Build nightly changelog from git

app/build.gradle

@@ -14,6 +14,7 @@ tasks.withType(Test) {
     systemProperty "logback.configurationFile", System.getProperty("user.dir", null) + "/app/src/main/assets/logback.xml"
     systemProperty "GB_LOGFILES_DIR", Files.createTempDirectory("gblog").toString()
 }
+
 def getVersionCode = { ->
     try {
         def stdout = new ByteArrayOutputStream()
@@ -27,6 +28,27 @@ def getVersionCode = { ->
     }
 }
 
+def buildGitChangelog = {
+    def stdout = new ByteArrayOutputStream()
+    exec {
+        commandLine 'git', 'log', '--pretty=format:%h %s'
+        standardOutput = stdout
+    }
+
+    def commitVersionCode = getVersionCode()
+    def changelogNode = new Node(null, 'changelog')
+
+    stdout.toString().trim().eachLine { line ->
+        def (commitHash, commitMessage) = line.split(" ", 2)
+        def releaseNode = new Node(changelogNode, 'release', [version: commitHash, versioncode: commitVersionCode--])
+        def _ = new Node(releaseNode, 'change', [:], commitMessage)
+    }
+
+    def changelogFile = new File("${project.rootDir}/app/build/generated/res/changelog/xml/changelog_git.xml")
+    changelogFile.getParentFile().mkdirs()
+    changelogFile.write(groovy.xml.XmlUtil.serialize(changelogNode))
+}
+
 def getGitHashShort = { ->
     try {
         def stdout = new ByteArrayOutputStream()
@@ -106,6 +128,12 @@ android {
         }
     }
 
+    sourceSets {
+        main {
+            res.srcDirs += "build/generated/res/changelog"
+        }
+    }
+
     buildTypes {
         release {
             minifyEnabled true
@@ -170,6 +198,7 @@ android {
 
         applicationVariants.all { variant ->
             variant.resValue "string", "applicationId", variant.applicationId
+            buildGitChangelog()
 
             if (variant.buildType.name == 'nightly' || variant.buildType.name == 'nopebble') {
                 variant.outputs.all {

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/GBApplication.java

@@ -1380,6 +1380,10 @@ public class GBApplication extends Application {
         return language;
     }
 
+    public static boolean isNightly() {
+        return BuildConfig.APPLICATION_ID.contains("nightly");
+    }
+
     public String getVersion() {
         try {
             return getPackageManager().getPackageInfo(getPackageName(), PackageManager.GET_META_DATA).versionName;

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/GBChangeLog.java

@@ -18,20 +18,41 @@ package nodomain.freeyourgadget.gadgetbridge.util;
 
 import android.content.Context;
 import android.content.DialogInterface;
+import android.util.SparseArray;
 import android.webkit.WebView;
 
 import androidx.appcompat.app.AlertDialog;
 
 import com.google.android.material.dialog.MaterialAlertDialogBuilder;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import de.cketti.library.changelog.ChangeLog;
+import nodomain.freeyourgadget.gadgetbridge.GBApplication;
 import nodomain.freeyourgadget.gadgetbridge.R;
 
 public class GBChangeLog extends ChangeLog {
+    private static final Logger LOG = LoggerFactory.getLogger(GBChangeLog.class);
+
     public GBChangeLog(Context context, String css) {
         super(context, css);
     }
 
+    @Override
+    protected SparseArray<ReleaseItem> getMasterChangeLog(boolean full) {
+        if (GBApplication.isNightly()) {
+            try {
+                return readChangeLogFromResource(R.xml.changelog_git, full);
+            } catch (final Exception e) {
+                // Just in case the git changelog is broken somehow..
+                LOG.error("Failed to read git changelog for nightly", e);
+            }
+        }
+
+        return super.getMasterChangeLog(full);
+    }
+
     public AlertDialog getMaterialLogDialog() {
         return getMaterialDialog(isFirstRunEver());
     }