set nocompatible
if &shell =~# 'fish$'
    set shell=sh
endif

" Allow backspacing over everything in insert mode.
set backspace=indent,eol,start
set number
set relativenumber
"[Hide/show the white-space and more invisible symbols]"
set list
set listchars=tab:▸\ ,nbsp:¬,trail:-
"             |       |      + Trailing spaces
"             |       + Non breakable spaces
"             + Tabulations: `tab xy`, x: first char, y: following chars
set nojoinspaces
"[Indent & Tab/mode-line settings]"
set breakindent
set nopaste
set smarttab
set tabstop=4 " tabs size on screen "
set expandtab " <tab> inserts spaces "
set autoindent
set copyindent " copy existing tab/spaces mix on newline "
set smartindent " overruled by cindent "
set cinwords=except,finally,def,class,with,do,if,elif,else,for,while,try,switch
set cinoptions+=l1 " switch case label alignement, :h cinoptions-values "
set shiftwidth=4 " number of space to use on indent. Use tabstop if 0"
"set softtabstop=4
"[Matching chars]"
set showmatch
set matchpairs=\":\"
set matchpairs+=(:)
set matchpairs+={:}
set matchpairs+=[:]
"[TextWidth settings]"
set textwidth=0
"[Look for a single modeline in files]"
set modeline
set modelines=1

set ruler		" show the cursor position all the time
set showcmd		" display incomplete commands
set laststatus=2
set noshowmode

"[Command mode autocompletion]"
set wildmenu
set wildmode=longest:full,full
"            `------------|---- First complete till longest common string, open wildmenu
"                         `---- Then, complete next full match

set ttimeout		" time out for key codes
set ttimeoutlen=100	" wait up to 100ms after Esc for special key

"[Turn backup off and value of history]"
set nobackup
set noswapfile
set history=1000
set nowritebackup
set undolevels=5000

"[Setup history file]"
set viminfo=%,<0,'10,/16,:16,h,f0
"           | |  |   |   |   | + file marks 0-9,A-Z 0=NOT stored
"           | |  |   |   |   + disable 'hlsearch' loading viminfo
"           | |  |   |   + command-line history saved
"           | |  |   + search history saved
"           | |  + files marks saved
"           | + lines saved each register (old name for <, vi6.2): NOT STORED
"           + save/restore buffer list
if !has('nvim')
    "[Declutter $HOME]"
    set viminfo+=n~/.vim/cache/.viminfo
endif

" Show @@@ in the last line if it is truncated.
set display=truncate
"[Splitting rules]"
set splitbelow
set splitright
set equalalways

" Show a few lines of context around the cursor.
set scrolloff=5
" Try to keep the cursor in the same column while scrolling
set nostartofline

set autochdir
set autoread
set autowrite

"[Shared with OS clipboard]"
set clipboard=unnamed

"[For regular expressions turn magic on, use \v to get regex parent]"
set magic
"[Search settings]"
set hlsearch
set incsearch
set smartcase
set ignorecase
set wrapscan
"[When on, the ":substitute" flag 'g' is default on]"
set nogdefault
"[Enable realtime feedback for substitution]"
if has("nvim")
    set inccommand=nosplit
endif


"[Kitty doesn't support background color erase]"
let &t_ut=''
let base16colorspace=256
set background=dark
colorscheme base16-default-dark
"[Fix background transparency]"
if has("autocmd")
    autocmd ColorScheme * highlight Normal ctermbg=None
    autocmd ColorScheme * highlight NonText ctermbg=None
endif


