set textwidth=120             | " better done with modeline
set ts=4 sts=4 sw=4 expandtab | " better done with a modeline

"=======================================================================================================================
" SETTINGS:
"=======================================================================================================================
set noautochdir               | " When on, Vim will change the current working directory
set breakindent               | " Every wrapped line will continue visually indented
set clipboard=unnamedplus     | " makes copy and paste work (autoselectplus might work as well)
set cmdheight=2               | " sets the command line's height
set complete+=d               | " scan current and included files for defined name or macro
set complete+=i               | " scan current and included files for completions
set concealcursor=nc          | " limits the display of concealed text to normal and command mode
set conceallevel=2            | " replace escaped chars by their utf-8 representation (useful for LaTeX)
set confirm                   | " asks 'do you want to save?'
set cpoptions+=P              | " makes :w filename set the current buffer to filename
set guicursor=a:block-blinkon100
set hidden                    | " allows switiching buffers even if the current buffer contains changes (displays +)
set hlsearch                  | " highlights all search matches (not as performant!)
set ignorecase smartcase      | " search with ignorecase by default, but use case sensitive search when one captical char is contained
set lazyredraw                | " disables redraw during macro exectution (improves performance)
set linebreak                 | " wrap long lines at char 'breakat', not inside words
set mouse=n                   | " allow mouse in normal mode only, so one can use the terminals c&p feature in insert mode
set mousemodel=popup          | " only in gvim: right click opens a popup-menu
set nocursorcolumn            | " turn visual cursor column off (improves performance)
set nrformats+=alpha          | " allows CTRL-A & CTRL-X to increment and decrement letters, not just numbers
set nofoldenable              | " disable folding, because we have zi to toggle foldenable :)
set exrc                      | " enable exrc, a specific .exrc per project, which can contain usual .vimrc commands
set foldmethod=syntax         | " foldlevel: syntax, indent, manual
set foldcolumn=0              | " I think I don't need this second indicator
set foldclose=all             | " automatically fold, when the cursor leaves the folded area
set foldopen=block,hor,search | " when do we unfold?
set foldtext=Foldtext()       | "
set foldnestmax=1             | " top level folding only
set norelativenumber          | " relative line numbers can speed up navigation, but I could not get used to it till now
set noshowmode                | " because we are using some powerline derivat
set nostartofline             | " when scrolling: do not move the cursor to column 1
set notimeout ttimeout        | " improves performance but is known to cause problems on slow terminals
set ttimeoutlen=50            | " set esc key timeout in ms-
set nowrap                    | " but do not (by default) wrap long lines around
set number                    | " turn line numbers on/off (performance decreases when they are shown)
set pumheight=8               | " Determines the maximum number of items to show in the popup menu for
set path+=**                  | " allow recursive searches for files
set redrawtime=100            | " The time in milliseconds for redrawing the display.
" set restorescreen             | " restores the console after exiting vim
" set shada+=n~/.vim/shada      | " shada file to use
set scrolljump=5              | " how many lines get scrolled into view when cursor reaches the screens edge
set scrolloff=3               | " keeps cursor centered
set splitbelow                | " open new windows below the current one (i find that more intuitive)
set shiftround                | " indent/unindent snaps to multiple of shiftwidths
set shortmess+=I              | " don't give the intro message when starting Vim |:intro|.
set showcmd                   | " essential: show keys of combined commands in the lower right corner (BUT SLOW, makes cursor flickering)
set signcolumn=yes            | " auto=auto hide, yes=always, no=never show the column with error indicators
set showtabline=2             | " 0: never, 1: only if there are at least two tabs, 2:always
set winwidth=30               | " keep NERDTreeWindow at least this size
set winminwidth=0             | " (and all other windows, so TODO: watch out)
set tags+=../tags
" set textwidth=100             | " line length (80 used to be default, but...)
" set colorcolumn=              | " not used, because we have a :match directive for textwidth
set undofile                  | " preserve undo history when closing and reopening buffers (see :help undo-persistenece)
set updatetime=80             | " updates the screen more often
set viminfo+=%                | " restore buffer list
set virtualedit=all           | " virtual edit should be default behaviour, because I don't see any reason against
set writedelay=0
set wildmenu                  | " use a menu in the command line
set wildmode=longest:full     | " do not preselect any entry and show all possible

set nocindent smartindent     | " use smart indent rather then cindent
set noshiftround              | " indent/unindent sna=ps to multiple of shiftwidths
set equalalways               | " do not evenly size windows when opening new or closing old
set nocursorline              | " turn visual cursor line off (improves performance)
"=======================================================================================================================

" START: LOADING PLUGINS
" ↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓
call plug#begin()

