[config/dotfiles.git] / vimrc

" Vim main configuration file.

" Copyright (C) 2008-2012  Simon Ruderich
"
" This file is free software: you can redistribute it and/or modify
" it under the terms of the GNU General Public License as published by
" the Free Software Foundation, either version 3 of the License, or
" (at your option) any later version.
"
" This file is distributed in the hope that it will be useful,
" but WITHOUT ANY WARRANTY; without even the implied warranty of
" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
" GNU General Public License for more details.
"
" You should have received a copy of the GNU General Public License
" along with this file.  If not, see <http://www.gnu.org/licenses/>.


" EDITOR SETTINGS

" Save 'runtimepath' in case it was changed by the system's configuration
" files. Also save 'diff' as set all& resets it; but somehow later (after
" sourcing the vimrc - for example in a VimEnter autocmd) it gets
" automagically restored to the correct value.
if has('eval')
    let s:save_runtimepath = &runtimepath
    let s:save_diff = &diff
endif
" Reset all options (except 'term', 'lines' and 'columns'). This makes sure a
" system wide configuration file doesn't change default values.
set all&
" And restore it after all other options were reset.
if has('eval')
    let &runtimepath = s:save_runtimepath
    let &diff = s:save_diff
    unlet s:save_runtimepath
    unlet s:save_diff
endif

" Make sure Vim (and not Vi) settings are used.
set nocompatible

" Use UTF-8 for all internal data (buffers, registers, etc.). This doesn't
" affect reading files in different encodings, see 'fileencodings' for that.
set encoding=utf-8

" Load my scripts from ~/.vim (my scripts) and ~/.vim/runtime (checkout of Vim
" runtime files) if available.
set runtimepath-=~/.vim
set runtimepath^=~/.vim,~/.vim/runtime

" Don't store swap files in the same directory as the edited file. But only if
" we have a "safe" writable directory available.
if filewritable('~/.tmp') == 2 || filewritable('~/tmp') == 2
    set directory-=.
endif
" But store them in ~/.tmp or ~/tmp (already set by default) if available.
set directory^=~/.tmp

" Disable modelines as they may cause security problems. Instead use
" securemodelines (Vim script #1876).
set nomodeline

" Complete to longest common string (list:longest) and then complete all full
" matches after another (full). Thanks to pbrisbin
" (http://pbrisbin.com:8080/dotfiles/vimrc).
set wildmode=list:longest,full
" Ignore case when completing files/directories.
if exists('+wildignorecase')
    set wildignorecase
endif

" Show completion menu even if only one entry matches.
if exists('+completeopt')
    set completeopt+=menuone
endif

" Increase history of executed commands (:).
set history=1000

" Increase number of possible undos.
set undolevels=1000

" Remember marks (including the last cursor position) for more files.
if has('viminfo')
    set viminfo^='1000
endif

" Use strong encryption if possible, also used for swap/undo files.
if exists('+cryptmethod')
    set cryptmethod=blowfish
endif

" Clear all vimrc-related autocmds. Has to be done here as the vimrc augroup
" is used multiple times.
if has('autocmd')
    augroup vimrc
        autocmd!
    augroup END
endif


" HELPER FUNCTIONS

if has('eval')
" Check if the given syntax group is available. Thanks to bairui in #vim on
" Freenode (2012-02-19 01:15 CET) for the try/catch silent highlight idea.
    function! s:HasSyntaxGroup(group)
        try
            execute 'silent highlight ' . a:group
        " \a = [A-Za-z]
        catch /^Vim\%((\a\+)\)\=:E411/ " 'highlight group not found'
            return 0
        endtry
        return 1
    endfunction

" Check if the given Vim version and patch is available.
    function! s:HasVersionAndPatch(version, patch)
        return v:version > a:version
            \ || (v:version == a:version && has('patch' . a:patch))
    endfunction
endif


" EDIT SETTINGS

" Enable automatic file detection, plugin and indention support.
if has('autocmd')
    filetype off " necessary for pathogen to force a reload of ftplugins
    filetype plugin indent on
endif

