Simplifies installation into vim with a plugin (#907)

* Organizes the vim plugin into autoload and plugin

* Updates vim install instructions in readme

Author: robacarp

README.md

@@ -127,9 +127,20 @@ See the [null-ls documentation](https://github.com/jose-elias-alvarez/null-ls.nv
 
 ### Vim
 
-1. Run `cargo build --release`
-2. Add `source /path/to/rubyfmt.vim` to your `~/.vimrc`
-3. Add `let g:rubyfmt_path = /path/to/target/release/rubyfmt-main` beneath the source line
+vim-plug:
+
+```vim
+Plug 'fables-tales/rubyfmt', { 'rtp': 'editor_plugins/vim' }
+```
+
+Native packages:
+
+```sh
+git clone https://github.com/fables-tales/rubyfmt ~/.rubyfmt
+ln -s ~/.rubyfmt/editor_plugins/vim ~/.vim/pack/rubyfmt/start/rubyfmt
+```
+
+Set `g:rubyfmt_path` if `rubyfmt` is not on your `$PATH`.
 
 ### RubyMine (and JetBrains IDEs)
 

editor_plugins/rubyfmt.vim editor_plugins/vim/autoload/rubyfmt.vimeditor_plugins/rubyfmt.vim renamed to editor_plugins/vim/autoload/rubyfmt.vim

@@ -1,8 +1,6 @@
 let s:cpo_save = &cpo
 set cpo&vim
 
-let g:rubyfmt_path = '/Users/penelope/dev/rubyfmt/target/release/rubyfmt-main'
-
 function! rubyfmt#format() abort
   let l:bin_args = [g:rubyfmt_path, '-i']
   let l:curw = winsaveview()
@@ -69,10 +67,5 @@ function! rubyfmt#show_errors(errors) abort
   echom a:errors
 endfunction
 
-if !exists("s:rubyfmt_ac_set")
-  let s:rubyfmt_ac_set=1
-  autocmd FileType ruby autocmd! BufWritePre <buffer> call rubyfmt#format()
-endif
-
 let &cpo = s:cpo_save
 unlet s:cpo_save

editor_plugins/vim/plugin/rubyfmt.vim

@@ -0,0 +1,21 @@
+if exists('g:loaded_rubyfmt')
+  finish
+endif
+let g:loaded_rubyfmt = 1
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+" Path to the rubyfmt binary. Defaults to whatever is on $PATH; override in
+" your vimrc, e.g. let g:rubyfmt_path = '/path/to/target/release/rubyfmt-main'
+if !exists('g:rubyfmt_path')
+  let g:rubyfmt_path = 'rubyfmt'
+endif
+
+if !exists("s:rubyfmt_ac_set")
+  let s:rubyfmt_ac_set=1
+  autocmd FileType ruby autocmd! BufWritePre <buffer> call rubyfmt#format()
+endif
+
+let &cpo = s:cpo_save
+unlet s:cpo_save