Hoiw to implement "QT_MESSAGE_PATTERN

[Anonymous_Banned275]

I like to colorize parts (text) of the QDebug output.
After RTFM I am not sure how.,

Obviously my code is not correct .... and the example is not very informative....

https://woboq.com/blog/nice-debug-output-with-qt.html#:~:text=The trick I use which work with bash,and then the message in the normal color

C++ code example would be appreciated.

``
#ifdef TRACE_MDI_ADD_SUBWINDOW

export QT_MESSAGE_PATTERN="`echo -e "\033[34m%{function}\033[0m: %{message}"`"

    text = " START trace adding subw8indow (Continue  MDI TRACE)    ";
    text += Q_FUNC_INFO;
    text += "  @ line ";
    text += QString::number(__LINE__);

    // change color ??
    qDebug().
    qDebug() << text;
#endif

[posktomten]

@AnneRanch

Hello!

qDebug("\033[1;34m Bold Blue");
qDebug("\033[1;33m Bold Yellow");
qDebug("\033[0m Reset");

Color Code

I have tested with Linux and with Windows

[Paul Colby]

Hi @AnneRanch

I like to colorize parts (text) of the QDebug output.

Here's how I do it in one of my open-source projects:

#if defined(Q_OS_UNIX)
#include <unistd.h>
#elif defined(Q_OS_WIN)
#include <Windows.h>
#endif

inline bool haveConsole()
{
    #if defined(Q_OS_UNIX)
    return isatty(STDERR_FILENO);
    #elif defined(Q_OS_WIN)
    return GetConsoleWindow();
    #else
    return false;
    #endif
}

void configureLogging(const QCommandLineParser &parser)
{
    // Start with the Qt default message pattern (see qtbase:::qlogging.cpp:defaultPattern)
    QString messagePattern = QStringLiteral("%{if-category}%{category}: %{endif}%{message}");

    if (parser.isSet(QStringLiteral("debug"))) {
        #ifdef QT_MESSAGELOGCONTEXT
        // %{file}, %{line} and %{function} are only available when QT_MESSAGELOGCONTEXT is set.
        messagePattern.prepend(QStringLiteral("%{function} "));
        #endif
        messagePattern.prepend(QStringLiteral("%{time process} %{threadid} %{type} "));
    }

    const QString color = parser.value(QStringLiteral("color"));
    if ((color == QStringLiteral("yes")) || (color == QStringLiteral("auto") && haveConsole())) {
        messagePattern.prepend(QStringLiteral(
        "%{if-debug}\x1b[37m%{endif}"      // White
        "%{if-info}\x1b[32m%{endif}"       // Green
        "%{if-warning}\x1b[35m%{endif}"    // Magenta
        "%{if-critical}\x1b[31m%{endif}"   // Red
        "%{if-fatal}\x1b[31;1m%{endif}")); // Red and bold
        messagePattern.append(QStringLiteral("\x1b[0m")); // Reset.
    }

    qSetMessagePattern(messagePattern);
}

Cheers.