一.版本检测

使用vim --version指令，检 vim版本是否大于7.3.584，一般新系统都满足。打开vim，输入下述指令查看是否支持Python。如果显示为1，则表示支持python；如果显示为0，则表示不支持python，需要重新下载编译vim，使其支持python。

:echo has('python')

二.下载Vundle和YouCompleteMe插件

输入以下指令，下载Vundle

git clone https://github.com/gmarik/Vundle.vim.git ~/.vim/bundle/Vundle.vim

下载成功后，在用户根目录下面，修改.vimrc文件，追加下面语句以便后续安装YouCompleteMe插件

set nocompatible  
filetype off  
set rtp+=~/.vim/bundle/Vundle.vim  
call vundle#begin()  
Plugin 'gmarik/Vundle.vim'  
Plugin 'Valloric/YouCompleteMe'  
call vundle#end()  
filetype plugin indent on  

然后在vim中先按Esc建，并且输入以下指令安装插件：

:PluginInstall 

三.编译YouCompleteMe

在编译之前下载编译工具，准备编译YouCompleteMe

sudo dnf install automake gcc gcc-c++ kernel-devel cmake
sudo dnf install python-devel python3-devel

编译YouCompleteMe使其支持C/C++ 自动补全

cd ~/.vim/bundle/YouCompleteMe
./install.py --clang-completer

四.配置vim

修改.vimrc文件

let g:ycm_global_ycm_extra_conf = '/home/li/.vim/bundle/YouCompleteMe/.ycm_extra_conf.py  
let g:ycm_seed_identifiers_with_syntax=1    " 语法关键字补全  
let g:ycm_confirm_extra_conf=0   " 打开vim时不再询问是否加载ycm_extra_conf.py配置  
inoremap <expr> <CR>  pumvisible() ? "\<C-y>" : "\<CR>"    "回车即选中当前项  
set completeopt=longest,menu    "让Vim的补全菜单行为与一般IDE一致(参考VimTip1228)  

五. 附件

.ycm_extra_conf.py文件内容

import os
import ycm_core
flags = [
'-Wall',
'-Wextra',
'-Wno-long-long',
'-Wno-variadic-macros',
'-fexceptions',
'-stdlib=libc++',
'-std=c++11',
'-x',
'c++',
'-I',
'.',
'-isystem',
'/usr/include',
'-isystem',
'/usr/local/include',
'-isystem',
'/Library/Developer/CommandLineTools/usr/include',
'-isystem',
'/Library/Developer/CommandLineTools/usr/bin/../lib/c++/v1',
]

compilation_database_folder = ''

if os.path.exists( compilation_database_folder ):
  database = ycm_core.CompilationDatabase( compilation_database_folder )
else:
  database = None

SOURCE_EXTENSIONS = [ '.cpp', '.cxx', '.cc', '.c', '.m', '.mm' ]

def DirectoryOfThisScript():
  return os.path.dirname( os.path.abspath( __file__ ) )

def MakeRelativePathsInFlagsAbsolute( flags, working_directory ):
  if not working_directory:
    return list( flags )
  new_flags = []
  make_next_absolute = False
  path_flags = [ '-isystem', '-I', '-iquote', '--sysroot=' ]
  for flag in flags:
    new_flag = flag

    if make_next_absolute:
      make_next_absolute = False
      if not flag.startswith( '/' ):
        new_flag = os.path.join( working_directory, flag )

    for path_flag in path_flags:
      if flag == path_flag:
        make_next_absolute = True
        break

      if flag.startswith( path_flag ):
        path = flag[ len( path_flag ): ]
        new_flag = path_flag + os.path.join( working_directory, path )
        break

    if new_flag:
      new_flags.append( new_flag )
  return new_flags

def IsHeaderFile( filename ):
  extension = os.path.splitext( filename )[ 1 ]
  return extension in [ '.h', '.hxx', '.hpp', '.hh' ]

def GetCompilationInfoForFile( filename ):

  if IsHeaderFile( filename ):
    basename = os.path.splitext( filename )[ 0 ]
    for extension in SOURCE_EXTENSIONS:
      replacement_file = basename + extension
      if os.path.exists( replacement_file ):
        compilation_info = database.GetCompilationInfoForFile(
          replacement_file )
        if compilation_info.compiler_flags_:
          return compilation_info
    return None
  return database.GetCompilationInfoForFile( filename )

def FlagsForFile( filename, **kwargs ):
  if database:


    compilation_info = GetCompilationInfoForFile( filename )
    if not compilation_info:
      return None

    final_flags = MakeRelativePathsInFlagsAbsolute(
      compilation_info.compiler_flags_,
      compilation_info.compiler_working_dir_ )

  else:
    relative_to = DirectoryOfThisScript()
    final_flags = MakeRelativePathsInFlagsAbsolute( flags, relative_to )

  return {
    'flags': final_flags,
    'do_cache': True
  }