src/core/na-icontext.c

   1 /*
   2  * Nautilus-Actions
   3  * A Nautilus extension which offers configurable context menu actions.
   4  *
   5  * Copyright (C) 2005 The GNOME Foundation
   6  * Copyright (C) 2006, 2007, 2008 Frederic Ruaudel and others (see AUTHORS)
   7  * Copyright (C) 2009, 2010, 2011 Pierre Wieser and others (see AUTHORS)
   8  *
   9  * This Program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This Program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public
  20  * License along with this Library; see the file COPYING.  If not,
  21  * write to the Free Software Foundation, Inc., 59 Temple Place,
  22  * Suite 330, Boston, MA 02111-1307, USA.
  23  *
  24  * Authors:
  25  *   Frederic Ruaudel <grumz@grumz.net>
  26  *   Rodrigo Moya <rodrigo@gnome-db.org>
  27  *   Pierre Wieser <pwieser@trychlos.org>
  28  *   ... and many others (see AUTHORS)
  29  */
  30
  31 #ifdef HAVE_CONFIG_H
  32 #include <config.h>
  33 #endif
  34
  35 #include <dbus/dbus-glib.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <sys/types.h>
  39 #include <unistd.h>
  40 #include <glibtop/proclist.h>
  41 #include <glibtop/procstate.h>
  42
  43 #include <libnautilus-extension/nautilus-file-info.h>
  44
  45 #include <api/na-core-utils.h>
  46 #include <api/na-object-api.h>
  47
  48 #include "na-gnome-vfs-uri.h"
  49 #include "na-selected-info.h"
  50
  51 /* private interface data
  52  */
  53 struct _NAIContextInterfacePrivate {
  54         void *empty;                                            /* so that gcc -pedantic is happy */
  55 };
  56
  57 static gboolean st_initialized = FALSE;
  58 static gboolean st_finalized   = FALSE;
  59
  60 static GType    register_type( void );
  61 static void     interface_base_init( NAIContextInterface *klass );
  62 static void     interface_base_finalize( NAIContextInterface *klass );
  63
  64 static void     convert_allfiles_mimetype( NAIContext *context );
  65
  66 static gboolean v_is_candidate( NAIContext *object, guint target, GList *selection );
  67
  68 static gboolean is_candidate_for_target( const NAIContext *object, guint target, GList *files );
  69 static gboolean is_candidate_for_show_in( const NAIContext *object, guint target, GList *files );
  70 static gboolean is_candidate_for_try_exec( const NAIContext *object, guint target, GList *files );
  71 static gboolean is_candidate_for_show_if_registered( const NAIContext *object, guint target, GList *files );
  72 static gboolean is_candidate_for_show_if_true( const NAIContext *object, guint target, GList *files );
  73 static gboolean is_candidate_for_show_if_running( const NAIContext *object, guint target, GList *files );
  74 static gboolean is_candidate_for_mimetypes( const NAIContext *object, guint target, GList *files );
  75 static gboolean is_mimetype_of( const gchar *file_type, const gchar *group, const gchar *subgroup );
  76 static void     split_mimetype( const gchar *mimetype, gchar **group, gchar **subgroup );
  77 static gboolean is_candidate_for_basenames( const NAIContext *object, guint target, GList *files );
  78 static gboolean is_candidate_for_selection_count( const NAIContext *object, guint target, GList *files );
  79 static gboolean is_candidate_for_schemes( const NAIContext *object, guint target, GList *files );
  80 static gboolean is_compatible_scheme( const gchar *pattern, const gchar *scheme );
  81 static gboolean is_candidate_for_folders( const NAIContext *object, guint target, GList *files );
  82 static gboolean is_candidate_for_capabilities( const NAIContext *object, guint target, GList *files );
  83
  84 static gboolean is_valid_basenames( const NAIContext *object );
  85 static gboolean is_valid_mimetypes( const NAIContext *object );
  86 static gboolean is_valid_isfiledir( const NAIContext *object );
  87 static gboolean is_valid_schemes( const NAIContext *object );
  88 static gboolean is_valid_folders( const NAIContext *object );
  89
  90 static gboolean is_positive_assertion( const gchar *assertion );
  91
  92 /**
  93  * na_icontext_get_type:
  94  *
  95  * Returns: the #GType type of this interface.
  96  */
  97 GType
  98 na_icontext_get_type( void )
  99 {
 100         static GType type = 0;
 101
 102         if( !type ){
 103                 type = register_type();
 104         }
 105
 106         return( type );
 107 }
 108
 109 /*
 110  * na_icontext_register_type:
 111  *
 112  * Registers this interface.
 113  */
 114 static GType
 115 register_type( void )
 116 {
 117         static const gchar *thisfn = "na_icontext_register_type";
 118         GType type;
 119
 120         static const GTypeInfo info = {
 121                 sizeof( NAIContextInterface ),
 122                 ( GBaseInitFunc ) interface_base_init,
 123                 ( GBaseFinalizeFunc ) interface_base_finalize,
 124                 NULL,
 125                 NULL,
 126                 NULL,
 127                 0,
 128                 0,
 129                 NULL
 130         };
 131
 132         g_debug( "%s", thisfn );
 133
 134         type = g_type_register_static( G_TYPE_INTERFACE, "NAIContext", &info, 0 );
 135
 136         g_type_interface_add_prerequisite( type, G_TYPE_OBJECT );
 137
 138         return( type );
 139 }
 140
 141 static void
 142 interface_base_init( NAIContextInterface *klass )
 143 {
 144         static const gchar *thisfn = "na_icontext_interface_base_init";
 145
 146         if( !st_initialized ){
 147
 148                 g_debug( "%s: klass%p (%s)", thisfn, ( void * ) klass, G_OBJECT_CLASS_NAME( klass ));
 149
 150                 klass->private = g_new0( NAIContextInterfacePrivate, 1 );
 151
 152                 st_initialized = TRUE;
 153         }
 154 }
 155
 156 static void
 157 interface_base_finalize( NAIContextInterface *klass )
 158 {
 159         static const gchar *thisfn = "na_icontext_interface_base_finalize";
 160
 161         if( st_initialized && !st_finalized ){
 162
 163                 g_debug( "%s: klass=%p", thisfn, ( void * ) klass );
 164
 165                 st_finalized = TRUE;
 166
 167                 g_free( klass->private );
 168         }
 169 }
 170
 171 /**
 172  * na_icontext_is_candidate:
 173  * @context: a #NAIContext to be checked.
