" Basic settings -------------------------------------------------------------

set shell=/bin/bash             " Set default shell
set encoding=utf-8              " Set file encoding to UTF-8
set nomodeline                  " Disable modeline (run code on file open)
set nocompatible                " Reset vi compatibility presets
set backspace=indent,eol,start  " Enable backspace key in insert mode

syntax on                       " Enable syntax highlighting
set clipboard=unnamedplus       " Use system clipboard
set textwidth=79                " Column width to 79
set colorcolumn=79              " Set column to highlight for textwidth
set wrap                        " Visual/soft line wrap
set linebreak                   " Only insert breaks on breakat chars
set nolist                      " Disable line break, see:
set wrapmargin=0                " vim.wikia.com > tip 989
set autoindent                  " Auto-indent on line break
set smartindent                 " Smart indent
set shiftwidth=2                " Set indentation
set tabstop=2
set softtabstop=2
set expandtab                   " Convert tab to spaces
set shiftround                  " Indent in multiples of shiftwidth
set cursorline                  " Highlight current line
set title                       " Show file title
set number                      " Show line numbers
set ruler                       " Show cursor position
set showbreak=↪                 " Show line breaks
set showmatch                   " Show matching opening/closing char
set showcmd                     " Show command used (bottom bar)
set showmode                    " Show current mode (bottom bar)
set wildmenu                    " Enable menu for autocomplete options
set wildmode=list:longest,full  " List matches by longest common sections, all
set wildignore=*.tmp,*~         " Exclude some filetypes from wildmenu
set splitbelow                  " Horizontal split below
set splitright                  " Vertical split to the right
set hidden                      " Switch between buffers without save prompt
                                " To autosave: :set autowrite or autowriteall
set foldenable                  " Enable code folding
set foldmethod=indent           " See :h foldmethod for other options
set foldlevelstart=10           " 0 = all folds closed, 99 = all folds open
set lazyredraw                  " No redraw when running macros
set cryptmethod=blowfish        " Set default encryption method
set history=1000                " Set no. of lines in undo history
set viminfo=                    " Disable viminfo
                                " To move viminfo to ~/.vim instead:
                                " set viminfo+=n~/.vim/viminfo
set noswapfile                  " Disable *.swp files
set noerrorbells                " Disable sounds
set visualbell
set t_vb=
set incsearch                   " Start searching on input
set nohlsearch                  " Disble search highlighting
set ignorecase                  " Ignore case in search for lowercase input
set smartcase                   " Case-sensitive search for mixed case input
set spelllang=en_gb             " Set spell check language
set timeoutlen=2000             " Set timeout (ms) for key mappings
set autochdir                   " Change into a file's directory on open
colorscheme gruvbox             " See :color <tab> for options
set background=dark             " Set light/dark bg for themes that use it


" Highlight trailing whitespace
" https://vi.stackexchange.com/q/8563
highlight ExtraWhitespace guibg=#870000 ctermbg=088
match ExtraWhitespace /\s\+$\|\t/
augroup ExtraWhitespace
  au!
  au BufWinEnter * match ExtraWhitespace /\s\+$/
  au InsertEnter * match ExtraWhitespace /\s\+\%#\@<!$/
  au InsertLeave * match ExtraWhitespace /\s\+$/
augroup END

if !has('gui_running')
  set t_Co=256                  " Use 256 colorscheme in terminal mode
  set mouse=n                   " Disable mouse support
endif

" Omni Complete
set omnifunc=syntaxcomplete#Complete    " Enable autocompletion
set complete=".,b,i"                    " Include current buffer, current file
                                        " other loaded buffers
set dictionary+=~/.vim/dict/other       " Set custom dict


" Key mappings ---------------------------------------------------------------

" Set <leader> key
let mapleader=','

" Move to beginning/end of line
nmap b 0
nmap e $

" Move to prev/next visual row
nmap j gj
nmap k gk

" Keep indent block selected
" https://github.com/bling/dotvim
vmap < <gv
vmap > >gv

" Remap ctrl+d to toggle between shell and vim
nmap <c-d> :sh<cr>

" Disable ctrl+z to avoid accidentally stopping vim
nmap <c-z> <nop>

" Move page down/up
nmap <c-j> <c-f>
nmap <c-k> <c-b>

" Buffer navigation — go to N, prev, next, left, right
nmap <leader>bg :ls<cr>:b
nmap <leader>bh :bprev<cr>
nmap <leader>bl :bnext<cr>
nmap <space>[ <c-w>h<cr>
nmap <space>] <c-w>l<cr>

" Buffer width resize — decrease, increase
nmap <leader>b- :vertical res -5<cr>
nmap <leader>b= :vertical res +5<cr>

" Buffer loading — close, new (vsplit), reload, new (same split)
nmap <leader>bc :bw<cr>
nmap <leader>bn :enew<cr>
nmap <leader>br :e<cr>
nmap <leader>bv <c-w>v:enew<cr>

