Fix #2198: Introduce pre push hook for ktlint

scripts/kotlin-lint-check.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+echo "********************************"
+echo "Checking code formatting"
+echo "********************************"
+
+java -jar ../oppia-android-tools/ktlint --android app/src/**/*.kt data/src/**/*.kt domain/src/**/*.kt testing/src/**/*.kt utility/src/**/*.kt
+
+status=$?
+
+if [ "$status" = 0 ] ; then
+  echo "Lint completed successfully."
+  exit 0
+else
+  echo "********************************"
+  echo "Ktlint issue found."
+  echo "Please fix the above issues.
+  You can also use the ktlint -F --android domain/src/**/*.kt utility/src/**/*.kt data/src/**/*.kt app/src/**/*.kt testing/src/**/*.kt
+  command to fix the most common issues."
+  echo "Please note, there might be a possibility where the above command will not fix the issue.
+  In that case, you will have to fix it yourself."
+  echo "********************************"
+  exit 1
+fi

scripts/pre-push.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+# This script will run the pre-push checks in the given order
+#  - ktlint
+#  - (others in the future)
+
+bash scripts/kotlin-lint-check.sh
+
+# TODO(#1736): Add Bazel Linter to the project
+# TODO(#1735): Add Java Linter to the project
+# TODO(#970): Add XML Linter to the project
+# TODO(#2097): Add Buf Linter to the project

scripts/setup.sh

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+# INSTRUCTIONS:
+# This script will move the pre-push hook from script folder to
+# the .git/hooks folder
+#
+# Run the script from the oppia-android root folder:
+#
+#   bash scripts/setup.sh
+#
+# NOTE: this script should be run once after the initial codebase setup
+
+# Move file from script folder to .git/hooks folder
+cp scripts/pre-push.sh .git/hooks/pre-push
+
+# Download ktlint
+KTLINT="0.37.1"
+echo Using Ktlint $KTLINT
+mkdir -p ../oppia-android-tools
+cd ../oppia-android-tools
+curl -sSLOC - https://github.com/pinterest/ktlint/releases/download/$KTLINT/ktlint
+chmod a+x ktlint
+echo Ktlint file downloaded