"  mikroskeem's neovim config

" Toggle preview
function! s:preview_toggle()
    if &completeopt =~# "preview"
        setlocal completeopt-=preview
        pc
        silent execute "!echo -n Preview turned off"
    else
        setlocal completeopt+=preview
        silent execute "!echo -n Preview turned on"
    endif
endfunction

" Fake $MYVIMRC
function! s:fake_vimrc()
    let $MYVIMRC=$HOME . "/.config/nvim/init.vim"
endfunction

" UpdateRemotePlugins wrapper (used in vim-plug)
function! URP(info)
    if a:info.status == 'installed'
        silent! call s:fake_vimrc()
        silent! UpdateRemotePlugins
    endif
endfunction

" Center text (for vim startify)
function! s:center_header(lines) abort
    let longest_line   = max(map(copy(a:lines), 'len(v:val)'))
    let centered_lines = map(copy(a:lines),
        \ 'repeat(" ", (&columns / 2) - (longest_line / 2)) . v:val')
    return centered_lines
endfunction

" mkdir -p
function! s:mkdir_p(p)
    if !isdirectory(expand(a:p))
        call mkdir(expand(a:p), "p")
    endif
endfunction

" Custom indendations
function! s:set_indent()
    if &ft =~ 'yaml\|coffee\|vim\|jade'
        set softtabstop=4 shiftwidth=4
    endif
    if &ft =~ 'make'
        set shiftwidth=2 tabstop=2 noexpandtab
    endif
endfunction


function! s:read_clangflags()
    return split(join(readfile(getcwd() . "/.clang_complete"), "\n"))
endfunction

" --- Start
if(!has("python3"))
    echo "You should install python neovim module. `pip install neovim`"
    exec "qall"
end


" Plugins
call plug#begin('~/.config/nvim/neostrophic_plugins')
" --- Completion and syntax check engine
Plug 'Shougo/deoplete.nvim', {'do': function('URP')}
Plug 'neomake/neomake'
Plug 'ervandew/supertab'
Plug 'Shougo/echodoc.vim'

" --- Syntax and completion engine components

Plug 'Shougo/context_filetype.vim'
Plug 'Shougo/unite.vim'
Plug 'Shougo/vimproc.vim', {'do' : 'make'}

" C++
Plug 'Rip-Rip/clang_complete', {'for': ['c', 'cpp']}
Plug 'octol/vim-cpp-enhanced-highlight'

" Python
Plug 'zchee/deoplete-jedi', {'for': 'python'}
Plug 'jmcantrell/vim-virtualenv'

" Vimscript
Plug 'Shougo/neco-vim', {'for': 'vim'}
Plug 'Shougo/neco-syntax', {'for': 'vim'}

" JSON
Plug 'elzr/vim-json', {'for': 'json'}

" Java
"Plug 'artur-shaik/vim-javacomplete2', {'for': 'java'}

" Markdown
Plug 'gabrielelana/vim-markdown'

" Misc
Plug 'vim-scripts/nginx.vim', {'for': 'nginx'}
Plug 'Matt-Deacalion/vim-systemd-syntax', {'for': 'systemd'}
Plug 'PotatoesMaster/i3-vim-syntax', {'for': 'i3'}

" --- Git
Plug 'airblade/vim-gitgutter'
Plug 'tpope/vim-fugitive'


" --- Themes
"Plug 'crater2150/vim-theme-chroma'
Plug 'justinmk/molokai'

" --- Workflow

" Startup screen
Plug 'mhinz/vim-startify'

" Remove trailing whitespace
Plug 'thirtythreeforty/lessspace.vim'

" Automatic pathenses
Plug 'jiangmiao/auto-pairs'

" Undo tree
Plug 'sjl/gundo.vim'

" Status line
Plug 'itchyny/lightline.vim'

" Pathenses
Plug 'luochen1990/rainbow'

" Indendation aids
Plug 'Yggdroot/indentLine'
Plug 'godlygeek/tabular'

