Add HOOKs

Author: lambdalisue

autoload/fern/helper/async.vim

@@ -23,6 +23,7 @@ function! s:async_redraw() abort dict
         \ )
         \})
         \.then({ v -> fern#internal#buffer#replace(helper.bufnr, v) })
+        \.then({ -> fern#hook#emit('viewer:redraw', helper) })
         \.finally({ -> Profile() })
 endfunction
 let s:async.redraw = funcref('s:async_redraw')

autoload/fern/internal/viewer.vim

@@ -105,6 +105,7 @@ endfunction
 function! s:BufReadCmd() abort
   let helper = fern#helper#new()
   call helper.fern.renderer.syntax()
+  call fern#hook#emit('renderer:syntax', helper)
   let root = helper.sync.get_root_node()
   let cursor = get(b:, 'fern_cursor', getcurpos())
   call s:Promise.resolve()
@@ -119,4 +120,5 @@ endfunction
 function! s:ColorScheme() abort
   let helper = fern#helper#new()
   call helper.fern.renderer.highlight()
+  call fern#hook#emit('renderer:highlight', helper)
 endfunction

doc/fern-develop.txt

@@ -15,6 +15,7 @@ RENDERER				|fern-develop-renderer|
 SCHEME					|fern-develop-scheme|
   PROVIDER				|fern-develop-scheme-provider|
   MAPPING				|fern-develop-scheme-provider|
+HOOK					|fern-develop-hook|
 HELPER					|fern-develop-helper|
 LOGGER					|fern-develop-logger|
 UTILITY					|fern-develop-utility|
@@ -500,6 +501,29 @@ Following methods are executed asynchronously and return a promise.
 	It is used to collapse modified nodes to solve issue #103.
 
 
+=============================================================================
+HOOK						*fern-develop-hook*
+
+Following hook will be emitted by |fern#hook#emit()| from fern itself.
+
+"renderer:syntax" ({helper})
+	Called when fern renderer has register its syntax.
+	The {helper} is a helper instance described in |fern-develop-helper|.
+
+"renderer:highlight" ({helper})
+	Called when fern renderer has register its highlight.
+	The {helper} is a helper instance described in |fern-develop-helper|.
+
+"viewer:redraw" ({helper})
+	Called when fern viewer has redrawed.
+	The {helper} is a helper instance described in |fern-develop-helper|.
+
+"viewer:ready" ({helper})
+	Called when fern viewer has ready, mean that the buffer has opened and
+	all content has rendererd.
+	The {helper} is a helper instance described in |fern-develop-helper|.
+
+
 =============================================================================
 LOGGER						*fern-develop-logger*