" Use UTF-8 file encoding for all files. Automatically recognize latin1 in
" existing files.
set fileencodings=utf-8,latin1

" Always use unix line-endings for new files.
set fileformats=unix,dos

" Wrap text after 78 characters.
set textwidth=78

" Set tabs to 4 spaces, use softtabs.
set shiftwidth=4
set softtabstop=4
set expandtab
" When < and > is used indent/deindent to the next 'shiftwidth' boundary.
set shiftround
" Use the default value for real tabs.
set tabstop=8

" Enable auto indention.
set autoindent

" When joining lines only add one space after a sentence.
set nojoinspaces

" Allow backspacing over autoindent and line breaks.
set backspace=indent,eol

" Start a comment when hitting enter after a commented line (r) and when using
" o or O around a commented line (o).
set formatoptions+=ro
" Don't break a line if was already longer then 'textwidth' when insert mode
" started.
set formatoptions+=l
" Remove comment leader when joining lines where it makes sense.
if <SID>HasVersionAndPatch(703, 541)
    set formatoptions+=j
endif

" Allow virtual editing (cursor can be positioned anywhere, even when there is
" no character) in visual block mode.
set virtualedit=block

" Already display matches while typing the search command. This makes spotting
" errors easy.
set incsearch

" Activate syntax folding.
if has('folding')
    set foldmethod=syntax
    " Only use fold column if we have enough space (for example not in a
    " (virtual) terminal which has only 80 columns).
    if &columns > 80
        set foldcolumn=2
    endif
    set foldlevel=99 " no closed folds at default, 'foldenable' would disable
                     " folding which is not what I want
endif

" Only check case if the searched word contains a capital character.
set ignorecase
set smartcase

" Activate spell checking, use English as default.
if exists('+spell') && has('syntax')
    " But not when diffing because spell checking is distracting in this case.
    if !&diff
        set spell
    endif
    set spelllang=en_us
endif

" Allow buffers with changes to be hidden. Very important for effective
" editing with multiple buffers. Prevents the "E37: No write since last change
" (add ! to override)" warning.
set hidden


" DISPLAY SETTINGS

" Use a dark background. Doesn't change the background color, only sets text
" colors for a dark terminal.
set background=dark

" Use my color scheme if 256 colors are available.
if &t_Co == 256 || has('gui_running')
    colorscheme simon
endif

" Display line numbers.
set number
" But use as little space as possible for the numbers column. Thanks to James
" Vega (http://git.jamessan.com/?p=etc/vim.git;a=summary).
if exists('+numberwidth')
    set numberwidth=1
endif
" Display the ruler with current line/file position. If 'statusline' is used
" then this only affects <C-G>.
set ruler
" Display partial commands in the status line.
set showcmd

" Don't redraw screen when executing macros; increases speed. Thanks to James
" Vega (http://git.jamessan.com/?p=etc/vim.git;a=summary).
set lazyredraw

" Visualize the line the cursor is currently in.
if exists('+cursorline')
    set cursorline
endif

" Highlight all matches on the screen when searching. Use <C-L> (see below) to
" remove the highlighting until the next search.
set hlsearch

" Display some special characters.
set list
set listchars=
" Display tabs as ">--------".
set listchars+=tab:>-
" Display trailing whitespace as "-".
set listchars+=trail:-
" Display markers for long lines when wrapping is disabled.
set listchars+=extends:>,precedes:<
" Display non-breakable space as "!".
if v:version >= 700
    set listchars+=nbsp:!
endif

" Don't draw the vertical split separator by using space as character. Thanks
" to scp1 in #vim on Freenode (2012-06-16 16:12 CEST) for the idea to use a
" non-breakable space. But a simple space works as well, as long as the
" current color scheme is not reset.
if has('windows') && has('folding')
    set fillchars+=vert:\  " comment to prevent trailing whitespace
endif

if has('statusline')
    " Always display the status line even if there is only one window.
    set laststatus=2