Plug 'tpope/vim-surround'             | " plugin makes cs"' inside a line replace " with '
Plug 'tpope/vim-fugitive'             | " the most complete GIT integration plugin
Plug 'godlygeek/tabular'              | " align code on a sign, like :Tab/=
Plug 'mhinz/vim-signify'              | " uses the sign column to indicate added, modified and removed lines
let g:signify_vcs_list = [ 'git' ]    | " use signify only with git (improves speed when loading buffers, see :h signify)
let g:signify_cursorhold_insert     = 1
let g:signify_cursorhold_normal     = 1
let g:signify_update_on_bufenter    = 0
let g:signify_update_on_focusgained = 1

" TESTING:                            | " plugins which I am currently trying...
" Plug 'rkitover/vimpager'
" found this command instead (use as PAGER):
" man -P 'nvim -R -u NORC -c":%!col -b" -c":set buftype=nowrite filetype=man" -' ls
"
" Plug 'Shougo/neocomplete.vim'       | " alternative to YouCompleteMe in some cases
" Plug 'tpope/vim-characterize'       | " normal mode: make ga show character names of Unicode chars (ga shows hex and dec values)

" Colorschemes:
Plug 'chriskempson/base16-vim'        | " not just one high quality color scheme (all named base16-*)
" Plug 'ryanoasis/vim-devicons'         | " eye candy icons

" SCRATCH:                            | " Unobtrusive scratch window
Plug 'mtth/scratch.vim'
nnoremap <F2> :ScratchPreview<CR>

" VIM_ROOTER:                         | " Unobtrusive scratch window
" autocmd BufEnter * lcd %:p:h        | " Plugin vim-rooter get used instead (which is much more sane as well)
Plug 'airblade/vim-rooter'            | " makes :lcd changes to projects (git-)root (code-completion, gf, grep, find)
let g:rooter_targets="/,*.c,*.h"      | " only use rooter for C, not LaTeX or anything else
" Vim rooter can be replaced by :Gcd provided by fugitive :)

" BUFEXPLORER:                        | " a buffer to list all buffers has the advantage, that default /-searches work in there
Plug 'jlanzarotta/bufexplorer'
nnoremap <F12> :ToggleBufExplorer<CR>

" NERDTree: replaces NetRW, as long as it has so many bugs
Plug 'scrooloose/nerdtree'            | "
let NERDTreeIgnore                = ['\.aux$']
let NERDTreeCascadeSingleChildDir = 0 | " I don't get how one can use <m> to create files in that included directory
let NERDTreeChDirMode             = 0
let NERDTreeHiddenFirst           = 1
let NERDTreeMinimalUI             = 1
let NERDTreeShowBookmarks         = 1 | " show bookmarks by default (when opening for the first time)
let NERDTreeWinSize               = 40


" depending on if NERDTree has the focus:
nnoremap <expr>
      \ <leader><leader>
      \ bufwinnr("%")==g:NERDTree.GetWinNum() ? ':NERDTreeClose<CR>' : ':NERDTreeFind<CR>'
nnoremap <expr>
      \ <Tab>
      \ bufwinnr("%")==g:NERDTree.GetWinNum() ? '<C-W><C-W>' : ':bn<CR>'
nnoremap <expr>
      \ <S-Tab>
      \ bufwinnr("%")==g:NERDTree.GetWinNum() ? '<C-W><C-W>' : ':bp<CR>'
" close NERDTree if it is the last remaining window (taken from the official documentation)
" autocmd bufenter *
"       \ if (winnr("$") == 1 && exists("b:NERDTree") && b:NERDTree.isTabTree()) | q | endif
"

" Additional: ========================================.
Plug 'sheerun/vim-polyglot'                           " better syntax highlighting/indentation for multiple languages
let g:javascript_conceal_function             = "ƒ"
let g:javascript_conceal_null                 = "ø"
let g:javascript_conceal_this                 = "@"
let g:javascript_conceal_return               = "⇚"
let g:javascript_conceal_undefined            = "¿"
let g:javascript_conceal_NaN                  = "ℕ"
let g:javascript_conceal_prototype            = "¶"
let g:javascript_conceal_static               = "•"
let g:javascript_conceal_super                = "Ω"
let g:javascript_conceal_arrow_function       = "⇒"

Plug 'majutsushi/tagbar'                              " superseeds taglist-plus, which isn't maintained any more
let g:tagbar_autoclose   = 0
let g:tagbar_autofocus   = 1
let g:tagbar_autoshowtag = 0
let g:tagbar_compact     = 1
let g:tagbar_indent      = 0
let g:tagbar_foldlevel   = 99
nnoremap <leader>l :TagbarToggle<CR>|                 " bind TagBar to Hotkey Ctrl+L
nnoremap <F9> :TagbarToggle<CR>|                      " also bind TagBar to Hotkey F9


