" vim: noai:ts=2:sw=2:sts=2 iskeyword+=\:,\!,\<,\>,\-,\& number

"=======================================================================================================================
" GENERAL:
"=======================================================================================================================
set exrc                          | " enable exrc, a specific .exrc per project, which can contain usual .vimrc commands
set textwidth=0                   | " better done with modeline or local exrc and not here
set ts=4 sts=4 sw=4 expandtab     | " better done with a modeline or local exrc
set virtualedit=all               | " virtual edit should be default behaviour, because I don't see any reason against
set nonumber norelativenumber     | " do not show numbers by default, because that causes a performance loss, instead activate them on a file type basis
set ignorecase smartcase hlsearch | " search with ignore case by default, but use case sensitive search when one capital char is contained and highlight while typing (even though its slower)
set cindent cinoptions+=(0        | " indent at parentheses


set path+=**                      | " allow recursive searches for files
let &path = &path.",/usr/lib/modules/".substitute(system('uname -r'), "\n", "", "")."/build/include"

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

"=======================================================================================================================
" Persistent undo
"=======================================================================================================================
if has('persistent_undo')
  if isdirectory('/dev/shm')
    set undodir=/dev/shm/     | " save undo file in memory. That is volatile, but fast and we have GIT for longer lasting undoes
    set directory=/dev/shm/   | " swap file directory to RAM
    set swapfile
  elseif isdirectory('/tmp/')
    set undodir=/tmp/
  endif
  set undofile                  | " preserve undo history when closing and reopening buffers (see :help undo-persistence)
endif

"=======================================================================================================================
" multi byte
"=======================================================================================================================
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)
  let &termencoding=&encoding | " once we use special chars we assume everybody uses a terminal supporting those

  set fillchars=             | " initialize empty fillchars
  set listchars=             | " initialize empty listchars

  if &term == "linux"
    set fillchars+=vert:\│     | " cool vertical split char
  else
    set fillchars+=vert:\║     | " cool vertical split char
  endif

  set fillchars+=fold:\      | "
  set fillchars+=diff:\      | " a white space gets used here

  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:▏\      | "
  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

  " automatically enter list mode when going in insert mode (makes above syntax command temporarily ineffective)
  set nolist
  autocmd InsertEnter * set list
  autocmd InsertLeave * set nolist
" set fillchars+=stlnc:\―       | "
end


"=======================================================================================================================
" SPELL_CHECKING
"=======================================================================================================================
let g:spellfile_URL='http://ftp.vim.org/vim/runtime/spell'
" add local user default spell file as primary source for words
let &spellfile=fnamemodify($MYVIMRC, ":p:h")."/spell/spellfile-user.UTF-8.add"

set nospell          | " disable spell checker by default
set spelllang=en,de  | " languages for the spell checker
set spellsuggest=10  | " how many words will z= suggest?
set thesaurus+=~/.vim/thesaurus/php.txt

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

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

  if has('menu')
   1001menu &Cscope.find.c\ symbol
          \<tab>s
          \ :cscope find s <cword><:cR>
   1001menu &Cscope.find.definition
          \<tab>g
          \ :cscope find g <cword><:cR>
   1001menu &Cscope.find.functions\ called\ by\ this
          \<tab>d
          \ :cscope find d <cword><:cR>
   1001menu &Cscope.find.functions\ calling\ this
          \<tab>c
          \ :cscope find c <cword><:cR>
   1001menu &Cscope.find.text\ string
          \<tab>t
          \ :cscope find t <cword><:cR>
   1001menu &Cscope.find.egrep\ pattern
          \<tab>e
          \ :cscope find e <cword><:cR>
   1001menu &Cscope.find.this\ file
          \<tab>f
          \ :cscope find f <cword><:cR>
   1001menu &Cscope.find.files\ including\ this\ file
          \<tab>i
          \ :cscope find i <cword><:cR>
   1001menu &Cscope.find.places\ where\ this\ symbol\ is\ assigned\ a\ value
          \<tab>a
          \ :cscope find a <cword><:cR>
   1001menu &Cscope.-Sep1-
          \ :
   1001menu &Cscope.create\ and\ add\ database
          \ :cscope kill -1<CR>:execute '!find -type f -regex ".*\.\(c\\|h\\|cpp\\|cxx\\|hh\\|hpp\\|hxx\)$" <bar> cscope -i- -b -q -v'<CR>:cscope add .<CR>
   1001menu &Cscope.-Sep2-
          \ :
   1001menu &Cscope.add\ \.
          \ :cscope add .<CR>
   1001menu &Cscope.show
          \ :cscope show<CR>
   1001menu &Cscope.reset
          \ :cscope reset<CR>
  endif
endif

" ======================================================================================================================
" GUI_VERSION
" ======================================================================================================================
if has("gui_running")
  set guicursor=a:block-blinkon100
  set browsedir=buffer
  set toolbar+=text
  set guiheadroom=0
  set guioptions+=eig
  set guioptions-=T   | " toolbar
  set guioptions+=c   | " use console dialogues instead of popups
  set guioptions+=a   | " auto select: copy&paste using middle click
  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 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


  " its possible to define alternative fonts (order matters)
  set guifont=Monospace\ 10
  set guifont+=Noto\ Sans\ Mono\ Bold
  set guifont+=Noto\ Sans\ Mono\ Bold
  set guifont+=Hasklug\ Nerd\ Font\ Mono\ Semi-Bold\ 10
  set guifont+=Hasklig\ Semi-Bold\ 10
  set guifont+=Bitstream\ Vera\ Sans\ Mono\ 10
  set guifont+=FuraMono\ Nerd\ Font\ Mono\ Medium\ 11
  set guifont+=Source\ Code\ Pro\ for\ Powerline\ SemiBold\ 10
  set guifont+=LiterationMono\ Nerd\ Font\ Mono\ 10
  set guifont+=RobotoMono\ Nerd\ Font\ Medium\ 10
  set guifont+=Source\ Code\ Pro\ Semi-Bold\ 10
  set guifont+=Dejavu\ Sans\ Mono\ for\ Powerline\ Semibold
  set guifont+=Droid\ Sans\ Mono\ for\ Powerline\ 10
  set guifont+=Meslo\ LG\ M\ for\ Powerline\ 10

