" ====================================================================
" Vim 配置 - 合并优化版
" ====================================================================

set nocompatible
let skip_defaults_vim = 1
filetype plugin indent on
syntax enable

" --------------------------------------------------------------------
" 编码（中文环境必备）
" --------------------------------------------------------------------
set encoding=utf-8
set fileencodings=ucs-bom,utf-8,gbk,gb18030,big5,latin1

" --------------------------------------------------------------------
" 界面显示
" --------------------------------------------------------------------
set laststatus=2                " 状态栏始终显示
set cursorline                  " 高亮当前行
set scrolloff=5                 " 滚动时光标距边缘保留 5 行
set showcmd                     " 右下角显示输入中的命令
set showmatch                   " 输入括号时跳到匹配的括号闪一下
set matchtime=1                 " 括号匹配闪烁时间 0.1 秒
set wrap                        " 长行自动折行显示
set wildmenu                    " 命令行补全显示候选菜单
set wildmode=list:longest,full  " 补全先列出所有候选，再依次循环
set splitright                  " 垂直分割时新窗口在右边
set splitbelow                  " 水平分割时新窗口在下边
set statusline=%f\ %m%r%h%w\ %y\ %=%-14.(%l,%c%V%)\ %P


" --------------------------------------------------------------------
" 编辑行为
" --------------------------------------------------------------------
set backspace=indent,eol,start  " 退格键不受限
set expandtab                   " Tab 键插入空格
set tabstop=4                   " Tab 显示宽度 4 格
set shiftwidth=4                " 自动缩进每级 4 格
set softtabstop=-1              " 退格按缩进层级删，跟着 shiftwidth 走
set autoindent                  " 新行继承上一行缩进
set smartindent                 " { 之后自动多缩进一级

" --------------------------------------------------------------------
" 搜索
" --------------------------------------------------------------------
set hlsearch                    " 搜索结果高亮
set incsearch                   " 边输入边跳转
set ignorecase                  " 搜索忽略大小写
set smartcase                   " 搜索词含大写时自动区分大小写

" --------------------------------------------------------------------
" 系统集成
" --------------------------------------------------------------------
set clipboard=unnamedplus       " 与系统剪贴板互通
set mouse=                      " 禁用鼠标，方便终端直接框选复制
set backupcopy=yes              " 原地修改文件，防止热更新 inode 问题

" --------------------------------------------------------------------
" 持久撤销
" --------------------------------------------------------------------
set undofile                    " 关闭文件后再打开仍可撤销
set undodir=~/.vim/undo         " 撤销历史存放目录
if !isdirectory(expand("~/.vim/undo"))
  silent !mkdir -p ~/.vim/undo
endif

" --------------------------------------------------------------------
" 性能
" --------------------------------------------------------------------
set updatetime=300              " 后台任务触发间隔，影响插件响应速度

" --------------------------------------------------------------------
" 格式化
" --------------------------------------------------------------------
" 阻止注释行回车后自动续加注释符号
autocmd FileType * setlocal formatoptions-=o formatoptions-=r
" diff 时忽略空格差异
set diffopt+=iwhite
" 打开文件自动跳到上次关闭时的位置
autocmd BufReadPost * if line("'\"") > 1 && line("'\"") <= line("$") | exe "normal! g'\"" | endif

" --------------------------------------------------------------------
" 快捷键
" --------------------------------------------------------------------
let mapleader = ","
nnoremap <Leader>x :confirm x<CR>  " ,x 保存并退出（有提示）
nnoremap <Leader>q :confirm q<CR>  " ,q 退出（有提示）
nnoremap <F2> :set number!<CR>
nnoremap <silent> <Leader>/ :nohlsearch<CR>         " ,/ 取消搜索高亮