CentOS 7 + vim + ycm (clang) + NERDTree

CentOS vim ycm

原本想在CentOS6.6下搞vim的集成开发环境，中间遇到了各种问题，包括gcc版本（因为之前装系统的时候没有划分swap分区，编译高版本gcc时失败），Python版本，后来索性放弃了，转至CentOS 7下做。CentOS 7本身自带的vim是7.4版本的，支持Python，gcc版本是4.8.3，能顺利编译clang。连CentOS6.6和CentOS7搞了一天一夜，纪念一下可算把vim+ycm整出来了，做个记录。下面的内容都是参考别人的成果，具体链接在小标题中都有给出，如有不明白之处，请按图索骥。既然都是别人写的，自己的部分只有几张图片和几个输出信息，那这篇博文自然也是转载的了。

一、安装clang（http://www.noevil.me/archives/900.htm）

1、工具准备

系统首先得有gcc编译器，编译clang需要借助llvm框架，编译条件如下：

2、获取svn源码

安装svn，用于下载clang源码。

yum install svn

3、下载源码

新建目录，进入工作

svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm
cd llvm/tools
svn co http://llvm.org/svn/llvm-project/cfe/trunk clang
cd ../..
cd llvm/tools/clang/tools
svn co http://llvm.org/svn/llvm-project/clang-tools-extra/trunk extra
cd ../../../..
cd llvm/projects
svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt
cd ../..

编译

mkdir build
cd build
../llvm/configure  --enable-optimized --enable-targets=host-only
make
make install

查看编译是否成功

[root@localhost build]#clang --version
clang version 3.7.0 (trunk 242040)
Target: x86_64-unknown-linux-gun
Thread model: posix
[root@localhost build]#clang++ --version
clang version 3.7.0 (trunk 242040)
Target: x86_64-unknown-linux-gun
Thread model: posix

二、vim设置（http://www.cnblogs.com/voidy/p/4637683.html）

1、主题设置

编码工作中偏爱Sublime Text2的背景色，因此找了个和这个差不多的，名为monokai。喜欢的朋友可以到这里下载。下面说说怎么对vim主题进行设置。

• 创建文件夹.vim(如有则跳过)

mkdir ~/.vim

• 在.vim下创建colors目录，将下载的主题文件*.vim放到这个目录下
• 编辑.vimrc文件,在其中加入两行代码：

vim ~/.vimrc

syntax enable
colorscheme monokai

• 效果如下
  

2、安装插件管理器-Vundle

• 下载Vundle

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

• 参考~/.vim/bundle/Vundle.vim/README.md配置vimrc，配置如下：

```vim
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 'gmarik/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/'}
" Avoid a name conflict with L9
Plugin 'user/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

这里简单说明一下如何使用这个插件管理器，首先把想要安装的插件放在这两行代码之间

call vundle#begin()
call vundle#end()

其中第12行是必装的Plugin，这样就可以用Vundle来管理Vundle自己。用法在36至40行有简单的说明。

3、安装插件YCM（http://blog.csdn.net/leaf5022/article/details/21290509#comments）

• 在.vimrc中添加

Plugin 'Valloric/YouCompleteMe'

• 安装插件，打开vim，执行

:PluginInstall

• 创建文件夹放置编译文件

cd ~
mkdir ycm_build
cd ycm_build

• 生成Makefile

cmake -G "Unix Makefiles" -DEXTERNAL_LIBCLANG_PATH=/usr/local/lib/libclang.so ~/.vim/bundle/YouCompleteMe/cpp

• make

make ycm_support_libs

4、YCM配置

vimrc中添加如下内容。

" ycm setting
" 让vim的补全菜单行为与一般IDE一致
set completeopt=longest,menu
"离开插入模式后自动关闭预览窗口
autocmd InsertLeave * if pumvisible() == 0|pclose|endif
"回车即选中当前项
inoremap <expr> <CR>    pumvisible()?"\<C-y>":"<CR>"
"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 = ['<Down>']
let g:ycm_key_list_previous_completion = ['<Up>']
" 
let g:ycm_global_ycm_extra_conf='~/.ycm_extra_conf.py'
" 开启 YCM 基于标签引擎
let g:ycm_collect_identifiers_from_tag_files = 1
" 从第2个键入字符就开始罗列匹配项
let g:ycm_min_num_of_chars_for_completion=2
" 禁止缓存匹配项,每次都重新生成匹配项
let g:ycm_cache_omnifunc=0
" 语法关键字补全
let g:ycm_seed_identifiers_with_syntax = 1
let g:ycm_confirm_extra_conf=0
let g:ycm_key_invoke_completion = '<C-/>'
" 在接受补全后不分裂出一个窗口显示接受的项
set completeopt-=preview
"force recomile with syntastic
nnoremap <F5> :YcmForceCompileAndDiagnostics<CR>
" 
"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
"
"设置error和warning的提示符，如果没有设置，ycm会以syntastic的g:syntastic_warning_symbol
"和 g:syntastic_error_symbol 这两个为准
let g:ycm_error_symbol='>>'
let g:ycm_warning_symbol='>*'
"设置跳转的快捷键，可以跳转到definition和declaration
nnoremap <leader>gc :YcmCompleter GoToDeclaration<CR>
nnoremap <leader>gf :YcmCompleter GoToDefinition<CR>
nnoremap <leader>gg :YcmCompleter GoToDefinitionElseDeclaration<CR>

5、安装NERDTree

• 在.vimrc中添加

Plugin 'scrooloose/nerdtree'

• 安装插件，打开vim，执行

:PluginInstall

6、配置NERDTree

vimrc中添加如下内容。

" nerdtree设置
map <F2> :NERDTreeToggle<CR>
let NERDTreeIgnore=['\.o$', '\.ko$', '\.so$', '\.a$', '\.swp$', '\.bak$', '\~$']
let NERDTreeSortOrder=['\/$', 'Makefile', '\.c$', '\.cc$', '\.cpp$', '\.h$', '*', '\~$']
let NERDTreeMinimalUI=1
let NERDTreeQuitOnOpen=1