  " like in the terminal: use Ctrl-shift-v for paste in vim's command editor
  cnoremap <c-s-v> <c-r>*
endif

" ======================================================================================================================
"  SETTINGS:
" ======================================================================================================================
set breakindent               | " Every wrapped line will continue visually indented
set clipboard=unnamedplus     | " makes copy and paste work (autoselectplus might work as well)
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 hidden                    | " allows switching buffers even if the current buffer contains changes (displays +)
set linebreak                 | " wrap long lines at char 'breakat', not inside words
set mousemodel=popup          | " only in gvim: right click opens a pop-up-menu
set mouse=n                   | " allow mouse in normal mode only, so one can use the terminals c&p feature in insert mode
set noautochdir               | " When on, Vim will change the current working directory
set nostartofline             | " when scrolling: do not move the cursor to column 1
set nowrap                    | " but do not (by default) wrap long lines around
set nrformats+=alpha          | " allows CTRL-A & CTRL-X to increment and decrement letters, not just numbers
set incsearch                 | " highlight pattern while entering it (performance wise this isn't that good)

if has('nvim') " Neovim?
set inccommand=nosplit        | " preview substitute and such things in real time
endif

set pumheight=8               | " Determines the maximum number of items to show in the pop-up menu for
set scrolljump=5              | " how many lines get scrolled into view when cursor reaches the screens edge
set scrolloff=0               | " keeps cursor centered
set shiftround                | " indent/un-indent snaps to multiple of shiftwidths
set writedelay=0

" display and performance
set lazyredraw                | " disables redraw during macro execution (improves performance)
set cmdheight=2               | " sets the command line's height
set signcolumn=yes            | " auto=auto hide, yes=always, no=never show the column with error indicators
set nocursorcolumn            | " turn visual cursor column off (improves performance)
set updatetime=80             | " updates the screen more often
set redrawtime=1500           | " Timeout in milliseconds for redrawing the screen (switches syntax off when ssh too slow) / CTRL+L to retry
set notimeout                 | " improves performance but is known to cause problems on slow terminals
set ttimeout ttimeoutlen=150  | " set Esc key timeout in ms-
set showcmd                   | " essential: show keys of combined commands in the lower right corner (BUT SLOW, makes cursor flickering)
set showtabline=2             | " 0: never, 1: only if there are at least two tabs, 2:always
set shortmess+=I              | " don't give the intro message when starting Vim |:intro|.
set wildmenu                  | " use a menu in the command line
set wildmode=longest:full     | " do not preselect any entry and show all possible

" code completion
" set dictionary=/usr/share/dict/cracklib-small
" set complete+=k " make default completer <C-N> respect the dictionary
set complete-=u " scan current and included files
set complete+=i " scan current and included files
set complete+=d " scan current and included files for defined name or macro
set complete+=d               | " scan current and included files for defined name or macro
set complete+=i               | " scan current and included files for completions
set tagcase=match             | " tagcase match, because we mostly use ^] to jump around and that variant respects the upper/lower case [followscs, followic, match, ignore]
set tags+=../tags

" code folding...
set nofoldenable              | " disable folding, because we have zi to toggle foldenable :)
set foldclose=all             | " automatically fold, when the cursor leaves the folded area
set foldcolumn=1              | " I think I don't need this second indicator
" set numberwidth=5
" set foldmethod=syntax         | " foldlevel: syntax, indent, manual / foldmethod=syntax makes Vim incredible slow
set foldnestmax=1             | " top level folding only
set foldopen=block,hor,search | " when do we unfold?
" set foldtext=Foldtext()       | "
" set foldtext=v:folddashes.substitute(getline(v:foldstart),'\\v^/[/*]\','','g')
" set foldtext='⊞\ '.substitute(getline(v:foldstart),'^[\ '.printf(&cms,'').']*','','').'↵'.getline(v:foldstart+1).'↵'.getline(v:foldstart+2)
" set foldtext=repeat('',indent(v:foldstart)).substitute(substitute(substitute(join(getline(v:foldstart,v:foldend)),'\\s\\s\\+\\\|\[\*\/\]','\ ','g'),'\^\\s\\+','','g'),\ '\\s\\s\\+',\ '\ ',\ 'g')
set foldtext=printf('%*s%.*S',indent(v:foldstart),'',&textwidth-indent(v:foldstart),substitute(substitute(join(getline(v:foldstart,v:foldend),'\ '),'[[:space:]]\\+','\ ','g'),'^[[:space:]]','','g'))

" works ...
" set foldexpr=match(synIDattr(synID(v:lnum,indent(v:lnum)+1,0),'name'),'Comment')>-1
set foldexpr=!empty(filter(synstack(v:lnum,indent(v:lnum)+1),{_,val->match(synIDattr(val,'name'),'Comment')>-1}))

" set foldtext=printf('%*s%.'.eval(&textwidth-indent(v:foldstart)).'S',indent(v:foldstart),'',substitute(substitute(substitute(join(getline(v:foldstart,v:foldend)),'\\s\\s\\+\\\|\[\*\/\]','\ ','g'),'\^\\s\\+','','g'),\ '\\s\\s\\+',\ '\ ',\ 'g'))

