add ktlint (#2633)

app/build.gradle

@@ -5,6 +5,8 @@ apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
 apply plugin: 'kotlin-kapt'
 apply plugin: 'com.github.zellius.shortcut-helper'
+apply plugin: "org.jmailen.kotlinter"
+
 
 shortcutHelper.filePath = './shortcuts.xml'
 
@@ -264,6 +266,9 @@ androidExtensions {
     experimental = true
 }
 
+preBuild.dependsOn(lintKotlin)
+lintKotlin.dependsOn(formatKotlin)
+
 if (getGradle().getStartParameter().getTaskRequests().toString().contains("Standard")) {
     apply plugin: 'com.google.gms.google-services'
 }

build.gradle.kts

@@ -11,6 +11,7 @@ buildscript {
     dependencies {
         classpath("com.android.tools.build:gradle:3.6.0")
         classpath("com.github.zellius:android-shortcut-gradle-plugin:0.1.2")
+        classpath("org.jmailen.gradle:kotlinter-gradle:2.3.1")
         classpath("com.google.gms:google-services:4.3.3")
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -21,6 +22,7 @@ allprojects {
     repositories {
         google()
         maven { setUrl("https://www.jitpack.io") }
+        maven { setUrl("https://plugins.gradle.org/m2/") }
         jcenter()
     }
 }

ktlintCodeStyle.xml

@@ -0,0 +1,136 @@
+<code_scheme name="Project" version="173">
+  <JetCodeStyleSettings>
+    <option name="PACKAGES_TO_USE_STAR_IMPORTS">
+      <value>
+        <package name="kotlinx.android.synthetic" withSubpackages="true" static="false" />
+      </value>
+    </option>
+    <option name="NAME_COUNT_TO_USE_STAR_IMPORT" value="2147483647" />
+    <option name="NAME_COUNT_TO_USE_STAR_IMPORT_FOR_MEMBERS" value="2147483647" />
+    <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
+  </JetCodeStyleSettings>
+  <codeStyleSettings language="XML">
+    <indentOptions>
+      <option name="CONTINUATION_INDENT_SIZE" value="4" />
+    </indentOptions>
+    <arrangement>
+      <rules>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>xmlns:android</NAME>
+                <XML_ATTRIBUTE />
+                <XML_NAMESPACE>^$</XML_NAMESPACE>
+              </AND>
+            </match>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>xmlns:.*</NAME>
+                <XML_ATTRIBUTE />
+                <XML_NAMESPACE>^$</XML_NAMESPACE>
+              </AND>
+            </match>
+            <order>BY_NAME</order>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>.*:id</NAME>
+                <XML_ATTRIBUTE />
+                <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+              </AND>
+            </match>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>.*:name</NAME>
+                <XML_ATTRIBUTE />
+                <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+              </AND>
+            </match>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>name</NAME>
+                <XML_ATTRIBUTE />
+                <XML_NAMESPACE>^$</XML_NAMESPACE>
+              </AND>
+            </match>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>style</NAME>
+                <XML_ATTRIBUTE />
+                <XML_NAMESPACE>^$</XML_NAMESPACE>
+              </AND>
+            </match>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>.*</NAME>
+                <XML_ATTRIBUTE />
+                <XML_NAMESPACE>^$</XML_NAMESPACE>
+              </AND>
+            </match>
+            <order>BY_NAME</order>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>.*</NAME>
+                <XML_ATTRIBUTE />
+                <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+              </AND>
+            </match>
+            <order>ANDROID_ATTRIBUTE_ORDER</order>
+          </rule>
+        </section>
+        <section>
+          <rule>
+            <match>
+              <AND>
+                <NAME>.*</NAME>
+                <XML_ATTRIBUTE />
+                <XML_NAMESPACE>.*</XML_NAMESPACE>
+              </AND>
+            </match>
+            <order>BY_NAME</order>
+          </rule>
+        </section>
+      </rules>
+    </arrangement>
+  </codeStyleSettings>
+  <codeStyleSettings language="kotlin">
+    <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
+    <option name="LINE_COMMENT_AT_FIRST_COLUMN" value="false" />
+    <option name="LINE_COMMENT_ADD_SPACE" value="true" />
+    <option name="KEEP_BLANK_LINES_IN_DECLARATIONS" value="1" />
+    <option name="KEEP_BLANK_LINES_IN_CODE" value="1" />
+    <option name="KEEP_BLANK_LINES_BEFORE_RBRACE" value="0" />
+    <option name="ALIGN_MULTILINE_PARAMETERS" value="false" />
+    <indentOptions>
+      <option name="CONTINUATION_INDENT_SIZE" value="4" />
+    </indentOptions>
+  </codeStyleSettings>
+</code_scheme>