"{ Builtin options and settings
" change filechar for folding, vertical split, and message sepator
set fillchars=fold:\ ,vert:\│,msgsep:‾

" Paste mode toggle, it seems that Neovim's bracketed paste mode
" does not work very well for nvim-qt, so we use good-old paste mode
set pastetoggle=<F12>

" Split window below/right when creating horizontal/vertical windows
set splitbelow splitright

" Time in milliseconds to wait for a mapped sequence to complete,
" see https://unix.stackexchange.com/q/36882/221410 for more info
set timeoutlen=1000

" For CursorHold events
set updatetime=2000

" Clipboard settings, always use clipboard for all delete, yank, change, put
" operation, see https://stackoverflow.com/q/30691466/6064933
set clipboard+=unnamedplus

" Disable creating swapfiles, see https://stackoverflow.com/q/821902/6064933
set noswapfile

" Set up backup directory
let g:backupdir=expand(stdpath('data') . '/backup')
if !isdirectory(g:backupdir)
   call mkdir(g:backupdir, "p")
endif
let &backupdir=g:backupdir

set backupcopy=yes  " copy the original file to backupdir and overwrite it

" General tab settings
set tabstop=4       " number of visual spaces per TAB
set softtabstop=4   " number of spaces in tab when editing
set shiftwidth=4    " number of spaces to use for autoindent
set expandtab       " expand tab to spaces so that tabs are spaces

" Set matching pairs of characters and highlight matching brackets
set matchpairs+=<:>,「:」

" Show line number and relative line number
set number relativenumber

" Ignore case in general, but become case-sensitive when uppercase is present
set ignorecase smartcase

" File and script encoding settings for vim
set fileencoding=utf-8
set fileencodings=ucs-bom,utf-8,cp936,gb18030,big5,euc-jp,euc-kr,latin1
scriptencoding utf-8

" Break line at predefined characters
set linebreak
" Character to show before the lines that have been soft-wrapped
set showbreak=↪

" List all items and start selecting matches in cmd completion
set wildmode=list:full

" Show current line where the cursor is
set cursorline
" Set a ruler at column 80, see https://stackoverflow.com/q/2447109/6064933
set colorcolumn=80

" Minimum lines to keep above and below cursor when scrolling
set scrolloff=3

" Use mouse to select and resize windows, etc.
set mouse=nic  " Enable mouse in several mode
set mousemodel=popup  " Set the behaviour of mouse

" Do not show mode on command line since vim-airline can show it
set noshowmode

" Fileformats to use for new files
set fileformats=unix,dos

" The way to show the result of substitution in real time for preview
set inccommand=nosplit

" Ignore certain files and folders when globbing
set wildignore+=*.o,*.obj,*.bin,*.dll,*.exe
set wildignore+=*/.git/*,*/.svn/*,*/__pycache__/*,*/build/**
set wildignore+=*.pyc
set wildignore+=*.DS_Store
set wildignore+=*.aux,*.bbl,*.blg,*.brf,*.fls,*.fdb_latexmk,*.synctex.gz

" Ask for confirmation when handling unsaved or read-only files
set confirm

" Do not use visual and errorbells
set visualbell noerrorbells

" The level we start to fold
set foldlevel=0

" The number of command and search history to keep
set history=500

" Use list mode and customized listchars
set list listchars=tab:▸\ ,extends:❯,precedes:❮,nbsp:+

" Auto-write the file based on some condition
set autowrite

" Show hostname, full path of file and last-mod time on the window title. The
" meaning of the format str for strftime can be found in
" http://man7.org/linux/man-pages/man3/strftime.3.html. The function to get
" lastmod time is drawn from https://stackoverflow.com/q/8426736/6064933
set title
set titlestring=
if g:is_linux
    set titlestring+=%(%{hostname()}\ \ %)
endif
set titlestring+=%(%{expand('%:p:~')}\ \ %)
set titlestring+=%{strftime('%Y-%m-%d\ %H:%M',getftime(expand('%')))}

" Persistent undo even after you close a file and re-open it
set undofile

" Do not show "match xx of xx" and other messages during auto-completion
set shortmess+=c

" Completion behaviour
" set completeopt+=noinsert  " Auto select the first completion entry
set completeopt+=menuone  " Show menu even if there is only one item
set completeopt-=preview  " Disable the preview window

" Settings for popup menu
set pumheight=15  " Maximum number of items to show in popup menu

" Scan files given by `dictionary` option
set complete+=kspell complete-=w complete-=b complete-=u complete-=t

set spelllang=en,cjk  " Spell languages
set spellsuggest+=10  " The number of suggestions shown in the screen for z=

" Align indent to next multiple value of shiftwidth. For its meaning,
" see http://vim.1045645.n5.nabble.com/shiftround-option-td5712100.html
set shiftround

" Virtual edit is useful for visual block edit
set virtualedit=block

" Correctly break multi-byte characters such as CJK,
" see https://stackoverflow.com/q/32669814/6064933
set formatoptions+=mM

" Tilde (~) is an operator, thus must be followed by motions like `e` or `w`.
set tildeop

" Do not add two spaces after a period when joining lines or formatting texts,
" see https://stackoverflow.com/q/4760428/6064933
set nojoinspaces

" Text after this column number is not highlighted
set synmaxcol=500

set nostartofline

" External program to use for grep command
if executable('rg')
    set grepprg=rg\ --vimgrep\ --no-heading\ --smart-case
    set grepformat=%f:%l:%c:%m
endif
"}