+ * camel/camel-formatter.c: By looking up a mimetype in a

+	hashtable, we can now get a handler function for an arbitrary
+	mimetype.

svn path=/trunk/; revision=1641

3 files changed, 165 insertions, 50 deletions

diff --git a/ChangeLog b/ChangeLog
index bb97290b82..0167744809 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2000-01-26  Matt Loper  <matt.loper@splashtech.com>
+
+	* camel/camel-formatter.c: By looking up a mimetype in a
+	hashtable, we can now get a handler function for an arbitrary
+	mimetype.
+
 2000-01-26  bertrand  <bertrand@helixcode.com>
 
 	* widgets/shortcut-bar/e-icon-bar.c (e_icon_bar_recalc_item_positions): 
diff --git a/camel/camel-formatter.c b/camel/camel-formatter.c
index fec74db7e2..ae426c2e63 100644
--- a/camel/camel-formatter.c
+++ b/camel/camel-formatter.c
@@ -32,6 +32,8 @@ struct _CamelFormatterPrivate {
 	/* nothing here yet */
 };
 
+GHashTable *mime_function_table = NULL;
+
 static void
 write_field_to_stream (gchar* description, gchar* value, CamelStream *stream)
 {
@@ -47,24 +49,24 @@ write_field_to_stream (gchar* description, gchar* value, CamelStream *stream)
 static void
 write_recipients_to_stream (const gchar *recipient_type,
 			    const GList *recipients,
-			    CamelStream* stream_out)
+			    CamelStream* stream)
 {
 	gchar *s;
-	g_assert (recipient_type && stream_out);
+	g_assert (recipient_type && stream);
 	
 	/* Write "To:", "CC:", or "BCC:" to the stream */
 	s = g_strdup_printf ("<b>%s:</b> ", recipient_type);
-	camel_stream_write_string (stream_out, s);
+	camel_stream_write_string (stream, s);
 	g_free (s);
 
 	/* Write out each recipient of 'recipient_type' to the stream */
  	while (recipients) {
-		camel_stream_write_string (stream_out, recipients->data);
+		camel_stream_write_string (stream, recipients->data);
 		recipients = recipients->next;
 		if (recipients)
-			camel_stream_write_string (stream_out, "; ");
+			camel_stream_write_string (stream, "; ");
 	}
-	camel_stream_write_string (stream_out, "<br><br>\n");	
+	camel_stream_write_string (stream, "<br><br>\n");	
 }
 
 
@@ -77,32 +79,32 @@ camel_formatter_new ()
 
 static void
 write_header_info_to_stream (CamelMimeMessage* mime_message,
-			     CamelStream* stream_out)
+			     CamelStream* stream)
 {
 	gchar *s = NULL;
 	const GList *recipients = NULL;
 
-	g_assert (mime_message && stream_out);
+	g_assert (mime_message && stream);
 
-	camel_stream_write_string (stream_out, "Content type: text/html\n");
+	camel_stream_write_string (stream, "Content type: text/html\n");
 	
 	/* A few fields will probably be available from the mime_message;
 	   for each one that's available, write it to the output stream
 	   with a helper function, 'write_field_to_stream'. */
 	if ((s = (gchar*)camel_mime_message_get_subject (mime_message))) {
-		write_field_to_stream ("Subject: ", s, stream_out);
+		write_field_to_stream ("Subject: ", s, stream);
 	}
 
 	if ((s = (gchar*)camel_mime_message_get_from (mime_message))) {
-		write_field_to_stream ("From: ", s, stream_out);
+		write_field_to_stream ("From: ", s, stream);
 	}
 
 	if ((s = (gchar*)camel_mime_message_get_received_date (mime_message))) {
-		write_field_to_stream ("Received Date: ", s, stream_out);
+		write_field_to_stream ("Received Date: ", s, stream);
 	}
 
 	if ((s = (gchar*)camel_mime_message_get_sent_date (mime_message))) {
-		write_field_to_stream ("Sent Date: ", s, stream_out);
+		write_field_to_stream ("Sent Date: ", s, stream);
 	}		
  
 	/* Fill out the "To:" recipients line */
@@ -110,19 +112,19 @@ write_header_info_to_stream (CamelMimeMessage* mime_message,
 		mime_message, CAMEL_RECIPIENT_TYPE_TO);
 	
 	if (recipients)
-		write_recipients_to_stream ("To:", recipients, stream_out);
+		write_recipients_to_stream ("To:", recipients, stream);
 
 	/* Fill out the "CC:" recipients line */
 	recipients = camel_mime_message_get_recipients (
 		mime_message, CAMEL_RECIPIENT_TYPE_CC);
 	if (recipients)
-		write_recipients_to_stream ("CC:", recipients, stream_out);	
+		write_recipients_to_stream ("CC:", recipients, stream);	
 
