From c5a11af9259bcb64d8b8d70a45f1df1d28c4c1c5 Mon Sep 17 00:00:00 2001
From: Alisue <lambdalisue@gmail.com>
Date: Wed, 2 Mar 2022 03:36:54 +0900
Subject: [PATCH] Use `syntax/fern.vim` instead to define syntax/highlight

Close #396
---
 autoload/fern/internal/viewer.vim | 19 -------------------
 syntax/fern.vim                   | 28 ++++++++++++++++++++++++++++
 2 files changed, 28 insertions(+), 19 deletions(-)
 create mode 100644 syntax/fern.vim

diff --git a/autoload/fern/internal/viewer.vim b/autoload/fern/internal/viewer.vim
index 6782c4c..f9594cd 100644
--- a/autoload/fern/internal/viewer.vim
+++ b/autoload/fern/internal/viewer.vim
@@ -57,8 +57,6 @@ function! s:init() abort
     autocmd! * <buffer>
     autocmd BufEnter <buffer> setlocal nobuflisted
     autocmd BufReadCmd <buffer> nested call s:BufReadCmd()
-    autocmd Syntax <buffer> call s:Syntax()
-    autocmd ColorScheme <buffer> call s:ColorScheme()
     autocmd CursorMoved,CursorMovedI,BufLeave <buffer> let b:fern_cursor = getcurpos()[1:2]
   augroup END
   call fern#internal#viewer#auto_duplication#init()
@@ -94,9 +92,6 @@ function! s:init() abort
   if !g:fern#disable_viewer_spinner
     call fern#internal#spinner#start()
   endif
-  call helper.fern.renderer.highlight()
-  call fern#hook#emit('viewer:highlight', helper)
-  doautocmd <nomodeline> User FernHighlight
 
   " now the buffer is ready so set filetype to emit FileType
   setlocal filetype=fern
@@ -139,20 +134,6 @@ function! s:BufReadCmd() abort
         \.catch({ e -> fern#logger#error(e) })
 endfunction
 
-function! s:Syntax() abort
-  let helper = fern#helper#new()
-  call helper.fern.renderer.syntax()
-  call fern#hook#emit('viewer:syntax', helper)
-  doautocmd <nomodeline> User FernSyntax
-endfunction
-
-function! s:ColorScheme() abort
-  let helper = fern#helper#new()
-  call helper.fern.renderer.highlight()
-  call fern#hook#emit('viewer:highlight', helper)
-  doautocmd <nomodeline> User FernHighlight
-endfunction
-
 augroup fern_internal_viewer
   autocmd!
   autocmd User FernSyntax :
diff --git a/syntax/fern.vim b/syntax/fern.vim
new file mode 100644
index 0000000..7652979
--- /dev/null
+++ b/syntax/fern.vim
@@ -0,0 +1,28 @@
+if exists('b:current_syntax')
+  finish
+endif
+let b:current_syntax = 'fern'
+
+syntax clear
+
+function! s:ColorScheme() abort
+  let helper = fern#helper#new()
+  call helper.fern.renderer.highlight()
+  call fern#hook#emit('viewer:highlight', helper)
+  doautocmd <nomodeline> User FernHighlight
+endfunction
+
+function! s:Syntax() abort
+  let helper = fern#helper#new()
+  call helper.fern.renderer.syntax()
+  call fern#hook#emit('viewer:syntax', helper)
+  doautocmd <nomodeline> User FernSyntax
+endfunction
+
+augroup fern_syntax_internal
+  autocmd! * <buffer>
+  autocmd ColorScheme <buffer> call s:ColorScheme()
+augroup END
+
+call s:ColorScheme()
+call s:Syntax()