Changes that will need to be reworked.

QFont changed the weight scale in Qt6, in order to use them we'd need to fix all configuration files in all themes.
QStreamConverter only supports Utf8/16/32 and Latin1 before Qt6.5. Stick to qt5compat's QTextCodec by now

6 files changed, 60 insertions, 12 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ea6c20d22..e34c16872 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -421,7 +421,7 @@ set(CMAKE_STATUS_QX11INFO_SUPPORT "Not available")
 include_directories(${Qt${QT_VERSION_MAJOR}Widgets_INCLUDE_DIRS})
 list(APPEND qt_kvirc_modules Qt::Widgets)
 
-# Qt6 Compat module for Qt5; Needed by QRegExp
+# Qt6 Compat module for Qt5; Needed by QTextCodec
 if(${QT_VERSION_MAJOR} EQUAL 6)
 	find_package(Qt6 REQUIRED COMPONENTS Core5Compat)
 	if(Qt6Core5Compat_FOUND)
diff --git a/src/kvilib/ext/KviStringConversion.cpp b/src/kvilib/ext/KviStringConversion.cpp
index 8b8e557ea..b12a1ef84 100644
--- a/src/kvilib/ext/KviStringConversion.cpp
+++ b/src/kvilib/ext/KviStringConversion.cpp
@@ -226,7 +226,13 @@ namespace KviStringConversion
 	void toString(const QFont & font, QString & szBuffer)
 	{
 		QString szFamily(font.family());
-		szBuffer = QString::asprintf("%s,%d,%d,%d", szFamily.toUtf8().data(), font.pointSize(), font.styleHint(), font.weight());
+		szBuffer = QString::asprintf("%s,%d,%d,%d", szFamily.toUtf8().data(), font.pointSize(), font.styleHint(),
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
+			font.weight()
+#else
+			font.legacyWeight()
+#endif
+		);
 		QString szOptions;
 		if(font.bold())
 			szOptions.append('b');
@@ -266,8 +272,11 @@ namespace KviStringConversion
 			buffer.setStyleHint((QFont::StyleHint)i);
 		i = weight.toInt(&bOk);
 		if(bOk && (i >= 0))
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
 			buffer.setWeight(i);
-
+#else
+			buffer.setLegacyWeight(i);
+#endif
 		buffer.setBold(str.contains("b"));
 		buffer.setItalic(str.contains("i"));
 		buffer.setUnderline(str.contains("u"));
diff --git a/src/kvilib/file/KviFileUtils.cpp b/src/kvilib/file/KviFileUtils.cpp
index 283bdc501..755557912 100644
--- a/src/kvilib/file/KviFileUtils.cpp
+++ b/src/kvilib/file/KviFileUtils.cpp
@@ -34,7 +34,11 @@
 #include <QString>
 #include <QStringList>
 #include <QtGlobal>
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
 #include <QTextCodec>
+#else
+#include <QStringConverter>
+#endif
 #include <QTextStream>
 
 namespace KviFileUtils
@@ -263,7 +267,13 @@ namespace KviFileUtils
 		KviFile f(szPath);
 		if(!f.open(QFile::WriteOnly | (bAppend ? QFile::Append : QFile::Truncate)))
 			return false;
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
 		QByteArray szTmp = QTextCodec::codecForLocale()->fromUnicode(szData);
+#else
+		QStringEncoder enc = QStringEncoder(QStringConverter::Latin1);
+		QByteArray szTmp = enc.encode(szData);
+#endif
+
 		if(f.write(szTmp.data(), szTmp.length()) != ((unsigned int)(szTmp.length())))
 			return false;
 		return true;
@@ -326,14 +336,16 @@ namespace KviFileUtils
 	bool readLine(QFile * pFile, QString & szBuffer, bool bUtf8)
 	{
 		QTextStream stream(pFile);
-		// By default, QTextCodec::codecForLocale() is used, and automatic unicode detection is enabled.
-		if(bUtf8)
-			stream.setCodec(QTextCodec::codecForMib(106));
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
 		/*
 		* Name: UTF-8
 		* MIBenum: 106
 		* from: http://www.iana.org/assignments/character-sets
 		*/
+    	stream.setCodec(bUtf8 ? QTextCodec::codecForMib(106) : QTextCodec::codecForLocale());
+#else
+		stream.setEncoding(bUtf8 ? QStringConverter::Utf8 : QStringConverter::Latin1);
+#endif
 		szBuffer = stream.readLine();
 		return !szBuffer.isNull();
 	}
@@ -341,9 +353,12 @@ namespace KviFileUtils
 	bool readLines(QFile * pFile, QStringList & buffer, int iStartLine, int iCount, bool bUtf8)
 	{
 		QTextStream stream(pFile);
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
 		//please read comments in the readLine(...) method
-		if(bUtf8)
-			stream.setCodec(QTextCodec::codecForMib(106));
+    	stream.setCodec(bUtf8 ? QTextCodec::codecForMib(106) : QTextCodec::codecForLocale());
+#else
+		stream.setEncoding(bUtf8 ? QStringConverter::Utf8 : QStringConverter::Latin1);
+#endif
 
