libchimara/chimara-glk.c

   1 /* licensing and copyright information here */
   2
   3 #include <math.h>
   4 #include <gtk/gtk.h>
   5 #include <config.h>
   6 #include <glib/gi18n-lib.h>
   7 #include <gmodule.h>
   8 #include <pango/pango.h>
   9 #include "chimara-glk.h"
  10 #include "chimara-glk-private.h"
  11 #include "chimara-marshallers.h"
  12 #include "glk.h"
  13 #include "abort.h"
  14 #include "window.h"
  15 #include "glkstart.h"
  16 #include "glkunix.h"
  17 #include "init.h"
  18
  19 #define CHIMARA_GLK_MIN_WIDTH 0
  20 #define CHIMARA_GLK_MIN_HEIGHT 0
  21
  22 /**
  23  * SECTION:chimara-glk
  24  * @short_description: Widget which executes a Glk program
  25  * @stability: Unstable
  26  * @include: chimara/chimara-glk.h
  27  *
  28  * The ChimaraGlk widget opens and runs a Glk program. The program must be
  29  * compiled as a plugin module, with a function <function>glk_main()</function>
  30  * that the Glk library can hook into.
  31  *
  32  * On Linux systems, this is a file with a name like
  33  * <filename>plugin.so</filename>. For portability, you can use libtool and
  34  * automake:
  35  * |[
  36  * pkglib_LTLIBRARIES = plugin.la
  37  * plugin_la_SOURCES = plugin.c foo.c bar.c
  38  * plugin_la_LDFLAGS = -module -shared -avoid-version -export-symbols-regex "^glk_main$$"
  39  * ]|
  40  * This will produce <filename>plugin.la</filename> which is a text file
  41  * containing the correct plugin file to open (see the relevant section of the
  42  * <ulink
  43  * url="http://www.gnu.org/software/libtool/manual/html_node/Finding-the-dlname.html">
  44  * Libtool manual</ulink>).
  45  */
  46
  47 typedef void (* glk_main_t) (void);
  48 typedef int (* glkunix_startup_code_t) (glkunix_startup_t*);
  49
  50 enum {
  51     PROP_0,
  52     PROP_INTERACTIVE,
  53     PROP_PROTECT,
  54         PROP_DEFAULT_FONT_DESCRIPTION,
  55         PROP_MONOSPACE_FONT_DESCRIPTION,
  56         PROP_SPACING
  57 };
  58
  59 enum {
  60         STOPPED,
  61         STARTED,
  62         WAITING,
  63         CHAR_INPUT,
  64         LINE_INPUT,
  65         TEXT_BUFFER_OUTPUT,
  66
  67         LAST_SIGNAL
  68 };
  69
  70 static guint chimara_glk_signals[LAST_SIGNAL] = { 0 };
  71
  72 G_DEFINE_TYPE(ChimaraGlk, chimara_glk, GTK_TYPE_CONTAINER);
  73
  74 static void
  75 chimara_glk_init(ChimaraGlk *self)
  76 {
  77     GTK_WIDGET_SET_FLAGS(GTK_WIDGET(self), GTK_NO_WINDOW);
  78
  79     ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(self);
  80
  81     priv->self = self;
  82     priv->interactive = TRUE;
  83     priv->protect = FALSE;
  84         priv->default_font_desc = pango_font_description_from_string("Sans");
  85         priv->monospace_font_desc = pango_font_description_from_string("Monospace");
  86         priv->css_file = "style.css";
  87         priv->default_styles = g_hash_table_new(g_str_hash, g_str_equal);
  88     priv->program = NULL;
  89     priv->thread = NULL;
  90     priv->event_queue = NULL;
  91     priv->event_lock = NULL;
  92     priv->event_queue_not_empty = NULL;
  93     priv->event_queue_not_full = NULL;
  94     priv->abort_lock = NULL;
  95     priv->abort_signalled = FALSE;
  96         priv->arrange_lock = NULL;
  97         priv->rearranged = NULL;
  98         priv->needs_rearrange = FALSE;
  99         priv->ignore_next_arrange_event = FALSE;
 100     priv->interrupt_handler = NULL;
 101     priv->root_window = NULL;
 102     priv->fileref_list = NULL;
 103     priv->current_stream = NULL;
 104     priv->stream_list = NULL;
 105         priv->timer_id = 0;
 106         priv->in_startup = FALSE;
 107         priv->current_dir = NULL;
 108 }
 109
 110 static void
 111 chimara_glk_set_property(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
 112 {
 113     ChimaraGlk *glk = CHIMARA_GLK(object);
 114
 115     switch(prop_id)
 116     {
 117         case PROP_INTERACTIVE:
 118             chimara_glk_set_interactive( glk, g_value_get_boolean(value) );
 119             break;
 120         case PROP_PROTECT:
 121             chimara_glk_set_protect( glk, g_value_get_boolean(value) );
 122             break;
 123                 case PROP_DEFAULT_FONT_DESCRIPTION:
 124                         chimara_glk_set_default_font_description( glk, (PangoFontDescription *)g_value_get_pointer(value) );
 125                         break;
 126                 case PROP_MONOSPACE_FONT_DESCRIPTION:
 127                         chimara_glk_set_monospace_font_description( glk, (PangoFontDescription *)g_value_get_pointer(value) );
 128                         break;
 129                 case PROP_SPACING:
 130                         chimara_glk_set_spacing( glk, g_value_get_uint(value) );
 131                         break;
 132         default:
 133             G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
 134     }
 135 }
 136
 137 static void
 138 chimara_glk_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
 139 {
 140     ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(object);
 141
 142     switch(prop_id)
 143     {
 144         case PROP_INTERACTIVE:
 145             g_value_set_boolean(value, priv->interactive);
 146             break;
 147         case PROP_PROTECT:
 148             g_value_set_boolean(value, priv->protect);
 149             break;
 150                 case PROP_DEFAULT_FONT_DESCRIPTION:
 151                         g_value_set_pointer(value, priv->default_font_desc);
 152                         break;
 153                 case PROP_MONOSPACE_FONT_DESCRIPTION:
 154                         g_value_set_pointer(value, priv->monospace_font_desc);
 155                         break;
 156                 case PROP_SPACING:
 157                         g_value_set_uint(value, priv->spacing);
 158                         break;
 159         default:
 160             G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
 161     }
 162 }
 163
 164 static void
 165 chimara_glk_finalize(GObject *object)
 166 {
 167     ChimaraGlk *self = CHIMARA_GLK(object);
 168     ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(self);
 169
 170     /* Free the event queue */
 171     g_mutex_lock(priv->event_lock);
 172         g_queue_foreach(priv->event_queue, (GFunc)g_free, NULL);
 173         g_queue_free(priv->event_queue);
 174         g_cond_free(priv->event_queue_not_empty);
 175         g_cond_free(priv->event_queue_not_full);
 176         priv->event_queue = NULL;
 177         g_mutex_unlock(priv->event_lock);
 178         g_mutex_free(priv->event_lock);
 179
 180         /* Free the abort signalling mechanism */
 181         g_mutex_lock(priv->abort_lock);
 182         /* Make sure no other thread is busy with this */
 183         g_mutex_unlock(priv->abort_lock);