" vim window behaviour
set splitbelow                | " open new windows below the current one (i find that more intuitive)
set splitright                | " this also works for me and makes better use of the scren space I think
set winminwidth=0             | " (and all other windows, so TODO: watch out)
set winwidth=30               | " keep NERDTreeWindow at least this size


" vim session handling and restore behaviour
set viminfo+=%                | " restore buffer list
set sessionoptions=
set sessionoptions+=buffers
set sessionoptions+=curdir
set sessionoptions+=folds
set sessionoptions+=resize
set sessionoptions+=slash
set sessionoptions+=tabpages
set sessionoptions+=unix
set sessionoptions+=winpos
set sessionoptions+=winsize


" set nocindent smartindent     | " use smart indent rather then cindent
set noautoindent
set nosmartindent

set noshiftround              | " indent/un-indent sna=ps to multiple of shiftwidths
set noequalalways               | " do not evenly size windows when opening new or closing old
set nocursorline              | " turn visual cursor line off (improves performance)
"=======================================================================================================================

" Vim 8 has a terminal command...
if has('terminal')
  " use default ESC key to leave insert mode in the internal terminal emulator
  tnoremap <Esc> <C-W>N
  " make terminal windows hidden by default (copied from :help terminal)
  autocmd BufWinEnter * if &buftype == 'terminal' | setlocal bufhidden=hide | endif
endif


" NEOVIM_incompatible:
"
if has('nvim') " Neovim?
  autocmd TermOpen term://* set nobuflisted
  " use default ESC key to leave insert mode in the internal terminal emulator
  tnoremap <Esc> <C-\><C-n>
" set shada+=n~/.vim/shada      | " shada file to use
"
  menu &UI.&Open\ in\ Serversession
        \ :execute ':!nvr --servername /tmp/nvimsocket --remote % +'.line('.')<CR>:stopinsert<CR>:set readonly<CR>

else           " default Vim?
  autocmd VimLeave * call system("echo -n $'" . escape(getreg(), "'") . "' | xsel -ib")

  set ttymouse=xterm2
  set ttyscroll=100   | " improves speed for terminal vim, incompatible with nvim
  set ttyfast         | " improves speed for terminal vim (incompatible with nvim)
  set nottybuiltin    | " use external termcaps
  set restorescreen   | " restores the console after exiting vim (intentionally not in nvim)
  "
  let g:loaded_ruby_provider = 1 " disable ruby support
  let g:loaded_python_provider = 1  " disable python 3

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


  " scripts from the default vim installation, which do not get loaded by default, but are useful.
  if filereadable($VIMRUNTIME.'/macros/editexisting.vim')
    packadd! editexisting
  endif

  " load default plugin 'matchit' to allow % to jump between tags
  if filereadable($VIMRUNTIME.'/macros/matchit.vim')
    packadd! matchit
  endif

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

  augroup set_window_title " {
    " autocmd BufEnter * let &titlestring = hostname() . "[vim(" . expand("%:t") . ")]"
    autocmd CursorHold * let &titlestring = "%t %y ".$USER."@".hostname().":%{expand(\"%:~:.:h\")}"
    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

  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

  " Fix terminal title =================================================================================================
  " 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"

  " highlight word under the cursor ====================================================================================
  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('BoldUnderline', '\<'.l:currentword.'\>', -1, w:m1)
      endif
  endfunction
  autocmd! CursorHold,CursorHoldI * call HighlightWordUnderCursor()

  " 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-=-

    if filereadable("/usr/bin/vendor_perl/ack")
      autocmd FileType c,cpp  set grepprg=/usr/bin/vendor_perl/ack\ --type=cc\ --nogroup\ --column\ $*
      autocmd FileType c,cpp  set grepformat=%f:%l:%c:%m
    endif

    autocmd BufWinEnter * if &previewwindow | setlocal nonumber signcolumn=no filetype=c nobuflisted | endif


    " 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-==


    autocmd Filetype css command! CSSsort :g/{/+1;/}/-1 sort

    " 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,markdown,xml iabbrev </ </<C-X><C-O>
    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

  " autocmd BufNewFile set nobuflisted
  " use the shada/viminfo file to return the cursor to where it was...
  autocmd BufReadPost * call setpos(".", getpos("'\""))

  augroup CurrentFileName
    " highlight the current files name inside the document...
    let @g = ":exe ':match SpellBad /'.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"

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

    if has('menu')
        source $VIMRUNTIME/menu.vim
        set wildmenu
        set cpo-=<
        set wcm=<C-Z>

        01menu &Functions.toggle\ file\ browser
              \<Tab><leader><leader>
              \ <leader><leader>
        01menu &Functions.-Sep0- :

        01menu &Functions.help
              \<Tab><F1>
              \ <F1>
        01menu &Functions.bp:\ previous\ buffer
              \<Tab><F2>
              \ <F2>
        01menu &Functions.bn:\ next\ buffer
              \<Tab><F3>
              \ <F3>
        01menu &Functions.^wc\:\ close\ window
              \<Tab><F4>
              \ <F4>
        01menu &Functions.-Sep1- :

        01menu &Functions.make
              \<Tab><F5>
              \ <F5>
        01menu &Functions.clear\ matches,\ update\ viewport
              \<Tab><F6>
              \ <F6>
        01menu &Functions.copen\:\ show\ quickfix\ list
              \<Tab><F7>
              \ <F7>
        01menu &Functions.lopen\:\ show\ location\ list
              \<Tab><F8>
              \ <F8>
        01menu &Functions.-Sep2- :

        01menu &Functions.toggle\ tagbar
              \<Tab><F9>
              \ <F9>

        if has("gui_running") == 0
          " in the gui F10 already triggers the menu, not in a terminal vim, so upgrade that...
          map <F10> :emenu <C-Z>
        endif
        01menu &Functions.activate\ menu\ (:emenu)
              \<Tab><F10>
              \ <F10>

