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diff --git a/mail/em-format-hook.h b/mail/em-format-hook.h
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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
+ *
+ *  Authors: Michel Zucchi <notzed@ximian.com>
+ *
+ *  Copyright 2003 Ximian, Inc. (www.ximian.com)
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#ifndef __EM_FORMAT_HOOK_H__
+#define __EM_FORMAT_HOOK_H__
+
+#include <glib-object.h>
+#include "e-util/e-msgport.h"
+#include "e-util/e-plugin.h"
+
+#include "em-format.h"
+
+#ifdef __cplusplus
+extern "C" {
+#pragma }
+#endif /* __cplusplus */
+
+typedef struct _EMFormatHookItem EMFormatHookItem;
+typedef struct _EMFormatHookGroup EMFormatHookGroup;
+typedef struct _EMFormatHook EMFormatHook;
+typedef struct _EMFormatHookClass EMFormatHookClass;
+
+typedef struct _EMFormatHookTarget EMFormatHookTarget;
+
+typedef void (*EMFormatHookFunc)(struct _EPlugin *plugin, EMFormatHookTarget *data);
+
+struct _EMFormatHookTarget {
+	struct _EMFormat *format;
+	struct _CamelStream *stream;
+	struct _CamelMimePart *part;
+	struct _EMFormatHookItem *item;
+};
+
+struct _EMFormatHookItem {
+	EMFormatHandler handler;
+
+	struct _EMFormatHook *hook; /* parent pointer */
+	char *format;		/* format handler */
+};
+
+struct _EMFormatHookGroup {
+	struct _EMFormatHook *hook; /* parent pointer */
+	char *id;		/* target formatter id */
+	GSList *items;		/* items to consider */
+};
+
+/**
+ * struct _EMFormatHook - Mail formatter hook.
+ * 
+ * @hook: 
+ * @groups: 
+ *
+ * The Mail formatter hook links all of the plugin formatter hooks
+ * into the relevent formatter classes.
+ **/
+struct _EMFormatHook {
+	EPluginHook hook;
+
+	GSList *groups;
+};
+
+struct _EMFormatHookClass {
+	EPluginHookClass hook_class;
+
+	/* which class to add matching items to */
+	GHashTable *format_classes;
+};
+
+GType em_format_hook_get_type(void);
+
+/* register a type as a possible formatter hook point */
+void em_format_hook_register_type(GType type);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __EM_FORMAT_HOOK_H__ */