    " If there's more than one buffer return "/<nr>" (e.g. "/05") where <nr>
    " is the highest buffer number, otherwise return nothing. Used in
    " 'statusline' to get an overview of available buffer numbers.
    function! StatuslineBufferCount()
        let l:bufnr = bufnr('$')
        if l:bufnr > 1
            let l:result = '/'
            if exists('*printf')
                let l:result .= printf('%02d', l:bufnr)
            else
                " Older Vims don't have printf() (and no .= either). Emulate
                " "%02d".
                if l:bufnr < 10
                    let l:result = l:result . '0'
                endif
                let l:result = l:result . l:bufnr
            endif
            return l:result
        else
            return ''
        endif
    endfunction

    " Like %f but use relative filename if it's shorter than the absolute path
    " (e.g. '../../file' vs. '~/long/path/to/file'). fnamemodify()'s ':.' is
    " not enough because it doesn't create '../'s.
    function! StatuslineRelativeFilename()
        " Display only filename for help files.
        if &buftype == 'help'
            return expand('%:t')
        endif
        " Special case for scratch files.
        if &buftype == 'nofile'
            return '[Scratch]'
        endif

        let l:path = expand('%')
        " No file.
        if l:path == ''
            return '[No Name]'
        endif
        " Path is already relative, nothing to do.
        if stridx(l:path, '/') != 0
            return l:path
        endif

        " Absolute path to this file.
        let l:path = expand('%:p')
        " Shortened path to this file, thanks to bairui in #vim on Freenode
        " (2012-06-23 00:54) for the tip to use fnamemodify(). This is what
        " Vim normally uses as %f (minus some exceptions).
        let l:original_path = fnamemodify(l:path, ':~')
        " Absolute path to the current working directory.
        let l:cwd = getcwd()

        " Working directory completely contained in path, replace it with a
        " relative path. Happens for example when opening a file with netrw.
        " %f displays this as absolute path, but we want a relative path of
        " course.
        if stridx(l:path, l:cwd) == 0
            return strpart(l:path, strlen(l:cwd) + 1)
        endif

        let l:path_list = split(l:path, '/')
        let l:cwd_list  = split(l:cwd,  '/')

        " Remove the common path.
        while l:path_list[0] == l:cwd_list[0]
            call remove(l:path_list, 0)
            call remove(l:cwd_list,  0)
        endwhile

        " Add as many '..' as necessary for the relative path and join the
        " path. Thanks to Raimondi in #vim on Freenode (2012-06-23 01:13) for
        " the hint to use repeat() instead of a loop.
        let l:path = repeat('../', len(l:cwd_list)) . join(l:path_list, '/')

        " Use the shorter path, either relative or absolute.
        if strlen(l:path) < strlen(l:original_path)
            return l:path
        else
            return l:original_path
        endif
    endfunction

    set statusline=
    " on the left
    set statusline+=%02n  " buffer number
    set statusline+=%{StatuslineBufferCount()} " highest buffer number
    set statusline+=:
    if has('modify_fname') && v:version >= 700 " some functions need 7.0
        set statusline+=%{StatuslineRelativeFilename()} " path to current file
        set statusline+=\     " space after path
    else
        set statusline+=%f\   " path to current file in buffer
    endif
    set statusline+=%h    " [help] if buffer is help file
    set statusline+=%w    " [Preview] if buffer is preview buffer
    set statusline+=%m    " [+] if buffer was modified,
                          " [-] if 'modifiable' is off
    set statusline+=%r    " [RO] if buffer is read only

    " on the right
    set statusline+=%=                " right align
    set statusline+=0x%-8B\           " current character under cursor as hex
    set statusline+=%-12.(%l,%c%V%)\  " line number (%l),
                                      " column number (%c),
                                      " virtual column number if different
                                      "                       than %c (%V)
    set statusline+=%P                " position in file in percent
endif


" MAPPINGS (except for plugins, see PLUGIN SETTINGS below)

" noremap is used to make sure the right side is executed as is and can't be
" modified by a plugin or other settings. Except for <Nop> which isn't
" affected by mappings.

