升级vim8
使用了 fedora 一个非官方源便捷升级。
# curl -L https://copr.fedorainfracloud.org/coprs/lantw44/vim-latest/repo/epel-7/lantw44-vim-latest-epel-7.repo -o /etc/yum.repos.d/lantw44-vim-latest-epel-7.repo
# yum update "vim*"
验证
# vim --version
VIM - Vi IMproved 8.1 (2018 May 17, compiled Jun 19 2018 22:44:37)
Included patches: 1-89
配置vim
1. 插件管理 vim-plug
curl -fLo ~/.vim/autoload/plug.vim --create-dirs \
https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim
这样就可以在 .vimrc 中便捷添加插件了。示例：
" Specify a directory for plugins
" - Avoid using standard Vim directory names like 'plugin'
call plug#begin('~/.vim/plugged')
Plug 'tpope/vim-sensible'
Plug 'vim-airline/vim-airline'
Plug 'vim-airline/vim-airline-themes'
let g:airline_theme='light'
" Initialize plugin system
call plug#end()
定义好后使用 :PlugInstall 命令开始安装指定的插件，每次需要更新 vim-plug 时只需要 :PlugUpgrade。
vim-plug也支持延迟按需加载，等到使用到命令的时候再加载或者打开对应文件类型才加载。详情参见文档。
2. 符号索引 Universal CTags
使用符号索引插件 ctags 以及 tags 异步生成工具 vim-gutentags:
Plug 'universal-ctags/ctags'
Plug 'ludovicchabant/vim-gutentags'
" gutentags 搜索工程目录的标志，碰到这些文件/目录名就停止向上一级目录递归
let g:gutentags_project_root = ['.root', '.svn', '.git', '.hg', '.project']
" 所生成的数据文件的名称
let g:gutentags_ctags_tagfile = '.tags'
" 将自动生成的 tags 文件全部放入 ~/.cache/tags 目录中，避免污染工程目录
let s:vim_tags = expand('~/.cache/tags')
let g:gutentags_cache_dir = s:vim_tags
" 配置 ctags 的参数
let g:gutentags_ctags_extra_args = ['--fields=+niazS', '--extra=+q']
let g:gutentags_ctags_extra_args += ['--c++-kinds=+px']
let g:gutentags_ctags_extra_args += ['--c-kinds=+px']
" 检测 ~/.cache/tags 不存在就新建
if !isdirectory(s:vim_tags)
silent! call mkdir(s:vim_tags, 'p')
endif
如果一个文件没有托管在 .git/.svn 中，gutentags 找不到工程目录的话，就不会为该野文件生成 tags，这也很合理。想要避免的话，你可以在你的野文件目录中放一个名字为 .root 的空白文件，主动告诉 gutentags 这里就是工程目录。
3. 编译运行 AsyncRun
Plug 'skywind3000/asyncrun.vim'
" asyncrun 搜索工程目录的标志，碰到这些文件/目录名就停止向上一级目录递归。
" 如果递归到根目录还没找到，那么文件所在目录就被当作项目目录。
let g:asyncrun_rootmarks = ['.svn', '.git', '.root', '_darcs', 'build.xml']
" 自动打开 quickfix window ，高度为 6
let g:asyncrun_open = 6
" 任务结束时候响铃提醒
let g:asyncrun_bell = 1
" 设置 F10 打开/关闭 Quickfix 窗口
nnoremap <F10> :call asyncrun#quickfix_toggle(6)<cr>
" 设置 F7 从工程根目录编译整个工程
nnoremap <silent> <F7> :AsyncRun -cwd=<root> make <cr>
4. 代码检查 ALE
ALE（Asynchronous Lint Engine）支持多种语言的各种代码分析器，如 gcc、cppcheck 等，但需要另行安装并放入 PATH。ALE 能在你修改了文本后自动调用这些 linter 来分析最新代码，然后将各种 linter 的结果进行汇总并显示再界面上。
Plug 'w0rp/ale'
let g:ale_linters_explicit = 1
let g:ale_linters = {
\ 'csh': ['shell'],
\ 'zsh': ['shell'],
\ 'go': ['gofmt', 'golint'],
\ 'python': ['flake8', 'mypy', 'pylint'],
\ 'c': ['gcc', 'cppcheck'],
\ 'cpp': ['gcc', 'cppcheck'],
\ 'text': [],
\}
let g:ale_completion_delay = 500
let g:ale_echo_delay = 20
let g:ale_lint_delay = 500
let g:ale_echo_msg_format = '[%linter%] %code: %%s'
let g:ale_lint_on_text_changed = 'normal'
let g:ale_lint_on_insert_leave = 1
let g:airline#extensions#ale#enabled = 1
let g:ale_c_gcc_options = '-Wall -O2 -std=c99'
let g:ale_cpp_gcc_options = '-Wall -O2 -std=c++11'
let g:ale_c_cppcheck_options = ''
let g:ale_cpp_cppcheck_options = ''
5. 修改比较vim-signify
Plug 'mhinz/vim-signify'
let g:signify_vcs_list = [ 'git' ]
let g:signify_sign_show_text = 1
6. 语法高亮 vim-cpp-enhanced-highlight
Plug 'octol/vim-cpp-enhanced-highlight'
let c_no_curly_error = 1
7. 编辑辅助 vim-unimpaired
Plug 'tpope/vim-unimpaired'
unimpaired 插件定义了一系列括号开头的快捷键，被称为官方 Vim 中丢失的快捷键。详见插件文档。
8. 代码补全 YouCompleteMe
Plug 'Valloric/YouCompleteMe', { 'do': './install.py --clang-completer --go-completer' }
let g:ycm_global_ycm_extra_conf='~/.vim/plugged/YouCompleteMe/third_party/ycmd/examples/.ycm_extra_conf.py'
let g:ycm_add_preview_to_completeopt = 0
