Add ktlint to circleci config

.circleci/config.yml

@@ -1,4 +1,4 @@
-version: 2
+version: 2.1
 jobs:
   build:
     docker:
@@ -38,8 +38,12 @@ jobs:
           path: ~/test-results
       - store_artifacts:
           path: ~/test-results/junit
+      - persist_to_workspace:
+          root: .
+          paths:
+            - .
 
-  release:
+  ktlint:
     docker:
       - image: circleci/openjdk:8-jdk
     working_directory: ~/protok
@@ -48,25 +52,26 @@ jobs:
       # Customize the JVM maximum heap limit
       JVM_OPTS: -Xmx3200m
       TERM: dumb
-    branches:
-      only:
-        - master
     steps:
-      - checkout
-
-      # Download and cache dependencies
-      - restore_cache:
-          keys:
-            - v1-dependencies-{{ checksum "build.gradle" }}
-            # fallback to using the latest cache if no exact match is found
-            - v1-dependencies-
-
-      - run: gradle dependencies
-
-      - save_cache:
-          paths:
-            - ~/.gradle
-          key: v1-dependencies-{{ checksum "build.gradle" }}
+      - attach_workspace:
+          at: .
+      - run:
+          name: Install ktlint
+          command: |
+            curl -sSLO https://github.com/pinterest/ktlint/releases/download/0.34.2/ktlint
+            chmod a+x ktlint
+            echo 'export PATH=/home/circleci/repo:$PATH' >> $BASH_ENV
+            source $BASH_ENV
+      - run:
+          name: Put comments indicated by Danger
+          command: |
+            gem install bundle
+            bundle install --path vendor/bundle
+            bundle exec danger --dangerfile=Dangerfile --danger_id="danger"
+          when: always
 
-      # run tests!
-      - run: gradle jar
+workflows:
+  branch:
+    jobs:
+      - build
+      - ktlint

Dangerfile

@@ -0,0 +1,4 @@
+# Stop reporting warnings/errors on the code out of range
+github.dismiss_out_of_range_messages
+
+ktlint.lint(inline_mode: true)

Gemfile

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+source "https://rubygems.org"
+
+gem 'danger'
+gem 'danger-ktlint'