 184         g_mutex_free(priv->abort_lock);
 185         priv->abort_lock = NULL;
 186
 187         /* Free the window arrangement signalling */
 188         g_mutex_lock(priv->arrange_lock);
 189         g_cond_free(priv->rearranged);
 190         g_mutex_unlock(priv->arrange_lock);
 191         g_mutex_free(priv->arrange_lock);
 192         priv->arrange_lock = NULL;
 193
 194         /* Free private data */
 195         pango_font_description_free(priv->default_font_desc);
 196         pango_font_description_free(priv->monospace_font_desc);
 197         g_free(priv->current_dir);
 198         g_hash_table_destroy(priv->default_styles);
 199
 200     G_OBJECT_CLASS(chimara_glk_parent_class)->finalize(object);
 201 }
 202
 203 /* Internal function: Recursively get the Glk window tree's size request */
 204 static void
 205 request_recurse(winid_t win, GtkRequisition *requisition, guint spacing)
 206 {
 207         if(win->type == wintype_Pair)
 208         {
 209                 /* Get children's size requests */
 210                 GtkRequisition child1, child2;
 211                 request_recurse(win->window_node->children->data, &child1, spacing);
 212                 request_recurse(win->window_node->children->next->data, &child2, spacing);
 213
 214                 glui32 division = win->split_method & winmethod_DivisionMask;
 215                 glui32 direction = win->split_method & winmethod_DirMask;
 216
 217                 /* If the split is fixed, get the size of the fixed child */
 218                 if(division == winmethod_Fixed)
 219                 {
 220                         switch(direction)
 221                         {
 222                                 case winmethod_Left:
 223                                         child1.width = win->key_window?
 224                                                 win->constraint_size * win->key_window->unit_width
 225                                                 : 0;
 226                                         break;
 227                                 case winmethod_Right:
 228                                         child2.width = win->key_window?
 229                                                 win->constraint_size * win->key_window->unit_width
 230                                                 : 0;
 231                                         break;
 232                                 case winmethod_Above:
 233                                         child1.height = win->key_window?
 234                                                 win->constraint_size * win->key_window->unit_height
 235                                                 : 0;
 236                                         break;
 237                                 case winmethod_Below:
 238                                         child2.height = win->key_window?
 239                                                 win->constraint_size * win->key_window->unit_height
 240                                                 : 0;
 241                                         break;
 242                         }
 243                 }
 244
 245                 /* Add the children's requests */
 246                 switch(direction)
 247                 {
 248                         case winmethod_Left:
 249                         case winmethod_Right:
 250                                 requisition->width = child1.width + child2.width + spacing;
 251                                 requisition->height = MAX(child1.height, child2.height);
 252                                 break;
 253                         case winmethod_Above:
 254                         case winmethod_Below:
 255                                 requisition->width = MAX(child1.width, child2.width);
 256                                 requisition->height = child1.height + child2.height + spacing;
 257                                 break;
 258                 }
 259         }
 260
 261         /* For non-pair windows, just use the size that GTK requests */
 262         else
 263                 gtk_widget_size_request(win->frame, requisition);
 264 }
 265
 266 /* Overrides gtk_widget_size_request */
 267 static void
 268 chimara_glk_size_request(GtkWidget *widget, GtkRequisition *requisition)
 269 {
 270     g_return_if_fail(widget);
 271     g_return_if_fail(requisition);
 272     g_return_if_fail(CHIMARA_IS_GLK(widget));
 273
 274     ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(widget);
 275
 276     /* For now, just pass the size request on to the root Glk window */
 277     if(priv->root_window)
 278         {
 279                 request_recurse(priv->root_window->data, requisition, priv->spacing);
 280                 requisition->width += 2 * GTK_CONTAINER(widget)->border_width;
 281                 requisition->height += 2 * GTK_CONTAINER(widget)->border_width;
 282         }
 283         else
 284         {
 285         requisition->width = CHIMARA_GLK_MIN_WIDTH + 2 * GTK_CONTAINER(widget)->border_width;
 286         requisition->height = CHIMARA_GLK_MIN_HEIGHT + 2 * GTK_CONTAINER(widget)->border_width;
 287     }
 288 }
 289
 290 /* Recursively give the Glk windows their allocated space. Returns a window
 291  containing all children of this window that must be redrawn, or NULL if there
 292  are no children that require redrawing. */
 293 static winid_t
 294 allocate_recurse(winid_t win, GtkAllocation *allocation, guint spacing)
 295 {
 296         if(win->type == wintype_Pair)
 297         {
 298                 glui32 division = win->split_method & winmethod_DivisionMask;
 299                 glui32 direction = win->split_method & winmethod_DirMask;
 300
 301                 /* If the space gets too small to honor the spacing property, then just
 302                  ignore spacing in this window and below. */
 303                 if( (spacing > allocation->width && (direction == winmethod_Left || direction == winmethod_Right))
 304                    || (spacing > allocation->height && (direction == winmethod_Above || direction == winmethod_Below)) )
 305                         spacing = 0;
 306
 307                 GtkAllocation child1, child2;
 308                 child1.x = allocation->x;
 309                 child1.y = allocation->y;
 310
 311                 if(division == winmethod_Fixed)
 312                 {
 313                         /* If the key window has been closed, then default to 0; otherwise
 314                          use the key window to determine the size */
 315                         switch(direction)
 316                         {
 317                                 case winmethod_Left:
 318                                         child1.width = win->key_window?