 174  * @target: the current target.
 175  * @selection: the currently selected items, as a #GList of NASelectedInfo items.
 176  *
 177  * Determines if the given object may be candidate to be displayed in
 178  * the Nautilus context menu, depending of the list of currently selected
 179  * items.
 180  *
 181  * This function is called by <methodname>build_nautilus_menus</methodname>
 182  * plugin function for each item found in NAPivot items list, and, when this
 183  * an action, for each profile of this action.
 184  *
 185  * Returns: %TRUE if this @context succeeds to all tests and is so a
 186  * valid candidate to be displayed in Nautilus context menu, %FALSE
 187  * else.
 188  *
 189  * Since: 2.30
 190  */
 191 gboolean
 192 na_icontext_is_candidate( const NAIContext *context, guint target, GList *selection )
 193 {
 194         static const gchar *thisfn = "na_icontext_is_candidate";
 195         gboolean is_candidate;
 196
 197         g_return_val_if_fail( NA_IS_ICONTEXT( context ), FALSE );
 198
 199         g_debug( "%s: object=%p (%s), target=%d, selection=%p (count=%d)",
 200                         thisfn, ( void * ) context, G_OBJECT_TYPE_NAME( context ), target, (void * ) selection, g_list_length( selection ));
 201
 202         is_candidate = v_is_candidate( NA_ICONTEXT( context ), target, selection );
 203
 204         if( is_candidate ){
 205                 is_candidate =
 206                                 is_candidate_for_target( context, target, selection ) &&
 207                                 is_candidate_for_show_in( context, target, selection ) &&
 208                                 is_candidate_for_try_exec( context, target, selection ) &&
 209                                 is_candidate_for_show_if_registered( context, target, selection ) &&
 210                                 is_candidate_for_show_if_true( context, target, selection ) &&
 211                                 is_candidate_for_show_if_running( context, target, selection ) &&
 212                                 is_candidate_for_mimetypes( context, target, selection ) &&
 213                                 is_candidate_for_basenames( context, target, selection ) &&
 214                                 is_candidate_for_selection_count( context, target, selection ) &&
 215                                 is_candidate_for_schemes( context, target, selection ) &&
 216                                 is_candidate_for_folders( context, target, selection ) &&
 217                                 is_candidate_for_capabilities( context, target, selection );
 218         }
 219
 220         return( is_candidate );
 221 }
 222
 223 /**
 224  * na_icontext_is_valid:
 225  * @context: the #NAObjectProfile to be checked.
 226  *
 227  * Returns: %TRUE if this @context is valid, %FALSE else.
 228  *
 229  * This function is part of <methodname>NAIDuplicable::check_status</methodname>
 230  * and is called by #NAIDuplicable objects which also implement #NAIContext
 231  * interface. It so doesn't make sense of asking the object for its
 232  * validity status as it has already been checked before calling the
 233  * function.
 234  *
 235  * Since: 2.30
 236  */
 237 gboolean
 238 na_icontext_is_valid( const NAIContext *context )
 239 {
 240         gboolean is_valid;
 241
 242         g_return_val_if_fail( NA_IS_ICONTEXT( context ), FALSE );
 243
 244         is_valid =
 245                 is_valid_basenames( context ) &&
 246                 is_valid_mimetypes( context ) &&
 247                 is_valid_isfiledir( context ) &&
 248                 is_valid_schemes( context ) &&
 249                 is_valid_folders( context );
 250
 251         return( is_valid );
 252 }
 253
 254 /**
 255  * na_icontext_is_all_mimetypes:
 256  * @context: the #NAIContext object to be checked.
 257  *
 258  * Returns: %TRUE if this @context is valid for all mimetypes, %FALSE else.
 259  *
 260  * Since: 2.30
 261  */
 262 gboolean
 263 na_icontext_is_all_mimetypes( const NAIContext *context )
 264 {
 265         gboolean is_all;
 266         GSList *mimetypes, *im;
 267
 268         g_return_val_if_fail( NA_IS_ICONTEXT( context ), FALSE );
 269
 270         is_all = TRUE;
 271         mimetypes = na_object_get_mimetypes( context );
 272
 273         for( im = mimetypes ; im ; im = im->next ){
 274                 if( !im->data || !strlen( im->data )){
 275                         continue;
 276                 }
 277                 const gchar *imtype = ( const gchar * ) im->data;
 278                 if( !strcmp( imtype, "*" ) ||
 279                         !strcmp( imtype, "*/*" ) ||
 280                         !strcmp( imtype, "all" ) ||
 281                         !strcmp( imtype, "all/*" ) ||
 282                         !strcmp( imtype, "all/all" )){
 283                                 continue;
 284                 }
 285                 is_all = FALSE;
 286                 break;
 287         }
 288
 289         na_core_utils_slist_free( mimetypes );
 290
 291         return( is_all );
 292 }
 293
 294 /**
 295  * na_icontext_read_done:
 296  * @context: the #NAIContext to be prepared.
 297  *
 298  * Prepares the specified #NAIContext just after it has been read.
 299  *
 300  * <itemizedlist>
 301  *   <listitem>
 302  *     <para>
 303  *       This converts a 'all/allfiles' mimetype to 'all/all' + 'file' scheme.
