vim indentation

Some useful lines for configuring the indentation behavior of vim.
These commands can be executed inside vim, all preceded by a colon (:), or added to ~/.vimrc.

This changes the display width of the tab (to save precious screen space):

  set shiftwidth=3
  set tabstop=3

and adding this, replaces the tabs with spaces

  expandtab
  set softtabstop=3

To indent (or re-indent) a block of code, first select some lines with Shift-V, and then press =

Sources:
http://vim.wikia.com/wiki/Indenting_source_code
http://tedlogan.com/techblog3.html

Code folding with Vim

I've learned about code folding using Vim.

The command zfa} collapses (folds) a C block using the } symbol as guide.

The following code maps the Spacebar to a function that folds/unfolds the current block (add this to ~/.vimrc), based on this.

"Fold coloring 

hi Folded        ctermfg=white ctermbg=NONE

fun! ToggleFold()

if foldclosed('.') < 0

". foldclose

:execute "normal zfa}<cr>"

else

. foldopen

endif

" Clear status line

echo 

endfun

" Map fold/unfold function to Space key.

"nmap <space> zfa}<cr>

"nmap <space> :call ToggleFold()<cr>

noremap <space> :call ToggleFold()<cr>

Here there is a more sophisticated function for folding.

vmap <space> zf

" inspired by Max Ischenko's http://www.vim.org/tips/tip.php?tip_id=108

function ToggleFold()

   if foldlevel('.') == 0

      " No fold exists at the current line,

      " so create a fold based on braces

      let x = line('.')    " the current line number

      normal 0

      call search("{")

      normal %

      let y = line('.')    " the current line number

      " Create the fold from x to y

      execute x . "," . y . " fold"

   else

      " Delete the fold on the current line

      normal zd

   endif

endfunction

nmap <space> :call ToggleFold()<cr>