 319                                                 CLAMP(win->constraint_size * win->key_window->unit_width, 0, allocation->width - spacing)
 320                                                 : 0;
 321                                         break;
 322                                 case winmethod_Right:
 323                                         child2.width = win->key_window?
 324                                                 CLAMP(win->constraint_size * win->key_window->unit_width, 0, allocation->width - spacing)
 325                                                 : 0;
 326                                         break;
 327                                 case winmethod_Above:
 328                                         child1.height = win->key_window?
 329                                                 CLAMP(win->constraint_size * win->key_window->unit_height, 0, allocation->height - spacing)
 330                                                 : 0;
 331                                         break;
 332                                 case winmethod_Below:
 333                                         child2.height = win->key_window?
 334                                                 CLAMP(win->constraint_size * win->key_window->unit_height, 0, allocation->height - spacing)
 335                                                 : 0;
 336                                         break;
 337                         }
 338                 }
 339                 else /* proportional */
 340                 {
 341                         gdouble fraction = win->constraint_size / 100.0;
 342                         switch(direction)
 343                         {
 344                                 case winmethod_Left:
 345                                         child1.width = MAX(0, (gint)ceil(fraction * (allocation->width - spacing)) );
 346                                         break;
 347                                 case winmethod_Right:
 348                                         child2.width = MAX(0, (gint)ceil(fraction * (allocation->width - spacing)) );
 349                                         break;
 350                                 case winmethod_Above:
 351                                         child1.height = MAX(0, (gint)ceil(fraction * (allocation->height - spacing)) );
 352                                         break;
 353                                 case winmethod_Below:
 354                                         child2.height = MAX(0, (gint)ceil(fraction * (allocation->height - spacing)) );
 355                                         break;
 356                         }
 357                 }
 358
 359                 /* Fill in the rest of the size requisitions according to the child specified above */
 360                 switch(direction)
 361                 {
 362                         case winmethod_Left:
 363                                 child2.width = MAX(0, allocation->width - spacing - child1.width);
 364                                 child2.x = child1.x + child1.width + spacing;
 365                                 child2.y = child1.y;
 366                                 child1.height = child2.height = allocation->height;
 367                                 break;
 368                         case winmethod_Right:
 369                                 child1.width = MAX(0, allocation->width - spacing - child2.width);
 370                                 child2.x = child1.x + child1.width + spacing;
 371                                 child2.y = child1.y;
 372                                 child1.height = child2.height = allocation->height;
 373                                 break;
 374                         case winmethod_Above:
 375                                 child2.height = MAX(0, allocation->height - spacing - child1.height);
 376                                 child2.x = child1.x;
 377                                 child2.y = child1.y + child1.height + spacing;
 378                                 child1.width = child2.width = allocation->width;
 379                                 break;
 380                         case winmethod_Below:
 381                                 child1.height = MAX(0, allocation->height - spacing - child2.height);
 382                                 child2.x = child1.x;
 383                                 child2.y = child1.y + child1.height + spacing;
 384                                 child1.width = child2.width = allocation->width;
 385                                 break;
 386                 }
 387
 388                 /* Recurse */
 389                 winid_t arrange1 = allocate_recurse(win->window_node->children->data, &child1, spacing);
 390                 winid_t arrange2 = allocate_recurse(win->window_node->children->next->data, &child2, spacing);
 391                 if(arrange1 == NULL)
 392                         return arrange2;
 393                 if(arrange2 == NULL)
 394                         return arrange1;
 395                 return win;
 396         }
 397
 398         else if(win->type == wintype_TextGrid)
 399         {
 400                 /* Pass the size allocation on to the framing widget */
 401                 gtk_widget_size_allocate(win->frame, allocation);
 402                 /* It says in the spec that when a text grid window is resized smaller,
 403                  the bottom or right area is thrown away; when it is resized larger, the
 404                  bottom or right area is filled with blanks. */
 405                 glui32 newwidth = (glui32)(win->widget->allocation.width / win->unit_width);
 406                 glui32 newheight = (glui32)(win->widget->allocation.height / win->unit_height);
 407                 gint line;
 408                 GtkTextBuffer *textbuffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
 409                 GtkTextIter start, end;
 410
 411                 for(line = 0; line < win->height; line++)
 412                 {
 413                         gtk_text_buffer_get_iter_at_line(textbuffer, &start, line);
 414                         /* If this line is going to fall off the bottom, delete it */
 415                         if(line >= newheight)
 416                         {
 417                                 end = start;
 418                                 gtk_text_iter_forward_to_line_end(&end);
 419                                 gtk_text_iter_forward_char(&end);
 420                                 gtk_text_buffer_delete(textbuffer, &start, &end);
 421                                 break;
 422                         }
 423                         /* If this line is not long enough, add spaces on the end */
 424                         if(newwidth > win->width)
 425                         {
 426                                 gchar *spaces = g_strnfill(newwidth - win->width, ' ');
 427                                 gtk_text_iter_forward_to_line_end(&start);
 428                                 gtk_text_buffer_insert(textbuffer, &start, spaces, -1);
 429                                 g_free(spaces);
 430                         }
 431                         /* But if it's too long, delete characters from the end */
 432                         else if(newwidth < win->width)
 433                         {
 434                                 end = start;
 435                                 gtk_text_iter_forward_chars(&start, newwidth);