" Backup file in current buffer
nmap <leader>bk :call BackupFile()<cr>

" Map delete to a black hole register (separate from cut/paste register)
map <leader>d "_d

" Map expression register (used to evaluate expressions)
imap <leader>ee <c-r>=

" Code folding — collapse all, expand all, toggle current fold
nmap <leader>fc zM<cr>
nmap <leader>fe zR<cr>
nmap <leader>ft za<cr>

" Git commands
nmap <leader>ga :!git add .<cr>
nmap <leader>gb :!git branch -b
nmap <leader>gc :!git commit -m
nmap <leader>gca :!git commit<cr>
nmap <leader>gco :!git checkout
nmap <leader>gd :!git diff<cr>
nmap <leader>gf :!git fetch<cr>
nmap <leader>gg :!git grep
nmap <leader>gl :!git log<cr>
nmap <leader>gm :!git merge<cr>
nmap <leader>gph :!git push<cr>
nmap <leader>gpl :!git pull<cr>
nmap <leader>gs :!git status<cr>

" New markdown note
nmap <leader>md :call AddNewFile('$HOME/', '', 'md')<cr>

" Toggle netrw browser
nmap <silent> <leader>nt :call ToggleNetrw()<cr>

" Map OmniComplete
imap <leader>o <c-x><c-o>

" Insert paste into file from cat input
" https://stackoverflow.com/a/2545242
nmap <leader>pp :r! cat<cr>

" Search for selection, prompt for replacement, replace all in file
" https://stackoverflow.com/a/31172452
vnoremap <leader>sa "0y<esc>:%s/<c-r>0//g<left><left>
" Prompt for search/replace text, replace all in selection
vnoremap <leader>sr :s///g<left><left><left>

" Toggle spell check
nmap <leader>sc :setl spell!<cr>

" Search in current directory
nmap <leader>sd :!grep -R  <left>

" Toggle search term highlighting
nmap <leader>sh :set nohlsearch!<cr>

" Sessions — load (waits for file input), save
nmap <leader>sl :source $HOME/.vim/sessions/
nmap <leader>ss :mksession! $HOME/.vim/sessions/

" Tab navigation — close, prev, next, new
" To go directly to tab n: [n]gt
nmap <leader>tc :tabc<cr>
nmap <leader>th :tabp<cr>
nmap <leader>tl :tabn<cr>
nmap <leader>tn :tabe<cr>

" Edit/refresh to apply vimrc changes
nmap <leader>ve :tabe $MYVIMRC<cr>
nmap <leader>vr :source $MYVIMRC<cr>

" Show word count
" https://unix.stackexchange.com/a/145293
nmap <leader>wc g<c-g><cr>
vmap <leader>wc :s/\S\+//gn<cr>

" Trim leading whitespace
" https://unix.stackexchange.com/a/29619
" To reset cursor at first selected line: vmap <leader>wsl :%le<cr>
vmap <leader>wl :normal 0dw<cr>

" Trim trailing whitespace
" http://oualline.com/vim-cook.html#trim
" https://vim.fandom.com/wiki/Remove_unwanted_spaces
nmap <leader>wst :1,$s/[ <tab>]*$//<cr>
vmap <leader>wst :s/\s\+$//<cr>


" Netrw
" ----------------------------------------------------------------------------

" Settings
let g:netrw_banner = 0          " Hide info header
let g:netrw_browse_split = 3    " 0: reuse window, 1: hsplit, 2: vsplit,
                                " 3: new tab, 4: previous window
let g:netrw_dirhistmax = 0      " 0: disable history/bookmarks
let g:netrw_keepdir = 0         " Sync dir view and change dir paths
let g:netrw_liststyle = 0       " 0: thin, 1: long, 2: wide, 3: tree
let g:netrw_winsize = 25        " Set pane width

" Set the default path for the scratchpad used by buffer functions
" Default path: ~/.vim/scratchpad
let g:scratch_dir = 'scratchpad'

" Map keys within the file browser
" https://vonheikemen.github.io/devlog/tools/using-netrw-vim-builtin-file-explorer/
fun! MapNetrwKeys()
  " Toggle hidden file visibility
  nmap <buffer> . gh
  " Files — copy, delete, move, rename, select
  nmap <buffer> fc mc
  nmap <buffer> fd D
  nmap <buffer> fm mm
  nmap <buffer> fr R
  nmap <buffer> v mf
  " Go back in history
  nmap <buffer> h u
  " Close file preview buffer
  nmap <buffer> P <C-w>z
endfun

aug netrw_keymaps
  au!
  autocmd filetype netrw call MapNetrwKeys()
augroup END

" Toggle the file browser
" https://stackoverflow.com/questions/5006950/setting-netrw-like-nerdtree
fun! g:ToggleNetrw()
  Lexplore
  vertical resize 25
endfun


" Functions ------------------------------------------------------------------

" Trim trailing whitespace (can be used on filetype)
" e.g. au BufWrite *.* :call DeleteExtraWS()
" https://amix.dk/vim/vimrc.html
fun! g:DeleteExtraWS()
  exe 'normal mz'
  %s/\s\+$//ge
  exe 'normal `z'
endfun