" AIRLINE: a fancy status line =========================================================================================
set laststatus=2                                        | " required by AirLine, without status line does not appear until a window split
set background=light

Plug 'itchyny/lightline.vim'
Plug 'taohex/lightline-buffer'

" lightline-buffer ui settings
" replace these symbols with ascii characters if your environment does not support unicode
let g:lightline_buffer_logo                     = '  '
let g:lightline_buffer_readonly_icon            = ''
let g:lightline_buffer_modified_icon            = '✭'
let g:lightline_buffer_git_icon                 = ' '
let g:lightline_buffer_ellipsis_icon            = '..'
let g:lightline_buffer_expand_left_icon         = '◀ '
let g:lightline_buffer_expand_right_icon        = ' ▶'
let g:lightline_buffer_active_buffer_left_icon  = ''
let g:lightline_buffer_active_buffer_right_icon = ''
let g:lightline_buffer_separator_icon           = ' '

" lightline-buffer function settings
let g:lightline_buffer_show_bufnr               = 0
let g:lightline_buffer_rotate                   = 0
let g:lightline_buffer_fname_mod                = ':t'
let g:lightline_buffer_excludes                 = ['vimfiler']
let g:lightline_buffer_maxflen                  = 30
let g:lightline_buffer_maxfextlen               = 3
let g:lightline_buffer_minflen                  = 16
let g:lightline_buffer_minfextlen               = 3
let g:lightline_buffer_reservelen               = 20

" function! MyFiletype()
"   if(exists('b:filetype'))
"     return b:filetype
"   else
"     return &filetype
" endfunction
" autocmd BufEnter * let b:filetype = winwidth(0) > 70 ? (strlen(&filetype) ? WebDevIconsGetFileTypeSymbol() . ':' . &filetype : 'no ft') : ''
"
" function! MyFileformat()
"   return exists('b:fileformat') ? b:fileformat : &fileformat
" endfunction
" autocmd BufEnter * let b:fileformat = winwidth(0) > 70 ? WebDevIconsGetFileFormatSymbol() . ':' .  &fileformat : ''
"
" function! MyBranchname()
"   return exists('b:branchname') ? b:branchname : ''
" endfunction
" autocmd BufEnter * let b:branchname = winwidth(0) > 70 ? fugitive#statusline() : ''

let g:lightline = {
    \   'colorscheme': 'Tomorrow_Night_Bright',
    \   'separator': { 'left': "\ue0b0", 'right': "\ue0b2" },
    \   'subseparator': { 'left': "\ue0b1", 'right': "\ue0b3" },
    \   'active': {
    \     'left': [ [ 'mode', 'paste', 'readonly' ],
    \               [ 'gitbranch', 'absolutepath' ],
    \               [ 'tagbar' ] ],
    \     'right': [ [ 'lineinfo', 'percent' ],
    \                [ 'spell', 'fileencoding', 'fileformat', 'filetype' ] ],
    \   },
    \   'tabline': {
    \     'left': [ [ 'bufferinfo' ], [ 'bufferbefore', 'buffercurrent', 'bufferafter' ], ],
    \     'right': [ [ 'close' ] ],
    \   },
    \   'component': {
    \           'tagbar': '%{tagbar#currenttag("%s", "", "fs")}',
    \   },
    \   'component_expand': {
    \     'buffercurrent': 'lightline#buffer#buffercurrent2',
    \   },
    \   'component_type': {
    \     'buffercurrent': 'tabsel',
    \   },
    \   'component_function': {
    \     'bufferbefore': 'lightline#buffer#bufferbefore',
    \     'bufferafter': 'lightline#buffer#bufferafter',
    \     'bufferinfo': 'lightline#buffer#bufferinfo',
    \     'getcwd': 'getcwd',
    \     'gitbranch': 'fugitive#head'
    \   },
    \ }

" lightline#palette()