 436                                 gtk_text_iter_forward_to_line_end(&end);
 437                                 gtk_text_buffer_delete(textbuffer, &start, &end);
 438                         }
 439                         /* Note: if the widths are equal, do nothing */
 440                 }
 441                 /* Add blank lines if there aren't enough lines to fit the new size */
 442                 if(newheight > win->height)
 443                 {
 444                         gchar *blanks = g_strnfill(win->width, ' ');
 445                     gchar **blanklines = g_new0(gchar *, (newheight - win->height) + 1);
 446                     int count;
 447                     for(count = 0; count < newheight - win->height; count++)
 448                         blanklines[count] = blanks;
 449                     blanklines[newheight - win->height] = NULL;
 450                     gchar *text = g_strjoinv("\n", blanklines);
 451                     g_free(blanklines); /* not g_strfreev() */
 452                     g_free(blanks);
 453
 454                         gtk_text_buffer_get_end_iter(textbuffer, &start);
 455                         gtk_text_buffer_insert(textbuffer, &start, "\n", -1);
 456                     gtk_text_buffer_insert(textbuffer, &start, text, -1);
 457                     g_free(text);
 458                 }
 459
 460                 gboolean arrange = !(win->width == newwidth && win->height == newheight);
 461                 win->width = newwidth;
 462                 win->height = newheight;
 463                 return arrange? win : NULL;
 464         }
 465
 466         /* For non-pair, non-text-grid windows, just give them the size */
 467         gtk_widget_size_allocate(win->frame, allocation);
 468         return NULL;
 469 }
 470
 471 /* Overrides gtk_widget_size_allocate */
 472 static void
 473 chimara_glk_size_allocate(GtkWidget *widget, GtkAllocation *allocation)
 474 {
 475     g_return_if_fail(widget);
 476     g_return_if_fail(allocation);
 477     g_return_if_fail(CHIMARA_IS_GLK(widget));
 478
 479     ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(widget);
 480
 481     widget->allocation = *allocation;
 482
 483     if(priv->root_window) {
 484                 GtkAllocation child;
 485                 child.x = allocation->x + GTK_CONTAINER(widget)->border_width;
 486                 child.y = allocation->y + GTK_CONTAINER(widget)->border_width;
 487                 child.width = CLAMP(allocation->width - 2 * GTK_CONTAINER(widget)->border_width, 0, allocation->width);
 488                 child.height = CLAMP(allocation->height - 2 * GTK_CONTAINER(widget)->border_width, 0, allocation->height);
 489                 winid_t arrange = allocate_recurse(priv->root_window->data, &child, priv->spacing);
 490
 491                 /* arrange points to a window that contains all text grid and graphics
 492                  windows which have been resized */
 493                 g_mutex_lock(priv->arrange_lock);
 494                 if(!priv->ignore_next_arrange_event)
 495                 {
 496                         if(arrange)
 497                                 event_throw(CHIMARA_GLK(widget), evtype_Arrange, arrange == priv->root_window->data? NULL : arrange, 0, 0);
 498                 }
 499                 else
 500                         priv->ignore_next_arrange_event = FALSE;
 501                 priv->needs_rearrange = FALSE;
 502                 g_cond_signal(priv->rearranged);
 503                 g_mutex_unlock(priv->arrange_lock);
 504         }
 505 }
 506
 507 /* Recursively invoke callback() on the GtkWidget of each non-pair window in the tree */
 508 static void
 509 forall_recurse(winid_t win, GtkCallback callback, gpointer callback_data)
 510 {
 511         if(win->type == wintype_Pair)
 512         {
 513                 forall_recurse(win->window_node->children->data, callback, callback_data);
 514                 forall_recurse(win->window_node->children->next->data, callback, callback_data);
 515         }
 516         else
 517                 (*callback)(win->frame, callback_data);
 518 }
 519
 520 /* Overrides gtk_container_forall */
 521 static void
 522 chimara_glk_forall(GtkContainer *container, gboolean include_internals, GtkCallback callback, gpointer callback_data)
 523 {
 524     g_return_if_fail(container);
 525     g_return_if_fail(CHIMARA_IS_GLK(container));
 526
 527     ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(container);
 528
 529         /* All the children are "internal" */
 530         if(!include_internals)
 531                 return;
 532
 533     if(priv->root_window)
 534                 forall_recurse(priv->root_window->data, callback, callback_data);
 535 }
 536
 537 static void
 538 chimara_glk_stopped(ChimaraGlk *self)
 539 {
 540     ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(self);
 541
 542     /* Free the plugin */
 543         if( priv->program && !g_module_close(priv->program) )
 544             g_warning( "Error closing module: %s", g_module_error() );
 545 }
 546
 547 static void
 548 chimara_glk_started(ChimaraGlk *self)
 549 {
 550         /* TODO: Add default signal handler implementation here */
 551 }
 552
 553 static void
 554 chimara_glk_waiting(ChimaraGlk *self)
 555 {
 556         /* TODO: Add default signal handler */
 557 }
 558
 559 static void
 560 chimara_glk_char_input(ChimaraGlk *self, guint window_rock, guint keysym)
 561 {
 562         /* TODO: Add default signal handler */
 563 }
 564
 565 static void
 566 chimara_glk_line_input(ChimaraGlk *self, guint window_rock, gchar *text)
 567 {
 568         /* TODO: Add default signal handler */
 569 }
 570
 571 static void
 572 chimara_glk_text_buffer_output(ChimaraGlk *self, guint window_rock, gchar *text)
 573 {
 574         /* TODO: Add default signal handler */
 575 }
 576
 577 /* G_PARAM_STATIC_STRINGS only appeared in GTK 2.13.0 */
 578 #ifndef G_PARAM_STATIC_STRINGS
 579 #define G_PARAM_STATIC_STRINGS (G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK | G_PARAM_STATIC_BLURB)
 580 #endif
 581
 582 static void
 583 chimara_glk_class_init(ChimaraGlkClass *klass)
 584 {
 585     /* Override methods of parent classes */
 586     GObjectClass *object_class = G_OBJECT_CLASS(klass);
 587     object_class->set_property = chimara_glk_set_property;
 588     object_class->get_property = chimara_glk_get_property;
 589     object_class->finalize = chimara_glk_finalize;
 590
 591     GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
 592     widget_class->size_request = chimara_glk_size_request;
 593     widget_class->size_allocate = chimara_glk_size_allocate;
 594
 595     GtkContainerClass *container_class = GTK_CONTAINER_CLASS(klass);
 596     container_class->forall = chimara_glk_forall;
 597
 598     /* Signals */
 599     klass->stopped = chimara_glk_stopped;
 600     klass->started = chimara_glk_started;
 601     klass->waiting = chimara_glk_waiting;
 602     klass->char_input = chimara_glk_char_input;
 603     klass->line_input = chimara_glk_line_input;
 604     klass->text_buffer_output = chimara_glk_text_buffer_output;
 605     /**
 606      * ChimaraGlk::stopped:
 607      * @glk: The widget that received the signal
 608      *
 609      * The ::stopped signal is emitted when the a Glk program finishes
 610      * executing in the widget, whether it ended normally, or was interrupted.
