Credit @hacki11 for the contribution, and improve docs for new feature.

Author: nedtwigg

CHANGES.md

@@ -4,6 +4,7 @@
 
 - Added `addBuildSrc()` method to Oomph configuration.
 - Bump bndlib from `3.4.0` to `3.5.0`.
+- `p2asmaven` now supports [slicing options](https://wiki.eclipse.org/Equinox/p2/Ant_Tasks#SlicingOptions) thanks to [@hacki11](https://github.com/hacki11). ([#41](https://github.com/diffplug/goomph/pull/41))
 
 ### Version 3.8.1 - October 13th 2017 ([javadoc](http://diffplug.github.io/goomph/javadoc/3.8.1/), [jcenter](https://bintray.com/diffplug/opensource/goomph/3.8.1/view))
 

README.md

@@ -117,6 +117,7 @@ Below is an index of Goomph's capabilities, along with links to the javadoc wher
 * Thanks to Stefan Oehme for his feedback on Goomph's design.
 * Thanks to Neil Fraser of Google for [diff-match-patch](https://code.google.com/p/google-diff-match-patch/) which is very helpful for testing.
 * Thanks to Thipor Kong for his [handy windows cmdline length workaround for the classpath](https://discuss.gradle.org/t/javaexec-fails-for-long-classpaths-on-windows/15266).
+* Thanks to [hacki11](https://github.com/hacki11) for [slicingOptions in p2asmaven](https://github.com/diffplug/goomph/pull/41).
 * Formatted by [spotless](https://github.com/diffplug/spotless).
 * Bugs found by [findbugs](http://findbugs.sourceforge.net/).
 * Built by [gradle](http://gradle.org/).

src/main/java/com/diffplug/gradle/p2/AsMavenPlugin.java

@@ -117,7 +117,22 @@
  * 
  * If you think this is too hard, vote for [this issue on GitHub](https://github.com/diffplug/goomph/issues/12)
  * and [this bug on eclipse](https://bugs.eclipse.org/bugs/show_bug.cgi?id=382875) and we can make it easier.
+ *
+ * ## Slicing options
+ *
+ * You can control how the iu's are resolved using
+ *
+ * ```groovy
+ * p2AsMaven {
+ *   group 'eclipse-deps', {
+ *     ...
+ *     slicingOption 'latestVersionOnly', 'true'
+ *   }
+ * }
+ * ```
  * 
+ * You can see all the available slicing options [here](https://wiki.eclipse.org/Equinox/p2/Ant_Tasks#SlicingOptions).
+ *
  * ## Acknowledgements and comparisons to other options
  * 
  * Inspired by Andrey Hihlovskiy's [unpuzzle](https://github.com/akhikhl/unpuzzle).

src/main/java/com/diffplug/gradle/p2/P2Model.java

@@ -162,6 +162,7 @@ public void addArtifactRepoBundlePool() {
 		addArtifactRepo(GoomphCacheLocations.bundlePool());
 	}
 
+	/** https://wiki.eclipse.org/Equinox/p2/Ant_Tasks#SlicingOptions */
 	public void addSlicingOption(String option, String value) {
 		slicingOptions.put(option, value);
 	}