v.build.polylines
Builds polylines from lines or boundaries.
Vector (v.*)
QgsProcessingParameterFeatureSource|input|Name of input vector map|-1|None|False
QgsProcessingParameterEnum|cats|Category number mode|no;first;multi;same|False|0|True
QgsProcessingParameterEnum|type|Input feature type|line;boundary|True|0,1|True
QgsProcessingParameterVectorDestination|output|Polylines