 611      */
 612     chimara_glk_signals[STOPPED] = g_signal_new("stopped",
 613         G_OBJECT_CLASS_TYPE(klass), 0,
 614         /* FIXME: Should be G_SIGNAL_RUN_CLEANUP but that segfaults??! */
 615         G_STRUCT_OFFSET(ChimaraGlkClass, stopped), NULL, NULL,
 616                 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
 617         /**
 618          * ChimaraGlk::started:
 619          * @glk: The widget that received the signal
 620          *
 621          * The ::started signal is emitted when a Glk program starts executing in
 622          * the widget.
 623          */
 624         chimara_glk_signals[STARTED] = g_signal_new ("started",
 625                 G_OBJECT_CLASS_TYPE(klass), 0,
 626                 G_STRUCT_OFFSET(ChimaraGlkClass, started), NULL, NULL,
 627                 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
 628
 629         chimara_glk_signals[WAITING] = g_signal_new("waiting",
 630                 G_OBJECT_CLASS_TYPE(klass), 0,
 631                 G_STRUCT_OFFSET(ChimaraGlkClass, waiting), NULL, NULL,
 632                 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
 633
 634         chimara_glk_signals[CHAR_INPUT] = g_signal_new("char-input",
 635                 G_OBJECT_CLASS_TYPE(klass), 0,
 636                 G_STRUCT_OFFSET(ChimaraGlkClass, char_input), NULL, NULL,
 637                 chimara_marshal_VOID__UINT_UINT,
 638                 G_TYPE_NONE, 2, G_TYPE_UINT, G_TYPE_UINT);
 639
 640         chimara_glk_signals[LINE_INPUT] = g_signal_new("line-input",
 641                 G_OBJECT_CLASS_TYPE(klass), 0,
 642                 G_STRUCT_OFFSET(ChimaraGlkClass, line_input), NULL, NULL,
 643                 chimara_marshal_VOID__UINT_STRING,
 644                 G_TYPE_NONE, 2, G_TYPE_UINT, G_TYPE_STRING);
 645
 646         chimara_glk_signals[TEXT_BUFFER_OUTPUT] = g_signal_new("text-buffer-output",
 647                 G_OBJECT_CLASS_TYPE(klass), 0,
 648                 G_STRUCT_OFFSET(ChimaraGlkClass, text_buffer_output), NULL, NULL,
 649                 chimara_marshal_VOID__UINT_STRING,
 650                 G_TYPE_NONE, 2, G_TYPE_UINT, G_TYPE_STRING);
 651
 652     /* Properties */
 653     /**
 654      * ChimaraGlk:interactive:
 655      *
 656      * Sets whether the widget is interactive. A Glk widget is normally
 657      * interactive, but in non-interactive mode, keyboard and mouse input are
 658      * ignored and the Glk program is controlled by chimara_glk_feed_text().
 659      * <quote>More</quote> prompts when a lot of text is printed to a text
 660          * buffer are also disabled. This is typically used when you wish to control
 661          * an interpreter program by feeding it a predefined list of commands.
 662      */
 663     g_object_class_install_property( object_class, PROP_INTERACTIVE,
 664                 g_param_spec_boolean("interactive", _("Interactive"),
 665         _("Whether user input is expected in the Glk program"),
 666         TRUE,
 667         G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_LAX_VALIDATION | G_PARAM_STATIC_STRINGS) );
 668
 669         /**
 670      * ChimaraGlk:protect:
 671      *
 672      * Sets whether the Glk program is allowed to do file operations. In protect
 673      * mode, all file operations will fail.
 674      */
 675     g_object_class_install_property(object_class, PROP_PROTECT,
 676                 g_param_spec_boolean("protect", _("Protected"),
 677         _("Whether the Glk program is barred from doing file operations"),
 678         FALSE,
 679         G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_LAX_VALIDATION | G_PARAM_STATIC_STRINGS) );
 680
 681         /* We can't use G_PARAM_CONSTRUCT on these because then the constructor will
 682          initialize them with NULL */
 683         /**
 684          * ChimaraGlk:default-font-description:
 685          *
 686          * Pointer to a #PangoFontDescription describing the default proportional
 687          * font, to be used in text buffer windows for example.
