[libcalamares] Add a more extensible About message

- make the years easier to update without annoying translators
- make the maintainers extensible.

src/libcalamares/CMakeLists.txt

@@ -24,6 +24,7 @@ set( OPTIONAL_PRIVATE_LIBRARIES "" )
 set( OPTIONAL_PUBLIC_LIBRARIES "" )
 
 set( libSources
+    CalamaresAbout.cpp
     CppJob.cpp
     GlobalStorage.cpp
     Job.cpp

src/libcalamares/CalamaresAbout.cpp

@@ -0,0 +1,73 @@
+/* === This file is part of Calamares - <https://calamares.io> ===
+ *
+ *   SPDX-FileCopyrightText: 2022 Adriaan de Groot <groot@kde.org>
+ *   SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ *   Calamares is Free Software: see the License-Identifier above.
+ *
+ */
+
+#include "CalamaresAbout.h"
+
+#include <QCoreApplication>
+
+static const char s_header[]
+    = QT_TRANSLATE_NOOP( "AboutData", "<h1>%1</h1><br/><strong>%2<br/> for %3</strong><br/><br/>" );
+
+static const char s_footer[]
+    = QT_TRANSLATE_NOOP( "AboutData",
+                         "Thanks to <a href=\"https://calamares.io/team/\">the Calamares team</a> "
+                         "and the <a href=\"https://www.transifex.com/calamares/calamares/\">Calamares "
+                         "translators team</a>.<br/><br/>"
+                         "<a href=\"https://calamares.io/\">Calamares</a> "
+                         "development is sponsored by <br/>"
+                         "<a href=\"http://www.blue-systems.com/\">Blue Systems</a> - "
+                         "Liberating Software." );
+
+struct Maintainer
+{
+    unsigned int start;
+    unsigned int end;
+    const char* name;
+    const char* email;
+    QString text() const
+    {
+        //: Copyright year-year Name <email-address>
+        return QCoreApplication::translate( "AboutData", "Copyright %1-%2 %3 &lt;%4&gt;<br/>" )
+            .arg( start )
+            .arg( end )
+            .arg( name )
+            .arg( email );
+    }
+};
+
+static constexpr const Maintainer maintainers[] = {
+    { 2014, 2017, "Teo Mrnjavac", "teo@kde.org" },
+    { 2017, 2022, "Adriaan de Groot", "groot@kde.org" },
+};
+
+static QString
+aboutMaintainers()
+{
+    return std::accumulate( std::cbegin( maintainers ),
+                            std::cend( maintainers ),
+                            QString(),
+                            []( QString& s, const Maintainer& m )
+                            {
+                                s += m.text();
+                                return s;
+                            } );
+}
+
+const QString
+Calamares::aboutString()
+{
+    return QCoreApplication::translate( "AboutData", s_header ) + aboutMaintainers()
+        + QCoreApplication::translate( "AboutData", s_footer );
+}
+
+const QString
+Calamares::aboutStringUntranslated()
+{
+    return QString( s_header ) + aboutMaintainers() + QString( s_footer );
+}

src/libcalamares/CalamaresAbout.h

@@ -0,0 +1,23 @@
+/* === This file is part of Calamares - <https://calamares.io> ===
+ *
+ *   SPDX-FileCopyrightText: 2022 Adriaan de Groot <groot@kde.org>
+ *   SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ *   Calamares is Free Software: see the License-Identifier above.
+ *
+ */
+
+#ifndef CALAMARES_CALAMARESABOUT_H
+#define CALAMARES_CALAMARESABOUT_H
+
+#include "DllMacro.h"
+
+#include <QString>
+
+namespace Calamares
+{
+DLLEXPORT const QString aboutStringUntranslated();
+DLLEXPORT const QString aboutString();
+}  // namespace Calamares
+
+#endif