 304  *     </para>
 305  *   </listitem>
 306  *   <listitem>
 307  *     <para>
 308  *       This setup an internal flag when mimetypes is like 'all/all'
 309  *       in order to optimize computation time;
 310  *     </para>
 311  *   </listitem>
 312  * </itemizedlist>
 313  *
 314  * Since: 2.30
 315  */
 316 void
 317 na_icontext_read_done( NAIContext *context )
 318 {
 319         convert_allfiles_mimetype( context );
 320
 321         na_object_set_all_mimetypes( context, na_icontext_is_all_mimetypes( context ));
 322 }
 323
 324 /**
 325  * na_icontext_set_scheme:
 326  * @context: the #NAIContext to be updated.
 327  * @scheme: name of the scheme.
 328  * @selected: whether this scheme is candidate to this @context.
 329  *
 330  * Sets the status of a @scheme relative to this @context.
 331  *
 332  * Since: 2.30
 333  */
 334 void
 335 na_icontext_set_scheme( NAIContext *context, const gchar *scheme, gboolean selected )
 336 {
 337         GSList *schemes;
 338
 339         g_return_if_fail( NA_IS_ICONTEXT( context ));
 340
 341         schemes = na_object_get_schemes( context );
 342         schemes = na_core_utils_slist_setup_element( schemes, scheme, selected );
 343         na_object_set_schemes( context, schemes );
 344         na_core_utils_slist_free( schemes );
 345 }
 346
 347 /**
 348  * na_icontext_set_only_desktop:
 349  * @context: the #NAIContext to be updated.
 350  * @desktop: name of the desktop environment.
 351  * @selected: whether this @desktop is candidate to this @context.
 352  *
 353  * Sets the status of the @desktop relative to this @context for the OnlyShowIn list.
 354  *
 355  * Since: 2.30
 356  */
 357 void
 358 na_icontext_set_only_desktop( NAIContext *context, const gchar *desktop, gboolean selected )
 359 {
 360         GSList *desktops;
 361
 362         g_return_if_fail( NA_IS_ICONTEXT( context ));
 363
 364         desktops = na_object_get_only_show_in( context );
 365         desktops = na_core_utils_slist_setup_element( desktops, desktop, selected );
 366         na_object_set_only_show_in( context, desktops );
 367         na_core_utils_slist_free( desktops );
 368 }
 369
 370 /**
 371  * na_icontext_set_only_desktop:
 372  * @context: the #NAIContext to be updated.
 373  * @desktop: name of the desktop environment.
 374  * @selected: whether this @desktop is candidate to this @context.
 375  *
 376  * Sets the status of the @desktop relative to this @context for the NotShowIn list.
 377  *
 378  * Since: 2.30
 379  */
 380 void
 381 na_icontext_set_not_desktop( NAIContext *context, const gchar *desktop, gboolean selected )
 382 {
 383         GSList *desktops;
 384
 385         g_return_if_fail( NA_IS_ICONTEXT( context ));
 386
 387         desktops = na_object_get_not_show_in( context );
 388         desktops = na_core_utils_slist_setup_element( desktops, desktop, selected );
 389         na_object_set_not_show_in( context, desktops );
 390         na_core_utils_slist_free( desktops );
 391 }
 392
 393 /**
 394  * na_icontext_replace_folder:
 395  * @context: the #NAIContext to be updated.
 396  * @old: the old uri.
 397  * @new: the new uri.
 398  *
 399  * Replaces the @old URI by the @new one.
 400  *
 401  * Since: 2.30
 402  */
 403 void
 404 na_icontext_replace_folder( NAIContext *context, const gchar *old, const gchar *new )
 405 {
 406         GSList *folders;
 407
 408         g_return_if_fail( NA_IS_ICONTEXT( context ));
 409
 410         folders = na_object_get_folders( context );
 411         folders = na_core_utils_slist_remove_utf8( folders, old );
 412         folders = g_slist_append( folders, ( gpointer ) g_strdup( new ));
 413         na_object_set_folders( context, folders );
 414         na_core_utils_slist_free( folders );
 415 }
 416
 417 /*
 418  * Convert 'all/allfiles' mimetype to 'all/all' + 'file' scheme.
 419  * This takes into account
 420  * - all/allfiles, allfiles, allfiles/ * and allfiles/all
 421  * - negated assertions.
 422  */
 423 static void
 424 convert_allfiles_mimetype( NAIContext *context )
 425 {
 426         GSList *mimetypes, *im;
 427         GSList *schemes;
 428         gchar *tmp;
 429         gboolean modified;
 430
 431         modified = FALSE;
 432         mimetypes = na_object_get_mimetypes( context );
 433         schemes = na_object_get_schemes( context );
 434
 435         for( im = mimetypes ; im ; im = im->next ){
 436                 if( !im->data || !strlen( im->data )){
 437                         continue;
 438                 }
 439
 440                 gchar *imtype = ( gchar * ) im->data;
 441                 gboolean positive = is_positive_assertion( imtype );
 442                 guint i = ( positive ? 0 : 1 );
 443
 444                 if( !strcmp( imtype+i, "allfiles" ) ||
 445                         !strcmp( imtype+i, "allfiles/*" ) ||
 446                         !strcmp( imtype+i, "allfiles/all" ) ||
 447                         !strcmp( imtype+i, "all/allfiles" )){
 448
 449                                 g_free( im->data );
 450                                 im->data = g_strdup( "all/all" );
 451                                 tmp = g_strdup_printf( "%sfile", positive ? "" : "!" );
 452                                 schemes = g_slist_prepend( schemes, tmp );
 453                                 modified = TRUE;
 454                 }
 455         }
 456
 457         if( modified ){
 458                 na_object_set_mimetypes( context, mimetypes );
 459                 na_object_set_schemes( context, schemes );
 460         }
 461
 462         na_core_utils_slist_free( mimetypes );
 463         na_core_utils_slist_free( schemes );
 464 }
 465
 466 static gboolean
 467 v_is_candidate( NAIContext *context, guint target, GList *selection )
 468 {
 469         gboolean is_candidate;
 470
 471         is_candidate = TRUE;
 472
 473         if( NA_ICONTEXT_GET_INTERFACE( context )->is_candidate ){
 474                 is_candidate = NA_ICONTEXT_GET_INTERFACE( context )->is_candidate( context, target, selection );
 475         }
 476
 477         return( is_candidate );
 478 }
 479
 480 /*
 481  * whether the given NAIContext object is candidate for this target
 482  * target is context menu for location, context menu for selection or toolbar for location
 483  * only actions are concerned by this check
 484  */
 485 static gboolean
 486 is_candidate_for_target( const NAIContext *object, guint target, GList *files )