 688          *
 689          * Default value: font description created from the string
 690          * <quote>Sans</quote>
 691          */
 692         g_object_class_install_property(object_class, PROP_DEFAULT_FONT_DESCRIPTION,
 693                 g_param_spec_pointer("default-font-description", _("Default Font"),
 694                 _("Font description of the default proportional font"),
 695                 G_PARAM_READWRITE | G_PARAM_LAX_VALIDATION | G_PARAM_STATIC_STRINGS) );
 696
 697         /**
 698          * ChimaraGlk:monospace-font-description:
 699          *
 700          * Pointer to a #PangoFontDescription describing the default monospace font,
 701          * to be used in text grid windows and %style_Preformatted, for example.
 702          *
 703          * Default value: font description created from the string
 704          * <quote>Monospace</quote>
 705          */
 706         g_object_class_install_property(object_class, PROP_MONOSPACE_FONT_DESCRIPTION,
 707                 g_param_spec_pointer("monospace-font-description", _("Monospace Font"),
 708                 _("Font description of the default monospace font"),
 709                 G_PARAM_READWRITE | G_PARAM_LAX_VALIDATION | G_PARAM_STATIC_STRINGS) );
 710
 711         /**
 712          * ChimaraGlk:spacing:
 713          *
 714          * The amount of space between the Glk windows.
 715          */
 716         g_object_class_install_property(object_class, PROP_SPACING,
 717                 g_param_spec_uint("spacing", _("Spacing"),
 718                 _("The amount of space between Glk windows"),
 719                 0, G_MAXUINT, 0,
 720                 G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_LAX_VALIDATION | G_PARAM_STATIC_STRINGS) );
 721
 722     /* Private data */
 723     g_type_class_add_private(klass, sizeof(ChimaraGlkPrivate));
 724 }
 725
 726 /* PUBLIC FUNCTIONS */
 727
 728 /**
 729  * chimara_glk_new:
 730  *
 731  * Creates and initializes a new #ChimaraGlk widget.
 732  *
 733  * Return value: a #ChimaraGlk widget, with a floating reference.
 734  */
 735 GtkWidget *
 736 chimara_glk_new(void)
 737 {
 738         /* This is a library entry point; initialize the library */
 739         chimara_init();
 740
 741     ChimaraGlk *self = CHIMARA_GLK(g_object_new(CHIMARA_TYPE_GLK, NULL));
 742     ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(self);
 743
 744     priv->event_queue = g_queue_new();
 745     priv->event_lock = g_mutex_new();
 746     priv->event_queue_not_empty = g_cond_new();
 747     priv->event_queue_not_full = g_cond_new();
 748     priv->abort_lock = g_mutex_new();
 749         priv->arrange_lock = g_mutex_new();
 750         priv->rearranged = g_cond_new();
 751
 752     return GTK_WIDGET(self);
 753 }
 754
 755 /**
 756  * chimara_glk_set_interactive:
 757  * @glk: a #ChimaraGlk widget
 758  * @interactive: whether the widget should expect user input
 759  *
 760  * Sets the #ChimaraGlk:interactive property of @glk.
 761  */
 762 void
 763 chimara_glk_set_interactive(ChimaraGlk *glk, gboolean interactive)
 764 {
 765     g_return_if_fail(glk || CHIMARA_IS_GLK(glk));
 766
 767     ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(glk);
 768     priv->interactive = interactive;
 769 }
 770
 771 /**
 772  * chimara_glk_get_interactive:
 773  * @glk: a #ChimaraGlk widget
 774  *
 775  * Returns whether @glk is interactive (expecting user input). See
 776  * #ChimaraGlk:interactive.
 777  *
 778  * Return value: %TRUE if @glk is interactive.
 779  */
 780 gboolean
 781 chimara_glk_get_interactive(ChimaraGlk *glk)
 782 {
 783     g_return_val_if_fail(glk || CHIMARA_IS_GLK(glk), FALSE);
 784
 785     ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(glk);
 786     return priv->interactive;
 787 }
 788
 789 /**
 790  * chimara_glk_set_protect:
 791  * @glk: a #ChimaraGlk widget
 792  * @protect: whether the widget should allow the Glk program to do file
 793  * operations
 794  *
 795  * Sets the #ChimaraGlk:protect property of @glk. In protect mode, the Glk
 796  * program is not allowed to do file operations.
 797  */
 798 void
 799 chimara_glk_set_protect(ChimaraGlk *glk, gboolean protect)
 800 {
 801     g_return_if_fail(glk || CHIMARA_IS_GLK(glk));
 802
 803     ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(glk);
 804     priv->protect = protect;
 805 }
 806
 807 /**
 808  * chimara_glk_get_protect:
 809  * @glk: a #ChimaraGlk widget
 810  *
 811  * Returns whether @glk is in protect mode (banned from doing file operations).
 812  * See #ChimaraGlk:protect.
 813  *
 814  * Return value: %TRUE if @glk is in protect mode.
 815  */
 816 gboolean
 817 chimara_glk_get_protect(ChimaraGlk *glk)
 818 {
 819     g_return_val_if_fail(glk || CHIMARA_IS_GLK(glk), FALSE);
 820
 821     ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(glk);
 822     return priv->protect;
 823 }
 824
 825 /**
 826  * chimara_glk_set_default_font_description:
 827  * @glk: a #ChimaraGlk widget
 828  * @font: a #PangoFontDescription
 829  *
 830  * Sets @glk's default proportional font. See
 831  * #ChimaraGlk:default-font-description.
