Populate conversations with logs, if any saved

Also adds a function to protocols to toggle this― if CayaProtocol::SaveLogs()
returns true, then local logs will be used to popualte conversation
windows. Otherwise, it's up to the protocol itself.

A new protocol IM_MESSAGE was also created, IM_LOGS_RECEIVED, which can
be used to populate conversations with old logs.

application/CayaProtocol.h

@@ -47,6 +47,9 @@ public:
 	//! Protocol icon
 	virtual BBitmap* Icon() const = 0;
 
+	//! Use local logs to populate chat
+	virtual bool SaveLogs() const = 0;
+
 	//! Add-on's path
 	virtual void SetPath(BPath path) = 0;
 	virtual BPath Path() = 0;

application/CayaProtocolMessages.h

@@ -68,6 +68,9 @@ enum im_what_code {
 	//! User stopped typing
 	IM_USER_STOPPED_TYPING				= 27,
 
+	//! Logs received
+	IM_LOGS_RECEIVED					= 28,
+
 	/*
 	 * Messages related to contact changes.
 	 */

application/ChatWindow.cpp

@@ -24,6 +24,7 @@
 #include <SpaceLayoutItem.h>
 #include <ScrollView.h>
 #include <String.h>
+#include <StringList.h>
 #include <Notification.h>
 
 #include <libinterface/BitmapView.h>
@@ -236,6 +237,17 @@ ChatWindow::ImMessage(BMessage* msg)
 			
 			break;
 		}
+		case IM_LOGS_RECEIVED:
+		{
+			BStringList logs;
+			if (msg->FindStrings("log", &logs) != B_OK)
+				return;
+
+			for (int i = logs.CountStrings(); i >= 0; i--)
+				fReceiveView->AppendGenericMessage(logs.StringAt(i).String());
+
+			break;
+		}
 		case IM_CONTACT_STARTED_TYPING:
 			fStatus->SetText("Contact is typing...");
 			break;

application/Conversation.cpp

@@ -7,6 +7,7 @@
 
 #include <DateTimeFormat.h>
 #include <Locale.h>
+#include <StringList.h>
 
 #include "CayaPreferences.h"
 #include "CayaProtocolMessages.h"
@@ -216,15 +217,21 @@ Conversation::_CreateChatWindow()
 {
 	fChatWindow = new ChatWindow(this);
 	WindowsManager::Get()->RelocateWindow(fChatWindow);
+
+	if (fLooper->Protocol()->SaveLogs() == false)
+		return;
+
+	BStringList logs = _GetChatLogs();
+	BMessage logMsg(IM_MESSAGE);
+	logMsg.AddInt32("im_what", IM_LOGS_RECEIVED);
+	logMsg.AddStrings("log", logs);
+	fChatWindow->ImMessage(&logMsg);
 }
 
 
-#include <iostream>
 void
 Conversation::_LogChatMessage(BMessage* msg)
 {
-	_EnsureLogPath();
-
 	BString date;
 	fDateFormatter.Format(date, time(0), B_SHORT_DATE_FORMAT, B_MEDIUM_TIME_FORMAT);
 
@@ -236,7 +243,6 @@ Conversation::_LogChatMessage(BMessage* msg)
 	else
 		uname = "You";
 
-
 	BString logLine("[");
 	logLine << date;
 	logLine << "] ";
@@ -246,8 +252,33 @@ Conversation::_LogChatMessage(BMessage* msg)
 	logLine << "\n";
 
 
-	BFile log(fLogPath.Path(), B_WRITE_ONLY | B_OPEN_AT_END | B_CREATE_FILE);
-	log.Write(logLine.String(), logLine.Length());
+	// TODO: Don't hardcode 21, expose maximum as a setting
+	BStringList logs = _GetChatLogs();
+	logs.Remove(21);
+	logs.Add(logLine, 0);
+
+	BMessage newLogMsg;
+	newLogMsg.AddStrings("log", logs);
+
+	BFile logFile(fLogPath.Path(), B_READ_WRITE | B_CREATE_FILE);
+	newLogMsg.Flatten(&logFile);
+}
+
+
+BStringList
+Conversation::_GetChatLogs()
+{
+	_EnsureLogPath();
+
+	BFile logFile(fLogPath.Path(), B_READ_WRITE | B_CREATE_FILE);
+	BMessage logMsg;
+	BStringList logs;
+
+	if (logMsg.Unflatten(&logFile) == B_OK) {
+		logMsg.FindStrings("log", &logs);
+	}
+
+	return logs;
 }
 
 

application/Conversation.h

@@ -57,6 +57,7 @@ public:
 
 private:
 	void				_LogChatMessage(BMessage* msg);
+	BStringList			_GetChatLogs();
 	void				_EnsureLogPath();
 
 	void				_CreateChatWindow();

application/views/CayaRenderView.cpp

@@ -48,6 +48,14 @@ CayaRenderView::AppendOwnMessage(const char* message)
 }
 
 
+void
+CayaRenderView::AppendGenericMessage(const char* message)
+{
+	Append(message, COL_TEXT, COL_TEXT, R_TEXT);
+	ScrollToSelection();
+}
+
+
 void
 CayaRenderView::AddEmoticText(const char * txt,  int16 cols , int16 font , int16 cols2 , int16 font2)
 {

application/views/CayaRenderView.h

@@ -39,6 +39,7 @@ class CayaRenderView : public RunView
 		
 		void	AppendOtherMessage(const char* otherNick, const char* message);
 		void	AppendOwnMessage(const char* message);
+		void	AppendGenericMessage(const char* message);
 		void 	AddEmoticText(const char * txt,  int16 cols , int16 font , int16 cols2 , int16 font2);
 		
 	protected:

protocols/xmpp/JabberHandler.h

@@ -57,6 +57,8 @@ public:
 
 	virtual	uint32					GetEncoding();
 
+	virtual bool					SaveLogs() const { return true; }
+
 	virtual CayaProtocolMessengerInterface*
 									MessengerInterface() const;