"=======================================================================================================================
" GENERAL
"=======================================================================================================================

filetype on
filetype plugin on
filetype indent on

syntax on                                 | " enable syntax highlighting
syntax sync minlines=60                   | " how many preceding lines will be parsed? (high performance impact)

set secure                                | " to ensure, that modelines do not contain executable code
set noexrc                                | " exrc was nice, but has too many security problems. Now using editorconfig instead (see plugins)
set modeline                              | " set variables specific to a file, like indentation by adding a comment (TODO: should probably be replaced by editorconfig)
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                  | " 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 hlsearch incsearch                    | " highlight pattern while entering it (performance wise this isn't that good)


"=======================================================================================================================
" BASIC CODE STYLE
"=======================================================================================================================
" set cindent cinoptions+=(0              | " indents at the level of parentheses -- if desired
set expandtab                             | " replace tabs with spaces
set textwidth=0                           | " should be set file type specific, colorcolumns is there to assist anyways
set tabstop=4
set shiftwidth=4
set softtabstop=4


" ======================================================================================================================
"  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

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

if exists("g:neovide")
  set guifont=monospace:h11:b
  let g:neovide_cursor_animation_length=0
  let g:neovide_scroll_animation_length = 0.5
  let g:neovide_cursor_trail_size=0.8
  let g:neovide_cursor_vfx_mode = ""
  let g:neovide_transparency = 0.9
  let g:neovide_floating_blur_amount_x = 4.0
  let g:neovide_floating_blur_amount_y = 4.0
  let g:neovide_background_color = '#383a62'
  let g:neovide_scale_factor = 1.0
endif

set pumheight=8               | " Determines the maximum number of items to show in the pop-up menu for
set scrolljump=4              | " how many lines get scrolled into view when cursor reaches the screens edge
set scrolloff=4               | " 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, but causes problems with solid backgrounds)
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 isfname-==                | " remove = as char in filenames, because most FSs do not support it
set complete+=d               | " scan current and included files for defined name or macro
set complete+=i               | " scan current and included files for completions
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 completeopt+=noinsert     | " Do not insert any text for a match until the user selects one
set completeopt+=noselect     | " Do not select a completion from the menu, let the user do that
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=0              | " 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=printf('%*s%.*S',indent(v:foldstart),'',&textwidth-indent(v:foldstart),substitute(substitute(join(getline(v:foldstart,v:foldend),'\ '),'[[:space:]*/]\\+','\ ','g'),'^[[:space:]*]','','g'))
set foldtext=repeat('\ ',indent(v:foldstart)-1).join(getline(v:foldstart,v:foldend))[:winwidth(0)]->substitute('[[: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}))

" 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)


"=======================================================================================================================
" PATH -- where to search for includes (e.g. `gf` or `:find`)
"=======================================================================================================================
set path+=**4                             | " allow recursive searches for files (limit depth by 4) 
if executable("uname") " does not work under Windows
  let &path = &path.",/usr/lib/modules/".substitute(system('uname -r'), "\n", "", "")."/build/include"
endif


"=======================================================================================================================
" 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


"=======================================================================================================================
" UNDO:
" Persistent undo behaviour, also keeps undo history between starts
"=======================================================================================================================
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


"=======================================================================================================================
" DISPLAY & 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)
  set termencoding=utf-8      | " we just assume that this is supported.

  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 list&

  autocmd InsertEnter *  set colorcolumn=80,120
  autocmd InsertLeave *  set colorcolumn&
  " set fillchars+=stlnc:\―       | "
end


"=======================================================================================================================
" AUTOCMDs and FileType specific stuff
"=======================================================================================================================
if has("autocmd")
  " use the shada/viminfo file to return the cursor to where it was...
  autocmd BufWinEnter        *  if &previewwindow | setlocal nonumber nolist signcolumn=no filetype=c nobuflisted | endif

  " Workaround: Allows Vim to yank text within wayland
  " XDG_SESSION_TYPE is only set if a login manager was used
  " WAYLAND_DISPLAY should always work
  " if ($XDG_SESSION_TYPE ==# 'wayland' || ! empty($WAYLAND_DISPLAY)) && !has('nvim')
  "  autocmd TextYankPost       * call system("wl-copy", getreg('+'))
  " endif 

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


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


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

    " let g:loaded_ruby_provider                   = 1 " disable ruby support
    " let g:loaded_python_provider                 = 1 " disable python 3

    let g:LatexBox_latexmk_preview_continuously  = 1
    let g:LatexBox_viewer                        = "evince"

    autocmd FileType python               setlocal keywordprg=pydoc
    autocmd FileType vim                  setlocal keywordprg=:help |.
    autocmd FileType conf                 setlocal isfname-==
    autocmd Filetype css                  command! CSSsort :g/{/+1;/}/-1 sort
    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
endif

" ======================================================================================================================
augroup CUSTOM_COMMANDS
  command! Qfls call setqflist([],'r',{ 'title':'listed buffers', 'items':map(getbufinfo({"buflisted":1}), '{"bufnr":get(v:val,"bufnr"),"lnum":get(v:val,"lnum"),"module":printf("%-*s",winwidth(0)-4,fnamemodify(get(v:val,"name"),":t"))}') })
  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
  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>")
  command! FindInAllBuffers  cex [] | bufdo vimgrepadd //g % | cw
augroup END

"=======================================================================================================================
augroup KEYBOARD_MAPPING
  " 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>

  nnoremap <F4>          :wincmd c<CR>
  nnoremap <F5>          :make!<CR>
  nnoremap <F6>          :silent syntax sync fromstart<CR>:nohlsearch<CR>:silent match<CR>:silent 2match<CR>:silent 3match<CR>
  nnoremap <F7>          :Ltoggle<CR>
  nnoremap <F8>          :Ctoggle<CR>
  nnoremap <F9>          :TagbarToggle<CR>
  "" remap <..>
  nnoremap <F12>         :Qfls<CR>:Ctoggle<CR>

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


  inoremap <C-S>               <C-O>:w<CR>

  " exec current line as a command, insert output of command (from: https://youtu.be/MquaityA1SM?t=35m45s)
  nnoremap <leader>Q     !!$SHELL<CR>
  " google the word under the cursor
  nnoremap <leader>g     :execute ":!xdg-open https://google.de/search?q=".expand("<cword>")<CR>
  nnoremap <leader>u     :execute ":!xdg-open ".expand("<cWORD>")<CR>
  " display highlight group under the cursor
  nnoremap <leader>h     :echo map(synstack(line('.'), col('.')), 'synIDattr(v:val, "name")')<CR>


  " ======================================================================================================================
  " 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

  " if the wildmenu is configured to to display suggestions vertically, then
  " reconfigure the cursor keys to work in that direction
  if &wildoptions =~# 'pum'
    cnoremap <expr> <up>   pumvisible() ? "<C-p>" : "\<up>"
    cnoremap <expr> <down> pumvisible() ? "<C-n>" : "\<down>"
  endif


  " 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>+

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

"=======================================================================================================================
" v modeline, do not chnage v
" vim: noai:ts=2:sw=2:sts=2 iskeyword+=\:,\<,\>,\-,\& number