Add vim-sensible defaults by default

plugin/polyglot.vim

@@ -7,3 +7,131 @@ endif
 if has('syntax') && !exists('g:syntax_on')
   syntax enable
 endif
+
+" No need to duplicate work
+if exists('g:loaded_sensible')
+	finish
+endif
+
+" Code taken from https://github.com/tpope/vim-sensible
+" and (mostly comments) from https://github.com/sheerun/vimrc
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'sensible')
+	" Autoindent when starting new line, or using `o` or `O`.
+	set autoindent
+
+	" Allow backspace in insert mode.
+	set backspace=indent,eol,start
+
+	" Don't scan included files. The .tags file is more performant.
+	set complete-=i
+
+	" Use 'shiftwidth' when using `<Tab>` in front of a line.
+	" By default it's used only for shift commands (`<`, `>`).
+	set smarttab
+
+	" Disable octal format for number processing.
+	set nrformats-=octal
+
+	" Allow for mappings including `Esc`, while preserving
+	" zero timeout after pressing it manually.
+	" (only vim needs a fix for this)
+	if !has('nvim') && &ttimeoutlen == -1
+		set ttimeout
+		set ttimeoutlen=100
+	endif
+
+	" Enable highlighted case-insensitive incremential search.
+	set incsearch
+
+	" Use <C-L> to clear the highlighting of :set hlsearch.
+	if maparg('<C-L>', 'n') ==# ''
+		nnoremap <silent> <C-L> :nohlsearch<C-R>=has('diff')?'<Bar>diffupdate':''<CR><CR><C-L>
+	endif
+
+	" Always show window statuses, even if there's only one.
+	set laststatus=2
+
+	" Show the line and column number of the cursor position.
+	set ruler
+
+	" Autocomplete commands using nice menu in place of window status.
+	" Enable `Ctrl-N` and `Ctrl-P` to scroll through matches.
+	set wildmenu
+
+	" Keep 5 columns next to the cursor when scrolling horizontally.
+	if !&scrolloff
+		set scrolloff=1
+	endif
+	if !&sidescrolloff
+		set sidescrolloff=5
+	endif
+
+	" When 'wrap' is on, display last line even if it doesn't fit.
+	set display+=lastline
+
+	" Force utf-8 encoding
+	set encoding=utf-8
+
+	" Set default whitespace characters when using `:set list`
+	if &listchars ==# 'eol:$'
+		set listchars=tab:>\ ,trail:-,extends:>,precedes:<,nbsp:+
+	endif
+
+	" Delete comment character when joining commented lines
+	if v:version > 703 || v:version == 703 && has("patch541")
+		set formatoptions+=j
+	endif
+
+	" Search upwards for tags file instead only locally
+	if has('path_extra')
+		setglobal tags-=./tags tags-=./tags; tags^=./tags;
+	endif
+
+	" Fix issues with fish shell
+	" https://github.com/tpope/vim-sensible/issues/50
+	if &shell =~# 'fish$' && (v:version < 704 || v:version == 704 && !has('patch276'))
+		set shell=/usr/bin/env\ bash
+	endif
+
+	" Reload unchanged files automatically.
+	set autoread
+
+	" Increase history size to 1000 items.
+	if &history < 1000
+		set history=1000
+	endif
+
+	" Allow for up to 50 opened tabs on Vim start.
+	if &tabpagemax < 50
+		set tabpagemax=50
+	endif
+
+	" Always save upper case variables to viminfo file.
+	if !empty(&viminfo)
+		set viminfo^=!
+	endif
+
+	" Don't save options in sessions and views
+	set sessionoptions-=options
+	set viewoptions-=options
+
+	" Allow color schemes to do bright colors without forcing bold.
+	if &t_Co == 8 && $TERM !~# '^Eterm'
+		set t_Co=16
+	endif
+
+	" Load matchit.vim, but only if the user hasn't installed a newer version.
+	if !exists('g:loaded_matchit') && findfile('plugin/matchit.vim', &rtp) ==# ''
+		runtime! macros/matchit.vim
+	endif
+
+	" `Ctrl-U` in insert mode deletes a lot. Use `Ctrl-G` u to first break undo,
+	" so that you can undo `Ctrl-U` without undoing what you typed before it.
+	if empty(mapcheck('<C-U>', 'i'))
+		inoremap <C-U> <C-G>u<C-U>
+	endif
+
+	if empty(mapcheck('<C-W>', 'i'))
+		inoremap <C-W> <C-G>u<C-W>
+	endif
+endif