自动补全插件ＹＣＭ配置

测试环境ubuntu 14.04。
1、检测安装环境是否支持；
检测vim版本是否在7.3.598及以上，是否安装有python2或python3;如果版本低请自行安装；
2、安装开发工具和cmake；sudo apt-get install build-essential cmake
安装python头文件；sudo apt-get install python-dev python3-dev.
3、安装vim插件管理工具vundle；
3.1克隆源码到本地；
家目录下执行：
git clone https://github.com/VundleVim/Vundle.vim.git ~/.vim/bundle/Vundle.vim
3.2在vimrc加入vundle配置代码；

set nocompatible              " be iMproved, required
filetype off                  " required

" set the runtime path to include Vundle and initialize
set rtp+=~/.vim/bundle/Vundle.vim
call vundle#begin()
" alternatively, pass a path where Vundle should install plugins
"call vundle#begin('~/some/path/here')

" let Vundle manage Vundle, required
Plugin 'VundleVim/Vundle.vim'

" The following are examples of different formats supported.
" Keep Plugin commands between vundle#begin/end.
" plugin on GitHub repo
Plugin 'tpope/vim-fugitive'
" plugin from http://vim-scripts.org/vim/scripts.html
Plugin 'L9'
" Git plugin not hosted on GitHub
Plugin 'git://git.wincent.com/command-t.git'
" git repos on your local machine (i.e. when working on your own plugin)
Plugin 'file:///home/gmarik/path/to/plugin'
" The sparkup vim script is in a subdirectory of this repo called vim.
" Pass the path to set the runtimepath properly.
Plugin 'rstacruz/sparkup', {
    'rtp': 'vim/'}
" Install L9 and avoid a Naming conflict if you've already installed a
" different version somewhere else.
Plugin 'ascenator/L9', {
    'name': 'newL9'}

" All of your Plugins must be added before the following line
call vundle#end()            " required
filetype plugin indent on    " required
" To ignore plugin indent changes, instead use:
"filetype plugin on
"
" Brief help
" :PluginList       - lists configured plugins
" :PluginInstall    - installs plugins; append `!` to update or just :PluginUpdate
" :PluginSearch foo - searches for foo; append `!` to refresh local cache
" :PluginClean      - confirms removal of unused plugins; append `!` to auto-approve removal
"
" see :h vundle for more details or wiki for FAQ
" Put your non-Plugin stuff after this line

*注意set rtp+=后面的路径是不是你git clone vundle的路径；
3.3 在终端执行vim +PluginInstall +qall命令安装vundle；此过程需要等待较长时间；
4、编译YCM；
cd ~/.vim/bundle/YouCompleteMe
./install.py –clang-completer //此过程需要等待较长时间
如果执行命令出现如下错误，请执行apt-get install clang

Searching Python 2.7 libraries...
ERROR: unable to find an appropriate Python library.
Traceback (most recent call last):
  File "./install.py", line 32, in 
    Main()
  File "./install.py", line 21, in Main
    subprocess.check_call( [ python_binary, build_file ] + sys.argv[1:] )
  File "/usr/lib/python2.7/subprocess.py", line 540, in check_call
    raise CalledProcessError(retcode, cmd)

5、语意补全要正确工作，需要配置好.ycm_extra_conf.py文件，模板可以自行百度选择。可以把这个文件放在项目的根目录下，打开项目文件时，YCM会循环向上搜索并加载这个文件，或者在vimrc文件中加入
let g:ycm_global_ycm_extra_conf = ‘your path to .ycm_extra_conf.py’

6、修改vimrc中的自动不全配置；

在.vimrc中添加配置：
" 自动补全配置
set completeopt=longest,menu    "让Vim的补全菜单行为与一般IDE一致(参考VimTip1228)
autocmd InsertLeave * if pumvisible() == 0|pclose|endif "离开插入模式后自动关闭预览窗口
inoremap <expr> <CR>       pumvisible() ? "\<C-y>" : "\<CR>"    "回车即选中当前项
"上下左右键的行为 会显示其他信息
inoremap <expr> <Down>     pumvisible() ? "\<C-n>" : "\<Down>"
inoremap <expr> <Up>       pumvisible() ? "\<C-p>" : "\<Up>"
inoremap <expr> <PageDown> pumvisible() ? "\<PageDown>\<C-p>\<C-n>" : "\<PageDown>"
inoremap <expr> <PageUp>   pumvisible() ? "\<PageUp>\<C-p>\<C-n>" : "\<PageUp>"

"youcompleteme  默认tab  s-tab 和自动补全冲突
"let g:ycm_key_list_select_completion=['<c-n>']
let g:ycm_key_list_select_completion = ['<Down>']
"let g:ycm_key_list_previous_completion=['<c-p>']
let g:ycm_key_list_previous_completion = ['<Up>']
let g:ycm_confirm_extra_conf=0 "关闭加载.ycm_extra_conf.py提示

let g:ycm_collect_identifiers_from_tags_files=1 " 开启 YCM 基于标签引擎
let g:ycm_min_num_of_chars_for_completion=2 " 从第2个键入字符就开始罗列匹配项
let g:ycm_cache_omnifunc=0  " 禁止缓存匹配项,每次都重新生成匹配项
let g:ycm_seed_identifiers_with_syntax=1    " 语法关键字补全
nnoremap <F5> :YcmForceCompileAndDiagnostics<CR>    "force recomile with syntastic
"nnoremap <leader>lo :lopen<CR> "open locationlist
"nnoremap <leader>lc :lclose<CR>    "close locationlist
inoremap <leader><leader> <C-x><C-o>
"在注释输入中也能补全
let g:ycm_complete_in_comments = 1
"在字符串输入中也能补全
let g:ycm_complete_in_strings = 1
"注释和字符串中的文字也会被收入补全
let g:ycm_collect_identifiers_from_comments_and_strings = 0

nnoremap <leader>jd :YcmCompleter GoToDefinitionElseDeclaration<CR> " 

未完待续，目前已可以实现自动不全，但是需要ctrl + n 操作才可以实现，正在寻找解决方案。