Gradle: create build info in assets folder while build - no compile error within Eclipse - with helper function in AppUtils

.gitignore

@@ -32,3 +32,4 @@ out/
 .gradle
 local.properties
 git.xml
+build.info

mobile/com.sap.sailing.android.shared/src/com/sap/sailing/android/shared/util/AppUtils.java

@@ -3,8 +3,20 @@ package com.sap.sailing.android.shared.util;
 import android.content.Context;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager.NameNotFoundException;
+import android.util.Log;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
 
 public class AppUtils {
+
+    private final static String TAG = AppUtils.class.getName();
+
+    private AppUtils() {
+
+    }
+
     public static PackageInfo getPackageInfo(Context app) {
         try {
             return app.getPackageManager().getPackageInfo(app.getPackageName(), 0);
@@ -12,4 +24,25 @@ public class AppUtils {
             return null;
         }
     }
+
+    public static String getBuildInfo(Context context) {
+        String buildInfo = "";
+        BufferedReader reader = null;
+        try {
+            reader = new BufferedReader(new InputStreamReader(context.getAssets().open("build.info")));
+            buildInfo = reader.readLine();
+        } catch (IOException e) {
+            Log.d(TAG, "Can't open file with build info", e);
+        } finally {
+            if (reader != null) {
+                try {
+                    reader.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+
+        return buildInfo;
+    }
 }

mobile/git.gradle

@@ -1,30 +1,44 @@
-/**
- * returns current git hash
- */
-def getGitHash = { ->
-    def stdout = new ByteArrayOutputStream()
-    exec {
-        commandLine "git", "log", "-n", "1", "--format='%h'"
-        standardOutput = stdout
-    }
-    return stdout.toString().trim().replace("'", "")
-}
-
-/**
- * set git hash into git.xml
- */
 preBuild.doLast {
-    copy {
-        from ("../git.template.xml")
-
-        into ("res/values")
-
-        rename {
-            String fileName -> fileName.replace(".template", "")
-        }
-
-        filter {
-            String line -> line.replaceAll("#GITHASH#", getGitHash())
-        }
+    // get the current commit hash in git
+    def git_version = new ByteArrayOutputStream()
+    exec {
+        commandLine 'git', 'log', '-1', '--format=%h'
+        standardOutput = git_version
     }
-}
+    git_version = git_version.toString().trim()
+
+    // get the current git branch, if any
+    def git_branch = new ByteArrayOutputStream()
+    exec {
+        commandLine 'git', 'symbolic-ref', '--short', '-q', 'HEAD'
+        standardOutput = git_branch
+        // ignore error output as we might not be on a branch
+        ignoreExitValue = true
+    }
+
+    // if we are not on a branch, try to get a tag for the commit
+    def git_branch_or_tag
+    if (git_branch.size() > 0) {
+        git_branch_or_tag = git_branch.toString().trim()
+    } else {
+        def git_tag = new ByteArrayOutputStream()
+        exec {
+            commandLine 'git', 'describe', '--tags', '--exact-match'
+            standardOutput = git_tag
+            // ignore error output
+            errorOutput = new ByteArrayOutputStream()
+            ignoreExitValue = true
+        }
+
+        git_branch_or_tag = git_tag.toString().trim()
+    }
+
+    def build_time = new Date().toString()
+
+    // save the combined build info into assets/build.info file
+    def result_line = git_branch_or_tag + "-" + git_version + " (" +
+            build_time + ")\n"
+    def assetsDir = android.sourceSets.main.assets.srcDirs.toArray()[0]
+    def buildInfoFile = new File(assetsDir, 'build.info').getAbsolutePath()
+    new File(buildInfoFile).write(result_line)
+}

mobile/git.template.xml

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<resources>
-
-    <string name="git_hash" translatable="false">#GITHASH#</string>
-
-</resources>