rhysd/vim-clang-format

Wishlist: auto_format modified lines only?

dnwe opened this issue · 2 comments

dnwe commented

Is it possible to provide g:clang_format#auto_format but which only reformats the lines that have been modified since the buffer was last saved?

rhysd commented

No, it's not possible.

Each chunk of modified lines requires executeing clang-format to format. It'll be a heavy work for Vim and it takes a lot, I think.
Though there is no feature to format modified lines automatically, I think it is better way to format per each modifying with remembering the line when you enter insert mode and invoking clang-format automatically when you leave insert mode. You can hook these points using InsertEnter and InsertLeave events.

rhysd commented

Hi, I added automatic formatting on InsertLeave as a trial at c83f840.

If g:clang_format#auto_format_on_insert_leave is 1, inserted lines are automatically on leaving insert mode. Please be careful because this feature has some side effects.

  • Sometimes auto-formatting moves screen unintentionally.
  • Cursor position history is polluted (Issue #8).