Convert java to kotlin as usual and run script in the idea project dir (java -jar j2kt-commiter.jar). VCS mappings are used to support several repositories.
To dry-run (no commits, no file renaming - only log) pass true as a first argument: java -jar j2kt-commiter.jar true
Converted files will be committed and history is preserved (only and only converted files will be committed — working directory can be dirty).
What script does:
- kotlin file renamed to java file (foo.kt -> foo.java).
- first commit.
- foo.java renamed back to foo.kt.
- second (and last) commit.
Please note — only and only converted files will be committed, so, you should commit another changed files (e.g. if some java file modified to use kotlin API).
If something went wrong, use git reset HEAD~1 to delete your last commit and VCS -> Local History to restore your changes.