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hooks.c (3291B)

      1 /*
      2  * Claws Mail -- a GTK based, lightweight, and fast e-mail client
      3  * Copyright (C) 1999-2024 the Claws Mail team
      4  *
      5  * This program is free software; you can redistribute it and/or modify
      6  * it under the terms of the GNU General Public License as published by
      7  * the Free Software Foundation; either version 3 of the License, or
      8  * (at your option) any later version.
      9  *
     10  * This program is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     13  * GNU General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU General Public License
     16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
     17  */
     18 
     19 #include <glib.h>
     20 
     21 #include "utils.h"
     22 #include "hooks.h"
     23 
     24 static GHashTable *hooklist_table;
     25 
     26 static GHookList *hooks_get_hooklist(const gchar *hooklist_name)
     27 {
     28 	GHookList *hooklist;
     29 
     30 	if (hooklist_table == NULL)
     31 		hooklist_table = g_hash_table_new(g_str_hash, g_str_equal);
     32 
     33 	hooklist = (GHookList *) g_hash_table_lookup(hooklist_table, hooklist_name);
     34 	if (hooklist != NULL)
     35 		return hooklist;
     36 
     37 	hooklist = g_new0(GHookList, 1);
     38 	g_hook_list_init(hooklist, sizeof(GHook));
     39 	g_hash_table_insert(hooklist_table, g_strdup(hooklist_name), hooklist);
     40 
     41 	return hooklist;
     42 }
     43 
     44 gulong hooks_register_hook(const gchar *hooklist_name,
     45 			  ClawsMailHookFunction hook_func,
     46 			  gpointer userdata)
     47 {
     48 	GHookList *hooklist;
     49 	GHook *hook;
     50 
     51 	cm_return_val_if_fail(hooklist_name != NULL, HOOK_NONE);
     52 	cm_return_val_if_fail(hook_func != NULL, HOOK_NONE);
     53 
     54 	hooklist = hooks_get_hooklist(hooklist_name);
     55 	cm_return_val_if_fail(hooklist != NULL, HOOK_NONE);
     56 
     57 	hook = g_hook_alloc(hooklist);
     58 	cm_return_val_if_fail(hook != NULL, HOOK_NONE);
     59 
     60 	hook->func = hook_func;
     61 	hook->data = userdata;
     62 
     63 	g_hook_append(hooklist, hook);
     64 
     65 	debug_print("registered new hook for '%s' as id %lu\n", hooklist_name, hook->hook_id);
     66 	if (hook->hook_id == HOOK_NONE)
     67 		g_error("unexpected hook ID 0");
     68 
     69 	return hook->hook_id;
     70 }
     71 
     72 void hooks_unregister_hook(const gchar *hooklist_name,
     73 			   gulong hook_id)
     74 {
     75 	GHookList *hooklist;
     76 	GHook *hook;
     77 
     78 	cm_return_if_fail(hooklist_name != NULL);
     79 
     80 	hooklist = hooks_get_hooklist(hooklist_name);
     81 	cm_return_if_fail(hooklist != NULL);
     82 
     83 	hook = g_hook_get(hooklist, hook_id);
     84 	cm_return_if_fail(hook != NULL);
     85 
     86 	debug_print("unregistered hook %lu in '%s'\n", hook->hook_id, hooklist_name);
     87 
     88 	g_hook_destroy(hooklist, hook_id);
     89 }
     90 
     91 struct MarshalData
     92 {
     93 	gpointer	source;
     94 	gboolean	abort;
     95 };
     96 
     97 static void hooks_marshal(GHook *hook, gpointer data)
     98 {
     99 	gboolean (*func) (gpointer source, gpointer data);
    100 	struct MarshalData *marshal_data = (struct MarshalData *)data;
    101 
    102 	if (!marshal_data->abort) {
    103 		func = hook->func;
    104 		marshal_data->abort = func(marshal_data->source, hook->data);
    105 	}
    106 }
    107 
    108 gboolean hooks_invoke(const gchar *hooklist_name,
    109 		  gpointer source)
    110 {
    111 	GHookList *hooklist;
    112 	struct MarshalData marshal_data;
    113 
    114 	cm_return_val_if_fail(hooklist_name != NULL, FALSE);
    115 
    116 	hooklist = hooks_get_hooklist(hooklist_name);
    117 	cm_return_val_if_fail(hooklist != NULL, FALSE);
    118 
    119 	marshal_data.source = source;
    120 	marshal_data.abort = FALSE;
    121 
    122 	g_hook_list_marshal(hooklist, TRUE, hooks_marshal, &marshal_data);
    123 
    124 	return marshal_data.abort;
    125 }