 	/* Fill out the "BCC:" recipients line */
 	recipients = camel_mime_message_get_recipients (
 		mime_message, CAMEL_RECIPIENT_TYPE_BCC);	
 	if (recipients)
-		write_recipients_to_stream ("BCC:", recipients, stream_out);
+		write_recipients_to_stream ("BCC:", recipients, stream);
 }
 
  
@@ -155,7 +157,8 @@ write_mimepart_to_stream (CamelMimePart* mime_part, CamelStream* stream)
 
 /* returns NULL if no text/html or text/plan msg is found */
 static CamelMimePart*
-find_text_body_part_in_multipart_related (CamelMultipart* multipart)
+find_preferred_displayable_body_part_in_multipart_related (
+	CamelMultipart* multipart)
 {
 	int i, max_multiparts;
 	CamelMimePart* html_part = NULL;
@@ -163,8 +166,10 @@ find_text_body_part_in_multipart_related (CamelMultipart* multipart)
 
 	/* find out out many parts are in it...*/
 	max_multiparts = camel_multipart_get_number (multipart);
-	
-	/* ...and write each one, as html, into the stream. */
+
+        /* TODO: DO LEAF-LOOKUP HERE FOR OTHER MIME-TYPES!!! */
+
+        /* ...and write each one, as html, into the stream. */
 	for (i = 0; i < max_multiparts; i++) {
 		CamelMimeBodyPart* body_part = camel_multipart_get_part (multipart, i);
 		if (strmatch (MIME_TYPE_SUB (body_part), "plain")) {
@@ -182,33 +187,21 @@ find_text_body_part_in_multipart_related (CamelMultipart* multipart)
 	return NULL;
 }
 
-
-/**
- * camel_formatter_make_html: 
- * @formatter: the camel formatter object
- * @stream_out: byte stream where data will be written 
- *
- * Writes a CamelMimeMessage out, as html, into a stream passed in as
- * a parameter.
- **/
-void
-camel_formatter_make_html (CamelFormatter* formatter,
-			   CamelMimeMessage* mime_message,
-			   CamelStream* stream_out)
+/* Converts the contents of a CamelMimePart into HTML */
+static void
+mime_part_to_html (CamelFormatter* formatter, CamelMimePart* part,
+			    CamelStream *stream)
 {
 	/* Get the mime-type of the mime message */
 	gchar* mime_type_whole = /* ex. "text/plain" */
-		MIME_TYPE_WHOLE (mime_message);
+		MIME_TYPE_WHOLE (part);
 
 	/* get the contents of the mime message */
-	CamelDataWrapper* message_contents = camel_medium_get_content_object (
-		CAMEL_MEDIUM (mime_message));
-	
-	/* write the 'subject:', 'to:', 'from:', etc. into the output stream */
-	write_header_info_to_stream (mime_message, stream_out);
+	CamelDataWrapper* message_contents =
+		camel_medium_get_content_object (CAMEL_MEDIUM (part));
 
 	/* if we're dealing with a multipart/related message... */
-	if (strmatch (MIME_TYPE_WHOLE (mime_message), "multipart/related")) {
+	if (strmatch (MIME_TYPE_WHOLE (part), "multipart/related")) {
 
 		CamelMultipart *multipart = CAMEL_MULTIPART (
 			message_contents);
@@ -223,18 +216,28 @@ camel_formatter_make_html (CamelFormatter* formatter,
 			CamelMimeBodyPart* body_part =
 				camel_multipart_get_part (multipart, i);
 
-			write_mimepart_to_stream (CAMEL_MIME_PART (body_part), stream_out);
+			/* TODO: insert html delimiters, probably
+			 * <hr>'s, before and after the following
+			 * call*/
+			mime_part_to_html (
+				formatter, CAMEL_MIME_PART (body_part),
+				stream);
 		}
 	}
-	else { /* okay, it's not multipart-related */
 
+	/* okay, it's not multipart-related, so we have only one 'thing'
+	 * to convert to html */
+	else { 
 		CamelMimePart* mime_part = NULL;
 
+		/* if it's a multipart/alternate, track down one we can
+		 * convert to html (if any) */
 		if (strmatch (mime_type_whole, "multipart/alternate")) {
 			mime_part =
-				find_text_body_part_in_multipart_related (
+				find_preferred_displayable_body_part_in_multipart_related (
 					CAMEL_MULTIPART(message_contents));
 		}
+
 		else if (strmatch (mime_type_whole, "text/plain") ||
 			 strmatch (mime_type_whole, "text/html")) {
 
@@ -249,13 +252,108 @@ camel_formatter_make_html (CamelFormatter* formatter,
 				"Sorry, but I don't know how to display items of type %s\n",
 				mime_type_whole);
 