        01menu &Functions.undef11
              \<Tab><F11>
              \ <F11>
        01menu &Functions.undef12
              \<Tab><F12>
              \ <F12>
        01menu &Functions.-Sep2- :


        09menu &Directory.print\ current\ directory
              \<Tab>:pwd
              \ :pwd<CR>

        09menu &Directory.-Sep- :

        09menu &Directory.Change\ to\ GIT\ root
              \<Tab>:Gcd
              \ :Gcd<CR>:pwd<CR>

        09menu &Directory.Change\ to\ current\ buffers\ directory\ (global)
              \<tab>:cd\ %:p:h
              \ :cd %:h<CR>:pwd<CR>

        09menu &Directory.Change\ to\ current\ buffers\ directory\ (local\ window)<tab>:lcd\ %:p:h
              \ :lcd %:p:h<CR>:pwd<CR>

        menu &Git.&Display\ uncommited\ files\ in\ location\ list
              \ :call setloclist(0, map(systemlist("git diff --name-only --pretty=''"), {_, p->{'filename': fnamemodify(p, ':.')}}))<CR>:lopen<CR>
        menu &Git.&Display\ recently\ changed\ files\ in\ quickfix\ list
              \ :call setqflist([], 'r', {'title': 'Recently changed in GIT', 'items':map(systemlist("git show --name-only --pretty=''"), {_, p->{'filename': fnamemodify(p, ':.')}}) })<CR>:copen<CR>
        menu &Git.&Display\ last\ changes
              \ :let g:signify_vcs_cmds={'git': 'git diff --no-color --no-ext-diff -U0 HEAD^ -- %f'}<CR>:SignifyRefresh<CR>
        menu &Git.&Display\ unmerged\ files\ in\ location\ list
              \ :call setloclist(0, map(systemlist("git diff --name-only --diff-filter=U \| uniq"), {_, p->{'filename': fnamemodify(p, ':.')}}))<CR>:lopen<CR>
        menu &Git.&Display\ significance\ of\ changes
              \ :!git diff --stat HEAD~1..HEAD
        menu &Git.&Display\ Changed\ files\ compared\ to\ master
              \ :!git diff --name-status ..master

        menu &Match.Clear\ All\ Matches
              \<Tab><F6>
              \ :call clearmatches()<CR>

        menu &Match.-Sep- :

        menu &Match.&dispensable\ white\ spaces
              \ :call matchadd("Convention", '\s\+$', 0)<CR>

        menu &Match.&long\ lines\ (exeeding\ textwidth)
              \ :call matchadd("Convention", '\%>'.&textwidth.'v.', 0)<CR>

        menu &Match.Highlight\ current\ file\ name
              \ :call matchadd("Search", escape(expand('%:t'), '.'))<CR>

        " :execute ':match SpellBad /'.escape(expand('%:t'), '.').'/'<CR>

        menu &Window.-Sep- :


        menu &Window.Scratch
              \ :Scratch<CR>


        menu &Find.file\ under\ the\ cursor
              \<Tab>gf
              \ gf

        menu &Find.Open\ search\ results\ in\ location\ list
              \<Tab>:gf
              \ :execute ':vimgrep /'.escape(getreg('/'), '.').'/g %'<CR>
              \ :copen<CR>

        menu &Changes.list
              \<Tab>:changes
              \ :changes<CR>
        menu &Changes.-Sep- :
        menu &Changes.previous
              \<Tab>g;
              \ g;
        menu &Changes.next
              \<Tab>g,
              \ g,
        menu &List.location.signs\ to\ list
              \<Tab>CMD
              \ :execute ":call setloclist(0, map(get(getbufinfo('%')[0], 'signs'), {_, p->extend(p, {'bufnr':buffer_number('.'), 'text':get(p, 'name')})}))"<CR>
        menu &List.location.list\ to\ signs
              \<Tab>CMD
              \ :call execute(extend(['sign define LocationListEntry text=L', 'sign unplace *'], map(getloclist('%'),  {key, val->'sign place '.(key+100).' name=LocationListEntry line='.val['lnum'].' buffer='.buffer_number('%')})))<CR>
        menu &Jump.list
              \<Tab>:jumps
              \ :jumps<CR>
        menu &Jump.-Sep1- :
        menu &Jump.previous\ position
              \<Tab>CTRL-O
              \ <C-O>
        menu &Jump.next\ position
              \<Tab>CTRL-I
              \ <C-I>
        menu &Jump.-Sep2- :
        menu &Jump.clear\ list
              \<Tab>:clearjumps
              \ :clearjumps

       1000menu &Tag.list
              \<Tab>:tags
              \ :tags<CR>
       1000menu &Tag.selection\ list
              \<Tab>:ts
              \ :ts<CR>

       1000menu &Tag.-Sep1- :

       1000menu &Tag.stack.jump\ older
              \<Tab><C-T>
              \ :po
       1000menu &Tag.stack.jump\
              \<Tab>:ta
              \ :ta
    endif

    " 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 vim's version (CTRL+W) in " <CR> insert mode (only works with gvim)
inoremap
      \ <C-Backspace>
      \ <C-W>

" INDENTATION: allows un-indenting 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>.
" google the word under the cursor
nnoremap <leader>G :execute ":!xdg-open https://google.de/search?q=".expand("<cword>")

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

nnoremap <silent> <A-Up>    :wincmd k<CR>
nnoremap <silent> <A-Down>  :wincmd j<CR>
nnoremap <silent> <A-Left>  :wincmd h<CR>
nnoremap <silent> <A-Right> :wincmd l<CR>

