My init.vim file

init.vim

" Set 'nocompatible' to ward off unexpected things that your distro might
" have made, as well as sanely reset options when re-sourcing .vimrc
set nocompatible

" Install plugins with vim-plug https://github.com/junegunn/vim-plug
" Reload and runs :PlugInstall to install plugins

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

Plug 'scrooloose/nerdtree', { 'on': 'NERDTreeToggle' }
Plug 'tomtom/tcomment_vim'
Plug 'mileszs/ack.vim'
Plug 'lifepillar/vim-solarized8'
Plug 'whatyouhide/vim-gotham'
Plug 'slim-template/vim-slim'
Plug 'ctrlpvim/ctrlp.vim'
Plug 'tpope/vim-fugitive'
Plug 'ervandew/supertab'
Plug 'tpope/vim-rails'
Plug 'janko/vim-test'
Plug 'vim-airline/vim-airline'
Plug 'Rigellute/shades-of-purple.vim'

call plug#end()

" Use The Silver Searcher if available
" https://github.com/ggreer/the_silver_searcher
if executable('ag')
  let g:ackprg = 'ag --vimgrep'
  cnoreabbrev ag Ack
  cnoreabbrev aG Ack
  cnoreabbrev Ag Ack
  cnoreabbrev AG Ack
endif

" -- Configurations --

" Enable syntax highlighting
syntax on

" Don't wrap long lines
set nowrap

" Use 2 spaces for tabs
set expandtab
set tabstop=2
set softtabstop=2
set shiftwidth=2
set smarttab
set mouse=a
set clipboard+=unnamedplus
set termguicolors

" Automatically remove all trailing whitespace
autocmd BufWritePre * %s/\s\+$//e

" Set default colorscheme to solarized
set background=dark
silent! colorscheme shades_of_purple
let g:shades_of_purple_airline = 1
let g:airline_theme='shades_of_purple'

" Enable line numbers and don't make them any wider than necessary
set number numberwidth=2

" -- Mappings --

" Toggle NERDTreeToggle
nmap <C-Space> :NERDTreeToggle<CR>

" Switch between panes
nmap <C-J> <C-W>j
nmap <C-K> <C-W>k
nmap <C-H> <C-W>h
nmap <C-L> <C-W>l

" these "Ctrl mappings" work well when Caps Lock is mapped to Ctrl
nmap <silent> <Leader>n :TestNearest<CR>
nmap <silent> <Leader>f :TestFile<CR>
nmap <silent> <Leader>s :TestSuite<CR>
nmap <silent> t<C-l> :TestLast<CR>
nmap <silent> t<C-g> :TestVisit<CR>

" Mapping CtrlP command
nnoremap <C-b> :<C-U>CtrlPBuffer<CR>
nnoremap <Leader>t :<C-U>CtrlP<CR>

" Custom ignore folders for CtrlP
let g:ctrlp_custom_ignore = {
    \ 'dir': '\.git\|dist\|node_modules$'
\ }

" Custom configure rspec
let test#ruby#rspec#executable = 'bundle exec rspec'