added ruby formatter, updated readme + minor changes 🐙

README.md

@@ -3,22 +3,27 @@
 A [Neovim](https://neovim.io) plugin for formatting code.
 
 Neoformat uses a variety of formatters for differing filetypes. Currently, Neoformat
-will run a formatter *asynchronously*, and if succeeds it will update the current
+will run a formatter *asynchronously*, and on success it will update the current
 buffer with the formatted text. On a formatter failure, Neoformat will try the next
 formatter defined for the filetype.
 
 The job control is based off of [vim-go's](https://github.com/fatih/vim-go).
 
 ## Current Issues
 
-In order to preserve marks, jumps, etc., Neoformat uses the `setline()` in Vim to
+In order to preserve marks, jumps, etc., Neoformat uses the `setline()` function in Vim to
 input the formatted text. If the buffer is changed before the formatter has completed,
 then the updated text will be put into the current buffer.
 
 So don't switch buffers while formatting!
 
 ## Supported Filetypes
 
-- javascript: [jsbeautify](https://github.com/beautify-web/js-beautify)
-- python: [autopep8](https://github.com/hhatto/autopep8)
-- go: gofmt, goimports
+- javascript
+  - [jsbeautify](https://github.com/beautify-web/js-beautify)
+- python
+  - [autopep8](https://github.com/hhatto/autopep8)
+- go
+  - [gofmt](https://golang.org/cmd/gofmt/), [goimports](https://godoc.org/golang.org/x/tools/cmd/goimports)
+- ruby
+  - [ruby-beautify](https://github.com/erniebrodeur/ruby-beautify)

autoload/neoformat.vim

@@ -143,6 +143,11 @@ endfunction
 
 
 function! g:neoformat#Neoformat(start) abort
+    if !has('nvim')
+        echom 'Neoformat: Neovim is currently required to run this plugin'
+        return
+    endif
+
     " start argument is used for selecting different formatters
     " usually after the first one fails
     if !exists('a:start')
@@ -198,5 +203,3 @@ function! g:neoformat#Neoformat(start) abort
 
     call g:neoformat#NeoformatRun(l:cmd)
 endfunction
-
-

plugin/defaults.vim

@@ -32,3 +32,11 @@ let g:neoformat#go#goimports = {
             \ }
 
 let g:neoformat#enabled#go = ['goimports', 'gofmt']
+
+" Ruby
+let g:neoformat#ruby#rubybeautify = {
+            \ 'exe': 'ruby-beautify',
+            \ 'flags': ['--spaces', '-c 2']
+            \ }
+
+let g:neoformat#enabled#ruby = ['rubybeautify']