Script to automate the majority of the Java to Kotlin conversion fixes for the Beeline Android app

java-to-kotlin-beeline-android.sh

#!/bin/bash

set -e

rm -f $(find app/src -iname "Triple*.java")

JAVA_FILES=$(find app/src -iname "*.java")
EXISTING_KOTLIN_FILES=$(find app/src -iname "*.kt")

for FILE in $JAVA_FILES ; do
  echo "$FILE"

  sed -i '' -E -e 's/@Inject/@Inject @android.support.annotation.NonNull/g' "$FILE"

  sed -i '' -E -e 's/@Provides/@Provides @android.support.annotation.NonNull/g' "$FILE"

  sed -i '' -E -e 's/(@BindView\([^)]*\))/\1 @android.support.annotation.NonNull/g' "$FILE"

  sed -i '' -E -e 's/(public static BeelineComponent)/@android.support.annotation.NonNull \1/g' "$FILE"

  sed -i '' -E -e 's/import +android\.util\.Pair;//g' "$FILE"
  sed -i '' -E -e 's/import +android\.support\.v4\.util\.Pair;//g' "$FILE"
  sed -i '' -E -e 's/Pair\.create\(/new Pair<>\(/g' "$FILE"
  sed -i '' -E -e 's/Pair::create/Pair::new/g' "$FILE"
  sed -i '' -E -e 's/([^\.])Pair</\1Pair</g' "$FILE"

  sed -i '' -E -e 's/import +co\.beeline\.util\.Triple;//g' "$FILE"
  sed -i '' -E -e 's/Triple::create/kotlin.Triple::new/g' "$FILE"

  sed -i '' -E -e 's/\.first([^\(]|$)/.getFirst()\1/g' "$FILE"
  sed -i '' -E -e 's/\.second([^\(]|$)/.getSecond()\1/g' "$FILE"
  sed -i '' -E -e 's/\.third([^\(]|$)/.getThird()\1/g' "$FILE"
done

for FILE in $EXISTING_KOTLIN_FILES ; do
  echo "$FILE"

  sed -i '' -E -e 's/import +android.util.Pair//g' "$FILE"
  sed -i '' -E -e 's/android\.util\.Pair</Pair</g' "$FILE"
  sed -i '' -E -e 's/Pair\.create/Pair/g' "$FILE"
done

echo ""
echo "Now covert all Java files to Kotlin in Android Studio"
echo "Press return when ready"
read

NEW_KOTLIN_FILES="$(echo "$JAVA_FILES" | sed -E 's/\.java/\.kt/g')"

for FILE in $NEW_KOTLIN_FILES ; do
  echo "$FILE"

  sed -i '' -E -e 's/@Inject/@Inject lateinit/g' "$FILE"

  sed -i '' -E -e 's/(Observable.combineLatest)<[^\({]*>/\1/g' "$FILE"
  sed -i '' -E -e 's/Func[1-9]<[^\({]*> *{/{/g' "$FILE"
  sed -i '' -E -e 's/Action[0-9](<[^\({]*>)? *{/{/g' "$FILE"
  sed -i '' -E -e 's/(Errors.logErrorAndComplete)<[^\({]*>/\1/g' "$FILE"
  sed -i '' -E -e 's/(\.compose)<[^\({]*>/\1/g' "$FILE"
  sed -i '' -E -e 's/(\.map)<[^\({]*>/\1/g' "$FILE"
  sed -i '' -E -e 's/(\.flatMap)<[^\({]*>/\1/g' "$FILE"
  sed -i '' -E -e 's/(\.switchMap)<[^\({]*>/\1/g' "$FILE"
  sed -i '' -E -e 's/(\.subscribe)<[^\({]*>/\1/g' "$FILE"
  sed -i '' -E -e 's/(\.subscribe)\(<[^\({]*>(.*)\)/\1\2/g' "$FILE"
  sed -i '' -E -e 's/(\.bindToLifecycle)<[^\({]*>/\1/g' "$FILE"
  sed -i '' -E -e 's/(\.bindUntilEvent)<[^\({]*>/\1/g' "$FILE"
  sed -i '' -E -e 's/(\.bindUntilRecycled)<[^\({]*>/\1/g' "$FILE"
  sed -i '' -E -e 's/(sendRequest)<[^>]*>\(/\1(/g' "$FILE"
  sed -i '' -E -e 's/@(Observable.combineLatest)/ \1/g' "$FILE"
  sed -i '' -E -e 's/ *__ -> */ /g' "$FILE"

  sed -i '' -E -e 's/@(kotlin\.Pair)/Pair/g' "$FILE"
  sed -i '' -E -e 's/@(kotlin\.Triple)/Triple/g' "$FILE"

  sed -i '' -E -e 's/(@BindView\([^)]*\))( +internal) +/\1\2 lateinit /g' "$FILE"
done

echo ""
echo "Now you'll most likely have some errors to fix"