" Easy way to exit insert mode. jk is preferred because it's faster.
inoremap jj <Esc>
inoremap jk <Esc>
" Also for command mode, thanks to http://github.com/mitechie/pyvim
" (2010-10-15).
cnoremap jj <C-C>
cnoremap jk <C-C>

" Disable arrow keys for all modes except command modes. Thanks to James Vega
" (http://git.jamessan.com/?p=etc/vim.git;a=summary).
map <Right>  <Nop>
map <Left>   <Nop>
map <Up>     <Nop>
map <Down>   <Nop>
imap <Right> <Nop>
imap <Left>  <Nop>
imap <Up>    <Nop>
imap <Down>  <Nop>
" Also disable arrow keys in command mode, use <C-P>/<C-N> as replacement (see
" below).
cmap <Up>    <Nop>
cmap <Down>  <Nop>
cmap <Right> <Nop>
cmap <Left>  <Nop>

" Use <C-P>/<C-N> as replacement for <Up>/<Down> in command mode. Thanks to
" abstrakt and grayw in #vim on Freenode (2010-04-12 21:20 CEST).
cnoremap <C-P> <Up>
cnoremap <C-N> <Down>

if has('eval')
" Don't move the cursor to the first column for certain scroll commands (<C-F,
" <C-B>, <C-D>, <C-U>). Thanks to jamessan in #vim on Freenode (2011-08-31
" 02:27 CEST) for the 'nostartofline' tip. But I can't use 'nostartofline'
" directly because it also enables that feature for other commands which I
" don't want.

    " Set 'nostartofline' for a single movement.
    function! s:TemporaryNostartofline(movement)
        let l:startofline = &startofline
        set nostartofline
        execute 'normal! ' . a:movement
        let &startofline = l:startofline
    endfunction

    " Thanks to fow in #vim on Freenode (2012-02-16 15:38 CET) for the idea to
    " use "<Bslash><Lt>"; Vim documentation reference: :help <>.
    nnoremap <silent> <C-F>
        \ :call <SID>TemporaryNostartofline("<Bslash><Lt>C-F>")<CR>
    nnoremap <silent> <C-B>
        \ :call <SID>TemporaryNostartofline("<Bslash><Lt>C-B>")<CR>
    nnoremap <silent> <C-D>
        \ :call <SID>TemporaryNostartofline("<Bslash><Lt>C-D>")<CR>
    nnoremap <silent> <C-U>
        \ :call <SID>TemporaryNostartofline("<Bslash><Lt>C-U>")<CR>
endif

" Write before suspending, thanks to deryni in #vim on Freenode (2011-05-09
" 20:02 CEST). To suspend without saving either unmap this or use :stop<CR>.
" Only the current buffer is written, thus switching to another buffer works
" too.
nnoremap <silent> <C-Z> :update<CR>:stop<CR>

" 2<C-G> gives more verbose information, use it by default. Thanks to NCS_One
" in #vim on Freenode (2011-08-15 00:17 CEST).
nnoremap <C-G> 2<C-G>

" Use <Space> to move down a page and - to move up one like in mutt. Don't use
" nnoremap so the <C-F>/<C-B> 'nostartofline' fix (see above) works.
nmap <Space> <C-F>
nmap - <C-B>

" Go to next and previous buffer. Thanks to elik in #vim on Freenode
" (2010-05-16 18:38 CEST) for this idea.
nnoremap <silent> gb :bnext<CR>
nnoremap <silent> gB :bprevious<CR>
if has('eval')
    " But when starting again at the first buffer, print a warning which
    " reminds me that I've already seen that buffer.
    function! s:NextBuffer()
        " Are we currently on the last buffer and moving to the first?
        let l:last_buffer = 0
        if bufnr('%') == bufnr('$') && bufnr('$') > 1
            let l:last_buffer = 1
        endif

        " Go to the next buffer.
        if !l:last_buffer
            bnext

        " Go to the first buffer, silent is necessary or the following message
        " won't be displayed because it's overwritten by the status message
        " displayed when entering a buffer.
        else
            silent bnext

            echohl WarningMsg
            echo 'Starting again at first buffer.'
            echohl None
        endif
    endfunction
    nnoremap <silent> gb :call <SID>NextBuffer()<CR>
endif

