Add a method to help manage JavaCPP presets

README.markdown

@@ -10,6 +10,28 @@ In your `project/plugins.sbt`:
 addSbtPlugin("com.beachape" % "sbt-javacpp" % "1.0")
 ```
 
+If you want to add a dependency on a JavaCPP preset in your project, the following will do that for you, taking care
+of adding the proper preset for your target platform as well:
+
+```scala
+// in build.sbt
+import import com.beachape.sbt.javacpp.{ Plugin => JavaCppPlugin }
+
+JavaCppPlugin.javaCppPresetDependency("opencv")
+```
+
+## Customisation
+
+By default, this plugin will download the appropriate binaries for the platform of the computer currently
+running SBT, you can modify this by setting it to another platform (for example, if you want to compile JARs to be run
+on other platforms)
+
+```scala
+javaCppPlatform := "android-arm"
+```
+
+Alternatively, you can set the target platform by passing a System Property: `sbt.javacpp.platform`
+
 ## Licence
 
 The MIT License (MIT)

build.sbt

@@ -1,6 +1,6 @@
 name := """sbt-javacpp"""
 
-version := "1.0"
+version := "1.1-SNAPSHOT"
 
 organization := "com.beachape"
 

src/main/scala/com/beachape/sbt/javacpp/Plugin.scala

@@ -35,4 +35,18 @@ object Plugin extends AutoPlugin {
 
   override def trigger: PluginTrigger = allRequirements
 
+  /**
+   * Given the name of a JavaCpp preset library, appends the proper preset native wrapper dependencies (according to the javaCppPlatform setting)
+   */
+  def javaCppPresetDependency(javaCppPresetLib: String): Def.Setting[Seq[ModuleID]] = {
+    import autoImport._
+    libraryDependencies <++= (javaCppPlatform, javaCppVersion, javaCppPresetsVersion) {
+      (resolvedJavaCppPlatform, resolvedJavaCppVersion, resolvedJavaCppPresetsVersion) =>
+        Seq(
+          "org.bytedeco.javacpp-presets" % javaCppPresetLib % s"$resolvedJavaCppPresetsVersion-$resolvedJavaCppVersion" classifier "",
+          "org.bytedeco.javacpp-presets" % javaCppPresetLib % s"$resolvedJavaCppPresetsVersion-$resolvedJavaCppVersion" classifier resolvedJavaCppPlatform
+        )
+    }
+  }
+
 }