feat(filesystem): open in right below or left above split (#1294)

doc/neo-tree.txt

@@ -232,6 +232,12 @@ S             = open_split:  Same as open, but opens in a new horizontal split.
 
 s             = open_vsplit: Same as open, but opens in a vertical split.
 
+         open_rightbelow_vs: Same as open_vsplit, but opens in a right window
+                             of the vertical split.
+
+          open_leftabove_vs: Same as open_vsplit, but opens in a left window
+                             of the vertical split.
+
 t             = open_tabnew: Same as open, but opens in a new tab.
 
                   open_drop: Same as open, but opens with the |:drop| command. 

lua/neo-tree/defaults.lua

@@ -372,6 +372,8 @@ local config = {
       ["S"] = "open_split",
       -- ["S"] = "split_with_window_picker",
       ["s"] = "open_vsplit",
+      -- ["sr"] = "open_rightbelow_vs",
+      -- ["sl"] = "open_leftabove_vs",
       -- ["s"] = "vsplit_with_window_picker",
       ["t"] = "open_tabnew",
       -- ["<cr>"] = "open_drop",

lua/neo-tree/sources/common/commands.lua

@@ -776,6 +776,22 @@ M.open_vsplit = function(state, toggle_directory)
   open_with_cmd(state, "vsplit", toggle_directory)
 end
 
+---Open file or directory in a right below vertical split of the closest window
+---@param state table The state of the source
+---@param toggle_directory function The function to call to toggle a directory
+---open/closed
+M.open_rightbelow_vs = function(state, toggle_directory)
+  open_with_cmd(state, "rightbelow vs", toggle_directory)
+end
+
+---Open file or directory in a left above vertical split of the closest window
+---@param state table The state of the source
+---@param toggle_directory function The function to call to toggle a directory
+---open/closed
+M.open_leftabove_vs = function(state, toggle_directory)
+  open_with_cmd(state, "leftabove vs", toggle_directory)
+end
+
 ---Open file or directory in a new tab
 ---@param state table The state of the source
 ---@param toggle_directory function The function to call to toggle a directory

lua/neo-tree/sources/filesystem/commands.lua

@@ -186,6 +186,12 @@ end
 M.open_split = function(state)
   cc.open_split(state, utils.wrap(fs.toggle_directory, state))
 end
+M.open_rightbelow_vs = function(state)
+  cc.open_rightbelow_vs(state, utils.wrap(fs.toggle_directory, state))
+end
+M.open_leftabove_vs = function(state)
+  cc.open_leftabove_vs(state, utils.wrap(fs.toggle_directory, state))
+end
 M.open_vsplit = function(state)
   cc.open_vsplit(state, utils.wrap(fs.toggle_directory, state))
 end