added fastlane structure for fdroid

fastlane/metadata/android/en-US/changelogs/10000.txt

@@ -0,0 +1 @@
+* Initial release

fastlane/metadata/android/en-US/changelogs/10001.txt

@@ -0,0 +1 @@
+* Better handling of website misbehavior, where the newest photo of the day couldn't be loaded.

fastlane/metadata/android/en-US/changelogs/10100.txt

@@ -0,0 +1 @@
+* Now you can see the image description within the app.

fastlane/metadata/android/en-US/changelogs/20100.txt

@@ -0,0 +1 @@
+* Uses new Muzei-API 2 :)

fastlane/metadata/android/en-US/changelogs/20101.txt

@@ -0,0 +1,2 @@
+* Use Material theme as base
+* Also should fix the problem of too dark text.

fastlane/metadata/android/en-US/changelogs/20200.txt

@@ -0,0 +1,3 @@
+* Fixed some issues with reloading new photos. Everything should work smoothly, again. :)
+* Also added support for dark/light themes in Android 10.
+* Under the hood improvement: Uses the newest Muzei API v3.2.0.

fastlane/metadata/android/en-US/changelogs/20201.txt

@@ -0,0 +1,2 @@
+* Fixes "about this photo" and "share" not working on Android 10+
+* Minor improvements

fastlane/metadata/android/en-US/changelogs/20300.txt

@@ -0,0 +1,3 @@
+* Make the App work again: switch from nationalgeographic.com to nationalgeographic.co.uk
+* Implemented some tests to make it easier in the future to detect api changes
+* Minor improvements

fastlane/metadata/android/en-US/full_description.txt

@@ -0,0 +1,6 @@
+The National Geographic photo of the day for Muzei.
+This is a plugin for the live wallpaper app Muzei by Roman Nurik. It needs Muzei to be used.
+
+* Toggle between having always the newest photo of the day and showing random wallpapers.
+* Read the entire photo description of the current photo within the app.
+* Share your current photo with the world.

fastlane/metadata/android/en-US/short_description.txt

@@ -0,0 +1 @@
+The National Geographic photo of the day for Muzei.

fastlane/metadata/android/en-US/title.txt

@@ -0,0 +1 @@
+National Geographic for Muzei

muzei-nationalgeographic/build.gradle

@@ -51,11 +51,8 @@ android {
       minSdkVersion 21
       targetSdkVersion 30
       // SemVer
-      def major = 2
-      def minor = 3
-      def patch = 0
-      versionCode = (major * 10000) + (minor * 100) + patch
-      versionName = "$major ($major.$minor.$patch)"
+      versionName = "2.3.0"
+      versionCode = 20300
       archivesBaseName = "$applicationId-v$versionCode"
       //
       vectorDrawables.useSupportLibrary = true
@@ -114,3 +111,47 @@ android {
    }
 
 }
+
+// versionCode <-> versionName /////////////////////////////////////////////////////////////////////
+
+/**
+ * Checks if versionCode and versionName match.
+ * Needed because of F-Droid: both have to be hard-coded and can't be assigned dynamically.
+ * So at least check during build for them to match.
+ */
+task checkVersion doLast {
+    int versionCode = android.defaultConfig.versionCode
+    int correctVersionCode = generateVersionCode(android.defaultConfig.versionName)
+    if (versionCode != correctVersionCode)
+        throw new GradleException(
+                "versionCode and versionName don't match: " +
+                        "versionCode should be $correctVersionCode. Is $versionCode."
+        )
+}
+assemble.dependsOn checkVersion
+
+/**
+ * Checks if a fastlane changelog for the current version is present.
+ */
+task checkFastlaneChangelog doLast {
+    int versionCode = android.defaultConfig.versionCode
+    File changelogFile = file("$rootDir/fastlane/metadata/android/en-US/changelogs/${versionCode}.txt")
+    if (!changelogFile.exists())
+        throw new GradleException(
+                "Fastlane changelog missing: expecting file '$changelogFile'"
+        )
+}
+build.dependsOn checkFastlaneChangelog
+
+/**
+ * Generates a versionCode based on the given semVer String.
+ * See e.g. https://proandroiddev.com/keep-salinity-with-your-versioncode-db2089b640b9
+ *
+ * @param semVer e.g. 1.3.1
+ * @return e.g. 10301 (-> 1 03 01)
+ */
+private static int generateVersionCode(String semVer) {
+    return semVer.split('\\.')
+            .collect { Integer.parseInt(it) }
+            .inject { sum, value -> sum * 100 + value }
+}