---

Ⅰ. 插件描述

A completion plugin for Haskell, using ghc-mod

Ⅱ. 基本信息

创建日期：  2010-09-24 使用用户：  1010 Github星：  358 插件作者：  ujihisa .

Ⅲ. 安装方法

使用Vundle管理器安装

在你的.vimrc下添加:

Plugin 'eagletmt/neco-ghc'

… 然后在Vim中运行以下命令:

:source %
:PluginInstall

对于Vundle版本 < 0.10.2，请用上面的Bundle替换Plugin。

使用NeoBundle管理器安装

在你的.vimrc下添加:

NeoBundle 'eagletmt/neco-ghc'

… 然后在Vim中运行以下命令:

:source %
:NeoBundleInstall

使用VimPlug管理器安装

在你的.vimrc下添加:

Plug 'eagletmt/neco-ghc'

… 然后在Vim中运行以下命令:

:source %
:PlugInstall

使用Pathogen管理器安装

在终端中运行以下命令:

cd ~/.vim/bundle
git clone https://github.com/eagletmt/neco-ghc

Ⅳ. 文档说明

# neco-ghc: ghc-mod completion for neocomplcache/neocomplete/deoplete

A completion plugin for Haskell, using ghc-mod

What is neco-ghc

This plugin supports the following completion.

• pragma

  ![](http://cache.gyazo.com/c922e323be7dbed9aa70b2bac62be45e.png)

• language

  ![](http://cache.gyazo.com/9df4aa3cf06fc07495d6dd67a4d07cc4.png)

• importing a module

  ![](http://cache.gyazo.com/17a8bf08f3a6d5e123346f5f1c74c5f9.png)

• importing a function of a module

  ![](http://cache.gyazo.com/d3698892a40ffb8e4bef970a02198715.png)

• function based on importing modules

  ![](http://cache.gyazo.com/bc168a8aad5f38c6a83b8aa1b0fb14f6.png)
  

neco-ghc was originally implemented by @eagletmt on July 25, 2010, and then
ujihisa added some new features.

Install

• Install ghc-mod package by stack install ghc-mod or cabal install ghc-mod
• Unarchive neco-ghc and put it into a dir of your &rtp.

Note: If you use ghc-mod 5.4, you should use ghc-mod 5.5+.
Because, ghc-mod 5.5 fixes the rootdir problem.

https://github.com/DanielG/ghc-mod/issues/665

Usage

neco-ghc provides necoghc#omnifunc for omni-completion.
I recommend adding the following in your ~/.vim/ftplugin/haskell.vim.

" Disable haskell-vim omnifunc
let g:haskellmode_completion_ghc = 0
autocmd FileType haskell setlocal omnifunc=necoghc#omnifunc

See :help compl-omni for details on omni-completion.

Completion engines

This plugin can be used as a source of
neocomplete.vim or
neocomplcache.vim or
deoplete.nvim.
You can enjoy auto-completions without any specific configuration.

This plugin also should work with YouCompleteMe.
To enable auto-completions, you have to add the following setting.

let g:ycm_semantic_triggers = {'haskell' : ['.']}

Options

g:necoghc_enable_detailed_browse

Default: 0

Show detailed information (type) of symbols.
You can enable it by adding let g:necoghc_enable_detailed_browse = 1 in your vimrc.
While it is quite useful, it will take longer boot time.

This feature was introduced in ghc-mod 1.11.5.

g:necoghc_debug

Default: 0

Show error message if ghc-mod command fails.
Usually it will be noisy if ghc-mod browse Your.Project.Module always
fails.
Use this flag only if you have some trouble.

g:necoghc_use_stack

Default: 0

Allow using stack's own ghc-mod.
It will change direct ghc-mod mod calls to `stack exec --no-stack-exe ghc-mod
--` instead.
Use this flag if your globally installed ghc-mod doesn't work properly with your
stack projects.

Troubleshoot

Q: neco-ghc does not work

Check the $PATH variable in vim contains the path to your ghc-mod command.
Or you can execute :NecoGhcDiagnostics command for debug.

Q: Completion isn't working for local functions or modules

https://github.com/eagletmt/neco-ghc/issues/44

It's a limitation of ghc-mod.
ghc-mod can show symbols of installed modules only.
ghc-mod cannot show symbols of developing modules or current source file.

License

BSD3 License, the same license as ghc-mod.