A minimal vim configuration file

.vimrc

" A minimal .vimrc with no plugin manager required
" About: This file is a combination of Integralist/.vimrc on github and a bunch of
"        scripts I found useful.
" Author: Chong-Chong He
" Email: che1234@umd.edu

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" The following script is downloaded from
" Integralist/.vimrc: https://gist.github.com/Integralist/b435e36cfb3fdea1579b8f342b72974e
" Now the link failed and here is Integralist's new .vimrc:
" https://github.com/Integralist/dotfiles/blob/master/.vimrc
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" Use the system clipboard
set clipboard+=unnamed

" Switch syntax highlighting on
syntax on

" Don't worry about trying to support old school Vi features
set nocompatible

" No backup files
"set nobackup

" No write backup
set nowritebackup

" No swap file
"set noswapfile

" Command history
set history=100

" Always show cursor
set ruler

" Show incomplete commands
set showcmd

" Incremental searching (search as you type)
set incsearch

" Highlight search matches
set hlsearch

" Ignore case in search
set smartcase

" Make sure any searches /searchPhrase doesn't need the \c escape character
set ignorecase

" A buffer is marked as ‘hidden’ if it has unsaved changes, and it is not currently loaded in a window
" If you try and quit Vim while there are hidden buffers, you will raise an error:
" E162: No write since last change for buffer “a.txt”
set hidden

" Turn word wrap off
set nowrap

" Allow backspace to delete end of line, indent and start of line characters
set backspace=indent,eol,start

" Convert tabs to spaces
set expandtab

" Set tab size in spaces (this is for manual indenting)
set tabstop=2

" The number of spaces inserted for a tab (used for auto indenting)
set shiftwidth=2

" Turn on line numbers
set number

" Highlight tailing whitespace
"set list listchars=tab:\ \ ,trail:·

" Get rid of the delay when pressing O (for example)
" http://stackoverflow.com/questions/2158516/vim-delay-before-o-opens-a-new-line
set timeout timeoutlen=1000 ttimeoutlen=100

" Always show status bar
set laststatus=2

" Set the status line to something useful
set statusline=%f\ %m\ %=L:%l/%L\ C:%c\ (%p%%)

" UTF encoding
set encoding=utf-8

" Autoload files that have changed outside of vim
set autoread

" Better splits (new windows appear below and to the right)
set splitbelow
set splitright

" Highlight the current line
set cursorline

" Ensure Vim doesn't beep at you every time you make a mistype
"set visualbell

" Visual autocomplete for command menu (e.g. :e ~/path/to/file)
set wildmenu

" Redraw only when we need to (i.e. don't redraw when executing a macro)
set lazyredraw

" Highlight a matching [{()}] when cursor is placed on start/end character
set showmatch

" <C-x><C-k> for word autocomplete
set dictionary=/usr/share/dict/words

" Use Ag for :grep command (would use Sift but it doesn't work well)
set grepprg=ag\ --nogroup\ --nocolor

" vim-go
let g:go_fmt_command = "goimports"
let g:go_metalinter_autosave = 1
let g:go_metalinter_autosave_enabled = ['vet', 'golint']
let g:go_metalinter_enabled = ['vet', 'golint', 'errcheck']

fun! StripTrailingWhitespace()
  " Don't strip on these filetypes
  if &ft =~ 'markdown'
    return
  endif
  %s/\s\+$//e
endfun
autocmd BufWritePre * call StripTrailingWhitespace()

autocmd Filetype gitcommit setlocal spell textwidth=72
autocmd Filetype markdown setlocal wrap linebreak nolist textwidth=0 wrapmargin=0 " http://vim.wikia.com/wiki/Word_wrap_without_line_breaks
autocmd FileType sh,cucumber,ruby,yaml,zsh,vim setlocal shiftwidth=2 tabstop=2 expandtab

" Specify syntax highlighting for specific files
autocmd Bufread,BufNewFile *.spv set filetype=php
autocmd Bufread,BufNewFile *.md set filetype=markdown " Vim interprets .md as 'modula2' otherwise, see :set filetype?

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" End of Integralist/.vimrc
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"" different syntax highlight color scheme for vimdiff mode
highlight! link DiffText Todo
"" The following is not working
if &diff
  syntax off
endif

""split navigations
nnoremap <C-J> <C-W><C-J>
nnoremap <C-K> <C-W><C-K>
nnoremap <C-L> <C-W><C-L>
nnoremap <C-H> <C-W><C-H>
"nmap <C-h> <C-w>h
"nmap <C-j> <C-w>j
"nmap <C-k> <C-w>k
"nmap <C-l> <C-w>l

" spell checking
autocmd BufRead,BufNewFile *.md setlocal spell spelllang=en_us
autocmd BufRead,BufNewFile *.tex setlocal spell spelllang=en_us

let $max_print_line=1024

"" Python PEP8 indentation
au BufNewFile,BufRead *.py
    \ set tabstop=4 |
    \ set softtabstop=4 |
    \ set shiftwidth=4 |
    \ set textwidth=79 |
    \ set expandtab |
    \ set autoindent |
    \ set fileformat=unix

au BufNewFile,BufRead *.js, *.html, *.css
    \ set tabstop=2 |
    \ set softtabstop=2 |
    \ set shiftwidth=2

" Flagging Unnecessary Whitespace
"au BufRead,BufNewFile *.py,*.pyw,*.c,*.h match BadWhitespace /\s\+$/

" OPTIONAL: This enables automatic indentation as you type.
filetype indent on

" ignores the case. set noic to disable
set ic

" Allow copy to system clipboard
" Ref: https://vi.stackexchange.com/questions/84/how-can-i-copy-text-to-the-system-clipboard-from-vim
noremap ,y "*y
noremap ,p "*p
noremap ,Y "+y
noremap ,P "+p