Switch to coc for language server support

* Replaces ALE with Coc,
* Adds Solargraph for Ruby, replacing the original rubocop integration,
* Adds JavaScript, HTML, CSS hinting (with eslint and prettier),
* Removes supertab, which is now redundant.

ruby/default-gems

@@ -3,3 +3,4 @@ pry
 rubocop
 rubocop-rails
 rubocop-performance
+solargraph

vim/coc-settings.json

@@ -0,0 +1,7 @@
+{
+  "solargraph.diagnostics": true,
+  "css.validate": false,
+  "less.validate": false,
+  "scss.validate": false,
+  "wxss.validate": false
+}

vimrc

@@ -118,6 +118,24 @@ if executable('ag')
   endif
 endif
 
+""""
+" coc.nvim "
+""""
+" use tab to trigger completion and pick the selected
+inoremap <silent><expr> <TAB>
+      \ pumvisible() ? "\<C-n>" :
+      \ <SID>check_back_space() ? "\<TAB>" :
+      \ coc#refresh()
+inoremap <expr><S-TAB> pumvisible() ? "\<C-p>" : "\<C-h>"
+
+function! s:check_back_space() abort
+  let col = col('.') - 1
+  return !col || getline('.')[col - 1]  =~# '\s'
+endfunction
+
+" format the current file with <leader>p
+nmap <leader>p :CocCommand prettier.formatFile<CR>
+
 """"""""""""""""""""
 " Filetype Plugins "
 """"""""""""""""""""
@@ -140,20 +158,6 @@ augroup vimrcEx
   autocmd BufRead,BufNewFile *.md set filetype=markdown
   autocmd BufRead,BufNewFile .{jscs,jshint,eslint}rc set filetype=json
   autocmd FileType text,markdown,mkd,pandoc call lexical#init()
-
-  " ALE linting events
-  if g:has_async
-    set updatetime=1000
-    let g:ale_lint_on_text_changed = 0
-    autocmd CursorHold * call ale#Queue(0)
-    autocmd CursorHoldI * call ale#Queue(0)
-    autocmd InsertEnter * call ale#Queue(0)
-    autocmd InsertLeave * call ale#Queue(0)
-    let b:ale_fixers = {'javascript': ['prettier', 'eslint']}
-    let g:ale_fix_on_save = 1
-  else
-    echoerr "This requires NeoVim or Vim 8"
-  endif
 augroup END
 
 """"""""""""""""""""""""

vimrc.bundles

@@ -22,24 +22,33 @@ call plug#begin('~/.vim/bundle')
 
 " Define bundles via Github repos
 Plug 'airblade/vim-gitgutter'
+Plug 'bmatcuk/coc-stylelintplus', {'do': 'yarn install --frozen-lockfile'}
 Plug 'bogado/file-line'
+Plug 'chemzqm/vim-jsx-improve'
 Plug 'chriskempson/base16-vim'
 Plug 'ctrlpvim/ctrlp.vim'
 Plug 'elixir-lang/vim-elixir'
 Plug 'elzr/vim-json'
-Plug 'ervandew/supertab'
 Plug 'fatih/vim-go', { 'do': ':GoInstallBinaries' }
 Plug 'hashivim/vim-terraform'
 Plug 'janko-m/vim-test'
 Plug 'jparise/vim-graphql'
 Plug 'keith/swift.vim'
 Plug 'modille/groovy.vim'
-Plug 'mxw/vim-jsx'
+Plug 'neoclide/coc-css', {'do': 'yarn install --frozen-lockfile'}
+Plug 'neoclide/coc-eslint', {'do': 'yarn install --frozen-lockfile'}
+Plug 'neoclide/coc-html', {'do': 'yarn install --frozen-lockfile'}
+Plug 'neoclide/coc-json', {'do': 'yarn install --frozen-lockfile'}
+Plug 'neoclide/coc-prettier', {'do': 'yarn install --frozen-lockfile'}
+Plug 'neoclide/coc-solargraph', {'do': 'yarn install --frozen-lockfile'}
+Plug 'neoclide/coc-tsserver', {'do': 'yarn install --frozen-lockfile'}
+Plug 'neoclide/coc.nvim', { 'branch': 'release' }
 Plug 'pangloss/vim-javascript'
 Plug 'pbrisbin/vim-mkdir'
 Plug 'reedes/vim-lexical'
 Plug 'sbdchd/vim-run'
 Plug 'sebdah/vim-delve'
+Plug 'styled-components/vim-styled-components', { 'branch': 'main' }
 Plug 'tpope/vim-bundler'
 Plug 'tpope/vim-commentary'
 Plug 'tpope/vim-endwise'
@@ -56,8 +65,4 @@ Plug 'vim-pandoc/vim-pandoc'
 Plug 'vim-pandoc/vim-pandoc-syntax'
 Plug 'vim-ruby/vim-ruby'
 
-if g:has_async
-  Plug 'w0rp/ale'
-endif
-
 call plug#end()