" Fast access to buffers.
nnoremap <silent> <Leader>1 :1buffer<CR>
nnoremap <silent> <Leader>2 :2buffer<CR>
nnoremap <silent> <Leader>3 :3buffer<CR>
nnoremap <silent> <Leader>4 :4buffer<CR>
nnoremap <silent> <Leader>5 :5buffer<CR>
nnoremap <silent> <Leader>6 :6buffer<CR>
nnoremap <silent> <Leader>7 :7buffer<CR>
nnoremap <silent> <Leader>8 :8buffer<CR>
nnoremap <silent> <Leader>9 :9buffer<CR>
nnoremap <silent> <Leader>0 :10buffer<CR>

" Make last active window the only window. Similar to <C-W> o.
nnoremap <C-W>O <C-W>p<C-W>o

" Maps to change spell language between English and German and disable spell
" checking.
if exists('+spell')
    nnoremap <silent> <Leader>sn :set nospell<CR>
    nnoremap <silent> <Leader>se :set spell spelllang=en_us<CR>
    nnoremap <silent> <Leader>sd :set spell spelllang=de_de<CR>
endif

" Add semicolon to the end of the line. Thanks to
" http://www.van-laarhoven.org/vim/.vimrc for this idea and godlygeek in #vim
" on Freenode for an improved version which doesn't clobber any marks.
nnoremap <silent> <Leader>; :call setline(line('.'), getline('.') . ';')<CR>

" * and # for selections in visual mode. Thanks to
" http://got-ravings.blogspot.com/2008/07/vim-pr0n-visual-search-mappings.html
" and all nerds involved (godlygeek, strull in #vim on Freenode).
if has('eval')
    function! s:VSetSearch()
        let l:temp = @@
        normal! gvy
        " Added \C to force 'noignorecase' while searching the current visual
        " selection. I want to search for the exact string in this case.
        let @/ = '\C' . '\V' . substitute(escape(@@, '\'), '\n', '\\n', 'g')
        let @@ = l:temp
    endfunction
    vnoremap * :<C-U>call <SID>VSetSearch()<CR>//<CR>
    vnoremap # :<C-U>call <SID>VSetSearch()<CR>??<CR>
endif

" I often type "W" instead of "w" when trying to save a file. Fix my mistake.
" Thanks to Tony Mechelynck <antoine.mechelynck@gmail.com> from the Vim
" mailing list for the commands.
if v:version < 700
    cnoreabbrev W w
    cnoreabbrev Wa wa
    cnoreabbrev Wq wq
    cnoreabbrev Wqa wqa
else
    cnoreabbrev <expr> W
        \ ((getcmdtype() == ':' && getcmdpos() <= 2) ? 'w' : 'W')
    cnoreabbrev <expr> Wa
        \ ((getcmdtype() == ':' && getcmdpos() <= 3) ? 'wa' : 'Wa')
    cnoreabbrev <expr> Wq
        \ ((getcmdtype() == ':' && getcmdpos() <= 3) ? 'wq' : 'Wq')
    cnoreabbrev <expr> Wqa
        \ ((getcmdtype() == ':' && getcmdpos() <= 4) ? 'wqa' : 'Wqa')
endif
" Also fix my typo with "Q".
if v:version < 700
    cnoreabbrev Q q
    cnoreabbrev Qa qa
else
    cnoreabbrev <expr> Q
        \ ((getcmdtype() == ':' && getcmdpos() <= 2) ? 'q' : 'Q')
    cnoreabbrev <expr> Qa
        \ ((getcmdtype() == ':' && getcmdpos() <= 3) ? 'qa' : 'Qa')
endif

" In case 'hlsearch' is used disable it with <C-L>. Thanks to frogonwheels and
" vimgor (bot) in #vim on Freenode (2010-03-30 05:58 CEST).
noremap <silent> <C-L> :nohlsearch<CR><C-L>