 487 {
 488         static const gchar *thisfn = "na_icontext_is_candidate_for_target";
 489         gboolean ok = TRUE;
 490
 491         if( NA_IS_OBJECT_ACTION( object )){
 492                 switch( target ){
 493                         case ITEM_TARGET_LOCATION:
 494                                 ok = na_object_is_target_location( object );
 495                                 break;
 496
 497                         case ITEM_TARGET_TOOLBAR:
 498                                 ok = na_object_is_target_toolbar( object );
 499                                 break;
 500
 501                         case ITEM_TARGET_SELECTION:
 502                                 ok = na_object_is_target_selection( object );
 503                                 break;
 504
 505                         case ITEM_TARGET_ANY:
 506                                 ok = TRUE;
 507                                 break;
 508
 509                         default:
 510                                 g_warning( "%s: unknonw target=%d", thisfn, target );
 511                                 ok = FALSE;
 512                 }
 513         }
 514
 515         if( !ok ){
 516                 g_debug( "%s: object is not candidate because target doesn't match (asked=%d)", thisfn, target );
 517                 /*na_object_dump( object );*/
 518         }
 519
 520         return( ok );
 521 }
 522
 523 /*
 524  * only show in / not show in
 525  * only one of these two data may be set
 526  */
 527 static gboolean
 528 is_candidate_for_show_in( const NAIContext *object, guint target, GList *files )
 529 {
 530         static const gchar *thisfn = "na_icontext_is_candidate_for_show_in";
 531         gboolean ok = TRUE;
 532         GSList *only_in = na_object_get_only_show_in( object );
 533         GSList *not_in = na_object_get_not_show_in( object );
 534         gchar *environment;
 535
 536         /* TODO: how-to get current running environment ? */
 537         environment = g_strdup( "GNOME" );
 538
 539         if( environment && strlen( environment )){
 540                 if( only_in && g_slist_length( only_in )){
 541                         ok = ( na_core_utils_slist_count( only_in, environment ) > 0 );
 542                 } else if( not_in && g_slist_length( not_in )){
 543                         ok = ( na_core_utils_slist_count( not_in, environment ) == 0 );
 544                 }
 545         }
 546
 547         if( !ok ){
 548                 gchar *only_str = na_core_utils_slist_to_text( only_in );
 549                 gchar *not_str = na_core_utils_slist_to_text( not_in );
 550                 g_debug( "%s: object is not candidate because OnlyShowIn=%s, NotShowIn=%s", thisfn, only_str, not_str );
 551                 g_free( not_str );
 552                 g_free( only_str );
 553         }
 554
 555         g_free( environment );
 556         na_core_utils_slist_free( not_in );
 557         na_core_utils_slist_free( only_in );
 558
 559         return( ok );
 560 }
 561
 562 /*
 563  * if the data is set, it should be the path of an executable file
 564  */
 565 static gboolean
 566 is_candidate_for_try_exec( const NAIContext *object, guint target, GList *files )
 567 {
 568         static const gchar *thisfn = "na_icontext_is_candidate_for_try_exec";
 569         gboolean ok = TRUE;
 570         GError *error = NULL;
 571         gchar *tryexec = na_object_get_try_exec( object );
 572
 573         if( tryexec && strlen( tryexec )){
 574                 ok = FALSE;
 575                 GFile *file = g_file_new_for_path( tryexec );
 576                 GFileInfo *info = g_file_query_info( file, G_FILE_ATTRIBUTE_ACCESS_CAN_EXECUTE, G_FILE_QUERY_INFO_NONE, NULL, &error );
 577                 if( error ){
 578                         g_debug( "%s: %s", thisfn, error->message );
 579                         g_error_free( error );
 580
 581                 } else {
 582                         ok = g_file_info_get_attribute_boolean( info, G_FILE_ATTRIBUTE_ACCESS_CAN_EXECUTE );
 583                 }
 584
 585                 if( info ){
 586                         g_object_unref( info );
 587                 }
 588
 589                 g_object_unref( file );
 590         }
 591
 592         if( !ok ){
 593                 g_debug( "%s: object is not candidate because TryExec=%s", thisfn, tryexec );
 594         }
 595
 596         g_free( tryexec );
 597
 598         return( ok );
 599 }
 600
 601 static gboolean
 602 is_candidate_for_show_if_registered( const NAIContext *object, guint target, GList *files )
 603 {
 604         static const gchar *thisfn = "na_icontext_is_candidate_for_show_if_registered";
 605         gboolean ok = TRUE;
 606         gchar *name = na_object_get_show_if_registered( object );
 607
 608         if( name && strlen( name )){
 609                 ok = FALSE;
 610                 GError *error = NULL;
 611                 DBusGConnection *connection = dbus_g_bus_get( DBUS_BUS_SESSION, &error );
 612
 613                 if( !connection ){
 614                         if( error ){
 615                                 g_warning( "%s: %s", thisfn, error->message );
 616                                 g_error_free( error );
 617                         }
 618
 619                 } else {
 620                         DBusGProxy *proxy = dbus_g_proxy_new_for_name( connection, name, NULL, NULL );
 621                         ok = ( proxy != NULL );
 622                         dbus_g_connection_unref( connection );
 623                 }
 624         }
 625
 626         if( !ok ){
 627                 g_debug( "%s: object is not candidate because ShowIfRegistered=%s", thisfn, name );
 628         }
 629
 630         g_free( name );
 631
 632         return( ok );
 633 }
 634
 635 static gboolean
 636 is_candidate_for_show_if_true( const NAIContext *object, guint target, GList *files )
 637 {
 638         static const gchar *thisfn = "na_icontext_is_candidate_for_show_if_true";
 639         gboolean ok = TRUE;
 640         gchar *command = na_object_get_show_if_true( object );
 641
 642         if( command && strlen( command )){
 643                 ok = FALSE;
 644                 gchar *stdout = NULL;
 645                 g_spawn_command_line_sync( command, &stdout, NULL, NULL, NULL );
 646
 647                 if( stdout && !strcmp( stdout, "true" )){
 648                         ok = TRUE;
 649                 }
 650