 832  */
 833 void
 834 chimara_glk_set_default_font_description(ChimaraGlk *glk, PangoFontDescription *font)
 835 {
 836         g_return_if_fail(glk || CHIMARA_IS_GLK(glk));
 837         g_return_if_fail(font);
 838
 839         ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(glk);
 840         pango_font_description_free(priv->default_font_desc);
 841         priv->default_font_desc = pango_font_description_copy(font);
 842
 843         /* TODO: Apply the font description to all the windows and recalculate the sizes */
 844 }
 845
 846 /**
 847  * chimara_glk_set_default_font_string:
 848  * @glk: a #ChimaraGlk widget
 849  * @font: string representation of a font description
 850  *
 851  * Sets @glk's default proportional font according to the string @font, which
 852  * must be a string in the form <quote><replaceable>FAMILY-LIST</replaceable>
 853  * [<replaceable>STYLE-OPTIONS</replaceable>]
 854  * [<replaceable>SIZE</replaceable>]</quote>, such as <quote>Charter,Utopia
 855  * Italic 12</quote> or <quote>Sans</quote>. See
 856  * #ChimaraGlk:default-font-description.
 857  */
 858 void
 859 chimara_glk_set_default_font_string(ChimaraGlk *glk, const gchar *font)
 860 {
 861         g_return_if_fail(glk || CHIMARA_IS_GLK(glk));
 862         g_return_if_fail(font || *font);
 863
 864         PangoFontDescription *fontdesc = pango_font_description_from_string(font);
 865         g_return_if_fail(fontdesc);
 866
 867         ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(glk);
 868         pango_font_description_free(priv->default_font_desc);
 869         priv->default_font_desc = fontdesc;
 870
 871         /* TODO: Apply the font description to all the windows and recalculate the sizes */
 872 }
 873
 874 /**
 875  * chimara_glk_get_default_font_description:
 876  * @glk: a #ChimaraGlk widget
 877  *
 878  * Returns @glk's default proportional font.
 879  *
 880  * Return value: a newly-allocated #PangoFontDescription which must be freed
 881  * using pango_font_description_free(), or %NULL on error.
 882  */
 883 PangoFontDescription *
 884 chimara_glk_get_default_font_description(ChimaraGlk *glk)
 885 {
 886         g_return_val_if_fail(glk || CHIMARA_IS_GLK(glk), NULL);
 887
 888         ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(glk);
 889         return pango_font_description_copy(priv->default_font_desc);
 890 }
 891
 892 /**
 893  * chimara_glk_set_monospace_font_description:
 894  * @glk: a #ChimaraGlk widget
 895  * @font: a #PangoFontDescription
 896  *
 897  * Sets @glk's default monospace font. See
 898  * #ChimaraGlk:monospace-font-description.
 899  */
 900 void
 901 chimara_glk_set_monospace_font_description(ChimaraGlk *glk, PangoFontDescription *font)
 902 {
 903         g_return_if_fail(glk || CHIMARA_IS_GLK(glk));
 904         g_return_if_fail(font);
 905
 906         ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(glk);
 907         pango_font_description_free(priv->monospace_font_desc);
 908         priv->monospace_font_desc = pango_font_description_copy(font);
 909
 910         /* TODO: Apply the font description to all the windows and recalculate the sizes */
 911 }
 912
 913 /**
 914  * chimara_glk_set_monospace_font_string:
 915  * @glk: a #ChimaraGlk widget
 916  * @font: string representation of a font description
 917  *
 918  * Sets @glk's default monospace font according to the string @font, which must
 919  * be a string in the form <quote><replaceable>FAMILY-LIST</replaceable>
 920  * [<replaceable>STYLE-OPTIONS</replaceable>]
 921  * [<replaceable>SIZE</replaceable>]</quote>, such as <quote>Courier
 922  * Bold 12</quote> or <quote>Monospace</quote>. See
 923  * #ChimaraGlk:monospace-font-description.
 924  */
 925 void
 926 chimara_glk_set_monospace_font_string(ChimaraGlk *glk, const gchar *font)
 927 {
 928         g_return_if_fail(glk || CHIMARA_IS_GLK(glk));
 929         g_return_if_fail(font || *font);
 930
 931         PangoFontDescription *fontdesc = pango_font_description_from_string(font);
 932         g_return_if_fail(fontdesc);
 933
 934         ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(glk);
 935         pango_font_description_free(priv->monospace_font_desc);
 936         priv->monospace_font_desc = fontdesc;
 937
 938         /* TODO: Apply the font description to all the windows and recalculate the sizes */
 939 }
 940
 941 /**
 942  * chimara_glk_get_monospace_font_description:
 943  * @glk: a #ChimaraGlk widget
 944  *
 945  * Returns @glk's default monospace font.
 946  *
 947  * Return value: a newly-allocated #PangoFontDescription which must be freed
 948  * using pango_font_description_free(), or %NULL on error.
 949  */
 950 PangoFontDescription *
 951 chimara_glk_get_monospace_font_description(ChimaraGlk *glk)
 952 {
 953         g_return_val_if_fail(glk || CHIMARA_IS_GLK(glk), NULL);
 954
 955         ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(glk);
 956         return pango_font_description_copy(priv->monospace_font_desc);
 957 }
 958
 959 /**
 960  * chimara_glk_set_spacing:
 961  * @glk: a #ChimaraGlk widget
 962  * @spacing: the number of pixels to put between Glk windows
 963  *
 964  * Sets the #ChimaraGlk:spacing property of @glk, which is the border width in
 965  * pixels between Glk windows.
 966  */
 967 void
 968 chimara_glk_set_spacing(ChimaraGlk *glk, guint spacing)
 969 {
 970         g_return_if_fail( glk || CHIMARA_IS_GLK(glk) );
 971
 972         ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(glk);
 973         priv->spacing = spacing;
 974 }
 975
 976 /**
 977  * chimara_glk_get_spacing:
 978  * @glk: a #ChimaraGlk widget
 979  *
 980  * Gets the value set by chimara_glk_set_spacing().
