detailed export state, prepare resolution for #6512

(Post-processing step should announce itself during an export)

libs/ardour/ardour/export_status.h

@@ -53,7 +53,13 @@ class LIBARDOUR_API ExportStatus {
 
 	/* Progress info */
 
-	volatile bool           normalizing;
+	volatile enum Progress {
+		Exporting,
+		Normalizing,
+		Tagging,
+		Uploading,
+		Command }
+	                        active_job;
 
 	volatile uint32_t       total_timespans;
 	volatile uint32_t       timespan;

libs/ardour/export_handler.cc

@@ -272,9 +272,9 @@ ExportHandler::process_normalize ()
 {
 	if (graph_builder->process_normalize ()) {
 		finish_timespan ();
-		export_status->normalizing = false;
+		export_status->active_job = ExportStatus::Exporting;
 	} else {
-		export_status->normalizing = true;
+		export_status->active_job = ExportStatus::Normalizing;
 	}
 
 	export_status->current_normalize_cycle++;
@@ -316,6 +316,7 @@ ExportHandler::finish_timespan ()
 			 * TODO: check Umlauts and encoding in filename.
 			 * TagLib eventually calls CreateFileA(),
 			 */
+			export_status->active_job = ExportStatus::Tagging;
 			graph_builder->reset ();
 			AudiofileTagger::tag_file(filename, *SessionMetadata::Metadata());
 		}
@@ -330,7 +331,7 @@ ExportHandler::finish_timespan ()
 				...
 			};
 #endif
-
+			export_status->active_job = ExportStatus::Command;
 			PBD::ScopedConnection command_connection;
 			std::map<char, std::string> subs;
 			subs.insert (std::pair<char, std::string> ('f', filename));

libs/ardour/export_status.cc

@@ -39,7 +39,7 @@ ExportStatus::init ()
 	_finished = false;
 	_errors = false;
 
-	normalizing = false;
+	active_job = Exporting;
 
 	total_timespans = 0;
 	timespan = 0;