Replace (MIME)=(*)

[sonichy]

Set default app: ~/.config/mimeapps.list
MIME and desktop is dynamic, get by FileManager openwith interface.
Match

image/jpg=deepin-image-viewer.desktop

Relace to

image/jpg=HTYIV.desktop

QString MIME = "image/jpg";
QString desktop = "/usr/share/applications/HTYIV.desktop";
QString default_apps = QStandardPaths::writableLocation(QStandardPaths::HomeLocation) + "/.config/mimeapps.list";
QFile *file = new QFile;
file->setFileName(default_apps);
QString s="";
bool ok = file->open(QIODevice::ReadOnly);
if (ok) {
    QTextStream TS(file);
    s = TS.readAll();
    file->close();
}
file->setFileName(default_apps);
ok = file->open(QFile::WriteOnly);
if (ok) {
    QFileInfo FI(desktop);
    QTextStream TS(file);
    s.replace(QRegularExpression(MIME + "=*\n"), MIME + "=" + FI.fileName());
    TS << s;
    file->close();
}

[SGaist]

Hi,

Since there's no question, are you asking why the regular expression you are using to replace =* does not work ?

That's because * has a specific meaning in regular expressions. It means 0 or more times the preceding expression. So if you want to detect in a string you need to escape it.

On a side note, you should move to QRegularExpression as QRegExp has been deprecated in Qt 5 and removed in Qt 6.

[sonichy]

@SGaist said in Replace (MIME)=(*):

Hi,

Since there's no question, are you asking why the regular expression you are using to replace =* does not work ?

That's because * has a specific meaning in regular expressions. It means 0 or more times the preceding expression. So if you want to detect in a string you need to escape it.

On a side note, you should move to QRegularExpression as QRegExp has been deprecated in Qt 5 and removed in Qt 6.

Done !

//s.replace(QRegularExpression(MIME + "=*\n"), MIME + "=" + FI.fileName());
s.replace(QRegularExpression(MIME + "=.*\n"), MIME + "=" + FI.fileName() + "\n");