Merge pull request #8998 from alexbruy/processing-tempdir

[processing] handle Processing.TEMPORARY_OUTPUT for folder parameters

Author: alexbruy

src/core/processing/qgsprocessingparameters.cpp

@@ -82,6 +82,12 @@ QString QgsProcessingParameters::parameterAsString( const QgsProcessingParameter
     val = definition->defaultValue();
   }
 
+  if ( val == QgsProcessing::TEMPORARY_OUTPUT )
+  {
+    if ( const QgsProcessingDestinationParameter *destParam = dynamic_cast< const QgsProcessingDestinationParameter * >( definition ) )
+      return destParam->generateTemporaryDestination();
+  }
+
   return val.toString();
 }
 
@@ -695,7 +701,7 @@ QString QgsProcessingParameters::parameterAsFileOutput( const QgsProcessingParam
   if ( dest == QgsProcessing::TEMPORARY_OUTPUT )
   {
     if ( const QgsProcessingDestinationParameter *destParam = dynamic_cast< const QgsProcessingDestinationParameter * >( definition ) )
-      val = destParam->generateTemporaryDestination();
+      dest = destParam->generateTemporaryDestination();
   }
   return dest;
 }

tests/src/analysis/testqgsprocessing.cpp

@@ -5495,12 +5495,12 @@ void TestQgsProcessing::parameterFileOut()
   QCOMPARE( QgsProcessingParameters::parameterAsFileOutput( def.get(), params, context ), QStringLiteral( "test.txt" ) );
 
   params.insert( QStringLiteral( "non_optional" ), QgsProcessing::TEMPORARY_OUTPUT );
-  QCOMPARE( QgsProcessingParameters::parameterAsFileOutput( def.get(), params, context ).right( 7 ), QStringLiteral( "_OUTPUT" ) );
+  QCOMPARE( QgsProcessingParameters::parameterAsFileOutput( def.get(), params, context ).right( 18 ), QStringLiteral( "/non_optional.file" ) );
 
   QgsProcessingOutputLayerDefinition fs;
   fs.sink = QgsProperty::fromValue( QgsProcessing::TEMPORARY_OUTPUT );
   params.insert( QStringLiteral( "non_optional" ), QVariant::fromValue( fs ) );
-  QCOMPARE( QgsProcessingParameters::parameterAsFileOutput( def.get(), params, context ).right( 7 ), QStringLiteral( "_OUTPUT" ) );
+  QCOMPARE( QgsProcessingParameters::parameterAsFileOutput( def.get(), params, context ).right( 18 ), QStringLiteral( "/non_optional.file" ) );
 
   QCOMPARE( def->valueAsPythonString( QVariant(), context ), QStringLiteral( "None" ) );
   QCOMPARE( def->valueAsPythonString( QStringLiteral( "abc" ), context ), QStringLiteral( "'abc'" ) );
@@ -5656,6 +5656,10 @@ void TestQgsProcessing::parameterFolderOut()
   QCOMPARE( fromCode->description(), QStringLiteral( "optional" ) );
   QCOMPARE( fromCode->flags(), def->flags() );
   QCOMPARE( fromCode->defaultValue(), def->defaultValue() );
+
+  // temporary directory
+  def.reset( new QgsProcessingParameterFolderDestination( "junkdir", QString(), QgsProcessing::TEMPORARY_OUTPUT ) );
+  QCOMPARE( QgsProcessingParameters::parameterAsString( def.get(), params, context ).right( 8 ), QStringLiteral( "/junkdir" ) );
 }
 
 void TestQgsProcessing::parameterBand()