❤️ for my favorite editor
This is a fast, extensible, async completion framework for neovim. For more information about plugin implementation, please read the Why section.
Future updates, announcements, screenshots will be posted here. Subscribe it if you are interested.
- Features
- Scoping Sources:
- Completion Sources
- How to extend this framework?
- Requirements
- Installation
- Optional Configuration Tips
- Why?
- FAQ
- Trouble-shooting
- Related Projects
- Asynchronous completion support like deoplete.
- Faster, all completions should run in parallel.
- Smarter on files with different languages, for example, css/javascript completion in html style/script tag.
- Extensible async vimscript API and python3 API.
- Function parameter expansion via Ultisnips, neosnippet.vim or vim-snipmate.
- Language specific completion for markdown
- Javascript code completion in html script tag
- Css code completion in html style tag
Language / Description | Repository |
---|---|
Word from current buffer | builtin |
Word from tmux session | builtin |
ctags completion | builtin |
Filepath completion | builtin |
Python | builtin, requires jedi |
Css | builtin, requires csscomplete#CompleteCSS |
Golang | builtin, requires gocode |
Ultisnips hint | builtin, requires Ultisnips |
Snipmate hint | builtin, requires vim-snipmate |
neosnippet hint | builtin, requires neosnippet.vim |
Language Server Protocal | LanguageClient-neovim |
C/C++ | clang_complete |
Javascript | nvim-cm-tern |
Javascript | nvim-cm-flow |
elm | ncm-elm-oracle |
Clojure | async-clj-omni |
Rust | nvim-cm-racer |
Vimscript | neco-vim |
Ruby | ncm-rct-complete |
PHP | LanguageServer-php-neovim |
Swift | nvim-cm-swift-completer |
gtags completion | gen_tags.vim |
syntax completion | neco-syntax |
include completion | neoinclude |
github completion | ncm-github |
mutt mails | #97 mutt-aliases.vim |
deoplete | #50 deoplete |
:help ncm-source-examples
for minimal examples- Some real, small examples: github-emoji, nvim-cm-racer
Please upload your new plugin, or possibly screenshot here after you created the extension.
has("python3")
.- If you're on vim8, vim-hug-neovim-rpc.
- Assuming you're using vim-plug
" the framework
Plug 'roxma/nvim-completion-manager'
- If you are vim8 user, you'll need vim-hug-neovim-rpc. The vim8 support layer is still experimental, please 'upgrade' to neovim if it's possible.
" Requires vim8 with has('python') or has('python3')
" Requires the installation of msgpack-python. (pip install msgpack-python)
if !has('nvim')
Plug 'roxma/vim-hug-neovim-rpc'
endif
- Install pip modules for your neovim python3:
# neovim is the required pip module
# jedi for python completion
# mistune for markdown completion (optional)
# psutil (optional)
# setproctitle (optional)
pip3 install --user neovim jedi mistune psutil setproctitle
(Optional) It's easier to use python-support.nvim to help manage your pip modules for neovim:
Plug 'roxma/python-support.nvim'
" for python completions
let g:python_support_python3_requirements = add(get(g:,'python_support_python3_requirements',[]),'jedi')
" language specific completions on markdown file
let g:python_support_python3_requirements = add(get(g:,'python_support_python3_requirements',[]),'mistune')
" utils, optional
let g:python_support_python3_requirements = add(get(g:,'python_support_python3_requirements',[]),'psutil')
let g:python_support_python3_requirements = add(get(g:,'python_support_python3_requirements',[]),'setproctitle')
- (Optional) Install typical completion sources
" (optional) javascript completion
Plug 'roxma/nvim-cm-tern', {'do': 'npm install'}
" (optional) language server protocol framework
Plug 'autozimu/LanguageClient-neovim', { 'do': ':UpdateRemotePlugins' }
" (optional) php completion via LanguageClient-neovim
Plug 'roxma/LanguageServer-php-neovim', {'do': 'composer install && composer run-script parse-stubs'}
autocmd FileType php LanguageClientStart
- Supress the annoying completion messages:
" don't give |ins-completion-menu| messages. For example,
" '-- XXX completion (YYY)', 'match 1 of 2', 'The only match',
set shortmess+=c
- When the
<Enter>
key is pressed while the popup menu is visible, it only hides the menu. Use this mapping to hide the menu and also start a new line.
