feat: add focus_preview command, closes #672 (#675)

Author: ttytm

README.md

@@ -200,6 +200,7 @@ use {
             ["<cr>"] = "open",
             ["<esc>"] = "revert_preview",
             ["P"] = { "toggle_preview", config = { use_float = true } },
+            ["l"] = "focus_preview"
             ["S"] = "open_split",
             ["s"] = "open_vsplit",
             -- ["S"] = "split_with_window_picker",

doc/neo-tree.txt

@@ -195,6 +195,8 @@ z         = close_all_nodes: Close all nodes in the tree.
 
 P          = toggle_preview: Toggles "preview mode", see |neo-tree-preview-mode| 
 
+l          = focus_preview: Focus the active preview window
+
 <esc>      = revert_preview: Ends "preview_mode" if it is enabled, and reverts
                              any preview windows to what was being shown before
                              preview mode began.

lua/neo-tree/defaults.lua

@@ -312,6 +312,7 @@ local config = {
       ["<cr>"] = "open",
       ["<esc>"] = "revert_preview",
       ["P"] = { "toggle_preview", config = { use_float = true } },
+      ["l"] = "focus_preview",
       ["S"] = "open_split",
       -- ["S"] = "split_with_window_picker",
       ["s"] = "open_vsplit",

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

@@ -487,6 +487,10 @@ M.toggle_preview = function(state)
   Preview.toggle(state)
 end
 
+M.focus_preview = function()
+  Preview.focus()
+end
+
 ---Open file or directory
 ---@param state table The state of the source
 ---@param open_cmd string The vim command to use to open the file

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

@@ -393,7 +393,7 @@ Preview.toggle = function(state)
     local preview_event = {
       event = events.VIM_CURSOR_MOVED,
       handler = function()
-        if not toggle_state then
+        if not toggle_state or vim.api.nvim_get_current_win() == instance.winid then
           return
         end
         if vim.api.nvim_get_current_win() == winid then
@@ -410,4 +410,10 @@ Preview.toggle = function(state)
   end
 end
 
+Preview.focus = function()
+  if Preview.is_active() then
+    vim.fn.win_gotoid(instance.winid)
+  end
+end
+
 return Preview