linux/appdata: generate release info

...and move cmake code to packaging/linux

app/packaging/CMakeLists.txt

@@ -0,0 +1,19 @@
+# Olive - Non-Linear Video Editor
+# Copyright (C) 2019 Olive Team
+#
+# 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/>.
+
+if(UNIX AND NOT APPLE)
+  add_subdirectory(linux)
+endif()

app/packaging/linux/CMakeLists.txt

@@ -0,0 +1,51 @@
+# Olive - Non-Linear Video Editor
+# Copyright (C) 2019 Olive Team
+#
+# 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/>.
+
+if(GIT_FOUND)
+  set(APPDATA_RELEASE_VERSION ${PROJECT_VERSION}-${GIT_HASH})
+  execute_process(COMMAND ${GIT_EXECUTABLE} log -1 --pretty=%cd --date=short
+    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+    OUTPUT_VARIABLE APPDATA_RELEASE_DATE
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+  )
+else()
+  set(APPDATA_RELEASE_VERSION ${PROJECT_VERSION})
+  file(TIMESTAMP "${CMAKE_SOURCE_DIR}/CMakeLists.txt" APPDATA_RELEASE_DATE "%Y-%m-%d")
+endif()
+
+configure_file(
+  org.olivevideoeditor.Olive.appdata.xml.in
+  org.olivevideoeditor.Olive.appdata.xml
+)
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/org.olivevideoeditor.Olive.appdata.xml DESTINATION share/metainfo)
+
+install(FILES org.olivevideoeditor.Olive.desktop DESTINATION share/applications)
+install(FILES org.olivevideoeditor.Olive.xml DESTINATION share/mime/packages)
+
+install(FILES icons/16x16/org.olivevideoeditor.Olive.png DESTINATION share/icons/hicolor/16x16/apps)
+install(FILES icons/32x32/org.olivevideoeditor.Olive.png DESTINATION share/icons/hicolor/32x32/apps)
+install(FILES icons/48x48/org.olivevideoeditor.Olive.png DESTINATION share/icons/hicolor/48x48/apps)
+install(FILES icons/64x64/org.olivevideoeditor.Olive.png DESTINATION share/icons/hicolor/64x64/apps)
+install(FILES icons/128x128/org.olivevideoeditor.Olive.png DESTINATION share/icons/hicolor/128x128/apps)
+install(FILES icons/256x256/org.olivevideoeditor.Olive.png DESTINATION share/icons/hicolor/256x256/apps)
+install(FILES icons/512x512/org.olivevideoeditor.Olive.png DESTINATION share/icons/hicolor/512x512/apps)
+install(FILES icons/16x16/application-vnd.olive-project.png DESTINATION share/icons/hicolor/16x16/mimetypes)
+install(FILES icons/32x32/application-vnd.olive-project.png DESTINATION share/icons/hicolor/32x32/mimetypes)
+install(FILES icons/48x48/application-vnd.olive-project.png DESTINATION share/icons/hicolor/48x48/mimetypes)
+install(FILES icons/64x64/application-vnd.olive-project.png DESTINATION share/icons/hicolor/64x64/mimetypes)
+install(FILES icons/128x128/application-vnd.olive-project.png DESTINATION share/icons/hicolor/128x128/mimetypes)
+install(FILES icons/256x256/application-vnd.olive-project.png DESTINATION share/icons/hicolor/256x256/mimetypes)
+install(FILES icons/512x512/application-vnd.olive-project.png DESTINATION share/icons/hicolor/512x512/mimetypes)

app/packaging/linux/org.olivevideoeditor.Olive.appdata.xml.in

@@ -29,9 +29,8 @@
   <screenshots>
     <screenshot type="default"><image>https://olivevideoeditor.org/img/screenshot.1600.jpg</image></screenshot>
   </screenshots>
-  <content_rating type="oars-1.1" />
+  <content_rating type="oars-1.1"/>
   <releases>
-    <release version="20181223" date="2018-12-23"></release>
-    <release version="20181130" date="2018-11-30"></release>
+    <release version="@APPDATA_RELEASE_VERSION@" date="@APPDATA_RELEASE_DATE@"/>
   </releases>
 </component>