vimrc.mappings

" strip trailing whitespace and global reformat
nnoremap _$ :call Preserve("%s/\\s\\+$//e")<CR>
nnoremap _= :call Preserve("normal gg=G")<CR>
" make & trigger :&& so it preserves flags
nnoremap & :&&<Enter>
xnoremap & :&&<Enter>
" horizontal split resizing
nnoremap + 5<C-w>+
nnoremap - 5<C-w>-
" vertical split resizing
nnoremap > 4<C-w>>
nnoremap < 4<C-w><
" escape from insert/visual mode
inoremap jk <ESC>
inoremap jkl <ESC>A
cnoremap jk <ESC>
" splits
nnoremap <silent> ss <C-w>s
nnoremap <silent> vv <C-w>v
" sudo write current buffer
cmap W :w !sudo tee %
" make Y consistend with C and D
nnoremap Y y$
" paste system clipboard
inoremap zp <C-r>*
inoremap zP <C-r>+
nnoremap <F5> :GundoToggle<CR>
nnoremap <Tab> %
" indentation
vnoremap <Tab> >gv
vnoremap <S-Tab> <gv
" tab navigation
nnoremap <Left>  :tabprevious<CR>
nnoremap <Right> :tabnext<CR>
inoremap <Left>  <Esc>:tabprevious<CR>
inoremap <Right> <Esc>:tabnext<CR>
nnoremap <Up>    :execute 'silent! tabmove ' . (tabpagenr()-2)<CR>
nnoremap <Down>  :execute 'silent! tabmove ' . tabpagenr()<CR>
" scroll the viewport faster
nnoremap <C-e> 3<C-e>
nnoremap <C-y> 3<C-y>
" navigate splits with Ctrl + j/k/h/l
nnoremap <C-j> <C-w>j
nnoremap <C-k> <C-w>k
nnoremap <C-h> <C-w>h
nnoremap <C-l> <C-w>l
" toggles
nnoremap \a :Ack 
nnoremap \h :set hlsearch!<CR>
nnoremap \i :set incsearch!<CR>
nnoremap \n :NERDTreeToggle<CR>
nnoremap \nf :NERDTreeFind<CR>
nnoremap \t :TagbarToggle<CR>
nnoremap \b :CtrlPBuffer<CR>
" tabular aligning
nnoremap <Leader>a V}:Tab /
vnoremap <Leader>a :Tab /
" vundle
nmap <Leader>bi  :BundleInstall<CR>
nmap <Leader>bu  :BundleInstall!<CR>
nmap <Leader>bc  :BundleClean<CR>
" colors
nnoremap <Leader>csm :colorscheme molokai<CR>
nnoremap <Leader>css :colorscheme solarized<CR>
nnoremap <Leader>csv :colorscheme vividchalk<CR>
nnoremap <Leader>cst :colorscheme Tomorrow-Night<CR>
" explorer
nnoremap <Leader>e :e.<CR>
" fold current indent
nnoremap <Leader>fi V}kzf 
" search
nnoremap <Leader>q :q<CR>
" rails.vim
nnoremap <Leader>rt :RT 
nnoremap <Leader>rs :RS 
nnoremap <Leader>rv :RV 
nnoremap <Leader>s :%s/
vnoremap <Leader>s :s/
nnoremap <Leader>sn :set invnumber<CR>
nnoremap <Leader>sp :set invpaste paste?<CR>
nnoremap <Leader>t  :tabnew<CR>:e.<CR>
nnoremap <Leader>tn :tabnew<CR>
nnoremap <Leader>tb <C-o>:tab ball<CR>
nnoremap <Leader>v :source ~/.vimrc<CR>
nnoremap <Leader>w :w<CR>
inoremap <Leader>w <C-o>:w<CR><Esc>
nnoremap <Leader>ws :mksession .vim-session
nnoremap <Leader>x :x<CR>
" maximize window
nnoremap <Leader>wm <C-w>_

" util function to preserve history/line/col when executing a command
function! Preserve(command)
  " save last search and curso"
  let _s=@/
  let l = line(".")
  let c = col(".")
  execute a:command
  let @/=_s
  call cursor(l, c)
endfunction

" switch between tabbing styles
function! Four_tab()
  :set expandtab tabstop=4 shiftwidth=4 softtabstop=4
endfunction
function! Two_tab()
  :set expandtab tabstop=2 shiftwidth=2 softtabstop=2
endfunction

" automatically load session file in cwd if it exists
" hrm does this fire on new tabs ?
function! RestoreSession()
  if argc() == 0 "vim called without arguments
    if filereadable('.vim-session')
      execute 'source .vim-session'
    end
  end
endfunction
autocmd VimEnter * call RestoreSession()