neovim configuration with vim-airline, gruvbox colors & deoplete C/C++ code completion

init.vim

call plug#begin('~/.config/nvim/plugged')

" Plugins {
  " airline is a better status line and a tab-bar for nvim.
  Plug 'vim-airline/vim-airline'
  Plug 'vim-airline/vim-airline-themes'
  " gruvbox colorscheme. Seems to work the best for me.
  Plug 'morhetz/gruvbox'

  " deoplete - code completion. REQUIRES: :echo has("python3")
  if has('nvim')
    Plug 'Shougo/deoplete.nvim', { 'do': ':UpdateRemotePlugins' }
  else
    Plug 'Shougo/deoplete.nvim'
    Plug 'roxma/nvim-yarp'
    Plug 'roxma/vim-hug-neovim-rpc'
  endif
  " deoplete-clang - code completion for C/C++
  " Plug 'zchee/deoplete-clang'
  "
" }

call plug#end()

if has('autocmd')
  filetype plugin indent on
endif
if has('syntax') && !exists('g:syntax_on')
  syntax enable
endif

" Map the leader key to ,
let mapleader="\<SPACE>"

" General {
  set smarttab

  set noautoindent        " I indent my code myself.
  set nocindent           " I indent my code myself.
  "set smartindent        " Or I let the smartindent take care of it.

  set nrformats-=octal

  set ttimeout
  set ttimeoutlen=100
" }

" Search {
  set ignorecase          " Make searching case insensitive
  set smartcase           " ... unless the query has capital letters.
  set gdefault            " Use 'g' flag by default with :s/foo/bar/.
  set magic               " Use 'magic' patterns (extended regular expressions).

  " Use <C-L> to clear the highlighting of :set hlsearch.
  if maparg('<C-L>', 'n') ==# ''
    nnoremap <silent> <C-L> :nohlsearch<CR><C-L>
  endif
" }

" Formatting {
  set showcmd             " Show (partial) command in status line.
  set showmatch           " Show matching brackets.
  set showmode            " Show current mode.
  set ruler               " Show the line and column numbers of the cursor.
  set number              " Show the line numbers on the left side.
  "set formatoptions+=o    " Continue comment marker in new lines.
  set textwidth=0         " Hard-wrap long lines as you type them. // set this to 80~120 if required
  set expandtab           " Insert spaces when TAB is pressed.
  set tabstop=4           " Render TABs using this many spaces.
  set shiftwidth=4        " Indentation amount for < and > commands.

  set noerrorbells        " No beeps.
  set modeline            " Enable modeline.
  "set esckeys             " Cursor keys in insert mode.
  set linespace=0         " Set line-spacing to minimum.
  set nojoinspaces        " Prevents inserting two spaces after punctuation on a join (J)

  " More natural splits
  set splitbelow          " Horizontal split below current.
  set splitright          " Vertical split to right of current.

  if !&scrolloff
    set scrolloff=3       " Show next 3 lines while scrolling.
  endif
  if !&sidescrolloff
    set sidescrolloff=5   " Show next 5 columns while side-scrolling.
  endif
  set display+=lastline
  set nostartofline       " Do not jump to first character with page commands.

  " Tell Vim which characters to show for expanded TABs,
  " trailing whitespace, and end-of-lines. VERY useful!
  if &listchars ==# 'eol:$'
    set listchars=tab:>\ ,trail:-,extends:>,precedes:<,nbsp:+
  endif
  set list                " Show problematic characters.

  " Also highlight all tabs and trailing whitespace characters.
  highlight ExtraWhitespace ctermbg=darkgreen guibg=darkgreen
  match ExtraWhitespace /\s\+$\|\t/

" }

" Configuration {
  if has('path_extra')
    setglobal tags-=./tags tags^=./tags;
  endif

  set autochdir           " Switch to current file's parent directory.

  " Remove special characters for filename
  set isfname-=:
  set isfname-==
  set isfname-=+

  " Map ; to :
  nnoremap ; :

  if &history < 1000
    set history=1000      " Number of lines in command history.
  endif
  if &tabpagemax < 50
    set tabpagemax=50     " Maximum tab pages.
  endif

  if &undolevels < 200
    set undolevels=200    " Number of undo levels.
  endif

  " Path/file expansion in colon-mode.
  set wildmenu
  set wildmode=list:longest
  set wildchar=<TAB>

  if !empty(&viminfo)
    set viminfo^=!        " Write a viminfo file with registers.
  endif
  set sessionoptions-=options

  set nobackup            " no backup files
  set noswapfile          " no swap files
  set wildignore=*.swp,*.bak,*.pyc,*.class

  " Allow color schemes to do bright colors without forcing bold.
  if &t_Co == 8 && $TERM !~# '^linux'
    set t_Co=16
  endif

  " Remove trailing spaces before saving text files
  " http://vim.wikia.com/wiki/Remove_trailing_spaces
  " ----DISACTIVATED DUE TOO MUCH DIFF GIT DIFFERENCES -----
  "autocmd BufWritePre * :call StripTrailingWhitespace()
  function! StripTrailingWhitespace()
    if !&binary && &filetype != 'diff'
      normal mz
      normal Hmy
      if &filetype == 'mail'
  " Preserve space after e-mail signature separator
        %s/\(^--\)\@<!\s\+$//e
      else
        %s/\s\+$//e
      endif
      normal 'yz<Enter>
      normal `z
    endif
  endfunction