" <C-U> in insert mode deletes a lot, break undo sequence before deleting the
" line so the change can be undone. Thanks to the vimrc_example.vim file in
" Vim's source.
inoremap <C-U> <C-G>u<C-U>
" Same for <C-@> (insert previously inserted text and leave insert mode).
inoremap <C-@> <C-G>u<C-@>
" And for <C-A> (insert previously inserted text).
inoremap <C-A> <C-G>u<C-A>
" And for <C-W> (delete word before cursor).
inoremap <C-W> <C-G>u<C-W>

if has('eval')
" New text-objects ii and ai to work on text with the same indentation. Thanks
" to http://vim.wikia.com/index.php?title=Indent_text_object&oldid=27126
" (visited on 2011-11-19).
    onoremap <silent> ai :<C-U>call <SID>IndTxtObj(0)<CR>
    onoremap <silent> ii :<C-U>call <SID>IndTxtObj(1)<CR>
    vnoremap <silent> ai :<C-U>call <SID>IndTxtObj(0)<CR><Esc>gv
    vnoremap <silent> ii :<C-U>call <SID>IndTxtObj(1)<CR><Esc>gv

    function! s:IndTxtObj(inner)
        let curline = line(".")
        let lastline = line("$")
        let i = indent(line(".")) - &shiftwidth * (v:count1 - 1)
        let i = i < 0 ? 0 : i
        if getline(".") !~ "^\\s*$"
            let p = line(".") - 1
            let nextblank = getline(p) =~ "^\\s*$"
            while p > 0
                    \ && ((i == 0 && !nextblank)
                        \ || (i > 0 && ((indent(p) >= i
                            \ && !(nextblank && a:inner))
                            \ || (nextblank && !a:inner))))
                -
                let p = line(".") - 1
                let nextblank = getline(p) =~ "^\\s*$"
            endwhile
            normal! 0V
            call cursor(curline, 0)
            let p = line(".") + 1
            let nextblank = getline(p) =~ "^\\s*$"
            while p <= lastline
                    \ && ((i == 0 && !nextblank)
                        \ || (i > 0 && ((indent(p) >= i
                            \ && !(nextblank && a:inner))
                            \ || (nextblank && !a:inner))))
                +
                let p = line(".") + 1
                let nextblank = getline(p) =~ "^\\s*$"
            endwhile
            normal! $
        endif
    endfunction
endif


" ABBREVIATIONS

" Fix some of my spelling mistakes (German).
inoreabbrev relle reelle
inoreabbrev reele reelle
" Fix some of my spelling mistakes (English).
inoreabbrev completly completely


" SYNTAX SETTINGS

" Activate syntax coloring.
if has('syntax')
    syntax enable

" Don't highlight more than 500 columns as I normally don't have that long
" lines and they slow down syntax coloring. Thanks to Derek Wyatt
" (http://www.derekwyatt.org/vim/the-vimrc-file/).
    if exists('+synmaxcol')
        set synmaxcol=500
    endif

" Use (limited) syntax based omni completion if no other omni completion is
" available. Taken from :help ft-syntax-omni.
    if has('autocmd') && exists('+omnifunc')
        augroup vimrc
            autocmd FileType *
                \ if &omnifunc == '' |
                \     setlocal omnifunc=syntaxcomplete#Complete |
                \ endif
        augroup END
    endif

" Function to enable all custom highlights. Necessary as highlights are
" window-local and thus must be set for each new window.
    function! s:CustomSyntaxHighlights()
        " Not the first time called, nothing to do.
        if exists('w:vimrc_syntax_run')
            return
        endif
        let w:vimrc_syntax_run = 1

" Highlight lines longer than 78 characters. Thanks to Tony Mechelynck
" <antoine.mechelynck@gmail.com> from the Vim mailing list. It can easily be
" disabled when necessary with :2match (in Vim >= 700).
        if !&diff && exists(':2match')
            " Use ColorColumn for overlong lines if available and my color
            " scheme is used.
            if &t_Co == 256 && <SID>HasSyntaxGroup('ColorColumn')
                2match ColorColumn /\%>78v./
            else
                2match Todo /\%>78v./
            endif
        elseif !&diff
            match Todo /\%>78v./
        endif

        if exists('*matchadd')
" Highlight some important keywords in all documents.
            let l:todos = ['TODO', 'XXX', 'FIXME',
                         \ 'CHANGED', 'REMOVED', 'DELETED']
            " Compatibility fix for Vim 6.4 which can't handle for in function
            " (without function it's ignored).
            execute '  for l:x in l:todos'
                  \ '|     call matchadd("Todo", l:x)'
                  \ '| endfor'

