fractal-gtk/res: rename appdata to metainfo

Appstream nowadays prefers `.metainfo.xml`:
https://www.freedesktop.org/software/appstream/docs/chap-Metadata.html

build-aux/snap/snapcraft.yaml

@@ -60,7 +60,7 @@ parts:
 
   fractal:
     after: [gspell]
-    parse-info: [usr/share/metainfo/org.gnome.Fractal.appdata.xml]
+    parse-info: [usr/share/metainfo/org.gnome.Fractal.metainfo.xml]
     source: .
     plugin: meson
     meson-parameters: [--prefix=/usr]

fractal-gtk/po/POTFILES.in

@@ -1,9 +1,9 @@
 # List of source files containing translatable strings.
 # Please keep this file sorted alphabetically.
 fractal-gtk/res/gtk/help-overlay.ui
-fractal-gtk/res/org.gnome.Fractal.appdata.xml.in.in
 fractal-gtk/res/org.gnome.Fractal.desktop.in.in
 fractal-gtk/res/org.gnome.Fractal.gschema.xml
+fractal-gtk/res/org.gnome.Fractal.metainfo.xml.in.in
 
 # ui files
 fractal-gtk/res/ui/account_settings.ui

fractal-gtk/res/meson.build

@@ -26,15 +26,15 @@ if desktop_file_validate.found()
 endif
 
 
-appdata_conf = configuration_data()
-appdata_conf.set('appid', application_id)
-appdata_file = i18n.merge_file ('appdata-file',
+metainfo_conf = configuration_data()
+metainfo_conf.set('appid', application_id)
+metainfo_file = i18n.merge_file ('metainfo-file',
   input: configure_file(
-    input: files('org.gnome.Fractal.appdata.xml.in.in'),
-    output: 'org.gnome.Fractal.appdata.xml.in',
-    configuration: appdata_conf
+    input: files('org.gnome.Fractal.metainfo.xml.in.in'),
+    output: 'org.gnome.Fractal.metainfo.xml.in',
+    configuration: metainfo_conf
   ),
-  output: '@0@.appdata.xml'.format(application_id),
+  output: '@0@.metainfo.xml'.format(application_id),
   po_dir: podir,
   install: true,
   install_dir: join_paths (datadir, 'metainfo')
@@ -42,9 +42,9 @@ appdata_file = i18n.merge_file ('appdata-file',
 appstream_util = find_program('appstream-util', required: false)
 if appstream_util.found()
   test(
-    'validate-appdata', appstream_util,
+    'validate-metainfo', appstream_util,
     args: [
-      'validate-relax', '--nonet', appdata_file.full_path()
+      'validate-relax', '--nonet', metainfo_file.full_path()
     ]
   )
 endif

scripts/new-release.sh

@@ -24,7 +24,7 @@ esac
 sed -i "s/$current/$next/" meson.build
 sed -i "s/$current/$next/" fractal-gtk/Cargo.toml
 sed -i "s/$current/$next/" fractal-matrix-api/Cargo.toml
-sed -i "s/version=\"$current\".*/version=\"$next\" date=\"$(date +%Y-%m-%d)\"\/>/" fractal-gtk/res/org.gnome.Fractal.appdata.xml.in.in
+sed -i "s/version=\"$current\".*/version=\"$next\" date=\"$(date +%Y-%m-%d)\"\/>/" fractal-gtk/res/org.gnome.Fractal.metainfo.xml.in.in
 
 cargo check