"    Plug 'vim-airline/vim-airline'                          | " beautification of the mode line
"    let g:airline_section_c                          = "%F" | " was: %F
"    let g:airline_detect_modified                    = 1    |
"    let g:airline_detect_paste                       = 0    |
"    let g:airline_exclude_preview                    = 0    |
"    let g:airline_inactive_collapse                  = 1    |
"    let g:airline_powerline_fonts                    = 1    |
"    let g:airline_skip_empty_sections                = 1    |
"    let g:airline_extensions                         = []   |
"
"    let g:airline#extensions#tabline#enabled         = 1    |
"    let g:airline#extensions#tabline#left_alt_sep    = ''   |
"    let g:airline#extensions#tabline#left_sep        = ''   |
"    let g:airline#extensions#tabline#right_alt_sep   = ''   |
"    let g:airline#extensions#tabline#right_sep       = ''   |
"    let g:airline#extensions#tabline#fnamemod        = ':t' | " let airline just show the filename without its path
"    let g:airline#extensions#tabline#disable_refresh = 1    | " refresh airline on bufadd ?
"    let g:airline#extensions#tabline#enabled         = 1    |
"    let g:airline#extensions#tabline#show_buffers    = 1    |
"    let g:airline#extensions#tabline#show_tabs       = 0    |
"    let g:airline#extensions#tabline#ignore_bufadd_pat = '\c\vgundo|undotree|vimfiler|tagbar|nerd_tree|preview|^$'
"
"    let g:airline_extensions#branch#enabled          = 1    |
"    let g:airline_extensions#whitespace#enabled      = 0    | " airlines whitespace check is slow :/
"    let b:airline_whitespace_checks                  = ['indent', 'trailing', 'long', 'mixed-indent-file']
"
"    if has('python')
"      let g:airline_extensions#syntastic#enabled     = 1    |
"      let g:airline_extensions#ycm#enabled           = 1    |
"    endif
"
"    let g:airline#extensions#tagbar#flags            = 'f'  | " even though the airline extension is off this controls :h tagbar-extend
"    let g:airline#extensions#tagbar#enabled          = 0    |
"
"    " AIRLINE_Theme:
"    Plug 'vim-airline/vim-airline-themes'                   | " airline themes to match any light and dark terminal using :AirlineTheme
"    let base16colorspace=256                                |
"    let g:airline_theme='base16'                            | " specifies which colorscheme should airline uses
"    let g:airline#themes#base16#constant             = 0    |
"    " let g:solarized_base16 = 1
"    " let g:airline_base16_improved_contrast = 1
"    " let g:airline_theme='badcat'                       | " specifies which colorscheme should airline uses
"    " let g:airline_theme='papercolor'                   | " specifies which colorscheme should ionirline uses

" Autocompleter: =====================================
if has("python")
  " YouCompleteMe: =====================================================================================================
  " Plug 'Valloric/MatchTagAlways'                           " highlights the closing tag/brace/...
  Plug 'Valloric/YouCompleteMe'
  " Plug 'vim-scripts/dbext.vim'                       " dependency to allow db related completions
  let g:ycm_server_python_interpreter                = "python3"
  let g:ycm_add_preview_to_completeopt               = 1   " reuse existing preview window
  let g:ycm_autoclose_preview_window_after_insertion = 1
  let g:ycm_collect_identifiers_from_tags_files      = 0   " Let YCM read tags from Ctags file
  let g:ycm_seed_identifiers_with_syntax             = 1   " Completion for programming language's keyword
  let g:ycm_complete_in_comments                     = 1   " Completion in comments
  let g:ycm_complete_in_strings                      = 1   " Completion in string
  let g:ycm_error_symbol                             = '✖' " insert this as an error symbol in the gutter bar
  let g:ycm_min_num_of_chars_for_completion          = 1
  let g:ycm_use_ultisnips_completer                  = 1   " Default 1, just ensure
  let g:ycm_warning_symbol                           = '➔' " insert this as a warning symbol in the gutter bar
  let g:ycm_confirm_extra_conf                       = 0   " security is overrated
  let g:ycm_key_list_select_completion               = ['<Down>']
  let g:ycm_key_list_previous_completion             = ['<Up>']
  let g:ycm_global_ycm_extra_conf                    = '.ycm_extra_conf.py'
  let g:ycm_semantic_triggers                        = { 'c': [ 're!.' ] }
  let g:ycm_python_binary_path                       = 'python' " the python interpreter of choice (for code checking)
  " let g:ycm_disable_for_files_larger_than_kb         = 16384 " we have faaast computers, don't we?

  " disable <tab>-key for YCM so that it can be used with ultisnips
  let g:ycm_key_list_select_completion=[]
  let g:ycm_key_list_previous_completion=[]


  " SYNTASTIC: =========================================================================================================
  Plug 'scrooloose/syntastic'
  set statusline+=%#warningmsg#
  set statusline+=%{SyntasticStatuslineFlag()}
  let g:LatexBox_latexmk_preview_continuously = 1
  let g:LatexBox_viewer                       = "evince"
  let g:syntastic_always_populate_loc_list    = 1
  let g:syntastic_auto_loc_list               = 0
  let g:syntastic_check_on_open               = 1
  let g:syntastic_check_on_wq                 = 0
  " let g:syntastic_quiet_messages              = {"type":"style"}
  "
  " E221: multiple spaces before Operator
  let g:syntastic_python_flake8_args          = '--max-complexity=10 --max-line-length=120 --exclude venv --doctests --exit-zero --ignore=E221'
  " filter ( = do not display) style/formatting errors and warnings
  let g:syntastic_error_symbol                = '✖'
  let g:syntastic_style_error_symbol          = '✗'
  let g:syntastic_warning_symbol              = '➔'
  let g:syntastic_style_warning_symbol        = '≈'

