Haruki Matsui

[ddu-source-rg](https://github.com/shun/ddu-source-rg) with `'autoAction': {'name': 'preview'}` ui-ff's uiParams. 

[ddu-vim-ui-select](https://github.com/matsui54/ddu-vim-ui-select), which replaces Neovim's `vim.ui.select` with ddu. 

Yes, it does not implement new ui. It's intended to use with ui-ff.

[ddu-source-line](https://github.com/Shougo/ddu-source-line) [ddu-filter-kensaku](https://github.com/Milly/ddu-filter-kensaku)