" Create a new file
fun! g:AddNewFile(path, name, ext)
  let date = strftime('%Y-%m-%d')
  let fn = '-' . a:name
  if a:name == ''
    let fn = ''
  endif
  exe 'tabe' a:path . '/' . date .  fn . '.' . a:ext
endfun


" Backup the file in the current buffer
" https://www.ibm.com/developerworks/library/l-vim-script-2/index.html
fun! g:BackupFile()
  let b:timestamp = strftime('%Y%m%d%H%M%S')
  return writefile(getline(1,'$'), bufname('%') . '-' . b:timestamp)
endfun


" Wrap a word/selection in brackets
" Based on http://learnvimscriptthehardway.stevelosh.com/chapters/09.html
" and https://superuser.com/a/875160
let g:WrapWordChars = {
  \ '<':'>', '{':'}', '[':']', '(':')', '"':'"', "'":"'", '`':'`',
  \ }
fun! g:WrapWord(prefix)
  " Temporarily disable Auto Pairs plugin if enabled
  if exists('b:autopairs_enabled')
    let l:isapenabled = b:autopairs_enabled
    let b:autopairs_enabled = 0
  endif
  " Add key mappings to prefix + char for insert and select modes
  for c in keys(g:WrapWordChars)
    exe 'inoremap <silent>' . a:prefix . c . ' <esc>viw<esc>a' .
        \ g:WrapWordChars[c] . '<esc>bi' . c . '<esc>ea<right>'
    exe 'vnoremap <silent>' . a:prefix . c . ' xi' . c .
        \ g:WrapWordChars[c] . '<esc>P'
  endfor
  " Restore user settings
  if exists('b:autopairs_enabled')
    let b:autopairs_enabled = l:isapenabled
  endif
endfun
call g:WrapWord('<leader>w')


" Filetypes ------------------------------------------------------------------

filetype plugin indent on

" Group autocommand calls to avoid duplicates whenever writing to buffer
" http://learnvimscriptthehardway.stevelosh.com/chapters/14.html
" Set indentation by filetype (not set with other basic settings as they will
" override filetype setl whenever vimrc is reloaded)
" shiftwidth: indent/unindent width
" tabstop: tab width in spaces (view)
" softtabstop: tab width in spaces (edit)
augroup Filetypes
  au!

  " CSS/Sass
  au FileType css,sass,scss setl shiftwidth=2 tabstop=2 softtabstop=2
    \ omnifunc=csscomplete#CompleteCSS

  " Gophermap needs real <tab> to convert maps
  au BufRead,BufNewFile gophermap setl noexpandtab shiftwidth=4 tabstop=4
    \ softtabstop=0 textwidth=70 colorcolumn=70

  " HTML
  au Filetype htm,html setl
    \ foldmethod=indent indentkeys= shiftwidth=2 tabstop=2 softtabstop=2

  " Markdown
  au FileType markdown,md,mkd setl spell shiftwidth=2 tabstop=2 softtabstop=2

  " Vim-inspired app configs
  au BufRead,BufNewFile vifmrc set filetype=vim
  au BufRead,BufNewFile vimperatorrc set filetype=vim
  au FileType vim,vimrc,vimrc* set shiftwidth=2 tabstop=2 softtabstop=2
augroup END


" Plugins --------------------------------------------------------------------

" vim-emoji-complete — insert emoji
let g:emoji_complete_overwrite_standard_keymaps = 0
imap <leader>em <Plug>(emoji-start-complete)

" ALE — syntax check/linting
" Run lint manually
let g:ale_lint_on_enter = 0
let g:ale_lint_on_save = 0
let g:ale_lint_on_text_changed = 'never'
nmap <leader>ld :call ale#cursor#ShowCursorDetail()<cr>
nmap <leader>li :ALELint<cr>
nmap <leader>lj <Plug>(ale_next_wrap)
nmap <leader>lk <Plug>(ale_previous_wrap)

" Auto Pairs — auto-close brackets
let g:AutoPairs = {
  \ '<':'>', '{':'}', '[':']', '(':')',
  \ '"':'"', "'":"'", '`':'`',
  \ '<!--':'-->',
  \ '{%':'%}', '{#':'#}',
  \ }
" Remap/disable unneeded mappings
let g:AutoPairsMapCR = 0
let g:AutoPairsMultilineClose = 0
let g:AutoPairsShortcutFastWrap = '<nop>'
let g:AutoPairsShortcutJump = '<leader>aj'
let g:AutoPairsShortcutToggle = '<leader>ap'

" commentary.vim — code commenting
imap <leader>/ :Commentary<cr>
vmap <leader>/ :Commentary<cr>

" snippet.vim — code/template expansion
" Key mappings in snipmate.vim/after/plugin/snipMate.vim
let g:snippets_dir = '~/.vim/snippets'
imap <leader>. <c-r>=TriggerSnippet()<cr>