" Distraction-free
Plug 'junegunn/goyo.vim', {'on': 'Goyo'}
Plug 'junegunn/limelight.vim', {'on': 'Limelight'}

call plug#end()

" Apply color scheme
colorscheme molokai

" --- Neovim options
set updatetime=250
set wildmode=longest,list,full
set shortmess+=cI
set noshowmode
set nostartofline
set wrap
set textwidth=0
set wrapmargin=0

" Our leader is comma
let mapleader = ","

" Show line numbers
set number
set numberwidth=3

" Disable preview by default, because it is annoying imo
set completeopt-=preview

" Use X11 clipboard and set up other display related settings
if $DISPLAY != ''
  set clipboard+=unnamedplus
  set mouse+=a
endif

" Search options
set showmatch
set smartcase
set ignorecase

" Backup, undo and viminfo
set backup
set undofile
set undoreload=100
set viminfo+=n$HOME/.config/nvim/tmp/viminfo
set backupdir=$HOME/.config/nvim/tmp/backup/
set undodir=$HOME/.config/nvim/tmp/undo/
set directory=$HOME/.config/nvim/tmp/swap/

" Create missing directories
silent! call s:mkdir_p(&undodir)
silent! call s:mkdir_p(&backupdir)
silent! call s:mkdir_p(&directory)

set title
set cursorline
set showtabline=0

" Terminal tweaks
function! s:on_terminal_open()
    setlocal nocursorline
endfunction
autocmd TermOpen * nested call <SID>on_terminal_open()

" Default indendation settings
set softtabstop=4
set shiftwidth=4
set expandtab
set shiftround
set autoindent
set copyindent
" Function call below overrides previous options
" if opened filetype was defined in function
autocmd! FileType * call s:set_indent()

" Neovim python
" Note: Read https://github.com/zchee/deoplete-jedi#virtual-environments
let g:python_host_prog  = '/usr/bin/python2'
let g:python3_host_prog  = '/usr/bin/python3'

" --- Plugin configurations

" Deoplete and echodoc
let g:deoplete#enable_at_startup = 1
let g:deoplete#enable_camel_case = 1
let g:echodoc_enable_at_startup = 1

" Rainbow
let g:rainbow_active = 1
let g:rainbow_conf = {'ctermfgs': ['red', 'lightgreen', 'lightred', 'lightblue', 'yellow']}

" Gitgutter
let g:gitgutter_map_keys = 0
let g:gitgutter_highlight_lines = 0

" indentLine
let g:indentLine_char = '┆'

" Startify
let g:startify_session_dir = '~/.config/nvim/startify-session'
let g:startify_custom_header = s:center_header(map(split(system('fortune | cowsay'), '\n'), '"   ". v:val') + ['',''])

" Neomake
let g:neomake_makeclean_maker = { 'exe': 'make', 'args': ['clean'] }
autocmd! BufReadPost * Neomake
autocmd! BufWritePost * Neomake

" Lightline
let g:lightline_buffer_readonly_icon = 'R'
let g:lightline_buffer_modified_icon = '+'
let g:lightline_buffer_active_buffer_left_icon = '['
let g:lightline_buffer_active_buffer_right_icon = ']'
let g:lightline_buffer_separator_icon = ''

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

let g:lightline = {
    \ 'active': {
        \ 'left': [['mode', 'paste'], ['filename', 'readonly', 'modified', 'fugitive']],
    \ },
    \ 'component_function': {
        \ 'fugitive': 'LlFugitive',
    \ },
        \ 'separator': { 'left': '>', 'right': '<' },
        \ 'subseparator': { 'left': '>', 'right': '<' }
    \ }
function! LlFugitive()
    return exists('*fugitive#head') ? fugitive#head() : ''
endfunction

" Goyo & Lightline
function! s:on_goyo_enter()
    setlocal nocursorline
    Limelight
endfunction

function! s:on_goyo_leave()
    setlocal cursorline
    Limelight!
endfunction
autocmd! User GoyoEnter nested call <SID>on_goyo_enter()
autocmd! User GoyoLeave nested call <SID>on_goyo_leave()