 651                 g_free( stdout );
 652         }
 653
 654         if( !ok ){
 655                 g_debug( "%s: object is not candidate because ShowIfTrue=%s", thisfn, command );
 656         }
 657
 658         g_free( command );
 659
 660         return( ok );
 661 }
 662
 663 static gboolean
 664 is_candidate_for_show_if_running( const NAIContext *object, guint target, GList *files )
 665 {
 666         static const gchar *thisfn = "na_icontext_is_candidate_for_show_if_running";
 667         gboolean ok = TRUE;
 668         gchar *searched;
 669         glibtop_proclist proclist;
 670         glibtop_proc_state procstate;
 671         pid_t *pid_list;
 672         guint i;
 673         gchar *running = na_object_get_show_if_running( object );
 674
 675         if( running && strlen( running )){
 676                 ok = FALSE;
 677                 searched = g_path_get_basename( running );
 678                 pid_list = glibtop_get_proclist( &proclist, GLIBTOP_KERN_PROC_ALL, 0 );
 679
 680                 for( i=0 ; i<proclist.number && !ok ; ++i ){
 681                         glibtop_get_proc_state( &procstate, pid_list[i] );
 682                         /*g_debug( "%s: i=%d, cmd=%s", thisfn, i, procstate.cmd );*/
 683                         if( strcmp( procstate.cmd, searched ) == 0 ){
 684                                 g_debug( "%s: i=%d, cmd=%s", thisfn, i, procstate.cmd );
 685                                 ok = TRUE;
 686                         }
 687                 }
 688
 689                 g_free( pid_list );
 690                 g_free( searched );
 691         }
 692
 693         if( !ok ){
 694                 g_debug( "%s: object is not candidate because ShowIfRunning=%s", thisfn, running );
 695         }
 696
 697         g_free( running );
 698
 699         return( ok );
 700 }
 701
 702 /*
 703  * object may embed a list of - possibly negated - mimetypes
 704  * each file of the selection must satisfy all conditions of this list
 705  * an empty list is considered the same as '*' or '* / *'
 706  *
 707  * most time, we will just have '*' - so try to optimize the code to
 708  * be as fast as possible when we don't filter on mimetype
 709  *
 710  * mimetypes are of type : "image/ *; !image/jpeg"
 711  * file mimetype must be compatible with at least one positive assertion
 712  * (they are ORed), while not being of any negative assertions (they are
 713  * ANDed)
 714  *
 715  * here, for each mimetype of the selection, do
 716  * . match is FALSE while this mimetype has not matched a positive assertion
 717  * . nomatch is FALSE while this mimetype has not matched a negative assertion
 718  * we are going to check each mimetype filter
 719  *  while we have not found a match among positive conditions (i.e. while !match)
 720  *  we have to check all negative conditions to verify that the current
 721  *  examined mimetype never match these
 722  */
 723 static gboolean
 724 is_candidate_for_mimetypes( const NAIContext *object, guint target, GList *files )
 725 {
 726         static const gchar *thisfn = "na_icontext_is_candidate_for_mimetypes";
 727         gboolean ok = TRUE;
 728         gboolean all = na_object_get_all_mimetypes( object );
 729
 730         g_debug( "%s: all=%s", thisfn, all ? "True":"False" );
 731
 732         if( !all ){
 733                 GSList *mimetypes = na_object_get_mimetypes( object );
 734                 GSList *im;
 735                 GList *it;
 736
 737                 for( it = files ; it && ok ; it = it->next ){
 738                         gchar *ftype, *fgroup, *fsubgroup;
 739                         gboolean match, positive;
 740
 741                         match = FALSE;
 742                         ftype = na_selected_info_get_mime_type( NA_SELECTED_INFO( it->data ));
 743
 744                         if( ftype ){
 745                                 split_mimetype( ftype, &fgroup, &fsubgroup );
 746
 747                                 for( im = mimetypes ; im && ok ; im = im->next ){
 748                                         const gchar *imtype = ( const gchar * ) im->data;
 749                                         positive = is_positive_assertion( imtype );
 750
 751                                         if( !positive || !match ){
 752                                                 if( is_mimetype_of( positive ? imtype : imtype+1, fgroup, fsubgroup )){
 753                                                         g_debug( "%s: condition=%s, positive=%s, ftype=%s, fgroup=%s, fsubgroup=%s, matched",
 754                                                                         thisfn, imtype, positive ? "True":"False", ftype, fgroup, fsubgroup );
 755                                                         if( positive ){
 756                                                                 match = TRUE;
 757                                                         } else {
 758                                                                 ok = FALSE;
 759                                                         }
 760                                                 }
 761                                         }
 762                                 }
 763
 764                                 if( !match ){
 765                                         gchar *mimetypes_str = na_core_utils_slist_to_text( mimetypes );
 766                                         g_debug( "%s: no positive match found for Mimetypes=%s", thisfn, mimetypes_str );
 767                                         g_free( mimetypes_str );
 768                                         ok = FALSE;
 769                                 }
 770
 771                         } else {
 772                                 gchar *uri = na_selected_info_get_uri( NA_SELECTED_INFO( it->data ));
 773                                 g_debug( "%s: null mimetype found for %s", thisfn, uri );
 774                                 g_free( uri );
 775                                 ok = FALSE;
 776                         }
 777
 778                         g_free( fsubgroup );
 779                         g_free( fgroup );
 780                         g_free( ftype );
 781                 }
 782
 783                 na_core_utils_slist_free( mimetypes );
 784         }
 785
 786         return( ok );
 787 }
 788
 789 /*
 790  * does the file fgroup/fsubgrop have a mimetype which is 'a sort of'
 791  *  mimetype specified one ?
