[dia] Ooops: forgot diacontext.[hc]

[Hans Breuer <hans src gnome org>]

commit d80cf44fe2383c3f4961823fdb995c8b7699e5c4
Author: Hans Breuer <hans breuer org>
Date:   Sat Jul 21 18:20:41 2012 +0200

    Ooops: forgot diacontext.[hc]

 lib/Makefile.am  |    2 +
 lib/diacontext.c |  199 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/diacontext.h |   21 ++++++
 3 files changed, 222 insertions(+), 0 deletions(-)
---
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 1fca5ca..500a31a 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -184,6 +184,8 @@ libdia_la_SOURCES =  \
 		prefs.h \
 		dialib.c \
 		dialib.h \
+		diacontext.c \
+		diacontext.h \
 		\
 		diacellrendererproperty.c \
 		diacellrendererproperty.h \
diff --git a/lib/diacontext.c b/lib/diacontext.c
new file mode 100644
index 0000000..f214647
--- /dev/null
+++ b/lib/diacontext.c
@@ -0,0 +1,199 @@
+/* dia -- an diagram creation/manipulation program
+ * Copyright (C) 1998 Alexander Larsson
+ *
+ * diacontext.c -- 
+ *
+ * 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 Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+
+#include "diacontext.h"
+
+/* DiaContext should be used to
+ *  - let the caller decide about user notfication and not the callee
+ *  - help writing thread-aware library functions
+ *  - cleanup message_*() usage in dia/lib, dia/plug-ins and dia/objects
+ */
+
+#include <glib-object.h>
+#include <string.h>
+
+#include "message.h" /* just for testing */
+
+typedef struct _DiaContextClass DiaContextClass;
+#define DIA_TYPE_CONTEXT (dia_context_get_type ())
+GType dia_context_get_type (void) G_GNUC_CONST;
+
+struct _DiaContext
+{
+  GObject parent_instance;
+  /*< private >*/
+  gchar *desc;
+  gchar *filename;
+  GList *messages;
+};
+
+struct _DiaContextClass
+{
+  GObjectClass parent_class;
+};
+
+/* The use of GObject is intentionally hidden from the API */
+static void _dia_context_finalize   (GObject *object);
+
+G_DEFINE_TYPE (DiaContext, _dia_context, DIA_TYPE_CONTEXT);
+static gpointer parent_class = NULL;
+
+static void
+_dia_context_finalize(GObject *object)
+{
+  DiaContext *context = (DiaContext *)object;
+
+  g_list_foreach (context->messages, (GFunc) g_free, NULL);
+  g_free (context->desc);
+  g_free (context->filename);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+static void 
+_dia_context_class_init(DiaContextClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  parent_class = g_type_class_peek_parent (klass);
+  object_class->finalize = _dia_context_finalize;
+}
+static void 
+_dia_context_init(DiaContext *self)
+{
+  /* zero initialization should be right */
+}
+
+GType
+dia_context_get_type (void)
+{
+  static GType object_type = 0;
+
+  if (!object_type)
+    {
+      static const GTypeInfo object_info =
+      {
+        sizeof (DiaContextClass),
+        (GBaseInitFunc) NULL,
+        (GBaseFinalizeFunc) NULL,
+        (GClassInitFunc) _dia_context_class_init,
+        NULL,           /* class_finalize */
+        NULL,           /* class_data */
+        sizeof (DiaContext),
+        0,              /* n_preallocs */
+	NULL            /* init */
+      };
+
+      object_type = g_type_register_static (G_TYPE_OBJECT,
+                                            "DiaContext",
+                                            &object_info, 0);
+    }
+  
+  return object_type;
+}
+
+DiaContext *
+dia_context_new (const char *desc)
+{
+  DiaContext *context = g_object_new (DIA_TYPE_CONTEXT, NULL);
+  context->desc = g_strdup (desc);
+  return context;
+}
+
+void 
+dia_context_release (DiaContext *context)
+{
+  /* FIXME: this should vanish */
+  if (context->messages)
+    message_warning ("%s:\n%s", 
+                     context->desc ? context->desc : "<no context>",
+		     context->messages->data);
+
+  g_object_unref (G_OBJECT (context));
+}
+
+void 
+dia_context_set_filename (DiaContext *context, 
+			  const char *filename)
+{
+  g_return_if_fail (context != NULL);
+
+  if (context->filename)
+    g_free (context->filename);
+  context->filename = g_strdup (filename);
+}
+
+const char *
+dia_context_get_filename (DiaContext *context)
+{
+  g_return_val_if_fail (context != NULL && context->filename, "");
+
+  return context->filename;
+}
+
+void 
+dia_context_add_message (DiaContext *context, 
+			 const char *format, ...)
+{
+  gchar *msg;
+  va_list args;
+
+
+  g_return_if_fail (context != NULL);
+
+  g_return_if_fail (context != NULL);
+
+  va_start (args, format);
+
+  msg = g_strdup_vprintf (format, args);
+  va_end (args);
+  /* ToDo: dont repeat the same message over and over again, except ... */
+  
+  context->messages = g_list_prepend (context->messages, msg);
+}
+
+void 
+dia_context_add_message_with_errno (DiaContext *context, int nr,
+				    const char *format, ...)
+{
+  gchar *errstr;
+  gchar *msg;
+  va_list args;
+
+  g_return_if_fail (context != NULL);
+
+  va_start (args, format);
+
+  msg = g_strdup_vprintf (format, args);
+  va_end (args);
+
+  errstr = (nr == 0) ? NULL : g_locale_to_utf8 (strerror(nr), -1, NULL, NULL, NULL);
+  if (errstr) {
+    gchar *tmp = g_strdup_printf ("%s\n%s", msg, errstr);
+    
+    g_free (msg);
+    msg = tmp;
+  }
+  /* ToDo: dont repeat the same message over and over again, except ... */
+
+  context->messages = g_list_prepend (context->messages, msg);
+  g_free (errstr);
+}
diff --git a/lib/diacontext.h b/lib/diacontext.h
new file mode 100644
index 0000000..50da3f9
--- /dev/null
+++ b/lib/diacontext.h
@@ -0,0 +1,21 @@
+#ifndef DIA_CONTEXT_H
+#define DIA_CONTEXT_H
+
+#include "diatypes.h"
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+DiaContext *dia_context_new (const char *desc);
+void dia_context_release (DiaContext *context);
+
+void dia_context_set_filename (DiaContext *context, const char *filename);
+void dia_context_add_message (DiaContext *context, const char *fomat, ...);
+void dia_context_add_message_with_errno (DiaContext *context, int nr, const char *fomat, ...);
+
+const char *dia_context_get_filename (DiaContext *context);
+
+G_END_DECLS
+
+
+#endif /* DIA_CONTEXT_H */