My favourite .vimrc (a mess)

.vimrc

set history=10000
set smartcase
set ignorecase
set expandtab
set shiftwidth=3
set softtabstop=3
set smartindent

let hlstate=1
set hlsearch
nmap <silent> <C-N> :silent nohlsearch<CR>

nnoremap <F12> :set invpaste paste?<CR>
set pastetoggle=<F12>
set showmode

:command Wq wq
:command W w
:command Q q

syntax on
set viminfo='2000,\"20000
set backup
set backupdir=$HOME/.vim_backup
set showmatch
set nowrap

set background=dark
if &diff
   colorscheme ron
else
   colorscheme elflord
endif

let mapleader = ","
map <Leader>W :set nowrap<CR>
map <Leader>w :set wrap<CR>
map <Leader>, :q<CR>
map <Leader>k :call SwitchHeader()<CR>
map <Leader>n :tnext<CR>
map <Leader>N :tprev<CR>
map <C-h> <C-]>
map <C-c> :TC<CR>j
imap <C-c> <ESC>:TC<CR>j

map zE zR

" Uncomment the following to have Vim jump to the last position when                                                       
" reopening a file
if has("autocmd")
  autocmd BufReadPost * if line("'\"") > 0 && line("'\"") <= line("$")
    \| exe "normal! g'\"" | endif
endif

" syntax highlight for .launch xml files
filetype on
au BufNewFile,BufRead *.launch set filetype=xml

se modeline
se mouse=a
se modeline

set include=^\\s*#\\s*include\ \\(<boost/\\)\\@!
set diffopt+=iwhite
set ts=3

autocmd BufEnter * :syntax sync fromstart


" This should enable walking INSIDE of wrapped lines instead of jumping over 
" the rest when moving up/down
nnoremap j gj
nnoremap k gk
vnoremap j gj
vnoremap k gk
nnoremap <Down> gj
nnoremap <Up> gk
vnoremap <Down> gj
vnoremap <Up> gk
inoremap <Down> <C-o>gj
inoremap <Up> <C-o>gk