rename, index, and use key identifying tasks

atom

@@ -1112,13 +1112,14 @@ unset count tagfiles
 echo '
 	CREATE TEMPORARY TABLE tasks(
 		id		INTEGER PRIMARY KEY,
-		unicity_check	TEXT	SECONDARY KEY,
+		key		TEXT	UNIQUE,
 		command_line	TEXT,
 		requires	INTEGER,
 		status		INTEGER NOT NULL,
 		FOREIGN KEY(requires) REFERENCES tasks(id)
 			ON DELETE SET NULL
-	);' >&3
+	);
+	CREATE INDEX tasks_by_key ON tasks ( key );' >&3
 
 echo '
 	SELECT	COUNT(DISTINCT source_files.id)
@@ -1192,11 +1193,15 @@ do
 		soxoptions_out+=" -c ${destinationchannels["$destination"]}"
 	fi
 	tmpfile="$fileid${soxoptions_in// /}${soxoptions_out// /}"
+	if ! decodetaskid=$(
+		Select tasks id <<<"key = $tmpfile"
+	)
+	then
 		soxoptions_in+=' --single-threaded'
 		soxoptions_out+=" --temp \"$tempdir\""
 		decodetaskid=$(
-		InsertIfUnset tasks <<-EOInsert
+			Insert tasks <<-EOInsert
-			unicity_check	$tmpfile
+				key		$tmpfile
 				command_line	sox $soxoptions_in "$sourcepath/$filename" $soxoptions_out "$tempdir/$tmpfile.wav"
 				status		0
 			EOInsert
@@ -1212,7 +1217,8 @@ do
 		then
 			echo 'COMMIT;BEGIN TRANSACTION;' >&3
 			(( debug ))	\
-		&& echo -e "\bCommitted $count tasks... "
+			&& echo -en "\bCommitted $count tasks...  "
+		fi
 	fi
 	unset			\
 		channels	\