" Highlight Unicode whitespace which is no normal whitespace (0x20).
            let l:spaces = ['00a0', '1680', '180e', '2000', '2001', '2002',
                          \ '2003', '2004', '2005', '2006', '2007', '2008',
                          \ '2009', '200a', '200b', '200c', '200d', '202f',
                          \ '205f', '2060', '3000', 'feff']
            " Compatibility fix for Vim 6.4. Escape \ inside the " string or
            " it won't work!
            execute '  for l:x in l:spaces'
                  \ '|     call matchadd("Error", "\\%u" . l:x)'
                  \ '| endfor'

" Special highlight for tabs to reduce their visibility in contrast to other
" SpecialKey characters (e.g. ^L).
            if &t_Co == 256 && <SID>HasSyntaxGroup('specialKeyTab')
                call matchadd('specialKeyTab', '\t')
            endif
        endif
    endfunction
" Enable highlights for the current and all new windows. Thanks to bairui in
" #vim on Freenode (2012-04-01 00:22 CEST) for the WinEnter suggestion.
    call <SID>CustomSyntaxHighlights()
    if has('autocmd')
        augroup vimrc
            autocmd WinEnter * call <SID>CustomSyntaxHighlights()
        augroup END
    endif

" Settings for specific filetypes.

    " C
    let g:c_no_if0_fold = 1 " fix weird double fold in #if0 in recent versions
    " Haskell.
    let g:hs_highlight_delimiters = 1
    let g:hs_highlight_boolean = 1
    let g:hs_highlight_types = 1
    let g:hs_highlight_more_types = 1
    " Perl.
    let g:perl_fold = 1
    let g:perl_fold_blocks = 1
    let g:perl_nofold_packages = 1
    let g:perl_include_pod = 1 " syntax coloring for PODs
    " Python.
    let g:python_highlight_all = 1
    " Shell.
    let g:sh_noisk = 1        " don't add . to 'iskeyword'
    let g:sh_is_posix = 1     " POSIX shell (e.g. dash) is compatible enough
    let g:sh_fold_enabled = 7 " functions (1), heredoc (2) and if/do/for (4)
    " Vim.
    let g:vimsyn_embed = 0      " don't highlight embedded languages
    let g:vimsyn_folding = 'af' " folding for autogroups (a) and functions (f)
    " XML.
    let g:xml_syntax_folding = 1
endif


" PLUGIN SETTINGS

if has('eval')
" Use pathogen which allows one 'runtimepath' entry per plugin. This makes
" installing/removing/updating plugins simple. (Used for plugins with more
" than one file.) Ignore errors in case pathogen is not installed.
    if v:version >= 700
        silent! execute 'call pathogen#infect()'
    endif

" Settings for securemodelines.
    " Only allow items I need (also includes spl which is not enabled by
    " default).
    if v:version >= 700 " need lists
        let g:secure_modelines_allowed_items = ['ft', 'spl', 'fdm',
                                              \ 'sw', 'sts', 'noet']
    endif

" Settings for the NERD commenter.
    " Don't create any mappings I don't want to use.
    let g:NERDCreateDefaultMappings = 0
    " Map toggle comment.
    nmap <Leader><Leader> <Plug>NERDCommenterToggle

" XPTemplate settings.
    " Try to maintain snippet rendering even after editing outside of a
    " snippet.
    let g:xptemplate_strict = 0
    " Don't complete any braces automatically.
    let g:xptemplate_brace_complete = 0
    " Only highlight the current placeholder.
    let g:xptemplate_highlight = 'current'
endif


" AUTO COMMANDS

" Use a custom auto group to prevent problems when the vimrc files is sourced
" twice.
if has('autocmd')
    augroup vimrc

