build: configure Spotless

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

buildSrc/src/main/java/LobstersPlugin.kt

@@ -7,6 +7,8 @@ import com.android.build.gradle.TestedExtension
 import com.android.build.gradle.internal.dsl.BaseAppModuleExtension
 import com.android.build.gradle.internal.plugins.AppPlugin
 import com.android.build.gradle.internal.plugins.LibraryPlugin
+import com.diffplug.gradle.spotless.SpotlessExtension
+import com.diffplug.gradle.spotless.SpotlessPlugin
 import com.squareup.sqldelight.gradle.SqlDelightExtension
 import com.squareup.sqldelight.gradle.SqlDelightPlugin
 import org.gradle.api.Plugin
@@ -52,6 +54,9 @@ class LobstersPlugin : Plugin<Project> {
         is SqlDelightPlugin -> {
           project.extensions.getByType<SqlDelightExtension>().configureLobstersDatabase()
         }
+        is SpotlessPlugin -> {
+          project.extensions.getByType<SpotlessExtension>().configure()
+        }
       }
     }
   }

buildSrc/src/main/java/SpotlessConfig.kt

@@ -0,0 +1,15 @@
+import com.diffplug.gradle.spotless.SpotlessExtension
+
+internal fun SpotlessExtension.configure() {
+  ratchetFrom = "origin/develop"
+  kotlin {
+    ktfmt().googleStyle()
+    target("src/**/*.kt", "**/*.kts")
+  }
+  format("xml") {
+    target("**/*.xml")
+    trimTrailingWhitespace()
+    indentWithSpaces()
+    endWithNewline()
+  }
+}