Merge pull request #194 from lambdalisue/mark-children-pre

Add "get_child_nodes" on helper.async

autoload/fern/helper/async.vim

@@ -40,6 +40,25 @@ function! s:async_remark() abort dict
 endfunction
 let s:async.remark = funcref('s:async_remark')
 
+function! s:async_get_child_nodes(key) abort dict
+  let helper = self.helper
+  let fern = helper.fern
+  let node = fern#internal#node#find(a:key, fern.nodes)
+  if empty(node)
+    return s:Promise.reject(printf('failed to find a node %s', a:key))
+  endif
+  let Profile = fern#profile#start('fern#helper:helper.async.get_child_nodes')
+  return s:Promise.resolve()
+        \.then({ -> fern#internal#node#children(
+        \   node,
+        \   fern.provider,
+        \   fern.source.token,
+        \ )
+        \})
+        \.finally({ -> Profile() })
+endfunction
+let s:async.get_child_nodes = funcref('s:async_get_child_nodes')
+
 function! s:async_set_mark(key, value) abort dict
   let helper = self.helper
   let fern = helper.fern

doc/fern-develop.txt

@@ -445,6 +445,10 @@ Following methods are executed asynchronously and return a promise.
 .async.remark()
 	Return a promise to remark the content.
 
+			*fern-develop-helper.async.get_child_nodes()*
+.async.get_child_nodes({key})
+	Return a promise which will resolves to child nodes of the {key} node.
+
 			*fern-develop-helper.async.set_mark()*
 .async.set_mark({key}, {value})
 	Return a promise to set mark to a node identified by the {key}.

test/fern/helper.vimspec

@@ -38,6 +38,7 @@ Describe fern#helper
           \ 'sleep',
           \ 'redraw',
           \ 'remark',
+          \ 'get_child_nodes',
           \ 'set_mark',
           \ 'set_hidden',
           \ 'set_include',