" 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



" ======================================================================================================================
" START: LOADING PLUGINS
" ↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓
call plug#begin()
" Colorschemes:
Plug 'coderonline/vim-remote-menu'
" Plug 'bbchung/clighter8'
" Plug 'octol/vim-cpp-enhanced-highlight'
" Plug 'vim-scripts/TagHighlight'
" if ! exists('g:TagHighlightSettings')
"   let g:TagHighlightSettings = {}
" endif
" let g:TagHighlightSettings['TagFileName'] = 'tags'
" let g:TagHighlightSettings['CtagsExecutable'] = 'ctags'

Plug 'chriskempson/base16-vim'        | " not just one high quality color scheme (all named base16-*)
Plug 'NLKNguyen/papercolor-theme'     | " the one I like the most

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

let g:signify_sign_add               = '≫'
let g:signify_sign_delete            = '≪'
let g:signify_sign_delete_first_line = '≪'
let g:signify_sign_change            = '≶'
let g:signify_sign_changedelete      = g:signify_sign_change


" NERDTree: replaces NetRW, as long as it has so many bugs
Plug 'scrooloose/nerdtree'            | "
let NERDTreeIgnore                = ['\.aux$', '\.o$']
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
let NERDTreeQuitOnOpen            = 1

" depending on if NERDTree has the focus:
nnoremap <expr>
       \ <leader><leader>
       \ bufwinnr("%")==g:NERDTree.GetWinNum() ? ':NERDTreeClose<CR>' : ':NERDTreeFind<CR>'
nnoremap <expr>
       \ <F2>
       \ bufwinnr("%")==g:NERDTree.GetWinNum() ? '<C-W><C-W>' : ':N<CR>'

nnoremap <expr>
       \ <F3>
       \ bufwinnr("%")==g:NERDTree.GetWinNum() ? '<C-W><C-W>' : ':n<CR>'

nnoremap <F4>
       \ :wincmd c<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
"


" map CTRL-PageUp/Down to next/previous buffer
" and Shift-PageUp/Down to next/previous arglist file
nnoremap <C-PageUp> :bn<CR>
nnoremap <C-PageDown> :bp<CR>
nnoremap <S-PageUp> :N<CR>
nnoremap <S-PageDown> :n<CR>


" 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       = "⇒"


" indent within <script> and <style> (default is a zero indent)
let g:html_indent_script1 = "inc"
let g:html_indent_style1 = "inc"

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 <F9> :TagbarToggle<CR>| " bind TagBar to hotkey F9

" Autocompleter: =====================================
if has("python") || has('python3')

  " ULTISNIPS: code snippet ============================================================================================
  Plug 'honza/vim-snippets'                      " dependency of ultisnips (see below)
  Plug 'SirVer/ultisnips'                        " replaces loremipsum (and many more)
  " let g:UltiSnipsExpandTrigger       = '<Tab>'|  " expands the snippet, be careful not to use <tab> elsewhere (ycm uses it by default, but it has been deactivated by g:ycm_key_list_select_completion)
  let g:UltiSnipsExpandTrigger       = '<Tab>'|  " expands the snippet, be careful not to use <tab> elsewhere (ycm uses it by default, but it has been deactivated by g:ycm_key_list_select_completion)

  let g:UltiSnipsJumpForwardTrigger  = '<Tab>'|
  let g:UltiSnipsJumpBackwardTrigger = '<S-Tab>'|
  "d let g:UltiSnipsJumpForwardTrigger  = '<PageDown>'
  " let g:UltiSnipsJumpBackwardTrigger = '<PageUp>'
  "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:UltiSnipsListSnippets        = '<leader><leader>'| " YouCompleteMe includes those, so this isn't necessary
  """ Ultisnips
  " let g:UltiSnipsExpandTrigger="<c-tab>"
  " let g:UltiSnipsListSnippets="<c-s-tab>"

  if has('nvim')
    Plug 'Shougo/deoplete.nvim', { 'do': ':UpdateRemotePlugins' }
    " Use deoplete.
    let g:deoplete#enable_at_startup = 1
    inoremap <silent><expr> <C-Space> deoplete#mappings#manual_complete()

    Plug 'Shougo/echodoc.vim'
    let g:echodoc#enable_at_startup = 1

    " Plug 'Rip-Rip/clang_complete'
    " Plug 'tweekmonster/deoplete-clang2'
    "     Plug 'zchee/deoplete-clang'
    "     let g:deoplete#sources#clang#libclang_path           = "/usr/lib/libclang.so"
    "     let g:deoplete#sources#clang#clang_header            = "/usr/lib/clang/6.0.0"
    "     let g:deoplete#sources#clang#std#cpp                 = 'c++1z'
    " let g:deoplete#sources#clang#clang_complete_database = "/home/max/src"
    " Plug 'Shougo/neoinclude.vim' " makes vim slow - unfortunatelly

    " Plug 'Shougo/deoplete-clangx' " mentioned in Q&A of deoplete
    Plug 'autozimu/LanguageClient-neovim', {
          \ 'branch': 'next',
          \ 'do': 'bash install.sh',
          \ }

    let g:LanguageClient_serverCommands = {
          \ 'cpp': ['clangd']
          \ }
    " Plug 'roxma/nvim-completion-manager' unmaintained python version
  else
    " YouCompleteMe: =====================================================================================================
    " Plug 'Valloric/MatchTagAlways'                           " highlights the closing tag/brace/...
    Plug 'Valloric/YouCompleteMe', {
      \ 'do' : 'python install.py --clang-completer --system-libclang --quiet',
      \ }
    let g:ycm_error_symbol                             = '✖' " insert this as an error symbol in the gutter bar/sign column
    let g:ycm_warning_symbol                           = '➔' " insert this as a warning symbol in the gutter bar/sign coloumn

    let g:ycm_autoclose_preview_window_after_insertion = 0
    let g:ycm_auto_trigger                             = 1
    let g:ycm_collect_identifiers_from_tags_files      = 1   " Let YCM read tags from Ctags file
    let g:ycm_confirm_extra_conf                       = 0   " security is overrated ;)
    let g:ycm_always_populate_location_list            = 0   " we can manually run :YcmDiags to do that

    let g:ycm_key_list_previous_completion             = ['Up']
    let g:ycm_key_list_select_completion               = ['Down']