" Markdown
let g:markdown_include_jekyll_support = 0

" Own Unite menu
" Thanks to: http://vi.stackexchange.com/a/591

if !exists('g:unite_source_menu_menus')
    let g:unite_source_menu_menus = {}
endif
let g:unite_source_menu_menus.neostrophic_menu = {'description': 'Neostrophic menu'}

function! g:unite_source_menu_menus.neostrophic_menu.map(key, value)
    return {
    \   'word': a:key,
    \   'kind': 'command',
    \   'action__command': a:value
    \ }
endfunction

let g:unite_source_menu_menus.neostrophic_menu.command_candidates = [
\   ['▷ Neomake: make clean                                         <none>', 'Neomake! makeclean'],
\   ['▷ Neostrophic: grep for TODOs                                 <none>', 'grep TODO'],
\   ['▷ Git: preview hunk                                              ,hp', 'GitGutterPreviewHunk'],
\   ['▷ Git: stage hunk                                             <none>', 'GitGutterStageHunk'],
\   ['▷ Git: undo hunk                                                 ,hr', 'GitGutterUndoHunk'],
\   ['▷ Git: move to next changed hunk                              <none>', 'GitGutterNextHunk'],
\   ['▷ Git: move to previous changed hunk                             ,hr', 'GitGutterPrevHunk'],
\   ['▷ Git: blame                                                  <none>', 'Gblame'],
\   ['▷ Git: pull                                                   <none>', 'Gpull'],
\   ['▷ Git: diff                                                   <none>', 'Gdiff'],
\   ['▷ Git: status                                                 <none>', 'Gstatus'],
\   ['▷ Undo: show tree                                                 F6', 'GundoToggle'],
\   ['▷ Goyo: toggle                                                    F8', 'Goyo'],
\]

nnoremap <Leader>m :Unite menu:neostrophic_menu -start-insert -ignorecase<CR>

" SuperTab
let g:SuperTabDefaultCompletionType = "<c-n>"

" LessSpace
let g:lessspace_blacklist = ['markdown']

" Neomake
let s:default_clang_args = ['-std=c++14', '-fsyntax-only', '-Wall', '-Wextra']
let g:neomake_cpp_clang_maker = {
    \'args': s:default_clang_args
    \ }
let g:neomake_cpp_enabled_makers = ['clang']

function! s:build_clang_args()
    if filereadable(getcwd() . "/.clang_complete")
        " Read flags
        let newflags = s:default_clang_args + s:read_clangflags()
        " Build list with no duplicates for sure
        let g:neomake_cpp_clang_maker.args = filter(copy(newflags), 'index(newflags, v:val, v:key+1)==-1')
    endif
endfunction
autocmd! FileType cpp nested call s:build_clang_args()


" --- Keymaps
" Commonly used commands
nnoremap <silent> <C-z> :u<CR>
nnoremap <silent> <C-o> :w<CR>
nnoremap <silent> <C-x> :q<CR>
nnoremap <silent> <C-A-x> :q!<CR>
nnoremap <silent> <C-A-a> :noh<CR>
nnoremap <silent> <Leader>p :call <SID>preview_toggle()<CR>

" F-line
nnoremap <F5> :so %<CR>
nnoremap <F6> :GundoToggle<CR>
nnoremap <F7> :term<CR>
nnoremap <F8> :Goyo<CR>

" Git
nmap <Leader>hr <Plug>GitGutterUndoHunk
nmap <Leader>hp <Plug>GitGutterPreviewHunk

" Shut up annoying stuff
nnoremap <silent> <C-A-f> :SyntasticToggleMode<CR>
nnoremap <silent> <Leader>p :call <SID>preview_toggle()<CR>

" Increase/decrease numbers with Alt key and A/X
nnoremap <A-a> <C-a>
nnoremap <A-x> <C-x>

" Terminal
tnoremap <A-q> <C-\><C-n>