Better errors when guessing feed.

resources/desktop/com.github.rssguard.appdata.xml

@@ -30,7 +30,7 @@
   <url type="donation">https://martinrotter.github.io/donate/</url>
   <content_rating type="oars-1.1" />
   <releases>
-    <release version="3.9.0" date="2021-03-16"/>
+    <release version="3.9.0" date="2021-03-17"/>
   </releases>
   <content_rating type="oars-1.0">
     <content_attribute id="violence-cartoon">none</content_attribute>

resources/docs/Documentation.md

@@ -204,6 +204,8 @@ Any errors in your script must be written to **error output**.
 
 Note that you must provide full execution line to your custom script, including interpreter binary path and name and all that must be written in special format `<interpreter>#<argument1>#<argument2>#....`. The `#` character is there to separate interpreter and individual arguments. I had to select some character as separator because simply using space ` ` is not that easy as it might sound, because sometimes space could be a part of an argument sometimes argument separator etc.
 
+Used script must return `0` as process exit code if everything went well, or non-zero exit code if some error happened.
+
 Interpreter must be provided in all cases, arguments do not have to be. For example `bash.exe#` is valid execution line, as well as `bash#-c#cat feed.atom`. Note the difference in interpreter's binary name suffix. Also be very carefully about arguments quoting. Some examples of valid and tested execution lines are:
  
 | Command | Explanation |

src/librssguard/services/standard/gui/standardfeeddetails.cpp

@@ -78,6 +78,7 @@ StandardFeedDetails::StandardFeedDetails(QWidget* parent) : QWidget(parent) {
   m_ui.m_txtSource->textEdit()->setFocus(Qt::FocusReason::TabFocusReason);
 
   // Set feed metadata fetch label.
+  m_ui.m_lblFetchMetadata->label()->setWordWrap(true);
   m_ui.m_lblFetchMetadata->setStatus(WidgetWithStatus::StatusType::Information,
                                      tr("No metadata fetched so far."),
                                      tr("No metadata fetched so far."));

src/librssguard/services/standard/standardfeed.cpp

@@ -547,7 +547,9 @@ QString StandardFeed::runScriptProcess(const QStringList& cmd_args, const QStrin
     process.closeWriteChannel();
   }
 
-  if (process.waitForFinished(run_timeout) && process.exitStatus() == QProcess::ExitStatus::NormalExit) {
+  if (process.waitForFinished(run_timeout) &&
+      process.exitStatus() == QProcess::ExitStatus::NormalExit &&
+      process.exitCode() == EXIT_SUCCESS) {
     auto raw_output = process.readAllStandardOutput();
     auto raw_error = process.readAllStandardError();
 
@@ -564,6 +566,10 @@ QString StandardFeed::runScriptProcess(const QStringList& cmd_args, const QStrin
 
     auto raw_error = process.readAllStandardError().simplified();
 
+    if (raw_error.isEmpty()) {
+      raw_error = process.readAllStandardOutput().simplified();
+    }
+
     switch (process.error()) {
       case QProcess::ProcessError::Timedout:
         throw ScriptException(ScriptException::Reason::InterpreterTimeout);