    " Plug 'vim-scripts/dbext.vim'                       " dependency to allow db related completions
    " let g:ycm_server_python_interpreter                = 'python3'
    " let g:ycm_python_binary_path                       = '/usr/bin/python3' " the python interpreter of choice (for code checking)
    " let g:ycm_add_preview_to_completeopt               = 1   " reuse existing preview window
    " 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_min_num_of_chars_for_completion          = 6   " we normally avoid identifier based completion, it just helps with long words. Use semantic completions with <C-Space> instead (terrible idea, html snippets not working!)
    " let g:ycm_min_num_identifier_candidate_chars       = 4
    " let g:ycm_max_num_identifier_candidates            = 10
    " let g:ycm_max_num_candidates                       = 50
    " let g:ycm_use_ultisnips_completer                  = 1   " Default 1, just ensure
    " 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_disable_for_files_larger_than_kb         = 16384 " we have faaast computers, don't we?
    " let g:ycm_show_diagnostics_ui                      = 0
    " " 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=[]
  endif


  " SYNTASTIC: =========================================================================================================
  if has('nvim')
    Plug 'w0rp/ale'
    let g:ale_set_highlights = 0
    highlight! link ALEWarningSign FoldColumn
    let g:ale_sign_error       = ''
    let g:ale_sign_style_error = ''
    let g:ale_sign_info        = ''
    let g:ale_sign_warning     = ''
  else
    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        = '≈'
  endif

  " 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 " has("python")

"=======================================================================================================================
" TESTING:                            | " plugins which I am currently trying...
"=======================================================================================================================
" Plug 'rhysd/vim-clang-format'     | unnecessary, because we can just :pyf /usr/share/clang/clang-format.py
Plug 'kana/vim-operator-user' " dependency, which allows overriding the = operator for indentation

" TODO: check if this is unrequired, when set equalprog is set to that py file
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)

" Plug 'tpope/vim-characterize'       | " normal mode: make ga show character names of Unicode chars (ga shows hex and dec values)
" 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

command BuffersToArg :exec ':args '.join(map(range(0, bufnr('$')), 'fnameescape(fnamemodify(bufname(v:val), ":."))'))
command BufToArg :argadd %:.
command Gbranch call setqflist([], 'r', {'title':'Git branch selector','items':map(systemlist("git branch"), {_, p->{'filename':'branch','module': fnamemodify(p, ':.')}})})

" the following command opens a preview-window and shows the declaration of
" the function under the cursor. It also highlights the word to make it easier
" to spot within a great file
command Helpme au! CursorHold * nested let @/=expand('<cword>')|exe "silent! psearch ".expand("<cword>")

"=======================================================================================================================
call plug#end()                                       | " all plugins are getting loaded on this line, don't remove!

" ↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑
" END: LOADING PLUGINS
" ======================================================================================================================

" 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

" ======================================================================================================================
" COLORSCHEME:
" ======================================================================================================================

function! ExtendColorTheme()
  " let g:status_fg=synIDattr(hlID('Cursor'), 'fg#')
  " let g:status_bg=synIDattr(hlID('Cursor'), 'bg#')
  " let g:status_sel=synIDattr(hlID('Text'), 'fg#')
  " let g:status_sel='#ffffff'
  let g:status_fg='#00aa00'
  let g:status_bg='#000000'
  let g:status_sel='#ffff00'

  " execute 'highlight! StatusLine'
  "       \ .' guibg=NONE'
  "       \ .' guifg='.g:status_bg
  "       \ .' gui=inverse'

  " " execute 'highlight! User1 gui=NONE'
  " execute 'highlight! User1 guibg='.g:status_sel
  " execute 'highlight! User1 guifg='.g:status_fg

  " execute 'highlight! User2 gui=NONE'
  " execute 'highlight! User2 guibg='.g:status_sel
  " execute 'highlight! User2 guifg=NONE'


  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)

  " use the default terminal background color as background (allows transparency)
  " highlight! Normal guibg=NONE ctermbg=NONE
  " highlight! NonText guibg=NONE guifg=black ctermbg=NONE ctermfg=black

  " make the ~ (tilde) indicator invisible, which usually marks the EOF
  highlight! link EndOfBuffer Ignore

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

  highlight! link PmenuSbar Pmenu
  highlight! PmenuThumb cterm=inverse
  highlight! MoreMsg cterm=inverse

  highlight! link LineNr Comment
  highlight! link Folded Comment
  highlight! link SignColumn Comment
  highlight! link FoldColumn Comment
  " highlight! Folded ctermbg=NONE
  " highlight! Cursor guibg=#729fcf ctermbg=yellow
  highlight! link VertSplit NonText
  " 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=LightYellow ctermfg=12 guibg=#fefd86 guifg=#222222
  highlight! link WildMenu Search

  " generic, which should exist but don't
  highlight! SignifySignAdd ctermbg=NONE
  highlight! Bold cterm=bold gui=bold
  highlight! Italic cterm=italic gui=italic
  highlight! Underline cterm=underline gui=underline
  highlight! BoldUnderline cterm=bold,underline gui=bold,underline
  highlight! BoldItalic cterm=Bold,Italic gui=Bold,Italic

  " make tab stop (see listchars) less disturbing...
  highlight! link SpecialKey NonText