 792  * for example, "image/jpeg" is clearly a sort of "image/ *"
 793  * but how to check to see if "msword/xml" is a sort of "application/xml" ??
 794  */
 795 static gboolean
 796 is_mimetype_of( const gchar *mimetype, const gchar *fgroup, const gchar *fsubgroup )
 797 {
 798         gboolean is_type_of;
 799         gchar *mgroup, *msubgroup;
 800
 801         if( !strcmp( mimetype, "*" ) || !strcmp( mimetype, "*/*" )){
 802                 return( TRUE );
 803         }
 804
 805         split_mimetype( mimetype, &mgroup, &msubgroup );
 806
 807         is_type_of = ( strcmp( fgroup, mgroup ) == 0 );
 808         if( is_type_of ){
 809                 if( strcmp( msubgroup, "*" ) != 0 ){
 810                         is_type_of = ( strcmp( fsubgroup, msubgroup ) == 0 );
 811                 }
 812         }
 813
 814         g_free( mgroup );
 815         g_free( msubgroup );
 816
 817         return( is_type_of );
 818 }
 819
 820 /*
 821  * split the given mimetype to its group and subgroup components
 822  */
 823 static void
 824 split_mimetype( const gchar *mimetype, gchar **group, gchar **subgroup )
 825 {
 826         GSList *slist = na_core_utils_slist_from_split( mimetype, "/" );
 827         GSList *is = slist;
 828         *group = g_strdup(( const gchar * ) is->data );
 829         is = is->next;
 830         *subgroup = g_strdup(( const gchar * ) is->data );
 831         na_core_utils_slist_free( slist );
 832 }
 833
 834 static gboolean
 835 is_candidate_for_basenames( const NAIContext *object, guint target, GList *files )
 836 {
 837         static const gchar *thisfn = "na_icontext_is_candidate_for_basenames";
 838         gboolean ok = TRUE;
 839         GSList *basenames = na_object_get_basenames( object );
 840
 841         if( basenames ){
 842                 if( strcmp( basenames->data, "*" ) != 0 || g_slist_length( basenames ) > 1 ){
 843                         gboolean matchcase = na_object_get_matchcase( object );
 844                         GSList *ib;
 845                         GList *it;
 846                         gchar *tmp;
 847
 848                         for( it = files ; it && ok ; it = it->next ){
 849                                 gchar *pattern, *bname, *bname_utf8;
 850                                 gboolean match, positive;
 851                                 gchar *pattern_utf8;
 852
 853                                 bname = na_selected_info_get_basename( NA_SELECTED_INFO( it->data ));
 854                                 bname_utf8 = g_filename_to_utf8( bname, -1, NULL, NULL, NULL );
 855                                 if( !matchcase ){
 856                                         tmp = g_ascii_strdown( bname_utf8, g_utf8_strlen( bname_utf8, -1 ));
 857                                         g_free( bname_utf8 );
 858                                         bname_utf8 = tmp;
 859                                 }
 860                                 match = FALSE;
 861
 862                                 for( ib = basenames ; ib && ok ; ib = ib->next ){
 863                                         pattern = matchcase ?
 864                                                 g_strdup(( gchar * ) ib->data ) :
 865                                                 g_ascii_strdown(( gchar * ) ib->data, strlen(( gchar * ) ib->data ));
 866                                         positive = is_positive_assertion( pattern );
 867                                         pattern_utf8 = g_filename_to_utf8( positive ? pattern : pattern+1, -1, NULL, NULL, NULL );
 868
 869                                         if( !positive || !match ){
 870                                                 if( g_pattern_match_simple( pattern_utf8, bname_utf8 )){
 871                                                         g_debug( "%s: condition=%s, positive=%s, basename=%s: matched",
 872                                                                         thisfn, pattern_utf8, positive ? "True":"False", bname_utf8 );
 873                                                         if( positive ){
 874                                                                 match = TRUE;
 875                                                         } else {
 876                                                                 ok = FALSE;
 877                                                         }
 878                                                 }
 879                                         }
 880
 881                                         g_free( pattern_utf8 );
 882                                         g_free( pattern );
 883                                 }
 884
 885                                 if( !match ){
 886                                         gchar *basenames_str = na_core_utils_slist_to_text( basenames );
 887                                         g_debug( "%s: no positive match found for Basenames=%s", thisfn, basenames_str );
 888                                         g_free( basenames_str );
 889                                         ok = FALSE;
 890                                 }
 891
 892                                 g_free( bname_utf8 );
 893                                 g_free( bname );
 894                         }
 895                 }
 896
 897                 na_core_utils_slist_free( basenames );
 898         }
 899
 900         return( ok );
 901 }
 902
 903 static gboolean
 904 is_candidate_for_selection_count( const NAIContext *object, guint target, GList *files )
 905 {
 906         static const gchar *thisfn = "na_icontext_is_candidate_for_selection_count";
 907         gboolean ok = TRUE;
 908         gint limit;
 909         guint count;
 910         gchar *selection_count = na_object_get_selection_count( object );
 911
 912         if( selection_count && strlen( selection_count )){
 913                 limit = atoi( selection_count+1 );
 914                 count = g_list_length( files );
 915                 ok = FALSE;
 916
 917                 switch( selection_count[0] ){
 918                         case '<':
 919                                 ok = ( count < limit );
 920                                 break;
 921                         case '=':
 922                                 ok = ( count == limit );
 923                                 break;
 924                         case '>':
 925                                 ok = ( count > limit );
 926                                 break;
 927                         default:
 928                                 break;
 929                 }
 930         }
 931
 932         if( !ok ){
 933                 g_debug( "%s: object is not candidate because SelectionCount=%s", thisfn, selection_count );
 934         }
 935
 936         g_free( selection_count );
 937
 938         return( ok );
 939 }
 940
 941 /*
 942  * it is likely that all selected items have the same scheme, because they
 943  * are all in the same location and the scheme mainly depends on location
 944  * so we have here a great possible optimization by only testing the
 945  * first selected item.
