRef savedstate ((*_lua_save)());
1478                 saved = savedstate.cast<std::string>();
1479         }
1480         lua.collect_garbage ();
1481
1482         gchar* b64 = g_base64_encode ((const guchar*)saved.c_str (), saved.size ());
1483         std::string b64s (b64);
1484         g_free (b64);
1485
1486         XMLNode* script_node = new XMLNode (X_("LuaCallback"));
1487         script_node->add_property (X_("lua"), LUA_VERSION);
1488         script_node->add_property (X_("id"), _id.to_s ());
1489         script_node->add_property (X_("name"), _name);
1490         script_node->add_property (X_("signals"), _signals.to_string ());
1491         script_node->add_content (b64s);
1492         return *script_node;
1493 }
1494
1495 void
1496 LuaCallback::init (void)
1497 {
1498         lua.Print.connect (&_lua_print);
1499
1500         lua.do_command (
1501                         "function ScriptManager ()"
1502                         "  local self = { script = {}, instance = {} }"
1503                         ""
1504                         "  local addinternal = function (n, s, f, a)"
1505                         "   assert(type(n) == 'string', 'Name must be string')"
1506                         "   assert(type(s) == 'string', 'Script must be string')"
1507                         "   assert(type(f) == 'function', 'Factory is a not a function')"
1508                         "   assert(type(a) == 'table' or type(a) == 'nil', 'Given argument is invalid')"
1509                         "   self.script = { ['n'] = n, ['s'] = s, ['f'] = f, ['a'] = a }"
1510                         "   local env = _ENV;  env.f = nil env.debug = nil os.exit = nil require = nil dofile = nil loadfile = nil package = nil"
1511                         "   self.instance = load (string.dump(f, true), nil, nil, env)(a)"
1512                         "  end"
1513                         ""
1514                         "  local call = function (...)"
1515                         "   if type(self.instance) == 'function' then"
1516                         "     local status, err = pcall (self.instance, ...)"
1517                         "     if not status then"
1518                         "       print ('callback \"'.. self.script['n'] .. '\": ', err)" // error out
1519                         "       self.script = nil"
1520                         "       self.instance = nil"
1521                         "       return false"
1522                         "     end"
1523                         "   end"
1524                         "   collectgarbage()"
1525                         "   return true"
1526                         "  end"
1527                         ""
1528                         "  local add = function (n, s, b, a)"
1529                         "   assert(type(b) == 'string', 'ByteCode must be string')"
1530                         "   load (b)()" // assigns f
1531                         "   assert(type(f) == 'string', 'Assigned ByteCode must be string')"
1532                         "   addinternal (n, s, load(f), a)"
1533                         "  end"
1534                         ""
1535                         "  local get = function ()"
1536                         "   if type(self.instance) == 'function' and type(self.script['n']) == 'string' then"
1537                         "    return { ['name'] = self.script['n'],"
1538                         "             ['script'] = self.script['s'],"
1539                         "             ['args'] = self.script['a'] }"
1540                         "   end"
1541                         "   return nil"
1542                         "  end"
1543                         ""
1544                         // code dup
1545                         ""
1546                         "  local function basic_serialize (o)"
1547                         "    if type(o) == \"number\" then"
1548                         "     return tostring(o)"
1549                         "    else"
1550                         "     return string.format(\"%q\", o)"
1551                         "    end"
1552                         "  end"
1553                         ""
1554                         "  local function serialize (name, value)"
1555                         "   local rv = name .. ' = '"
1556                         "   collectgarbage()"
1557                         "   if type(value) == \"number\" or type(value) == \"string\" or type(value) == \"nil\" then"
1558                         "    return rv .. basic_serialize(value) .. ' '"
1559                         "   elseif type(value) == \"table\" then"
1560                         "    rv = rv .. '{} '"
1561                         "    for k,v in pairs(value) do"
1562                         "     local fieldname = string.format(\"%s[%s]\", name, basic_serialize(k))"
1563                         "     rv = rv .. serialize(fieldname, v) .. ' '"
1564                         "     collectgarbage()" // string concatenation allocates a new string
1565                         "    end"
1566                         "    return rv;"
1567                         "   elseif type(value) == \"function\" then"
1568                         "     return rv .. string.format(\"%q\", string.dump(value, true))"
1569                         "   else"
1570                         "    error('cannot save a ' .. type(value))"
1571                         "   end"
1572                         "  end"
1573                         ""
1574                         // end code dup
1575                         ""
1576                         "  local save = function ()"
1577                         "   return (serialize('s', self.script))"
1578                         "  end"
1579                         ""
1580                         "  local restore = function (state)"
1581                         "   self.script = {}"
1582                         "   load (state)()"
1583                         "   addinternal (s['n'], s['s'], load(s['f']), s['a'])"
1584                         "  end"
1585                         ""
1586                         " return { call = call, add = add, get = get,"
1587                         "          restore = restore, save = save}"
1588                         " end"
1589                         " "
1590                         " manager = ScriptManager ()"
1591                         " ScriptManager = nil"
1592                         );
1593
1594         lua_State* L = lua.getState();
1595
1596         try {
1597                 luabridge::LuaRef lua_mgr = luabridge::getGlobal (L, "manager");
1598                 lua.do_command ("manager = nil"); // hide it.
