deoplete

~ The dark powered auto completion plugin for neovim ~

Presented by Shougo

Introduction

● This slide is English for the foreign people● But the talk is Japanese for the Japanese

people● The slide may contain spiritual topic or

Chuunibyou( 厨二病 )● These are feature

Self-introduction

● Shougo● I am called as “ 暗黒美夢王” . ● Pronounces it “Uncock Vim Awe”.● Some people call me as “the sith lord of Vim

plugins”.● Text editor is all of my life● My previous works: neocomplete,

neobundle, neosnippet, unite, vimfiler, vimshell, etc...

Today's topic

● Deoplete plugin

https://github.com/Shougo/deoplete.nvim

● It is the first asynchronous completion plugin for neovim

● You don't have to be annoying the completion blocks!

● If you don't know about neovim, please read my previous presentation.

http://www.slideshare.net/Shougo/lets-talk-about-neovim

Why deoplete is created?

● My most concern is to block Vim in the completion

● if_lua is faster than VimL. But it also blocks● Tarruda(neovim founder) said

Wow!!Note: It is free translation

But

● The hell has been started from here...

Needed works (1/4)

● Python3 support– No if_lua support in neovim yet– I don't want to create new

Python2 plugin in 2015– I have added if_python3 feature

based on if_python2 in neovim– Thanks the neovim reviewers!

Needed works (2/4)

● complete() bug fix– It is needed for deoplete, but it is

not tested well– Thanks the vim-jp and neovim

reviewers!

Needed works (3/4)

● v:completed_item and completeopt patches– It is needed for auto completion

plugins– Thanks the vim-jp and neovim

reviewers!

Needed works (4/4)

● Understand remote plugin features– Less documentation– Less examples– Hard to debug

Deoplete original features (1/3)

● Asynchronous call omnifunc– But the omnifunc which move

cursors(side effect) is not supported

– For example: htmlcomplete– Synchronous call omnifunc is

also available like neocomplete

Deoplete original features (2/3)

● Python3 sources instead of VimL– You don't have to write VimL– You can wrap VimL functions in

the source

Deoplete original features (3/3)

● Better buffer source– You don't have to know the line is

cached if it is not large files– The lines are analyzed like built-in

buffer completion– You must wait to complete in

editing large files, but it is non blocking!

Sources

● Built-in– buffer, tag, file, omni, member,

dictionary● External

– Neco-ghc, neosnippet, neco-look, neco-vim, neco-syntax, vim-racer, vimshell

Installation

1.Clone Deoplete source$ git clone https://github.com/Shougo/deoplete.nvim

2.Install neovim$ git clone https://github.com/neovim/neovim

3.Install neovim-python3$ (sudo) pip3 install neovim

Demo

● Edit eval.c (22000 lines) with deoplete + neovim

● Edit eval.c (22000 lines) with neocomplete + Vim

● “Behold Vimmers, this is THE real asynchronous!”

FAQ (1)

● Is Deoplete is faster than neocomplete?● I think neocomplete is faster because of

if_lua power● The asynchronous is to skip the completion

if your input is too fast ● So, you should use deoplete in newer

machine

FAQ (2)

● Deoplete does support any of languages?● Deoplete can call omnifunc automatically● Or you can create the source for it● Why don't you create the source?● :help deoplete-create-source

In the future

● Deoplete version 1.0 will be released after the presentation!

● After version 1.0:– More customization– Improve file source behavior– Implement more features in neocomplete

● Rewrite unite.vim for neovim(VimConf2016 presentation)

Fin

● If you think “Deoplete is nice!”, please support neovim project by money or code.

https://salt.bountysource.com/teams/neovim https://github.com/neovim/neovim/issues

● Deoplete depends on the neovim's features!