cleanup: Add and update license headers

In ExmUtils, ExmComment and ExmApplication.

src/exm-application.c

@@ -1,6 +1,6 @@
 /* exm-application.c
  *
- * Copyright 2022 Matthew Jakeman
+ * Copyright 2022-2024 Matthew Jakeman <[email protected]>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -14,6 +14,8 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
 #include "exm-config.h"
@@ -180,19 +182,19 @@ exm_application_show_about (GSimpleAction *action,
     adw_about_dialog_set_comments (ADW_ABOUT_DIALOG (about_dialog), _("Browse, install, and manage GNOME Shell Extensions."));
     adw_about_dialog_set_developers (ADW_ABOUT_DIALOG (about_dialog), authors);
     adw_about_dialog_set_translator_credits (ADW_ABOUT_DIALOG (about_dialog), _("translator-credits"));
-    adw_about_dialog_set_copyright (ADW_ABOUT_DIALOG (about_dialog), "© 2022 Matthew Jakeman");
+    adw_about_dialog_set_copyright (ADW_ABOUT_DIALOG (about_dialog), "© 2022-2024 Matthew Jakeman");
 
 #if WITH_BACKTRACE
     adw_about_dialog_add_legal_section (ADW_ABOUT_DIALOG (about_dialog),
                                         "libbacktrace",
-                                        "Copyright (C) 2012-2016 Free Software Foundation, Inc.",
+                                        "© 2012-2016 Free Software Foundation, Inc.",
                                         GTK_LICENSE_BSD_3,
                                         NULL);
 #endif
 
     adw_about_dialog_add_legal_section (ADW_ABOUT_DIALOG (about_dialog),
                                         "blueprint",
-                                        "Copyright (C) 2021 James Westman",
+                                        "© 2021 James Westman",
                                         GTK_LICENSE_LGPL_3_0,
                                         NULL);
 

src/exm-utils.c

@@ -1,6 +1,6 @@
 /* exm-utils.c
  *
- * Copyright 2022 Matthew Jakeman <[email protected]>
+ * Copyright 2022-2024 Matthew Jakeman <[email protected]>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by

src/exm-utils.h

@@ -1,6 +1,6 @@
 /* exm-utils.h
  *
- * Copyright 2022 Matthew Jakeman <[email protected]>
+ * Copyright 2022-2024 Matthew Jakeman <[email protected]>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by

src/web/model/exm-comment.c

@@ -1,3 +1,23 @@
+/* exm-comment.c
+ *
+ * Copyright 2022-2024 Matthew Jakeman <[email protected]>
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
 #include "exm-comment.h"
 
 #include "exm-utils.h"