1599                 lua.do_command ("collectgarbage()");
1600
1601                 _lua_add = new luabridge::LuaRef(lua_mgr["add"]);
1602                 _lua_get = new luabridge::LuaRef(lua_mgr["get"]);
1603                 _lua_call = new luabridge::LuaRef(lua_mgr["call"]);
1604                 _lua_save = new luabridge::LuaRef(lua_mgr["save"]);
1605                 _lua_load = new luabridge::LuaRef(lua_mgr["restore"]);
1606
1607         } catch (luabridge::LuaException const& e) {
1608                 fatal << string_compose (_("programming error: %1"),
1609                                 X_("Failed to setup Lua callback interpreter"))
1610                         << endmsg;
1611                 abort(); /*NOTREACHED*/
1612         }
1613
1614         LuaInstance::register_classes (L);
1615
1616         luabridge::push <PublicEditor *> (L, &PublicEditor::instance());
1617         lua_setglobal (L, "Editor");
1618 }
1619
1620 bool
1621 LuaCallback::lua_slot (std::string& name, std::string& script, ActionHook& ah, ARDOUR::LuaScriptParamList& args)
1622 {
1623         // TODO consolidate w/ LuaInstance::lua_action()
1624         try {
1625                 luabridge::LuaRef ref = (*_lua_get)();
1626                 if (ref.isNil()) {
1627                         return false;
1628                 }
1629                 if (!ref["name"].isString()) {
1630                         return false;
1631                 }
1632                 if (!ref["script"].isString()) {
1633                         return false;
1634                 }
1635                 if (!ref["args"].isTable()) {
1636                         return false;
1637                 }
1638
1639                 ah = _signals;
1640                 name = ref["name"].cast<std::string> ();
1641                 script = ref["script"].cast<std::string> ();
1642
1643                 args.clear();
1644                 LuaScriptInfoPtr lsi = LuaScripting::script_info (script);
1645                 if (!lsi) {
1646                         return false;
1647                 }
1648                 args = LuaScriptParams::script_params (lsi, "action_params");
1649                 luabridge::LuaRef rargs (ref["args"]);
1650                 LuaScriptParams::ref_to_params (args, &rargs);
1651                 return true;
1652         } catch (luabridge::LuaException const& e) {
1653                 cerr << "LuaException:" << e.what () << endl;
1654                 return false;
1655         }
1656         return false;
1657 }
1658
1659 void
1660 LuaCallback::set_session (ARDOUR::Session *s)
1661 {
1662         SessionHandlePtr::set_session (s);
1663
1664         if (!_session) {
1665                 return;
1666         }
1667
1668         lua_State* L = lua.getState();
1669         LuaBindings::set_session (L, _session);
1670
1671         reconnect();
1672 }
1673
1674 void
1675 LuaCallback::session_going_away ()
1676 {
1677         ENSURE_GUI_THREAD (*this, &LuaCallback::session_going_away);
1678         lua.do_command ("collectgarbage();");
1679
1680         SessionHandlePtr::session_going_away ();
1681         _session = 0;
1682
1683         drop_callback (); /* EMIT SIGNAL */
1684 }
1685
1686 void
1687 LuaCallback::reconnect ()
1688 {
1689         _connections.drop_connections ();
1690         if ((*_lua_get) ().isNil ()) {
1691                 drop_callback (); /* EMIT SIGNAL */
1692                 return;
1693         }
1694
1695         // TODO pass object which emits the signal (e.g region)
1696         //
1697         // save/load bound objects will be tricky.
1698         // Best idea so far is to save/lookup the PBD::ID
1699         // (either use boost::any indirection or templates for bindable
1700         // object types or a switch statement..)