  " ULTISNIPS: code snippet ==============================================================================================
  Plug 'honza/vim-snippets'                                     " dependency of ultisnips (see below)
  Plug 'SirVer/ultisnips'                        " replaces loremipsum (and many more)
  "let g:UltiSnipsExpandTrigger       = '<C-j>'| " Trigger configuration. Do not use <tab> if you use https://github.com/Valloric/YouCompleteMe.
  "let g:UltiSnipsJumpForwardTrigger  = '<C-j>'| " \
  "let g:UltiSnipsJumpBackwardTrigger = '<C-k>'| " \
  "let g:UltiSnipsListSnippets        = '<C-`>'| " YouCompleteMe includes those, so this isn't necessary
  "let g:UltiSnipsExpandTrigger       = '<leader><tab>'| " Trigger configuration. Do not use <tab> if you use https://github.com/Valloric/YouCompleteMe.
  "let g:UltiSnipsJumpForwardTrigger  = '<PageDown>'| " \
  "let g:UltiSnipsJumpBackwardTrigger = '<PageUp>'| " \
  "let g:UltiSnipsListSnippets        = '<leader><leader>'| " YouCompleteMe includes those, so this isn't necessary

  " Plug 'rhysd/vim-clang-format'
  Plug 'kana/vim-operator-user' " dependency, which allows overriding the = operator for indentation
  autocmd FileType c,cpp,objc map <buffer> = :pyf /usr/share/clang/clang-format.py<CR>
  " let g:clang_format#detect_style_file     = 1
  " autocmd FileType c,cpp,objc map <buffer> = <Plug>(operator-clang-format)

  " JEDI: ==============================================================================================================
  Plug 'davidhalter/jedi-vim'               " jedi gets used to display python function signatures
  let g:jedi#completions_enabled        = 0 " we do not need completions, because we have YouCompleteMe
  let g:jedi#show_call_signatures       = 1 " which sadly does not support signatures like jedi
  let g:jedi#show_call_signatures_delay = 0
  let g:jedi#auto_vim_configure         = 0
  let g:pymode_rope                     = 0 " https://github.com/davidhalter/jedi-vim/issues/163
  " autocmd FileType python jedi.preload_module('os', 'sys', 'math')
  " let g:pymode_options_max_line_length          = 120
  " let g:syntastic_python_flake8_args='--ignore=F821,E302,E501,E241,E301'
endif


call plug#end()                                       | " all plugins are getting loaded on this line, don't remove!
" ↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑
" END: LOADING PLUGINS


" COLORSCHEME:
" uses the default terminal background color as background (allows transparency)
function! ExtendColorTheme()
  " let g:colors_name=""
  " set background=light
  filetype on
  filetype plugin on
  filetype indent on

  syntax on                     | " enable syntax highlighting
  syntax sync minlines=60       | " how many preceding lines will be parsed? (has performance impact)
  " highlight Normal ctermbg=NONE ctermfg=black

  highlight! CursorLineNr cterm=inverse | " ctermbg=black ctermfg=NONE
  highlight! Pmenu ctermbg=LightYellow ctermfg=blue
  highlight! PmenuSel ctermbg=blue ctermfg=LightYellow cterm=bold

  highlight! link PmenuSbar Pmenu
  highlight! PmenuThumb cterm=inverse
  highlight! MoreMsg cterm=inverse
  highlight! link Folded LineNr
  highlight! Cursor guibg=green ctermbg=yellow
  highlight! link VertSplit LineNr
  highlight! SpellBad ctermbg=none
  highlight! SpecialKey ctermfg=19
  highlight! WhiteSpace ctermfg=19

  highlight! link TabLine LineNr
  highlight! TabLineSel ctermbg=blue ctermfg=black
  highlight! link TabLineFill LineNr
  highlight! Search ctermbg=12 ctermfg=0
endfunction
autocmd ColorScheme * call ExtendColorTheme()


if filereadable(expand("~/.config/base16-shell/colortest"))
  let g:base16_shell_path="~/.config/base16-shell/scripts"
endif

let base16colorspace=256
if filereadable(expand("~/.vimrc_background"))
  source ~/.vimrc_background
else
  colorscheme base16-phd
endif




"=======================================================================================================================
" GENERAL:
"=======================================================================================================================

if filereadable("/bin/bash")
  set shell=/bin/bash           | " many scripts rely on bash, but its path varies why it is commented out here
endif


"=======================================================================================================================
" SPELL_CHECKING:
"=======================================================================================================================
let g:spellfile_URL='http://ftp.vim.org/vim/runtime/spell'
set spell            | " enable spell checker
set spelllang=en,de  | " languages for the spell checker
set spellsuggest=10  | " how many words will z= suggest?
set thesaurus+=/home/max/.vim/thesaurus/php.txt

set dictionary=/usr/share/dict/cracklib-small
set complete+=k " make default completer <C-N> respect the dictionary