  " highlight! link LightlineMiddle_tabline ColorColumn
  " highlight! link LightlineLeft_tabline_1 ColorColumn
  " highlight! link LightlineLeft_tabline_0_1 ColorColumn

  highlight! Todo guibg=#ffffaa guifg=#000000 gui=bold term=bold
  highlight! cStatement guifg=red gui=bold term=bold

  highlight! link Convention Error


  highlight! link SignifySignAdd             LineNr
  highlight! link SignifySignChange          LineNr
  highlight! link SignifySignDelete          LineNr
  highlight! link SignifySignChangeDelete    LineNr
  highlight! link SignifySignDeleteFirstLine LineNr

  highlight! SpellBad ctermbg=NONE ctermfg=red cterm=NONE
  highlight! link YcmErrorSign   SpellBad
  highlight! link YcmWarningSign Spellbad

  " autocmd InsertLeave * call matchadd('Conceal', ' \+$', -1, 101, { 'conceal': '⟶' })
  autocmd InsertEnter * silent! call matchdelete(101)
  autocmd InsertLeave * silent! call matchadd('Convention', ' \+$', -1, 101, { 'conceal': '⟶' })

  " Show trailing whitepace and spaces before a tab as part of the syntax highlighting
  " autocmd BufEnter,InsertLeave * syntax match Convention /\s\+$\| \+\ze\t/ containedin=ALL
  " autocmd Syntax * syntax match Convention /\s\+$\| \+\ze\t/ containedin=ALL
  " autocmd BufEnter,BufWritePost * syntax match Convention /\s\+$\| \+\ze\t/ containedin=ALL
  " autocmd InsertEnter * syntax clear Convention
  " autocmd BufEnter,InsertLeave * execute ':syntax match Convention /\%>'.&textwidth.'v./ containedin=ALL'

  autocmd InsertEnter * set colorcolumn=80,120
  autocmd InsertLeave * set colorcolumn&
  " set colorcolumn=                  | " not used, because we have a :match directive for textwidth
  "
" if argc() == 0
  " rv
  " autocmd VimEnter * split +bro\ ol
  " endif
endfunction
autocmd! ColorScheme * call ExtendColorTheme()



" ======================================================================================================================
" CONVENIENCE:
" ======================================================================================================================
command Vimls
      \ call setloclist(0, map(getbufinfo({'buflisted':1}),
      \ "{'bufnr': v:val.bufnr,
      \   'lnum': v:val.lnum,
      \   'text': '='.printf('%*s, % 3d: %s [%s]', winwidth(0) / 2, '', v:val.bufnr, v:val.name, getbufvar(v:val.bufnr, '&buftype')),
      \   'pattern': 'not loaded'}
      \ "))

command Ctoggle
      \ if(get(getqflist({'winid':1}), 'winid') == win_getid())|cclose|else|botright copen|endif
command Ltoggle
      \ if(get(getloclist(0, {'winid':1}), 'winid') == win_getid())|lclose|else|lopen|endif



" nnoremap <silent> <ESC> :lclose<CR> " brings vim into REPLACE mode (R)
nnoremap <silent> <F7>  :Ltoggle<CR>
nnoremap <silent> <F8>  :Ctoggle<CR>
nnoremap <silent> <F12> :Vimls<CR>:Ltoggle<CR>

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


" ======================================================================================================================
" TESTING:
" ======================================================================================================================
" avoids openin an empty buffer when restoring bufferlist from viminfo...
" if argc() == 0
"     silent autocmd VimEnter * nested :silent bun
" endif

autocmd TextYankPost * echo '> text yanked to '.(
      \ get(v:event,'regname') == ''
      \ ? 'default register'
      \ : 'register '.get(v:event,'regname'))

autocmd VimEnter,WinEnter * exec ':set scrolljump='.winheight(0)/2

" display highlight group under the cursor
map <leader>h :echo map(synstack(line('.'), col('.')), 'synIDattr(v:val, "name")')<CR>

if filereadable(expand("~/.vimrc_background")) && filereadable(expand("~/.config/base16-shell/colortest"))
  let g:base16_shell_path="~/.config/base16-shell/scripts"
  let base16colorspace=256
  " let syntax_cmd="skip" " vim internal, use base16 and no default colors
  set background=dark
  source ~/.vimrc_background
else
  let g:PaperColor_Theme_Options = {
        \   'theme': {
        \     'default': {
        \       'transparent_background': 0
        \     }
        \   }
        \ }
  set background=light
  colorscheme PaperColor
endif


augroup status
  set noshowmode    | " mode will be shown twice, in lightline and below, so we want to deactivate one
  set laststatus=2  | " required by AirLine and Lightline, without status line does not appear until a window split

  let g:status_sym_start     = ''
  let g:status_sym_end       = ''
  let g:status_sym_sep_start = ''
  let g:status_sym_sep_end   = ''
  let g:symbol_branch        = ''

  if &term == "linux"
    let g:symbol_branch  = ''

    let g:group_active   = "StatusLineTerm"
    let g:group_inactive = "StatusLineTermNC"
    let g:group_tabline  = "StatusLineTerm"
  else
    let g:group_active     = "StatusLine"
    let g:group_inactive   = "StatusLineNC"
    let g:group_tabline    = "TabLine"
  endif

