build: apply Ktfmt Gradle plugin

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

build.gradle.kts

@@ -7,6 +7,16 @@ plugins {
     `aps-plugin`
 }
 
+buildscript {
+    dependencies {
+        classpath(Plugins.ktfmtGradlePlugin)
+    }
+}
+
+allprojects {
+    apply(plugin = "com.ncorti.ktfmt.gradle")
+}
+
 subprojects {
     configurations.all {
         resolutionStrategy.dependencySubstitution {

buildSrc/build.gradle.kts

@@ -37,6 +37,7 @@ dependencies {
     implementation(Plugins.dokkaPlugin)
     implementation(Plugins.downloadTaskPlugin)
     implementation(Plugins.kotlinGradlePlugin)
+    implementation(Plugins.ktfmtGradlePlugin)
     implementation(Plugins.mavenPublishPlugin)
     implementation(Plugins.semver4j)
 }

buildSrc/src/main/java/Dependencies.kt

@@ -11,6 +11,7 @@ object Plugins {
     const val dokkaPlugin = "org.jetbrains.dokka:dokka-gradle-plugin:1.4.20"
     const val downloadTaskPlugin = "de.undercouch:gradle-download-task:4.1.1"
     const val kotlinGradlePlugin = "org.jetbrains.kotlin:kotlin-gradle-plugin:$KOTLIN_VERSION"
+    const val ktfmtGradlePlugin = "com.ncorti.ktfmt.gradle:plugin:0.4.0"
     const val mavenPublishPlugin = "com.vanniktech:gradle-maven-publish-plugin:0.13.0"
     const val semver4j = "com.vdurmont:semver4j:3.1.0"
 }

buildSrc/src/main/java/Ktfmt.kt

@@ -0,0 +1,11 @@
+/*
+ * Copyright © 2014-2020 The Android Password Store Authors. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+import com.ncorti.ktfmt.gradle.KtfmtExtension
+
+fun KtfmtExtension.configureKtfmt() {
+    googleStyle()
+    maxWidth.set(120)
+}

buildSrc/src/main/java/PasswordStorePlugin.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.ncorti.ktfmt.gradle.KtfmtExtension
+import com.ncorti.ktfmt.gradle.KtfmtPlugin
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.api.plugins.JavaLibraryPlugin
@@ -41,6 +43,9 @@ class PasswordStorePlugin : Plugin<Project> {
                     project.extensions.getByType<BaseAppModuleExtension>().configureBuildSigning(project)
                     project.extensions.getByType<TestedExtension>().configureCommonAndroidOptions()
                 }
+                is KtfmtPlugin -> {
+                    project.extensions.getByType<KtfmtExtension>().configureKtfmt()
+                }
             }
         }
     }