let g:ycm_show_diagnostics_ui = 0
let g:ycm_server_log_level = 'info'
let g:ycm_min_num_identifier_candidate_chars = 2
let g:ycm_collect_identifiers_from_comments_and_strings = 1
let g:ycm_complete_in_strings=1
let g:ycm_key_invoke_completion = '<c-z>' " 使用 Ctrl+Z 主动触发语义补全
noremap <c-z> <NOP>
set completeopt=menu,menuone
" 修改补全列表配色
highlight PMenu ctermfg=0 ctermbg=242 guifg=black guibg=darkgrey
highlight PMenuSel ctermfg=242 ctermbg=8 guifg=darkgrey guibg=black
" 对指定源文件，输入两个字母后即触发语义补全
let g:ycm_semantic_triggers = {
\ 'c,cpp,python,java,go,erlang,perl': ['re!\w{2}'],
\ 'cs,lua,javascript': ['re!\w{2}'],
\ }
let g:ycm_filetype_whitelist = {
\ "c":1,
\ "cpp":1,
\ "go":1,
\ "python":1,
\ "sh":1,
\ "zsh":1,
\ }
let g:ycm_filetype_blacklist = {
\ 'markdown' : 1,
\ 'text' : 1,
\ 'pandoc' : 1,
\ 'infolog' : 1,
\}
9. 参数提示 echodoc
写 C/C++ 时函数忘了可以用上面的 YCM 补全，若是参数忘记了则可以使用 echodoc 插件。当用 YCM 的 tab 补全了一个函数名后，只要输入左括号，下面命令行就会显示出该函数的参数信息，并且随着光标移动高亮出当前参数位置。
Plug 'Shougo/echodoc.vim'
set noshowmode
10. 函数列表 LeaderF
这里定义了 CTRL+P 在当前项目目录打开文件搜索，CTRL+N 打开 MRU 搜索，ALT+P 打开函数搜索，ALT+N 打开 Buffer 搜索，ALT+M 打开 Tag 搜索：
Plug 'Yggdroot/LeaderF', { 'do': './install.sh' }
let g:Lf_ShortcutF = '<c-p>'
let g:Lf_ShortcutB = '<m-n>'
noremap <c-n> :LeaderfMru<cr>
noremap <m-p> :LeaderfFunction!<cr>
noremap <m-n> :LeaderfBuffer<cr>
noremap <m-m> :LeaderfTag<cr>
let g:Lf_StlSeparator = { 'left': '', 'right': '', 'font': '' }
let g:Lf_RootMarkers = ['.project', '.root', '.svn', '.git']
let g:Lf_WorkingDirectoryMode = 'Ac'
let g:Lf_WindowHeight = 0.30
let g:Lf_CacheDirectory = expand('~/.vim/cache')
let g:Lf_ShowRelativePath = 0
let g:Lf_HideHelp = 1
let g:Lf_StlColorscheme = 'powerline'
let g:Lf_PreviewResult = {'Function':0, 'BufTag':0}
11. 文件浏览 vim-dirvish
头文件和源文件之间可以使用 :A 命令快速切换，其它可以折腾下 dirvish。
Plug 'vim-scripts/a.vim'
Plug 'justinmk/vim-dirvish'
12. 其它
set autoindent " Indent according to previous line.
set expandtab " Use spaces instead of tabs.
set softtabstop =4 " Tab key indents by 4 spaces.
set shiftwidth =4 " >> indents by 4 spaces.
set shiftround " >> indents to next multiple of 'shiftwidth'.
set hidden " Switch between buffers without having to save first.
set display =lastline " Show as much as possible of the last line.
set ttyfast " Faster redrawing.
set lazyredraw " Only redraw when necessary.
set splitbelow " Open new windows below the current window.
set splitright " Open new windows right of the current window.
set cursorline " Find the current line quickly.
set wrapscan " Searches wrap around end-of-file.
set report =0 " Always report changed lines.
set synmaxcol =120 " Only highlight the first 200 columns.
set list " Show non-printable characters.
if has('multi_byte') && &encoding ==# 'utf-8'
let &listchars = 'tab:▸ ,extends:❯,precedes:❮,nbsp:±'
else
let &listchars = 'tab:> ,extends:>,precedes:<,nbsp:.'
endif
" Put all temporary files under the same directory.
let s:vim_backup = expand("$HOME/.vim/files/backup/")
if !isdirectory(s:vim_backup)
silent! call mkdir(s:vim_backup, 'p')
endif
let s:vim_swap = expand("$HOME/.vim/files/swap/")
if !isdirectory(s:vim_swap)
silent! call mkdir(s:vim_swap, 'p')
endif
let s:vim_undo = expand("$HOME/.vim/files/undo/")
if !isdirectory(s:vim_undo)
silent! call mkdir(s:vim_undo, 'p')
endif
let s:vim_info = expand("$HOME/.vim/files/info/")
if !isdirectory(s:vim_info)
silent! call mkdir(s:vim_info, 'p')
endif
set backup
set backupdir =$HOME/.vim/files/backup/
set backupext =-vimbackup
set backupskip =
set directory =$HOME/.vim/files/swap/
set updatecount =100
set undofile
set undodir =$HOME/.vim/files/undo/
set viminfo ='100,n$HOME/.vim/files/info/viminfo