 981  *
 982  * Return value: pixels of spacing between Glk windows
 983  */
 984 guint
 985 chimara_glk_get_spacing(ChimaraGlk *glk)
 986 {
 987         g_return_val_if_fail(glk || CHIMARA_IS_GLK(glk), 0);
 988
 989         ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(glk);
 990         return priv->spacing;
 991 }
 992
 993 struct StartupData {
 994         glk_main_t glk_main;
 995         glkunix_startup_code_t glkunix_startup_code;
 996         glkunix_startup_t args;
 997         ChimaraGlkPrivate *glk_data;
 998 };
 999
1000 /* glk_enter() is the actual function called in the new thread in which glk_main() runs.  */
1001 static gpointer
1002 glk_enter(struct StartupData *startup)
1003 {
1004         extern GPrivate *glk_data_key;
1005         g_private_set(glk_data_key, startup->glk_data);
1006
1007         /* Run startup function */
1008         if(startup->glkunix_startup_code) {
1009                 startup->glk_data->in_startup = TRUE;
1010                 int result = startup->glkunix_startup_code(&startup->args);
1011                 startup->glk_data->in_startup = FALSE;
1012
1013                 int i = 0;
1014                 while(i < startup->args.argc)
1015                         g_free(startup->args.argv[i++]);
1016                 g_free(startup->args.argv);
1017
1018                 if(!result)
1019                         return NULL;
1020         }
1021
1022         /* Run main function */
1023     g_signal_emit_by_name(startup->glk_data->self, "started");
1024         (startup->glk_main)();
1025         g_signal_emit_by_name(startup->glk_data->self, "stopped");
1026         g_slice_free(struct StartupData, startup);
1027         return NULL;
1028 }
1029
1030 /**
1031  * chimara_glk_run:
1032  * @glk: a #ChimaraGlk widget
1033  * @plugin: path to a plugin module compiled with <filename
1034  * class="header">glk.h</filename>
1035  * @argc: Number of command line arguments in @argv
1036  * @argv: Array of command line arguments to pass to the plugin
1037  * @error: location to store a <link linkend="glib-GError">GError</link>, or
1038  * %NULL
1039  *
1040  * Opens a Glk program compiled as a plugin. Sorts out its command line
1041  * arguments from #glkunix_arguments, calls its startup function
1042  * glkunix_startup_code(), and then calls its main function glk_main() in
1043  * a separate thread. On failure, returns %FALSE and sets @error.
1044  *
1045  * The plugin must at least export a glk_main() function; #glkunix_arguments and
1046  * glkunix_startup_code() are optional.
1047  *
1048  * Return value: %TRUE if the Glk program was started successfully.
1049  */
1050 gboolean
1051 chimara_glk_run(ChimaraGlk *glk, gchar *plugin, int argc, char *argv[], GError **error)
1052 {
1053     g_return_val_if_fail(glk || CHIMARA_IS_GLK(glk), FALSE);
1054     g_return_val_if_fail(plugin, FALSE);
1055
1056     ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(glk);
1057         struct StartupData *startup = g_slice_new0(struct StartupData);
1058
1059     /* Open the module to run */
1060     g_assert( g_module_supported() );
1061     priv->program = g_module_open(plugin, G_MODULE_BIND_LAZY);
1062
1063     if(!priv->program)
1064     {
1065         g_warning( "Error opening module: %s", g_module_error() );
1066         return FALSE;
1067     }
1068     if( !g_module_symbol(priv->program, "glk_main", (gpointer *) &startup->glk_main) )
1069     {
1070         g_warning( "Error finding glk_main(): %s", g_module_error() );
1071         return FALSE;
1072     }
1073
1074     if( g_module_symbol(priv->program, "glkunix_startup_code", (gpointer *) &startup->glkunix_startup_code) )
1075     {
1076                 glkunix_argumentlist_t *glkunix_arguments;
1077
1078                 if( !(g_module_symbol(priv->program, "glkunix_arguments", (gpointer *) &glkunix_arguments)
1079                           && parse_command_line(glkunix_arguments, argc, argv, &startup->args)) )
1080                 {
1081                         /* arguments could not be parsed, so create data ourselves */
1082                         startup->args.argc = 1;
1083                         startup->args.argv = g_new0(gchar *, 1);
1084                 }
1085
1086                 /* Set the program name */
1087                 startup->args.argv[0] = g_strdup(plugin);
1088     }
1089         startup->glk_data = priv;
1090
1091     /* Run in a separate thread */
1092         priv->thread = g_thread_create((GThreadFunc)glk_enter, startup, TRUE, error);
1093
1094         return !(priv->thread == NULL);
1095 }
1096
1097 /**
1098  * chimara_glk_stop:
1099  * @glk: a #ChimaraGlk widget
1100  *
1101  * Signals the Glk program running in @glk to abort. Note that if the program is
1102  * caught in an infinite loop in which glk_tick() is not called, this may not
1103  * work.
1104  */
1105 void
1106 chimara_glk_stop(ChimaraGlk *glk)
1107 {
1108     g_return_if_fail(glk || CHIMARA_IS_GLK(glk));
1109     /* TODO: check if glk is actually running a program */
1110         ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(glk);
1111         if(priv->abort_lock) {
1112                 g_mutex_lock(priv->abort_lock);
1113                 priv->abort_signalled = TRUE;
1114                 g_mutex_unlock(priv->abort_lock);
1115                 /* Stop blocking on the event queue condition */
1116                 event_throw(glk, evtype_Abort, NULL, 0, 0);
1117         }
1118 }
1119
1120 /**
1121  * chimara_glk_wait:
1122  * @glk: a #ChimaraGlk widget
1123  *
1124  * Holds up the main thread and waits for the Glk program running in @glk to
1125  * finish.
1126  */
1127 void
1128 chimara_glk_wait(ChimaraGlk *glk)
1129 {
1130     g_return_if_fail(glk || CHIMARA_IS_GLK(glk));
1131
1132     ChimaraGlkPrivate *priv = CHIMARA_GLK_PRIVATE(glk);
1133     g_thread_join(priv->thread);
1134 }