-			camel_stream_write_string (stream_out, error_string);
+			camel_stream_write_string (stream, error_string);
 			g_free (error_string);
 		}
-	}
+	}	
+	
 }
 
 
+/**
+ * camel_formatter_mime_message_to_html: 
+ * @formatter: the camel formatter object
+ * @mime_message: the input mime message
+ * @stream: byte stream where data will be written 
+ *
+ * Writes a CamelMimeMessage out, as html, into a stream passed in as
+ * a parameter.
+ **/
+void
+camel_formatter_mime_message_to_html (CamelFormatter* formatter,
+				      CamelMimeMessage* mime_message,
+				      CamelStream* stream)
+{
+
+}
+
+typedef void (*mime_handler_fn) (CamelFormatter *formatter,
+				 CamelDataWrapper *data_wrapper,
+				 CamelStream *stream);
+
+static void
+handle_text_plain (CamelFormatter *formatter, CamelDataWrapper *wrapper,
+		   CamelStream *stream)
+{
+	
+}
+
+static void
+handle_html (CamelFormatter *formatter, CamelDataWrapper *wrapper,
+	     CamelStream *stream)
+{
+	
+}
+
+static void
+handle_multipart_related (CamelFormatter *formatter,
+			  CamelDataWrapper *wrapper,
+			  CamelStream *stream)
+{
+	
+}
+
+static void
+handle_multipart_alternate (CamelFormatter *formatter,
+			    CamelDataWrapper *wrapper,
+			    CamelStream *stream)
+{
+	
+}
+
+static void
+handle_unknown_type (CamelFormatter *formatter,
+		     CamelDataWrapper *wrapper,
+		     CamelStream *stream)
+{
+	
+}
+
+static void
+call_handler_function (CamelFormatter* formatter,
+		       CamelDataWrapper* wrapper, gchar* mimetype)
+{
+	mime_handler_fn handler_function;
+	
+	handler_function = g_hash_table_lookup (
+		mime_function_table, mimetype);
+
+	if (!handler_function)
+		handler_function = handle_unknown_type;
+}
+
+
+static void
+handle_mime_message (CamelFormatter *formatter,
+		     CamelDataWrapper *wrapper,
+		     CamelStream *stream)
+{
+	CamelMimeMessage* mime_message =
+		CAMEL_MIME_MESSAGE (wrapper);
+	
+	CamelDataWrapper* message_contents =
+		camel_medium_get_content_object (CAMEL_MEDIUM (mime_message));
+
+	/* write the subj:, to:, from: etc. fields out as html */
+	write_header_info_to_stream (mime_message, stream);
+
+	/* dispatch the correct handler function for the mime type */
+	call_handler_function (formatter, message_contents, MIME_TYPE_WHOLE (mime_message));
+	
+	/* close up the table opened by 'write_header_info_to_stream' */
+	camel_stream_write_string (stream, "</td></tr></table>");		
+}
+
 static void
 camel_formatter_class_init (CamelFormatterClass *camel_formatter_class)
 {
@@ -263,12 +361,23 @@ camel_formatter_class_init (CamelFormatterClass *camel_formatter_class)
 		GTK_OBJECT_CLASS (camel_formatter_class);
 
 	parent_class = gtk_type_class (gtk_object_get_type ());
-	
-	/* virtual method overload */
+
+	mime_function_table = g_hash_table_new (g_str_hash, g_str_equal);
+
+#define ADD_HANDLER(a,b) g_hash_table_insert (mime_function_table, a, b)
+
+	/* hook up mime types to functions that handle them */
+	ADD_HANDLER ("text/plain", handle_text_plain);
+	ADD_HANDLER ("text/html", handle_html);
+	ADD_HANDLER ("multipart/alternate", handle_multipart_alternate);
+	ADD_HANDLER ("multipart/related", handle_multipart_related);
+	ADD_HANDLER ("message/rfc822", handle_mime_message);	
+
+        /* virtual method overload */
 	gtk_object_class->finalize = _finalize;
 }
 
-void
+static void
 camel_formatter_init (gpointer object, gpointer klass) 
 {
 	CamelFormatter* cmf = CAMEL_FORMATTER (object);
diff --git a/camel/camel-formatter.h b/camel/camel-formatter.h
index 1bcbb2d01a..30dbc2008e 100644
--- a/camel/camel-formatter.h
+++ b/camel/camel-formatter.h
@@ -61,9 +61,9 @@ CamelFormatter* camel_formatter_new (void);
 
 /* The main job of CamelFormatter is to take a mime message, and
    produce html from it. */
-void     camel_formatter_make_html (CamelFormatter* cmf,
-				    CamelMimeMessage *msg,
-				    CamelStream* stream_out);
+void camel_formatter_mime_message_to_html (CamelFormatter* formatter,
+					   CamelMimeMessage* mime_message,
+					   CamelStream* stream);
 
 
 #ifdef __cplusplus