 946  * note that this optimization may be wrong, for example when ran from the
 947  * command-line with a random set of pseudo-selected items
 948  * so we take care of only checking _distincts_ schemes of provided selection
 949  * against schemes conditions.
 950  */
 951 static gboolean
 952 is_candidate_for_schemes( const NAIContext *object, guint target, GList *files )
 953 {
 954         static const gchar *thisfn = "na_icontext_is_candidate_for_schemes";
 955         gboolean ok = TRUE;
 956         GSList *schemes = na_object_get_schemes( object );
 957
 958         if( schemes ){
 959                 if( strcmp( schemes->data, "*" ) != 0 || g_slist_length( schemes ) > 1 ){
 960                         GSList *distincts = NULL;
 961                         GList *it;
 962
 963                         for( it = files ; it && ok ; it = it->next ){
 964                                 gchar *scheme = na_selected_info_get_uri_scheme( NA_SELECTED_INFO( it->data ));
 965
 966                                 if( na_core_utils_slist_count( distincts, scheme ) == 0 ){
 967                                         GSList *is;
 968                                         gchar *pattern;
 969                                         gboolean match, positive;
 970
 971                                         match = FALSE;
 972                                         distincts = g_slist_prepend( distincts, g_strdup( scheme ));
 973
 974                                         for( is = schemes ; is && ok ; is = is->next ){
 975                                                 pattern = ( gchar * ) is->data;
 976                                                 positive = is_positive_assertion( pattern );
 977
 978                                                 if( !positive || !match ){
 979                                                         if( is_compatible_scheme( positive ? pattern : pattern+1, scheme )){
 980                                                                 if( positive ){
 981                                                                         match = TRUE;
 982                                                                 } else {
 983                                                                         ok = FALSE;
 984                                                                 }
 985                                                         }
 986                                                 }
 987                                         }
 988
 989                                         ok &= match;
 990                                 }
 991
 992                                 g_free( scheme );
 993                         }
 994
 995                         na_core_utils_slist_free( distincts );
 996                 }
 997
 998                 if( !ok ){
 999                         gchar *schemes_str = na_core_utils_slist_to_text( schemes );
1000                         g_debug( "%s: object is not candidate because Schemes=%s", thisfn, schemes_str );
1001                         g_free( schemes_str );
1002                 }
1003
1004                 na_core_utils_slist_free( schemes );
1005         }
1006
1007         return( ok );
1008 }
1009
1010 static gboolean
1011 is_compatible_scheme( const gchar *pattern, const gchar *scheme )
1012 {
1013         gboolean compatible;
1014
1015         compatible = FALSE;
1016
1017         if( strcmp( pattern, "*" )){
1018                 compatible = TRUE;
1019         } else {
1020                 compatible = ( strcmp( pattern, scheme ) == 0 );
1021         }
1022
1023         return( compatible );
1024 }
1025
1026 /*
1027  * assumuing here the same sort of optimization than for schemes
1028  * i.e. we assume that all selected items are must probably located
1029  * in the same dirname
1030  * so we take care of only checking _distinct_ dirnames against folder
1031  * conditions
1032  */
1033 static gboolean
1034 is_candidate_for_folders( const NAIContext *object, guint target, GList *files )
1035 {
1036         static const gchar *thisfn = "na_icontext_is_candidate_for_folders";
1037         gboolean ok = TRUE;
1038         GSList *folders = na_object_get_folders( object );
1039
1040         if( folders ){
1041                 if( strcmp( folders->data, "/" ) != 0 || g_slist_length( folders ) > 1 ){
1042                         GSList *distincts = NULL;
1043                         GList *it;
1044
1045                         for( it = files ; it && ok ; it = it->next ){
1046                                 gchar *dirname = na_selected_info_get_dirname( NA_SELECTED_INFO( it->data ));
1047
1048                                 if( na_core_utils_slist_count( distincts, dirname ) == 0 ){
1049                                         g_debug( "%s: distinct dirname=%s", thisfn, dirname );
1050
1051                                         GSList *id;
1052                                         gchar *dirname_utf8, *pattern_utf8;
1053                                         const gchar *pattern;
1054                                         gboolean match, positive;
1055                                         gboolean has_pattern;
1056
1057                                         distincts = g_slist_prepend( distincts, g_strdup( dirname ));
1058                                         dirname_utf8 = g_filename_to_utf8( dirname, -1, NULL, NULL, NULL );
1059                                         match = FALSE;
1060
1061                                         for( id = folders ; id && ok ; id = id->next ){
1062                                                 pattern = ( const gchar * ) id->data;
1063                                                 positive = is_positive_assertion( pattern );
1064                                                 pattern_utf8 = g_filename_to_utf8( positive ? pattern : pattern+1, -1, NULL, NULL, NULL );
1065                                                 has_pattern = ( g_strstr_len( pattern_utf8, -1, "*" ) != NULL );
1066
1067                                                 if( !positive || !match ){
1068                                                         if(( has_pattern && g_pattern_match_simple( pattern_utf8, dirname_utf8 )) || g_str_has_prefix( dirname_utf8, pattern_utf8 )){
1069                                                                 g_debug( "%s: condition=%s, positive=%s: matched",
1070                                                                                 thisfn, pattern, positive ? "True":"False" );
1071                                                                 if( positive ){
1072                                                                         match = TRUE;
1073                                                                 } else {
1074                                                                         ok = FALSE;
1075                                                                 }
1076                                                         /*} else {
