vim/parts/main.vim

" Convenient command to see the difference between the current buffer and the
" file it was loaded from, thus the changes you made.
" Only define it when not defined already.
" Revert with: ":delcommand DiffOrig".
if !exists(":DiffOrig")
    command DiffOrig vert new | set bt=nofile | r ++edit # | 0d_ | diffthis
        \ | wincmd p | diffthis
endif

if has("vms")
    set nobackup            " do not keep a backup file, use versions instead
else
    set backup              " keep a backup file (restore to previous version)
    if has('persistent_undo')
        set undofile        " keep an undo file (undo changes after closing)
    endif
endif

" Don't clutter directories with swap files.
" Save them in /tmp instead.
set backupdir=/tmp//,.
set directory=/tmp//,.
set undodir=/tmp//,.



if &t_Co > 2 || has("gui_running")
    " Switch on highlighting the last used search pattern.
    set hlsearch
endif

" Put these in an autocmd group, so that we can delete them easily.
"augroup vimrcEx
 " au!

  " For all text files set 'textwidth' to 78 characters.
"  autocmd FileType text setlocal textwidth=78
"augroup END



" Enable line numbers in the left margin
set number
set numberwidth=4

" Enable relative line numbers
" set relativenumber

" Display invisible characters.
" Here's a helpful list of chars:
" ␠ ⎵ ⏎ ·
set list
set listchars=tab:\ \ \|,trail:·,nbsp:⎵

" jh to escape in insert mode, esc is hard to reach.
"inoremap jh <Esc>

" Clears trailing whitespace while preserving cursor.
function StripTrailingWhitespaces()
    let l = line(".")
    let c = col(".")
    %s/\s\+$//e
    call cursor(l, c)
endfun


augroup clearwhitespace_gp
    autocmd!
    autocmd BufWritePre * :call StripTrailingWhitespaces()
augroup END


" Toggle invisibles in normal mode
nnoremap <F3> :set list! <CR>

" Tab size shortcuts
" TODO: VSCode-like tab menu
nnoremap <C-p> :set tabstop=4 shiftwidth=4 softtabstop=4 noexpandtab<CR>
nnoremap <C-o> :set tabstop=8 shiftwidth=8 softtabstop=4 noexpandtab<CR>

" Autodetect filetypes and set proper indentation
" Default: 4, with tabs.
setlocal tabstop=4 shiftwidth=4 softtabstop=4 noexpandtab
augroup tabsize_gp
    autocmd!
    autocmd Filetype py setlocal tabstop=4 shiftwidth=4 softtabstop=4 noexpandtab
    autocmd Filetype lua setlocal tabstop=4 shiftwidth=4 softtabstop=4 noexpandtab
augroup END

" The matchit plugin makes the % command work better, but it is not backwards
" compatible.
" The ! means the package won't be loaded right away but when plugins are
" loaded during initialization.
if has('syntax') && has('eval')
  packadd! matchit
endif

nmap <F2>           <Plug>ToggleHexHighlight


let g:pencil#textwidth = 70
augroup pencil
  autocmd!
  autocmd FileType markdown,md call pencil#init({'wrap': 'soft'})
  autocmd FileType text         call pencil#init()
  autocmd FileType text         setlocal list
augroup END