Fix up Jacoco reporting

Blog post coming up explaining all that's going on, because it is massively complicated.

app-test/build.gradle

@@ -3,7 +3,7 @@ apply plugin: 'kotlin'
 apply plugin: 'jacoco'
 apply plugin: 'com.github.kt3k.coveralls'
 
-evaluationDependsOn(":app")
+//evaluationDependsOn(":app:compileDebugJava")
 
 buildscript {
     repositories {
@@ -22,16 +22,22 @@ repositories {
     }
 }
 
-test {
-    testLogging {
-        exceptionFormat = 'full'
-    }
-}
-
 // TODO: Make sure we test against the Debug variant
 def androidModule = project(':app')
 def firstVariant = androidModule.android.applicationVariants.toList().first()
 
+// TODO: Not yet including Spek tests, fix that.
+def testIncludes = [
+        '**/*Test.class'
+]
+def jacocoExcludes = [
+        'android/**',
+        'com/todddavies/**',
+		'com/cmwmobile/**',
+		'org/bspeice/minimalbible/R*',
+		'**/*$$*'
+]
+
 dependencies {
     compile androidModule
 
@@ -46,45 +52,31 @@ dependencies {
     testCompile files(androidModule.plugins.findPlugin("com.android.application").getBootClasspath())
 }
 
-jacocoTestReport {
-    /*
-    Alright, setting up Jacoco the right way is massively confusing.
-    Normally, you'd use something like additionalClassDirs to add the folders you need.
-    However, we want to exclude the android/ folder, and likely will need something else
-    in the future. In order to do this though, we need the doFirst block. See SO here:
-        http://stackoverflow.com/a/17411305/1454178
-
-    Additionally, to properly exclude, we need to run that code outside the doFirst block.
-    No clue why this is, but please don't change this without extensive testing.
-
-    Finally, because we actually exclude these files from the output, they are removed
-    from the actual classpath, meaning no test classes can reference any of the below.
-    Otherwise, I'd remove com/toddddavies/** as well
-    */
-    def jacocoExcludes = [
-            "android/**/*",
-            "com/cmwmobile/**"
-    ]
-    firstVariant.javaCompile.exclude(jacocoExcludes).outputs.files
-
-    doFirst {
-        sourceDirectories = files(androidModule.android.sourceSets.main.java.srcDirs)
-        classDirectories = firstVariant.javaCompile.outputs.files
-    }
-
-    // Back to your regularly scheduled Jacoco
-    reports {
-        xml.enabled true
-        csv.enabled false
-        html.destination "${buildDir}/jacocoHtml"
-    }
+def buildExcludeTree(path, excludes) {
+	def tree = fileTree(path).exclude(excludes)
+	tree
 }
 
-coveralls {
-    sourceDirs = files(androidModule.android.sourceSets.main.java.srcDirs).files.absolutePath
+jacocoTestReport {
+    doFirst {
+		// First we build a list of our base directories
+		def fileList = new ArrayList<String>()
+        def outputsList = firstVariant.javaCompile.outputs.files
+		outputsList.each { fileList.add(it.absolutePath.toString()) }
+
+		// And build a fileTree from those
+		def outputTree = fileList.inject { tree1, tree2 ->
+			buildExcludeTree(tree1, jacocoExcludes) +
+			buildExcludeTree(tree2, jacocoExcludes)
+		}
+		
+		// And finally tell Jacoco to only include said files in the report
+        classDirectories = outputTree
+    }
 }
 
 tasks.withType(Test) {
     scanForTestClasses = false
-    include "**/*Test.class"
-}
+    includes = testIncludes
+}
+