" set fillchars+=stlnc:\―       | "


if has('autocmd')
    " autocmd VimEnter * let &t_EI .= "\<Esc>[0 q"
    " autocmd VimEnter * let &t_SI = "\<Esc>]12;green\x7"
    autocmd VimLeave * silent !echo -ne "\033]112\007"
endif

"=======================================================================================================================
if has("multi_byte")
  scriptencoding utf-8       | " tell vim that we are using utf-8 here
  set encoding=utf-8         | " we need default utf-8 encoding to use cool chars as line break and so on (see below)
  set termencoding=&encoding | " once we use special chars we assume everybody uses a terminal supporting those

  set fillchars+=fold:\—     | "
  set fillchars+=vert:\│     | " cool vertical split char
  set fillchars+=diff:\      | " a whitespace gets used here

  set listchars=             | " initialize empty listchars
  set listchars+=extends:»   | " symbols used when using :set list (which displays non-printable chars)
  set listchars+=precedes:«  | " symbols used when using :set list (which displays non-printable chars)

  set listchars+=tab:⮁\      | " symbols used when using :set list (which displays non-printable chars)
  set listchars+=trail:·     | " symbols used when using :set list (which displays non-printable chars)
  " set listchars+=eol:↲     | " symbols used when using :set list (which displays non-printable chars)
  " set listchars+=space:·   | " symbols used when using :set list (which displays non-printable chars)
  set showbreak+=›           | " symbol used in the beginning of a wrapped line
  set list
end

if has('cscope') " compiled with cscope support?
  " http://vim.wikia.com/wiki/Cscope
  set cscopetag         | " CTRL-] uses cscope first, then ctags
  set cscopeverbose

  if has('quickfix')
    set cscopequickfix=s+,c+,d+,i+,t+,e+
  endif

  " cnoreabbrev csa cs add
  " cnoreabbrev csf cs find
  " cnoreabbrev csk cs kill
  " cnoreabbrev csr cs reset
  " cnoreabbrev css cs show
  " cnoreabbrev csh cs help
  let @c = ":cs find s <cword>"
endif

" GUI_VERSION:
if has("gui_running")
  set browsedir=buffer
  set toolbar+=text
  set guiheadroom=0
  set guioptions+=eig
  set guioptions-=T   | " toolbar
  set guioptions+=c   | " use console dialogs instead of popups
  set guioptions+=a   | " autoselect: copy&paste using middleclick
  set guioptions+=m   | " remove menu
  set guioptions-=e   | " do not display tabs
  set guioptions-=L   | " do not show left scrollbar
  set guioptions-=r   | " do not show right scrollbar
  set winaltkeys=menu | " behave like other windows: ALT-key can be used to open the menu (and cannot be :remaped)
  set guifont=Dejavu\ Sans\ Mono\ for\ Powerline\ 10
  set guifont=Source\ Code\ Pro\ Semi-Bold\ 10
  " set guifont=Droid\ Sans\ Mono\ for\ Powerline\ 12
" set selectmode=mouse,key,cmd  | " enters vim's select mode when pressing shift-left or shift-END
" set keymodel=startsel,stopsel | " makes shift-left, shift-right available for selecting text
endif

" NEOVIM_incompatible:
if !has('nvim')       | " settings which have been removed from neovim
  set ttymouse=xterm2
  set ttyscroll=100   | " improves speed for terminal vim, incomp. with nvim
  set ttyfast         | " improves speed for terminal vim (incomp. with nvim)
  set nottybuiltin    | " use external termcaps
  " set termguicolors | " When on, uses highlight-guifg and highlight-guibg attributes in the terminal (=24bit color) incomp. with nvim
  "
  let g:loaded_ruby_provider = 1 " disable ruby support
  let g:loaded_python_provider = 1  " disable pthon3
endif

if has("autocmd")
  set modeline                | " set variables specific to a file, like indentation by adding a comment
  " set default completion function in case YouCompleteMe cannot help
  set omnifunc=syntaxcomplete#Complete

  " automatically reload this file when it gets edited
  if !exists("*OnConfigChange")
      function OnConfigChange()
          autocmd! |" Remove all vimrc autocommands
          source $MYVIMRC
          exec lightline#colorscheme()
          exec lightline#update()
          " AirlineRefresh
      endfunction
      autocmd BufWritePost $MYVIMRC call OnConfigChange()
  endif

  augroup set_window_title " {
    " autocmd BufWinEnter quickfix setl statusline=%t
    " autocmd BufEnter * let &titlestring = hostname() . "[vim(" . expand("%:t") . ")]"
    autocmd CursorHold * let &titlestring = "%t|".$USER."@".hostname().":%{expand(\"%:~:.:h\")}%=%y"
    set title
    " autocmd CursorHold * let &titlestring = "Vim (".airline#extensions#tagbar#currenttag().")"

