vimrc

set nocompatible " not vi compatible

"------------------
" Syntax and indent
"------------------
syntax on " turn on syntax highlighting
set showmatch " show matching braces when text indicator is over them

" highlight current line, but only in active window
augroup CursorLineOnlyInActiveWindow
    autocmd!
    autocmd VimEnter,WinEnter,BufWinEnter * setlocal cursorline
    autocmd WinLeave * setlocal nocursorline
augroup END

filetype plugin indent on " enable file type detection
set autoindent

"---------------------
" Basic editing config
"---------------------
set shortmess+=I " disable startup message
set nu " number lines
"set rnu " relative line numbering
set incsearch " incremental search (as string is being typed)
set hls " highlight search
set listchars=tab:>>,nbsp:~ " set list to see tabs and non-breakable spaces
set lbr " line break
set scrolloff=5 " show lines above and below cursor (when possible)
set noshowmode " hide mode
set backspace=indent,eol,start " allow backspacing over everything
set timeout timeoutlen=1000 ttimeoutlen=100 " fix slow O inserts
set lazyredraw " skip redrawing screen in some cases
set autochdir " automatically set current directory to directory of last opened file
set hidden " allow auto-hiding of edited buffers
set history=8192 " more history
set nojoinspaces " suppress inserting two spaces between sentences
" use 4 spaces instead of tabs during formatting
set expandtab
set tabstop=4
set shiftwidth=4
set softtabstop=4
" smart case-sensitive search
set ignorecase
set smartcase
" tab completion for files/bufferss
set wildmode=longest,list
set wildmenu
set mouse+=a " enable mouse mode (scrolling, selection, etc)
if &term =~ '^screen'
    " tmux knows the extended mouse mode
    set ttymouse=xterm2
endif

set laststatus=2

hi User1 ctermbg=black ctermfg=lightgrey guibg=black guifg=white
hi User2 ctermbg=lightgreen ctermfg=black guibg=lightgreen guifg=black
hi User3 ctermbg=lightred ctermfg=black guibg=lightred guifg=black
hi User4 ctermbg=NONE ctermfg=darkgray guibg=black guifg=darkgray

set statusline=
set statusline+=%#User1#%{(mode()=='n')?'\ \ NORMAL\ ':''}
set statusline+=%#User2#%{(mode()=='i')?'\ \ INSERT\ ':''}
set statusline+=%#User3#%{(mode()=='r')?'\ \ RPLACE\ ':''}
set statusline+=%#Cursor#%{(mode()=='v')?'\ \ VISUAL\ ':''}
set statusline+=\ %n\                       " buffer number

set statusline+=%#Visual#                   " colour
set statusline+=%{&paste?'\ PASTE\ ':''}
set statusline+=%{&spell?'\ SPELL\ ':''}

set statusline+=%#Visual#                   " colour
set statusline+=%R                          " readonly flag
set statusline+=%M                          " modified [+] flag

set statusline+=%#User4#\ %F\               " short file name
set statusline+=%=                          " right align
set statusline+=%#Cursor#\ %Y\              " file type
set statusline+=%#User1#\ %3l:%-2c\         " line:column
set statusline+=%#User1#\ %3p%%\            " percentage

au FileType gitcommit setlocal tw=72
au FileType gitcommit setlocal cc=+1

"--------------------
" Misc configurations
"--------------------

" unbind keys
map <C-a> <Nop>
map <C-x> <Nop>
nmap Q <Nop>

" disable audible bell
set noerrorbells visualbell t_vb=

" open new split panes to right and bottom, which feels more natural
set splitbelow
set splitright

" quicker window movement
nnoremap <C-j> <C-w>j
nnoremap <C-k> <C-w>k
nnoremap <C-h> <C-w>h
nnoremap <C-l> <C-w>l

" movement relative to display lines
nnoremap <silent> <Leader>d :call ToggleMovementByDisplayLines()<CR>
function SetMovementByDisplayLines()
    noremap <buffer> <silent> <expr> k v:count ? 'k' : 'gk'
    noremap <buffer> <silent> <expr> j v:count ? 'j' : 'gj'
    noremap <buffer> <silent> 0 g0
    noremap <buffer> <silent> $ g$
endfunction
function ToggleMovementByDisplayLines()
    if !exists('b:movement_by_display_lines')
        let b:movement_by_display_lines = 0
    endif
    if b:movement_by_display_lines
        let b:movement_by_display_lines = 0
        silent! nunmap <buffer> k
        silent! nunmap <buffer> j
        silent! nunmap <buffer> 0
        silent! nunmap <buffer> $
    else
        let b:movement_by_display_lines = 1
        call SetMovementByDisplayLines()
    endif
endfunction

" toggle relative numbering
nnoremap <C-n> :set rnu!<CR>

" save read-only files
command -nargs=0 Sudow w !sudo tee % >/dev/null

"---------------------
" Local customizations
"---------------------

" local customizations in ~/.vimrc_local
let $LOCALFILE=expand("~/.vimrc_local")
if filereadable($LOCALFILE)
    source $LOCALFILE
endif