  " Diff options
  set diffopt+=iwhite

  "Enter to go to EOF and backspace to go to start
  nnoremap <CR> G
  nnoremap <BS> gg
  " Stop cursor from jumping over wrapped lines
  nnoremap j gj
  nnoremap k gk
  " Make HOME and END behave like shell
  "inoremap <C-E> <End>
  "inoremap <C-A> <Home>

  " Enable mouse support (move cursor with mouse)
  set mouse=a

  " Python configurations
  let g:python3_host_prog = '/usr/bin/python3'

" }

" UI Options {

  " Colorscheme options.
  set bg=dark
  colorscheme gruvbox

  " Relative numbering
  function! NumberToggle()
    if(&relativenumber == 1)
      set nornu
      set number
    else
      set rnu
    endif
  endfunc

  " Toggle between normal and relative numbering.
  nnoremap <leader>r :call NumberToggle()<cr>

  " Sets a status line. If in a Git repository, shows the current branch.
  " Also shows the current file name, line and column number.
  "if has('statusline')
  "    set laststatus=2

  "    " Broken down into easily includeable segments
  "    set statusline=%<%f\                     " Filename
  "    set statusline+=%w%h%m%r                 " Options
  "    "set statusline+=%{fugitive#statusline()} " Git Hotness
  "    set statusline+=\ [%{&ff}/%Y]            " Filetype
  "    set statusline+=\ [%{getcwd()}]          " Current dir
  "    set statusline+=%=%-14.(%l,%c%V%)\ %p%%  " Right aligned file nav info
  "endif
" }

" Keybindings {
  " Save file
  nnoremap <Leader>w :w<CR>
  "Copy and paste from system clipboard
  vmap <Leader>y "+y
  vmap <Leader>d "+d
  nmap <Leader>p "+p
  nmap <Leader>P "+P
  vmap <Leader>p "+p
  vmap <Leader>P "+P

  " Move between buffers
  nmap <Leader>l :bnext<CR>
  nmap <Leader>h :bprevious<CR>
" }

" Experimental {
  " Search and Replace
  nmap <Leader>s :%s//g<Left><Left>
" }

" Plugin Settings {
  " Airline {
    if !exists('g:airline_symbols')
      let g:airline_symbols = {}
    endif

    let g:airline#extensions#tabline#enabled = 1
    let g:airline#extensions#tabline#buffer_idx_mode = 1
    let g:airline#extensions#tabline#fnamemod = ':t'
    let g:airline#extensions#tabline#left_sep = ''
    let g:airline#extensions#tabline#left_alt_sep = ''
    let g:airline#extensions#tabline#right_sep = ''
    let g:airline#extensions#tabline#right_alt_sep = ''
    let g:airline#extensions#tabline#formatter = 'default'

    " unicode symbols
    let g:airline_left_sep = '»'
    let g:airline_left_sep = '▶'
    let g:airline_right_sep = '«'
    let g:airline_right_sep = '◀'
    let g:airline_symbols.crypt = '🔒'
    let g:airline_symbols.linenr = '␊'
    let g:airline_symbols.linenr = '␤'
    let g:airline_symbols.linenr = '¶'
    let g:airline_symbols.maxlinenr = '☰'
    let g:airline_symbols.maxlinenr = ''
    let g:airline_symbols.branch = '⎇'
    let g:airline_symbols.paste = 'ρ'
    let g:airline_symbols.paste = 'Þ'
    let g:airline_symbols.paste = '∥'
    let g:airline_symbols.spell = 'Ꞩ'
    let g:airline_symbols.notexists = '∄'
    let g:airline_symbols.whitespace = 'Ξ'

    " Theme ( github.com/vim-airline/vim-airline-themes
    let g:airline_theme= 'gruvbox'
  " }
  " CtrlP {
    " Open file menu
    nnoremap <Leader>o :CtrlP<CR>
    " Open buffer menu
    nnoremap <Leader>b :CtrlPBuffer<CR>
    " Open most recently used files
    nnoremap <Leader>f :CtrlPMRUFiles<CR>
  " }
  " deoplete {
  "  " Use deoplete
  "  let g:deoplete#enable_at_startup = 1
  " }
  " deoplete-clang {
  "  " Set default paths [REQURIED]
  "  let g:deoplete#sources#clang#libclang_path = '/usr/lib/llvm-3.8/lib/libclang.so.1'
  "  let g:deoplete#sources#clang#clang_header  = '/usr/lib/clang'
  "  " Some CFLAGS/CPPFLAGS [OPTIONAL]
  "  let g:deoplete#souces#clang#std            = {'c': 'c11', 'cpp': 'c++11', 'objc': 'c11', 'objcpp': 'c++1z'}
  " }
" }

" vim:set ft=vim sw=2 ts=2:

thanks