    " set window title for screen(3)
    if &term == "screen"
      set t_ts=k
      set t_fs=\
    endif
    if &term == "screen" || &term == "xterm"
      set titlelen=40
      set title
    endif
  augroup END

  " hitting K over a keyword shows a help in a buffer.
  " Here we define the commands used to look those keywords up
  " as per file type...
  augroup filetype_specific
    autocmd FileType python setlocal keywordprg=pydoc
    autocmd FileType vim    setlocal keywordprg=:help |.
    autocmd FileType c,cpp  setlocal equalprg=clang-format
    autocmd FileType c,cpp  setlocal breakat-=-
    " autocmd FileType c,cpp  setlocal iskeyword-=_

    " the following helps to make file=/etc/something work with gf, but disallows filenames with an equal sign in them
    autocmd FileType conf   setlocal isfname-==

    " keyboard mapping for xml alike languages
    " Alt-Up : Move cursor up one tag
    " Alt-Down: Move cursor down one tag
    " leader-=: tidies currently selected tag and subtags and sorts attributes by name (alphabetically)
    autocmd Filetype html,htmldjango,xml
      \ :nnoremap
              \ <M-Down>
              \ :call search('^ *<', 'e')<CR>:nohlsearch<CR>|
      \ :nnoremap
              \ <M-Up>
              \ :call search('^ *<', 'eb')<CR>:nohlsearch<CR>|
      \ :nnoremap
              \ <leader>=
              \ vat:'<,'>!tidy -xml --wrap 0 --sort-attributes alpha 2>/dev/null<CR>vat=
  augroup END

  augroup ChangeIcon
    "if filereadable("/usr/bin/xseticon")
    "if filereadable("~/.vim/nvim.png")
    " autocmd VimEnter * silent :execute "!xseticon -id $WINDOWID ~/.vim/nvim.png"
    " autocmd VimLeave * silent :execute "!xseticon -id $WINDOWID /usr/share/icons/gnome/32x32/apps/xfce-terminal.png"
    "endif
    "endif
  augroup END

  if has('nvim')
    autocmd TermOpen term://* set nobuflisted
    " use default ESC key to leave insert mode in the internal terminal emulator
    tnoremap <Esc> <C-\><C-n>
  else
    augroup vimonly
      autocmd VimLeave * call system("echo -n $'" . escape(getreg(), "'") . "' | xsel -ib")
    augroup END
  endif

  " autocmd BufNewFile set nobuflisted
  " use the shada/viminfo file to return the cursor to where it was...
  function! ReturnCursor()
    if line("'\"") > 1 && line("'\"") <= line("$")
      exe "normal! g`\""
    endif
  endfunction
  autocmd! BufReadPost * call ReturnCursor()


  augroup ToggleQuickFix
    function! ToggleQuickFix()
      if exists("g:qwindow")
        lclose
        unlet g:qwindow
      else
        try
          lopen 10
          let g:qwindow = 1
        catch
          echo "No Errors found!"
        endtry
      endif
    endfunction
    function! QFixToggle(forced)
      if exists("g:qfix_win") && a:forced == 0
        cclose
        unlet g:qfix_win
      else
        copen 10
        let g:qfix_win = bufnr("$")
      endif
    endfunction

    nmap <script> <silent> <F3> :call ToggleQuickFix()<CR>
    nmap <script> <silent> <F4> :call QFixToggle(0)<CR>
  augroup END


  augroup extra_whitespace " {
    highlight ExtraWhitespace ctermbg=red ctermfg=white guibg=red
    " autocmd BufEnter * syn match ExtraWhitespace /\s\+$/
    autocmd BufEnter * match ExtraWhitespace /\s\+$/
  augroup END "}

  augroup CurrentFileName
    highlight CurrentFileName ctermbg=yellow guibg=yellow


    let @w = ":execute ':match ColorColumn /\\%>'.&textwidth.'v./' | :2match ExtraWhitespace /\\s\\+$/"
  " let @w = ":execute ':match ColorColumn /\\%>'.&textwidth.'v./'"
    " highlight the current files name inside the document...
    let @g = ":exe ':match CurrentFileName /'.escape(expand('%:t'), '.').'/'"
    " put the current files name after the cursor...
    let @f = ":exe ':normal a'.expand('%:t')"

    " grep all buffers for a given string and return result in a quickfix window
    let @q = ":cex [] | bufdo vimgrepadd /foo/g % | cw"

