Raise custom event - fixes #37, #19

Author: raghur

README.adoc

@@ -16,6 +16,23 @@ Plug 'raghur/vim-ghost', {'do': ':GhostInstall'}
 . On any textarea, click the ghost icon - switch to neovim and edit!. Content is sync'ed real time. Works both ways - edits in the browser window are pushed to neovim as well.
 . When done, just delete the buffer with `:bd!` - you'll be disconnected
 
+== Configuring filetype
+Whenever a buffer is connected, a `User` event `vim-ghost#connected` is raised. Here's a quick sample of 
+setting filetype to `markdown` if the textarea was on github or reddit
+
+```
+function! s:SetupGhostBuffer()
+    if match(expand("%:a"), '\v/ghost-(github|reddit)\.com-')
+        set ft=markdown
+    endif
+endfunction
+
+augroup vim-ghost
+    au!
+    au User vim-ghost#connected call s:SetupGhostBuffer()
+augroup END
+```
+
 == Requirements
 
 * Recent neovim/vim

rplugin/python3/ghost.py

@@ -236,6 +236,8 @@ def _handle_on_message(self, req, websocket):
                 buffer_handler_map[websocket] = [bufnr, temp_file_handle]
                 self.nvim.command(delete_cmd)
                 logger.debug("Set up aucmd: %s", delete_cmd)
+                self.nvim.command("doauto User vim-ghost#connected")
+                logger.debug("Raised custom au event")
                 self._raise_window()
             change_cmd = ("au TextChanged,TextChangedI <buffer> call"
                           " GhostNotify('text_changed', %d)" % bufnr)