"[Define the leader key]"
let mapleader=","
let maplocalleader=","
"[Reselect visual block after indent/outdent]"
vnoremap < <gv
vnoremap > >gv
"[Improve up/down movement on wrapped lines]"
"[If preceded by a count, jump actual lines. Also if > 5, save to jumplist]"
nnoremap <expr> j v:count ? (v:count > 5 ? "m'" . v:count : '') . 'j' : 'gj'
nnoremap <expr> k v:count ? (v:count > 5 ? "m'" . v:count : '') . 'k' : 'gk'
"[Easy split navigation]"
nnoremap <C-j> <C-W>j
nnoremap <C-k> <C-W>k
nnoremap <C-h> <C-W>h
nnoremap <C-l> <C-W>l
nnoremap <C-Up> <C-W>k
nnoremap <C-Down> <C-W>j
nnoremap <C-Left> <C-W>h
nnoremap <C-Right> <C-W>l
"[Locate the desired objects in the center of the screen]"
nnoremap <silent> n nzz
nnoremap <silent> N Nzz
nnoremap <silent> * *zz
nnoremap <silent> # #zz
"[New line under/bellow current line without jump to insert-mode]"
nnoremap <leader>o o<Esc>
nnoremap <leader>O O<Esc>
"[Clear search highlights]"
nnoremap // :nohlsearch<CR>
"[Reflow current paragraph]"
"[http://stevelosh.com/blog/2010/09/coming-home-to-vim/]"
nnoremap <silent> <leader>q :call ReflowParagraph()<CR>
" http://stackoverflow.com/questions/1005/getting-root-permissions-on-a-file-inside-of-vi
cmap w!! w !sudo tee >/dev/null %
"[To disable the arrow keys]"
for prefix in ['i', 'n', 'v']
    for key in ['<Up>', '<Down>', '<Left>', '<Right>']
        execute prefix . "noremap " . key . " <Nop>"
    endfor
endfor
"[Switch quickly between source and header]"
nnoremap <leader>f :e <C-r>=SwapExtension()<CR><CR>



" Do incremental searching when it's possible to timeout.
if has('reltime')
    set incsearch
endif

" LaTeX ftdetect
let g:tex_flavor = "latex"

" Switch syntax highlighting on when the terminal has colors or when using the
" GUI (which always has colors).
if &t_Co > 2 || has("gui_running")
    " Revert with ":syntax off".
    syntax on

    " I like highlighting strings inside C comments.
    " Revert with ":unlet c_comment_strings".
    let c_comment_strings=1
endif

"[Reflow current paragraph]"
function! ReflowParagraph()
    let l:view = winsaveview()
    normal gwip
    call winrestview(l:view)
endfunction
"[Remove tabs and spaces at the end of lines]"
function! DeleteTrailingTWS()
    "[Do not clean up trailing spaces in binary mode or in diff files]"
    if &binary || &ft =~ 'diff'
        return
    endif
    let l:view = winsaveview()
    silent %s/[ \t]*$//g
    silent %s/\s\+$//ge
    call winrestview(l:view)
endfunction
"[Make the scripts executable]"
function! ChangeScriptMode()
    if getline(1) =~ "#!"
        if getline(1) =~ "bin/"
            silent !chmod +x <afile>
        endif
    endif
endfunction
"[Swap file extensions, for example cpp/h]"
"https://stackoverflow.com/a/22145246"
function! SwapExtension()
    let [rest, ext] = [expand('%:r'), expand('%:e')]
    if ext ==? 'h'
        if filereadable(rest . '.c')
            let ext = 'c'
        elseif filereadable(rest . '.cpp')
            let ext = 'cpp'
        endif
    elseif ext ==? 'cpp' || ext ==? 'c'
        let ext = 'h'
    "swap between vertex and fragment shader"
    elseif ext ==? 'vsh'
        let ext = 'fsh'
    elseif ext ==? 'fsh'
        let ext = 'vsh'
    endif
    return rest . '.' . ext
endfunction

" Only do this part when compiled with support for autocommands.
if has("autocmd")

    " Enable file type detection. Use the default filetype settings, so that
    " mail gets 'tw' set to 72, 'cindent' is on in C files, etc. Also load
    " indent files, to automatically do language-dependent indenting.
    " Revert with ":filetype off".
    filetype plugin indent on

    " Put these in an autocmd group, so that you can revert them with:
    " ":augroup vimStartup | au! | augroup END"
    augroup vimStartup
        au!

        " When editing a file, always jump to the last known cursor position.
        " Don't do it when the position is invalid, when inside an event handler
        " (happens when dropping a file on gvim) and for a commit message (it's
        " likely a different one than last time).
        autocmd BufReadPost *
            \ if line("'\"") >= 1 && line("'\"") <= line("$") && &ft !~# 'commit' |
                \ exe "normal! g`\"" |
            \ endif

    augroup END

    "[Try not to pollute the undo tree (https://vi.stackexchange.com/a/13401)]"
    autocmd BufWritePre *
        \ try |
            \ undojoin |
        \ catch /^Vim\%((\a\+)\)\=:E790/ |
        \ finally |
            \ call DeleteTrailingTWS() |
        \ endtry

    if has("unix") || has("mac")
        autocmd BufWritePost * call ChangeScriptMode()
    endif

endif " has("autocmd")