expose jgitver metadatas as project extension properties

jgitver metadatas are accessible using the syntax 'project.ext.metadata' where metadata is a jgitver metadata name in lowercase
for example 'project.ext.git_sha1_full'

fixes #6

README.md

@@ -47,9 +47,9 @@ Finally have a look at the [configuration](#configuration) paragraph to have ful
 
 ### Tasks
 
-#### Since 0.2.0
+#### Version
 
-The plugin automatically registers a task `version` which you can call to print out the calculated version of your project:
+Since 0.2.0 the plugin automatically registers a task `version` which you can call to print out the calculated version of your project:
 
 ```
 $ ./gradlew version
@@ -61,9 +61,7 @@ BUILD SUCCESSFUL
 Total time: 5.769 secs
 ```
 
-#### Before 0.2.0
-
-In order to know the current version of your project, just print out the version in a task looking like the following:
+Before 0.2.0, in order to know the current version of your project, just print out the version in a task looking like the following:
 
 ```
 task version {
@@ -121,6 +119,25 @@ The plugin used [jgitver](https://github.com/McFoggy/jgitver) with the following
 - _useDistance_: `true`
 - _useGitCommitId_: `false`
 
+### Metadatas
+
+Since `0.3.0`, jgitver [Metadatas](https://github.com/jgitver/jgitver/blob/master/src/main/java/fr/brouillard/oss/jgitver/metadata/Metadatas.java#L25) are exposed via gradle extension properties using the Metadata name in lower case.
+
+For example, one could enhance it's jar Manifest with the git commit id using:
+
+```
+apply plugin: 'java'
+apply plugin: 'fr.brouillard.oss.gradle.jgitver'
+
+jar {
+    doFirst {
+        manifest {
+            manifest.attributes 'X-GIT-SHA1': "$project.ext.git_sha1_full"
+        }
+    }
+}
+```
+
 ## Local build & sample test project
 
 - `$ ./gradlew install` will install the current version inside the local maven repository

src/main/java/fr/brouillard/oss/gradle/plugins/JGitverPlugin.java

@@ -1,10 +1,14 @@
 package fr.brouillard.oss.gradle.plugins;
 
+import java.util.Arrays;
+import java.util.Locale;
+
 import org.gradle.api.Action;
 import org.gradle.api.Plugin;
 import org.gradle.api.Project;
 
 import fr.brouillard.oss.jgitver.GitVersionCalculator;
+import fr.brouillard.oss.jgitver.metadata.Metadatas;
 
 public class JGitverPlugin implements Plugin<Project> {
     @Override
@@ -23,16 +27,25 @@ public void execute(Project evaluatedProject) {
                     jgitverConfiguration = new JGitverPluginExtension();
                 }
 
-                String gitCalculatedVersion = GitVersionCalculator.location(project.getRootDir())
+                GitVersionCalculator versionCalculator = GitVersionCalculator.location(project.getRootDir())
                         .setMavenLike(jgitverConfiguration.mavenLike)
                         .setAutoIncrementPatch(jgitverConfiguration.autoIncrementPatch)
                         .setUseDistance(jgitverConfiguration.useDistance)
                         .setUseGitCommitId(jgitverConfiguration.useGitCommitID)
                         .setGitCommitIdLength(jgitverConfiguration.gitCommitIDLength)
-                        .setNonQualifierBranches(jgitverConfiguration.nonQualifierBranches).getVersion();
+                        .setNonQualifierBranches(jgitverConfiguration.nonQualifierBranches);
 
+                String gitCalculatedVersion = versionCalculator.getVersion();
                 project.setVersion(gitCalculatedVersion);
                 project.getAllprojects().forEach(subproject -> subproject.setVersion(gitCalculatedVersion));
+
+                Arrays.asList(Metadatas.values()).forEach(metadata -> {
+                    versionCalculator.meta(metadata).ifPresent(metadataValue -> {
+                        project.getExtensions().getExtraProperties().set(metadata.name().toLowerCase(Locale.ENGLISH), metadataValue);
+                        project.getAllprojects().forEach(
+                                subproject -> subproject.getExtensions().getExtraProperties().set(metadata.name().toLowerCase(Locale.ENGLISH), metadataValue));
+                    });
+                });
             }
         });
     }