 		for(int i = 0; i < iStartLine; i++)
 			stream.readLine();
diff --git a/src/modules/file/libkvifile.cpp b/src/modules/file/libkvifile.cpp
index b57cd7f26..ac527f720 100644
--- a/src/modules/file/libkvifile.cpp
+++ b/src/modules/file/libkvifile.cpp
@@ -35,7 +35,11 @@
 #include <QFileInfo>
 #include <QDir>
 #include <QTextStream>
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
 #include <QTextCodec>
+#else
+#include <QStringConverter>
+#endif
 #include <QByteArray>
 #include <QDateTime>
 
@@ -1081,8 +1085,11 @@ static bool file_kvs_fnc_readLines(KviKvsModuleFunctionCall * c)
 
 	QTextStream stream(&f);
 
-	if(!bLocal8Bit)
-		stream.setCodec(QTextCodec::codecForMib(106));
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
+    	stream.setCodec(bLocal8Bit ? QTextCodec::codecForLocale() : QTextCodec::codecForMib(106));
+#else
+		stream.setEncoding(bLocal8Bit ? QStringConverter::Latin1 : QStringConverter::Utf8);
+#endif
 
 	for(int i = 0; i < iStartLine; i++)
 		stream.readLine();
diff --git a/src/modules/help/HelpIndex.cpp b/src/modules/help/HelpIndex.cpp
index 4ce07616f..33c42781a 100644
--- a/src/modules/help/HelpIndex.cpp
+++ b/src/modules/help/HelpIndex.cpp
@@ -44,7 +44,11 @@
 #include <QByteArray>
 #include <QTextStream>
 #include <QUrl>
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
 #include <QTextCodec>
+#else
+#include <QStringConverter>
+#endif
 #include <cctype>
 #include <QTextDocument>
 #include <QTimer>
@@ -200,7 +204,11 @@ void HelpIndex::parseDocument(const QString & filename, int docNum)
 	}
 
 	QTextStream s(&file);
-	s.setCodec(QTextCodec::codecForMib(106));
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
+    s.setCodec(QTextCodec::codecForMib(106));
+#else
+	s.setEncoding(QStringConverter::Utf8);
+#endif
 	QString text = s.readAll();
 	if(text.isNull())
 		return;
diff --git a/src/modules/logview/LogFile.cpp b/src/modules/logview/LogFile.cpp
index 471099b73..200a2cb0c 100644
--- a/src/modules/logview/LogFile.cpp
+++ b/src/modules/logview/LogFile.cpp
@@ -40,6 +40,11 @@
 #include <QDir>
 #include <QTextStream>
 #include <QLocale>
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
+#include <QTextCodec>
+#else
+#include <QStringConverter>
+#endif
 
 #ifdef COMPILE_ZLIB_SUPPORT
 #include <zlib.h>
@@ -431,7 +436,11 @@ void LogFile::createLog(ExportType exportType, QString szLog, QString * pszFile)
 
 	// Ensure we're writing in UTF-8
 	QTextStream output(&log);
-	output.setCodec("UTF-8");
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
+    output.setCodec(QTextCodec::codecForMib(106));
+#else
+	output.setEncoding(QStringConverter::Utf8);
+#endif
 	output << szOutputBuffer;
 
 	// Close file descriptors