" Go to last position of opened files. Taken from :help last-position-jump.
        autocmd BufReadPost *
            \ if line("'\"") > 1 && line("'\"") <= line('$') |
            \     execute "normal! g'\"" |
            \ endif
" But not for Git commits, go to beginning of the file.
        autocmd BufReadPost COMMIT_EDITMSG normal! gg

" Make sure 'list' and 'number' is disabled in help files. This is necessary
" when switching to a help buffer which is in the background with :buffer as
" these options are local to windows (and not only to buffers). This happens
" because I often want to use only one window and thus the help buffer is in
" the background.
        autocmd BufWinEnter *.txt
            \ if &filetype == 'help' |
            \     setlocal nolist |
            \     setlocal nonumber |
            \ endif

" Automatically disable 'paste' mode when leaving insert mode. Thanks to
" Raimondi in #vim on Freenode (2010-08-14 23:01 CEST). Very useful as I only
" want to paste once and then 'paste' gets automatically unset. InsertLeave
" doesn't exist in older Vims.
        if exists('##InsertLeave')
            autocmd InsertLeave * set nopaste
        endif

" Write file when running :mak[e] before 'makeprg' is called. QuickFixCmdPre
" doesn't exist in older Vims.
        if exists('##QuickFixCmdPre')
            autocmd QuickFixCmdPre * write
        endif

" Don't ignore case while in insert mode, but ignore case in all other modes.
" This causes <C-N>/<C-P> to honor the case and thus only complete matching
" capitalization. But while searching (/) 'ignorecase' is used.
" InsertEnter/InsertLeave doesn't exist in older Vims.
        if exists('##InsertEnter') && exists('##InsertLeave')
            autocmd InsertEnter * set noignorecase
            autocmd InsertLeave * set   ignorecase
        endif

" AFTER/FTPLUGIN AUTO COMMANDS

" Disable spell checking for files which don't need it.
        autocmd FileType deb  setlocal nospell
        autocmd FileType diff setlocal nospell
        autocmd FileType tar  setlocal nospell
" Fix to allow Vim edit crontab files as crontab doesn't work with
" backupcopy=auto.
        autocmd FileType crontab setlocal backupcopy=yes
" Don't use the modeline in git commits as the diff created by `git commit -v`
" may contain one which could change the filetype or other settings of the
" commit buffer. Also make sure we use only 72 characters per line which is
" the recommendation for git commit messages (http://tpope.net/node/106).
        autocmd FileType gitcommit let g:secure_modelines_allowed_items = [] |
                                 \ setlocal textwidth=72
" Use the same comment string as for Vim files in Vimperator files.
        autocmd FileType vimperator setlocal commentstring=\"%s
" Use TeX compiler for (La)TeX files.
        autocmd FileType tex compiler tex

" FTDETECT AUTO COMMANDS

" Recognize .md as markdown files (Vim default is .mkd).
        autocmd BufRead,BufNewFile *.md set filetype=mkd
" Recognize .test as Tcl files.
        autocmd BufRead,BufNewFile *.test set filetype=tcl

" OTHER AUTO COMMANDS

" Disable spell checking, displaying of list characters and long lines when
" viewing documentation.
        autocmd BufReadPost /usr/share/doc/* setlocal nospell nolist | 2match

" Use diff filetype for mercurial patches in patch queue.
        autocmd BufReadPost */.hg/patches/* set filetype=diff

    augroup END
endif


" CUSTOM FUNCTIONS AND COMMANDS

if has('eval')
" Convenient command to see the difference between the current buffer and the
" file it was loaded from, thus the changes you made. Thanks to the
" vimrc_example.vim file in Vim's source. Modified to use the same filetype
" for the diffed file than the filetype for the original file.
    if !exists(':DiffOrig')
        command DiffOrig
            \ let s:diff_orig_filetype = &filetype
            \ | vertical new
            \ | let &filetype = s:diff_orig_filetype
            \ | unlet s:diff_orig_filetype
            \ | set buftype=nofile
            \ | read ++edit #
            \ | 0d_
            \ | diffthis
            \ | wincmd p
            \ | diffthis
    endif
endif