    " change to the current working directory (p like pwd)
    let @p = ":lcd %:p:h"

    let @l = ":let g:signify_vcs_cmds={'git': 'git diff --no-color --no-ext-diff -U0 HEAD^ -- %f'}|:SignifyRefresh"

    let @r = ":exe ':!nvr --servername /tmp/nvimsocket --remote % +'.line('.')|:stopinsert|:set readonly"


    " exec current line as a command, insert output of command (from: https://youtu.be/MquaityA1SM?t=35m45s)
    nnoremap Q !!$SHELL<CR>

    " autocmd BufEnter * @f
  augroup END

  " autocmd VimEnter * set nobuflisted
endif


" ======================================================================================================================
" SHORTCUTS: custom shortcuts
" inoremap <C-Space> <C-x><C-o>
" inoremap <C-@> <C-Space>

" Bind CTRL+Backspace to vims version (CTRL+W) in " <CR> insert mode (only works with gvim)
inoremap
      \ <C-Backspace>
      \ <C-W>

" INDENTATION: allows deindenting a selected block and keeps selection
vnoremap < <gv
vnoremap > >gv

" make shift-home select to the beginning of the line
nnoremap <s-home> v^
nnoremap <s-end> v$

nnoremap <s-down> vj
vnoremap <s-down> j
nnoremap <s-up> vk
vnoremap <s-up> k


" close current buffer with <leader>q...
nnoremap <leader>q :bp<bar>sp<bar>bn<bar>bd<CR>.

nnoremap <silent> <F5> :make<CR>
nnoremap <silent> <F6> :silent syntax sync fromstart<CR>:nohlsearch<CR>:silent match<CR>:silent 2match<CR>:silent 3match<CR>
nnoremap <leader>r :syntax sync fromstart


" INSERT_MODE_MAPPINGS:
" default copy&paste insert key binding (just in insert mode, so it doesn't conflict
" with visual block mode)- would have been nice, but collides with c-w for digraphs
" inoremap <C-V> <C-R>+
"
inoremap <C-S> <C-O>:w<CR>

" NEOVIM_SPECIFIC:
if has('nvim') " only neovim...
  " shortcut \t opens a terminal in a horizontal split
  nnoremap <leader>t :new +terminal<CR>
endif

" ======================================================================================================================
" Deprecated with this configuration, but still useful when deactivating some Plugins

" NETRW: obsolete with NERDTree
let g:netrw_alto          = 0       | " open files on the right
let g:netrw_altv          = 1       | " open files on the right
let g:netrw_banner        = 0       | " display help messages?
let g:netrw_browse_split  = 4       | " 4=open in previous window
let g:netrw_fastbrowse    = 2       | " manually refresh direcory list (avoids display errors)
let g:netrw_hide          = 1       | " show not-hidden files only
let g:netrw_keepdir       = 0
let g:netrw_list_hide     = '^\..*' | " Explore mode: hide files starting with dot
let g:netrw_liststyle     = 3       | " 3=tree
let g:netrw_preview       = 0       | "
let g:netrw_winsize       = 20      | " window size in percent


highlight WordBold ctermbg=LightYellow ctermfg=black cterm=bold gui=bold
let w:m1 = 0
function! HighlightWordUnderCursor()
    if(exists('w:m1') && w:m1 > 0)
      silent! call matchdelete(w:m1)
      let w:m1 = 0
    endif
    let l:currentword = escape(expand('<cword>'), '.')
    if(strlen(l:currentword) > 0)
      let w:m1=100
      silent! call matchadd('WordBold', '\<'.l:currentword.'\>', -1, w:m1)
    endif
endfunction

autocmd! CursorHold,CursorHoldI * call HighlightWordUnderCursor()
if version >= 702 " clean up (see: http://vim.wikia.com/wiki/VimTip396)
  autocmd BufWinLeave * call clearmatches()
endif


" avoids openin an empty buffer when restoring bufferlist from viminfo...
if argc() == 0
    autocmd VimEnter * nested :silent bun
endif
" au BufNewFile,BufRead,BufEnter *.cpp,*.hpp set omnifunc=omni#cpp#complete#Main
" Enable omni completion.
" autocmd FileType css setlocal omnifunc=csscomplete#CompleteCSS
" autocmd FileType html,markdown setlocal omnifunc=htmlcomplete#CompleteTags
" auto complete closing tag name when entering </-[space]
" autocmd Filetype html,markdown,xml iabbrev </ </<C-X><C-O>
" autocmd FileType python setlocal omnifunc=jedi#completions
" following autocommands are there to call neovim functions...
" autocmd FileType python setlocal omnifunc=pythoncomplete#Complete
" autocmd FileType javascript setlocal omnifunc=javascriptcomplete#CompleteJS
" autocmd FileType xml setlocal omnifunc=xmlcomplete#CompleteTags
"
" set termguicolors