inoremap <expr> <CR> (pumvisible() ? "\<c-y>\<cr>" : "\<CR>")
- When using
CTRL-C
key to leave insert mode, it does not trigger the autocmdInsertLeave
. You should useCTRL-[
, or map the<c-c>
to<ESC>
.
inoremap <c-c> <ESC>
- Use
<TAB>
to select the popup menu:
inoremap <expr> <Tab> pumvisible() ? "\<C-n>" : "\<Tab>"
inoremap <expr> <S-Tab> pumvisible() ? "\<C-p>" : "\<S-Tab>"
- If 'omnifunc' is the only available option, you may register it as a source for NCM.
" css completion via `csscomplete#CompleteCSS`
" The `'cm_refresh_patterns'` is PCRE.
" Be careful with `'scoping': 1` here, not all sources, especially omnifunc,
" can handle this feature properly.
au User CmSetup call cm#register_source({'name' : 'cm-css',
\ 'priority': 9,
\ 'scoping': 1,
\ 'scopes': ['css','scss'],
\ 'abbreviation': 'css',
\ 'word_pattern': '[\w\-]+',
\ 'cm_refresh_patterns':['[\w\-]+\s*:\s+'],
\ 'cm_refresh': {'omnifunc': 'csscomplete#CompleteCSS'},
\ })
Warning: omnifunc
is implemented in a synchronouse style, and
vim-vimscript is single threaded, it would potentially block the ui with the
introduction of a heavy weight omnifunc
, for example the builtin
phpcomplete. If you get some time, please try implementing a source for NCM as
a replacement for the old style omnifunc.
-
There's no guarantee that this plugin will be compatible with other completion plugin in the same buffer. Use
let g:cm_smart_enable=0
andcall cm#enable_for_buffer()
to use this plugin for specific buffer. -
This example shows how to disable NCM's builtin tag completion. It's also possible to use
g:cm_sources_override
to override other default options of a completion source.
let g:cm_sources_override = {
\ 'cm-tags': {'enable':0}
\ }
This project was started just for fun, and it's working pleasingly for me now. However, it seems there's lots of differences between deoplete, YCM, and nvim-completion-manager, by implementation.
I haven't read the source of YCM yet. So here I'm describing the basic implementation of NCM (short for nvim-completion-manager) and some of the differences between deoplete and this plugin.
Each completion source should be a thread or a standalone process, the manager
notifies the completion source for any text changing, even when popup menu is
visible. The completion source notifies the manager if there's any complete
matches available. After some basic priority sorting between completion
sources, and some simple filtering, the completion popup menu will be
triggered with the complete()
function by the completion manager.
If some of the completion source is calculating matches for a long long time, the popup menu will still be shown quickly if other completion sources work properly. And if the user hasn't changed anything, the popup menu will be updated after the slow completion source finishes the work.
As the time as of this plugin being created, the completion sources of
deoplete are gathered with gather_candidates()
of the Source
object,
inside a for loop, in deoplete's process. A slow completion source may defer
the display of popup menu. Of course it will not block the ui.
The good news is that deoplete has supported async gather_candidates
now.
But still, NCM is potentially faster because all completion sources run in
parallel.
I write markdown files with code blocks quite often, so I've also implemented language specific completion for markdown file. This is a framework feature, which is called scoping. It should work for any markdown code block whose language completion source is avaible to NCM. I've also added support for javascript completion in script tag of html files, and css completion in style tag.
The idea was originated in vim-syntax-compl-pop. Since it's pure vimscript implementation, and there are some limitations currently with neovim's syntax api. It's very likely that vim-syntax-compl-pop doesn't work, for example, javascript completion in markdown or html script tag. So I use custom parser in NCM to implement the scoping features.
Note that there's some hacking done in NCM. It uses a per 30ms timer to detect
changes even popup menu is visible, as well as using the TextChangedI
event,
which only triggers when no popup menu is visible. This is important for
implementing the async architecture. I'm hoping one day neovim will offer
better option rather than a timer or the limited TextChangedI
.
YouCompleteMe has good explanation.
Moved to wiki