[libcalamares] Convenience function for FS names

Because getting the untranslated name of a FileSystem is something
that needs doing consistently, add some functions for that;
it makes it easier to spot places where that isn't done.

Probably doesn't compile, and needs extra documentation.

src/libcalamares/partition/FSName.h

@@ -0,0 +1,52 @@
+/* === This file is part of Calamares - <https://github.com/calamares> ===
+ *
+ *   Copyright 2020, Adriaan de Groot <groot@kde.org>
+ *
+ *   Calamares is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Calamares is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Calamares. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @brief Gets filesystem names from KPMCore
+ *
+ * A name (e.g. "ext4") can be for internal, untranslated, use, or for
+ * user-visible use. In the latter case it should be translated. The
+ * KPMCore API gives user-visible names by default.
+ */
+#ifndef PARTITION_FSNAME_H
+#define PARTITION_FSNAME_H
+
+#include <fs/filesystem.h>
+
+#include <QString>
+
+namespace CalamaresUtils
+{
+namespace Partition
+{
+
+static inline QString
+untranslatedFS( FileSystem& fs )
+{
+    return fs.name( { QStringLiteral( "C" ) } );
+}
+
+static inline QString
+untranslatedFS( FileSystem* fs )
+{
+    return fs ? untranslatedFS( *fs ) : QString();
+}
+
+}  // namespace Partition
+}  // namespace CalamaresUtils
+
+#endif  // PARTITION_FSNAME_H