My experimental vimrc.

vimrc

" Use pathogen to easily modify the runtime path to include all
" " plugins under the ~/.vim/bundle directory
call pathogen#helptags()
call pathogen#runtime_append_all_bundles()

syntax on
filetype plugin indent on
set scrolloff=5 " allways show at least 3 lines
set wildmode=longest,list

set nowrap        " don't wrap lines
set backspace=indent,eol,start " allow backspacing over everything in insert mode
set autoindent    " always set autoindenting on
set copyindent    " copy the previous indentation on autoindenting
set number        " always show line numbers
set shiftround    " use multiple of shiftwidth when indenting with '<' and '>'
set showmatch     " set show matching parenthesis
set ignorecase    " ignore case when searching
set smartcase     " ignore case if search pattern is all lowercase, case-sensitive otherwise
set smarttab      " insert tabs on the start of a line according to shiftwidth, not tabstop
set hlsearch      " highlight search terms
set incsearch     " show search matches as you type
set nobackup
set noswapfile

set expandtab
set tabstop=2     " a tab is four spaces
set shiftwidth=2  " number of spaces to use for autoindenting

colorscheme molokai
autocmd InsertEnter * :set number
autocmd InsertLeave * :set relativenumber
set relativenumber

au VimEnter * RainbowParenthesesToggle
au Syntax * RainbowParenthesesLoadRound
au Syntax * RainbowParenthesesLoadSquare
au Syntax * RainbowParenthesesLoadBraces

set laststatus=2
set statusline+=%F
set colorcolumn=80
let g:Powerline_symbols = 'unicode'
set encoding=utf-8


" key mappings
nmap <S-Right> :tabnext<CR>
nmap <S-Left> :tabprevious<CR>
nmap <S-t> :tabnew<CR>
nmap <S-w> :tabclose<CR>

" repl interaction
nmap , :Eval<CR>
nmap ; :%Eval<CR>

let mapleader = "ß"
nnoremap <Leader>s :%s/\<<C-r><C-w>\>/<C-r><C-w>/g<Left><Left>
vmap <Leader>r y:%s/<C-r><C-O>0/<C-r><C-O>0/gc<Left><Left><Left>