  " this function reverts foreground color and background color of a given
  " highlight group and returns the name of a newly created _invert group
  function! CreateInvertGroup(highlight_group)
    if(synIDattr(hlID(a:highlight_group), "reverse")==1)
      let w:color=synIDattr(hlID(a:highlight_group), "fg#")
    else
      let w:color=synIDattr(hlID(a:highlight_group), "bg#")
    endif

    let l:retval=a:highlight_group.'_invert'
    if(exists('w:color') && w:color == '')
      let w:color = 'NONE'
    endif
    silent! exec 'highlight '.retval.' gui=NONE guifg='.w:color.' cterm=NONE ctermfg='.w:color
    return l:retval
  endfunction

  function! UpdateStatus(highlight_group)
    let l:invert_group = CreateInvertGroup(a:highlight_group)
    let l:mode = get({
          \  'n'      : 'normal',
          \  'i'      : 'insert',
          \  'R'      : 'replace',
          \  'v'      : 'visual',
          \  "V"      : 'visual line',
          \  "\<C-V>" : 'visual block',
          \  'c'      : 'command',
          \  's'      : 'select',
          \  'S'      : 'select line',
          \  "\<C-s>" : 'select block',
          \  't'      : 'terminal'
          \ }, mode(), mode())
    return ''
          \ ."%#StatusLineHighlight#"
          \ ."%#".a:highlight_group."#"
          \ ."%(%w%h%q%)".' '.l:mode.' '
          \ .g:status_sym_sep_start.' '
          \ ."%{(argc()>0\ ?\ argidx()+1.':'.argc().' '.g:status_sym_sep_start.' '\ :\ '')}"
          \ ."%{winbufnr(0).' '.g:status_sym_sep_start}"
          \ ."%{(&readonly\ ?\ '\ \ \ '\ :\ '')}"
          \ ."%{(&modified\ ?\ '\ \ '.nr2char(0xF0C7).'\ '\ :\ '')\ }"
          \ ."%{(haslocaldir() ?\ '  '.fnamemodify(getcwd(),\ ':.').' '.nr2char(0xe0b1)\ \:\ '')}\ "
          \ ."%{(&buftype\ ==\ \"terminal\"\ ?\ has('nvim')?b:term_title:expand(&titlestring)\ :\ substitute(expand('%:p'),\ '^'.getcwd(-1).'/*',\ '',\ ''))\ }"
          \ ."%1(%)"
          \ ."%#".l:invert_group."#"
          \ .g:status_sym_end
          \ .''
          \ ."%="
          \ .''
          \ ."%#".l:invert_group."#"
          \ .g:status_sym_start
          \ ."%#".a:highlight_group."#"
          \ ."%1(%)"
          \ ."%{(&filetype\ !=\ ''\ ?\ &filetype\ :\ &buftype)}"
          \ ."%(\ %{g:status_sym_sep_end}\ %)"
          \ ."%{(&spell\ ?\ &spelllang.' '.g:status_sym_sep_end\ :\ '')}"
          \ ."%{(&fileencoding\ !=\ ''\ ?\ &fileencoding.' '.g:status_sym_sep_end.' '\ :\ '')}"
          \ ."%{(&fileformat\ !=\ ''\ ?\ ' '.&fileformat.' '\ :\ '')}"
          \ .g:status_sym_sep_end.' '
          \ ."%4l:%-3c"
          \ .g:status_sym_sep_end.' '
          \ ."%-3p%%"
  endfunction

  function! UpdateTabline(highlight_group)
    let l:invert_group = CreateInvertGroup(a:highlight_group)
    return ''
          \ ."%#".a:highlight_group."#"
          \ ."%3( \ %)"
          \ ."%{getcwd(-1)}"
          \ .g:status_sym_sep_start.' '
          \ ."%(\ ".g:symbol_branch."\ %{fugitive#head()}\ %)"
          \ ."%#".l:invert_group."#"
          \ .g:status_sym_end
          \ .''
          \ ."%="
          \ .''
          \ ."%#".l:invert_group."#"
          \ .g:status_sym_start
          \ ."%#".a:highlight_group."#"
          \ ."%3(\ %)"
          \ ."%(%{v:servername}\ %{v:this_session}%)"
          \ .g:status_sym_sep_end.' '
          \ ."%(\ \ %{tabpagenr()}/%{tabpagenr('$')}\ %)"
          \ ."%##"
          \ ."" " end
  endfunction

  function! ApplyColorScheme()
    " set termguicolors | " When on, uses highlight-guifg and highlight-guibg attributes in the terminal (=24bit color) incompatible with nvim
    " set t_ut=
    " set up statusline, global and current window individually
    set statusline=%!UpdateStatus(g:group_inactive)
    setlocal statusline=%!UpdateStatus(g:group_active)
    " set up the tabline (match colors)
    set tabline=%!UpdateTabline(g:group_tabline)
  endfunction
  " apply colors from the loaded colorscheme...
  " when changing the colorscheme also apply new colors to the statusbar...
  autocmd VimEnter,ColorScheme  * call ApplyColorScheme()

  autocmd WinEnter    * setlocal statusline=%!UpdateStatus(g:group_active)
  autocmd WinLeave    * setlocal statusline<
augroup END " status

" moved after VimEnter of statusline, so that it does not get overwritten any
" more
if empty(argv())

  " autocmd VimEnter * call setloclist(0, filter(map(copy(v:oldfiles), {_, p->{'filename': expand(get(split(p, "'"), 0))}}), { val -> echo val}))

  " from the list of recent files: make absolute paths, filter out files not
  " contained in cwd and finally filter out directories and non-files...
  autocmd StdinReadPre * let s:std_in=1
  autocmd VimEnter * if !exists("s:std_in") | call setloclist(0, [], 'r',
        \ {
        \   'title':'Recently used files in directory: '.getcwd(),
        \   'items':map(filter(filter(
        \               map(copy(v:oldfiles),
        \                   {_, p->expand(p)}), 'v:val =~ "'.getcwd().'/"'), 'filereadable(v:val)'),
        \               {_, p->{'filename': fnamemodify(p, ':.')}})
        \ }) | lopen | only | setfiletype qf
endif