1701         //
1702         // _session->route_by_id ()
1703         // _session->track_by_diskstream_id ()
1704         // _session->source_by_id ()
1705         // _session->controllable_by_id ()
1706         // _session->processor_by_id ()
1707         // RegionFactory::region_by_id ()
1708         //
1709         // TODO loop over objects (if any)
1710
1711         reconnect_object ((void*)0);
1712 }
1713
1714 template <class T> void
1715 LuaCallback::reconnect_object (T obj)
1716 {
1717         for (uint32_t i = 0; i < LuaSignal::LAST_SIGNAL; ++i) {
1718                 if (_signals[i]) {
1719 #define ENGINE(n,c,p) else if (i == LuaSignal::n) { connect_ ## p (LuaSignal::n, AudioEngine::instance(), &(AudioEngine::instance()->c)); }
1720 #define SESSION(n,c,p) else if (i == LuaSignal::n) { if (_session) { connect_ ## p (LuaSignal::n, _session, &(_session->c)); } }
1721 #define STATIC(n,c,p) else if (i == LuaSignal::n) { connect_ ## p (LuaSignal::n, obj, c); }
1722                         if (0) {}
1723 #                       include "luasignal_syms.h"
1724                         else {
1725                                 PBD::fatal << string_compose (_("programming error: %1: %2"), "Impossible LuaSignal type", i) << endmsg;
1726                                 abort(); /*NOTREACHED*/
1727                         }
1728 #undef ENGINE
1729 #undef SESSION
1730 #undef STATIC
1731                 }
1732         }
1733 }
1734
1735 template <typename T, typename S> void
1736 LuaCallback::connect_0 (enum LuaSignal::LuaSignal ls, T ref, S *signal) {
1737         signal->connect (
1738                         _connections, invalidator (*this),
1739                         boost::bind (&LuaCallback::proxy_0<T>, this, ls, ref),
1740                         gui_context());
1741 }
1742
1743 template <typename T, typename C1> void
1744 LuaCallback::connect_1 (enum LuaSignal::LuaSignal ls, T ref, PBD::Signal1<void, C1> *signal) {
1745         signal->connect (
1746                         _connections, invalidator (*this),
1747                         boost::bind (&LuaCallback::proxy_1<T, C1>, this, ls, ref, _1),
1748                         gui_context());
1749 }
1750
1751 template <typename T, typename C1, typename C2> void
1752 LuaCallback::connect_2 (enum LuaSignal::LuaSignal ls, T ref, PBD::Signal2<void, C1, C2> *signal) {
1753         signal->connect (
1754                         _connections, invalidator (*this),
1755                         boost::bind (&LuaCallback::proxy_2<T, C1, C2>, this, ls, ref, _1, _2),
1756                         gui_context());
1757 }
1758
1759 template <typename T> void
1760 LuaCallback::proxy_0 (enum LuaSignal::LuaSignal ls, T ref) {
1761         bool ok = true;
1762         {
1763                 const luabridge::LuaRef& rv ((*_lua_call)((int)ls, ref));
1764                 if (! rv.cast<bool> ()) {
1765                         ok = false;
1766                 }
1767         }
1768         /* destroy LuaRef ^^ first before calling drop_callback() */
1769         if (!ok) {
1770                 drop_callback (); /* EMIT SIGNAL */
1771         }
1772 }
1773
1774 template <typename T, typename C1> void
1775 LuaCallback::proxy_1 (enum LuaSignal::LuaSignal ls, T ref, C1 a1) {
1776         bool ok = true;
1777         {
1778                 const luabridge::LuaRef& rv ((*_lua_call)((int)ls, ref, a1));
1779                 if (! rv.cast<bool> ()) {
1780                         ok = false;
1781                 }
1782         }
1783         if (!ok) {
1784                 drop_callback (); /* EMIT SIGNAL */
1785         }
1786 }
1787
1788 template <typename T, typename C1, typename C2> void
1789 LuaCallback::proxy_2 (enum LuaSignal::LuaSignal ls, T ref, C1 a1, C2 a2) {
1790         bool ok = true;
1791         {
1792                 const luabridge::LuaRef& rv ((*_lua_call)((int)ls, ref, a1, a2));
1793                 if (! rv.cast<bool> ()) {
1794                         ok = false;
1795                 }
1796         }
1797         if (!ok) {
1798                 drop_callback (); /* EMIT SIGNAL */
1799         }
1800 }