1077                                                                 g_debug( "%s: condition=%s, positive=%s: not matched",
1078                                                                                 thisfn, pattern_utf8, positive ? "True":"False" );*/
1079                                                         }
1080                                                 }
1081
1082                                                 g_free( pattern_utf8 );
1083                                         }
1084
1085                                         ok &= match;
1086
1087                                         g_free( dirname_utf8 );
1088                                 }
1089
1090                                 g_free( dirname );
1091                         }
1092
1093                         na_core_utils_slist_free( distincts );
1094                 }
1095
1096                 if( !ok ){
1097                         gchar *folders_str = na_core_utils_slist_to_text( folders );
1098                         g_debug( "%s: object is not candidate because Folders=%s", thisfn, folders_str );
1099                         g_free( folders_str );
1100                 }
1101
1102                 na_core_utils_slist_free( folders );
1103         }
1104
1105         return( ok );
1106 }
1107
1108 static gboolean
1109 is_candidate_for_capabilities( const NAIContext *object, guint target, GList *files )
1110 {
1111         static const gchar *thisfn = "na_icontext_is_candidate_for_capabilities";
1112         gboolean ok = TRUE;
1113         GSList *capabilities = na_object_get_capabilities( object );
1114
1115         if( capabilities ){
1116                 GSList *ic;
1117                 GList *it;
1118                 const gchar *cap;
1119                 gboolean match, positive;
1120
1121                 for( it = files ; it && ok ; it = it->next ){
1122                         for( ic = capabilities ; ic && ok ; ic = ic->next ){
1123                                 cap = ( const gchar * ) ic->data;
1124                                 positive = is_positive_assertion( cap );
1125                                 match = FALSE;
1126
1127                                 if( !strcmp( positive ? cap : cap+1, "Owner" )){
1128                                         match = na_selected_info_is_owner( NA_SELECTED_INFO( it->data ), getlogin());
1129
1130                                 } else if( !strcmp( positive ? cap : cap+1, "Readable" )){
1131                                         match = na_selected_info_is_readable( NA_SELECTED_INFO( it->data ));
1132
1133                                 } else if( !strcmp( positive ? cap : cap+1, "Writable" )){
1134                                         match = na_selected_info_is_writable( NA_SELECTED_INFO( it->data ));
1135
1136                                 } else if( !strcmp( positive ? cap : cap+1, "Executable" )){
1137                                         match = na_selected_info_is_executable( NA_SELECTED_INFO( it->data ));
1138
1139                                 } else if( !strcmp( positive ? cap : cap+1, "Local" )){
1140                                         match = na_selected_info_is_local( NA_SELECTED_INFO( it->data ));
1141
1142                                 } else {
1143                                         g_warning( "%s: unknown capability %s", thisfn, cap );
1144                                 }
1145
1146                                 ok &= (( positive && match ) || ( !positive && !match ));
1147                         }
1148                 }
1149
1150                 if( !ok ){
1151                         gchar *capabilities_str = na_core_utils_slist_to_text( capabilities );
1152                         g_debug( "%s: object is not candidate because Capabilities=%s", thisfn, capabilities_str );
1153                         g_free( capabilities_str );
1154                 }
1155
1156                 na_core_utils_slist_free( capabilities );
1157         }
1158
1159         return( ok );
1160 }
1161
1162 static gboolean
1163 is_valid_basenames( const NAIContext *object )
1164 {
1165         gboolean valid;
1166         GSList *basenames;
1167
1168         basenames = na_object_get_basenames( object );
1169         valid = basenames && g_slist_length( basenames ) > 0;
1170         na_core_utils_slist_free( basenames );
1171
1172         if( !valid ){
1173                 na_object_debug_invalid( object, "basenames" );
1174         }
1175
1176         return( valid );
1177 }
1178
1179 static gboolean
1180 is_valid_mimetypes( const NAIContext *object )
1181 {
1182         gboolean valid;
1183         GSList *mimetypes;
1184
1185         mimetypes = na_object_get_mimetypes( object );
1186         valid = mimetypes && g_slist_length( mimetypes ) > 0;
1187         na_core_utils_slist_free( mimetypes );
1188
1189         if( !valid ){
1190                 na_object_debug_invalid( object, "mimetypes" );
1191         }
1192
1193         return( valid );
1194 }
1195
1196 static gboolean
1197 is_valid_isfiledir( const NAIContext *object )
1198 {
1199         gboolean valid;
1200         gboolean isfile, isdir;
1201
1202         isfile = na_object_is_file( object );
1203         isdir = na_object_is_dir( object );
1204
1205         valid = isfile || isdir;
1206
1207         if( !valid ){
1208                 na_object_debug_invalid( object, "isfiledir" );
1209         }
1210
1211         return( valid );
1212 }
1213
1214 static gboolean
1215 is_valid_schemes( const NAIContext *object )
1216 {
1217         gboolean valid;
1218         GSList *schemes;
1219
1220         schemes = na_object_get_schemes( object );
1221         valid = schemes && g_slist_length( schemes ) > 0;
1222         na_core_utils_slist_free( schemes );
1223
1224         if( !valid ){
1225                 na_object_debug_invalid( object, "schemes" );
1226         }
1227
1228         return( valid );
1229 }
1230
1231 static gboolean
1232 is_valid_folders( const NAIContext *object )
1233 {
1234         gboolean valid;
1235         GSList *folders;
1236
1237         folders = na_object_get_folders( object );
1238         valid = folders && g_slist_length( folders ) > 0;
1239         na_core_utils_slist_free( folders );
1240
1241         if( !valid ){
1242                 na_object_debug_invalid( object, "folders" );
1243         }
1244
1245         return( valid );
1246 }
1247
1248 /*
1249  * "image/ *" is a positive assertion
1250  * "!image/jpeg" is a negative one
1251  */
1252 static gboolean
1253 is_positive_assertion( const gchar *assertion )
1254 {
1255         gboolean positive = TRUE;
1256
1257         if( assertion ){
1258                 gchar *dupped = g_strdup( assertion );
1259                 const gchar *stripped = g_strstrip( dupped );
1260                 if( stripped ){
1261                         positive = ( stripped[0] != '!' );
1262                 }
1263                 g_free( dupped );
1264         }
1265
1266         return( positive );
1267 }