Introduce 'app.version' property and remove hardcoded version

build.gradle

@@ -1,3 +1,4 @@
+import org.apache.tools.ant.filters.ReplaceTokens
 import org.apache.tools.ant.taskdefs.condition.Os
 
 plugins {
@@ -25,6 +26,13 @@ run {
     }
 }
 
+processResources {
+    from(sourceSets.main.resources.srcDirs) {
+        include '**/*.properties'
+        filter(ReplaceTokens, tokens: [ 'app.version': project.version ])
+    }
+}
+
 repositories {
     jcenter()
     maven { url 'http://partnerdemo.artifactoryonline.com/partnerdemo/libs-snapshots-local' }

src/main/java/io/bitsquare/app/BitsquareEnvironment.java

@@ -42,6 +42,8 @@ import static com.google.common.base.Preconditions.checkNotNull;
 
 public class BitsquareEnvironment extends StandardEnvironment {
 
+    public static final String APP_VERSION_KEY = "app.version";
+
     public static final String USER_DATA_DIR_KEY = "user.data.dir";
     public static final String DEFAULT_USER_DATA_DIR = defaultUserDataDir();
 
@@ -96,7 +98,7 @@ public class BitsquareEnvironment extends StandardEnvironment {
             setProperty(APP_NAME_KEY, appName);
 
             setProperty(UserAgent.NAME_KEY, appName);
-            setProperty(UserAgent.VERSION_KEY, "0.1");
+            setProperty(UserAgent.VERSION_KEY, BitsquareEnvironment.this.getRequiredProperty(APP_VERSION_KEY));
 
             setProperty(WalletFacade.DIR_KEY, appDataDir);
             setProperty(WalletFacade.PREFIX_KEY, appName);

src/main/resources/bitsquare.properties

@@ -1 +1 @@
-# Empty for now; see ConfigLoader
+app.version=@app.version@

src/test/java/io/bitsquare/app/BitsquareEnvironmentTests.java

@@ -17,15 +17,18 @@
 
 package io.bitsquare.app;
 
+import io.bitsquare.btc.UserAgent;
+
 import org.junit.Test;
 
 import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.Environment;
 import org.springframework.core.env.MutablePropertySources;
 import org.springframework.core.env.PropertySource;
 import org.springframework.mock.env.MockPropertySource;
 
 import static io.bitsquare.app.BitsquareEnvironment.*;
-import static org.hamcrest.CoreMatchers.equalTo;
+import static org.hamcrest.CoreMatchers.*;
 import static org.junit.Assert.*;
 import static org.springframework.core.env.PropertySource.named;
 import static org.springframework.core.env.StandardEnvironment.SYSTEM_ENVIRONMENT_PROPERTY_SOURCE_NAME;
@@ -58,4 +61,15 @@ public class BitsquareEnvironmentTests {
         assertThat(env.getProperty("key.x"), equalTo("x.commandline")); // commandline value wins due to precedence
         assertThat(env.getProperty("key.y"), equalTo("y.env")); // env value wins because it's the only one available
     }
+
+    @Test
+    public void bitsquareVersionShouldBeAvailable() {
+        // we cannot actually test for the value because (a) it requires Gradle's
+        // processResources task filtering (which does not happen within IDEA) and
+        // (b) because we do not know the specific version to test for. Instead just
+        // test that the property has been made available.
+        Environment env = new BitsquareEnvironment(new MockPropertySource());
+        assertThat(env.containsProperty(APP_VERSION_KEY), is(true));
+        assertThat(env.getProperty(UserAgent.VERSION_KEY), equalTo(env.getProperty(APP_VERSION_KEY)));
+    }
 }