vimrc: Group autocommands, change colorcolumn color

.vimrc

@@ -34,19 +34,35 @@ else
     command CloneVundle execute "!git clone " . vundle_repo . " " . vundle_dir
 endif
 
-set updatetime=1000 " Default is 4s, but reduce it to make things more real time, like git gutter
-highlight Search ctermbg=5
+if !exists("vimrc_autocmds_loaded")
+    let vimrc_autocmds_loaded = 1
 
-filetype plugin indent on    " required
-syntax on
-"
     " Set the filetype based on the file's extension, but only if
     " 'filetype' has not already been set
-augroup filetypedetect
     au BufRead,BufNewFile .i3initrc      setfiletype sh
     au BufRead,BufNewFile *.config       setfiletype conf
     au BufRead,BufNewFile [Ss]nakefile.* setfiletype snakemake
-augroup END
+
+    au BufWritePost * if search('\s\+$', 'wn') | call WhitespaceWarn() | endif
+
+    au BufRead,BufNewFile *    setlocal textwidth=0  | setlocal colorcolumn=
+    au BufRead,BufNewFile *.md setlocal textwidth=80 | setlocal colorcolumn=80
+
+    if exists(":NERDTree")
+        " Open NERDTree if no file specified
+        au StdinReadPre * let s:std_in=1
+        au VimEnter * if argc() == 0 && !exists("s:std_in") | NERDTree | endif
+    endif
+
+    au BufEnter,FocusGained,InsertLeave * set rnu
+    au BufLeave,FocusLost,InsertEnter   * set nornu
+endif
+set updatetime=1000 " Default is 4s, but reduce it to make things more real time, like git gutter
+highlight Search ctermbg=5
+highlight ColorColumn ctermbg=4
+
+filetype plugin indent on    " required
+syntax on
 
 set tabstop=4 " show existing tab with 4 spaces width
 set shiftwidth=4 " when indenting with '>', use 4 spaces width
@@ -75,17 +91,11 @@ function! StripTrailingWhitespace()
     call winrestview(l:save)
     echo "Stripped trailing whitespace"
 endfunction
-au BufRead,BufNewFile *.md setlocal textwidth=80
-autocmd BufWritePost * if search('\s\+$', 'wn') | call WhitespaceWarn() | endif
+
 command TrailWhitespace call StripTrailingWhitespace()
 
 " Hybrid line numbers on active buffer
 set nu rnu
-augroup numbertoggle
-  autocmd!
-  autocmd BufEnter,FocusGained,InsertLeave * set rnu
-  autocmd BufLeave,FocusLost,InsertEnter   * set nornu
-augroup END
 
 " Do incremental searching when it's possible to timeout.
 if has('reltime')
@@ -118,11 +128,6 @@ set statusline+=\ %l:%c"
 set statusline+=%#MoreMsg#
 set statusline+=\ "
 
-if exists(":NERDTree")
-    " Open NERDTree if no file specified
-    autocmd StdinReadPre * let s:std_in=1
-    autocmd VimEnter * if argc() == 0 && !exists("s:std_in") | NERDTree | endif
-endif
 
 " CtrlP
 let g:ctrlp_working_path_mode = 'ra'
@@ -172,11 +177,6 @@ vnoremap <leader>* y:%sno/<c-r>"//g<left><left>
 nmap <F2> :NERDTreeToggle<CR>
 nmap <F3> :NERDTreeFind<CR>
 map <F5> :call CurtineIncSw()<CR>
-nmap <F8> :silent !/home/efjtjkb/bin/comp<enter>
-" Remap <F9> (c-vim uses this)
-"nmap <F9> :silent !/home/efjtjkb/bin/run<enter>
-autocmd VimEnter * noremap <F9> :silent !/home/efjtjkb/bin/run<enter>
-nmap <F10> :silent !/home/efjtjkb/bin/run old<enter>
 
 nmap <Leader>cf :cd %:p:h <CR> " Change dir to parent of current file
 nmap <Leader>cg :cd $git_root_location <CR> " Change dir to git root