feat: preserve layout when all non-neotree splits are closed

Dockerfile

@@ -10,8 +10,8 @@ RUN apk update && apk add --no-cache \
     gettext-tiny-dev \
     git
 
-# Install neovim
-RUN git clone --depth=1 https://github.com/neovim/neovim --branch release-0.10
+# install neovim
+RUN git clone https://github.com/neovim/neovim
 RUN cd neovim && make CMAKE_BUILD_TYPE=RelWithDebInfo && make install
 
 # --- Final Stage ---

lua/neo-tree/setup/init.lua

@@ -671,6 +671,85 @@ M.merge_config = function(user_config)
     id = "neo-tree-win-enter",
   })
 
+  vim.api.nvim_create_autocmd("WinClosed", {
+    callback = function(args)
+      local closing_win = tonumber(args.match)
+      if utils.is_floating(closing_win) then
+        return
+      end
+
+      local neotree_sidebar_exists = false
+      for _, win in ipairs(vim.api.nvim_tabpage_list_wins(0)) do
+        if win ~= closing_win then
+          local buf = vim.api.nvim_win_get_buf(win)
+          local neotree_pos = vim.b[buf].neo_tree_position
+          if not utils.is_floating(win) and neotree_pos then
+            neotree_sidebar_exists = true
+          end
+        end
+      end
+
+      if not neotree_sidebar_exists then
+        return
+      end
+
+      -- When we have an open sidebar and the other non-floating windows are all closed, prevent neo-tree from expanding.
+      local floating_wins = {}
+      local neotree_wins = {}
+      for _, win in ipairs(vim.api.nvim_list_wins()) do
+        local buf = vim.api.nvim_win_get_buf(win)
+        local neotree_pos = vim.b[buf].neo_tree_position
+        if utils.is_floating(win) then
+          table.insert(floating_wins, win)
+        end
+        if neotree_pos then
+          table.insert(neotree_wins, win)
+        end
+      end
+
+      -- skip buffers shown in floating windows and neotree windows
+      local skip = {}
+      for _, win in pairs(floating_wins) do
+        local buf = vim.api.nvim_win_get_buf(win)
+        skip[buf] = buf
+      end
+      for _, win in pairs(neotree_wins) do
+        local buf = vim.api.nvim_win_get_buf(win)
+        skip[buf] = buf
+      end
+
+      local bufs = {}
+      for _, buf in ipairs(vim.api.nvim_list_bufs()) do
+        if not skip[buf] then
+          table.insert(bufs, buf)
+        end
+      end
+
+      -- sort by last enter time
+      table.sort(bufs, function(a, b)
+        return (vim.b[a].neotree_enter or 0) > (vim.b[b].neotree_enter or 0)
+      end)
+
+      local altbuf = nil
+      for _, buf in ipairs(bufs) do
+        if args.buf ~= buf then
+          altbuf = buf
+          break
+        end
+      end
+
+      vim.cmd(altbuf and "sb " .. altbuf or "new")
+    end,
+  })
+
+  local enter_tick = 1
+  vim.api.nvim_create_autocmd("WinEnter", {
+    callback = function(args)
+      vim.b[args.buf].neotree_enter = enter_tick
+      enter_tick = enter_tick + 1
+    end,
+  })
+
   --Dispose ourselves if the tab closes
   events.subscribe({
     event = events.VIM_TAB_CLOSED,

lua/neo-tree/utils/init.lua

@@ -765,7 +765,7 @@ end
 ---@param state neotree.State
 ---@param path string The file to open
 ---@param open_cmd string? The vimcommand to use to open the file
----@param bufnr number|nil The buffer number to open
+---@param bufnr integer? The buffer number to open
 M.open_file = function(state, path, open_cmd, bufnr)
   open_cmd = open_cmd or "edit"
   -- If the file is already open, switch to it.
@@ -783,65 +783,67 @@ M.open_file = function(state, path, open_cmd, bufnr)
     end
   end
 
-  if M.truthy(path) then
-    local relative = require("neo-tree").config.open_files_using_relative_paths
-    local escaped_path = M.escape_path_for_cmd(relative and vim.fn.fnamemodify(path, ":.") or path)
-    local bufnr_or_path = bufnr or escaped_path
-    local events = require("neo-tree.events")
-    local result = true
-    local err = nil
-    local event_result = events.fire_event(events.FILE_OPEN_REQUESTED, {
-      state = state,
-      path = path,
-      open_cmd = open_cmd,
-      bufnr = bufnr,
-    }) or {}
-    if event_result.handled then
-      events.fire_event(events.FILE_OPENED, path)
-      return
-    end
-    if state.current_position == "current" then
+  if not path or not M.truthy(path) then
+    return
+  end
+
+  local relative = require("neo-tree").config.open_files_using_relative_paths
+  local escaped_path = M.escape_path_for_cmd(relative and vim.fn.fnamemodify(path, ":.") or path)
+  local bufnr_or_path = bufnr or escaped_path
+  local events = require("neo-tree.events")
+  local result = true
+  local err = nil
+  local event_result = events.fire_event(events.FILE_OPEN_REQUESTED, {
+    state = state,
+    path = path,
+    open_cmd = open_cmd,
+    bufnr = bufnr,
+  }) or {}
+  if event_result.handled then
+    events.fire_event(events.FILE_OPENED, path)
+    return
+  end
+  if state.current_position == "current" then
+    ---@diagnostic disable-next-line: param-type-mismatch
+    result, err = pcall(vim.cmd, open_cmd .. " " .. bufnr_or_path)
+  else
+    local winid, is_neo_tree_window = M.get_appropriate_window(state)
+    vim.api.nvim_set_current_win(winid)
+    -- TODO: make this configurable, see issue #43
+    if is_neo_tree_window then
+      local width = vim.api.nvim_win_get_width(0)
+      if width == vim.o.columns then
+        -- Neo-tree must be the only window, restore it's status as a sidebar
+        width = M.get_value(state, "window.width", 40, false)
+        width = M.resolve_width(width)
+      end
+      result, err = M.force_new_split(state.current_position, escaped_path)
+      vim.api.nvim_win_set_width(winid, width)
+    else
       ---@diagnostic disable-next-line: param-type-mismatch
       result, err = pcall(vim.cmd, open_cmd .. " " .. bufnr_or_path)
-    else
-      local winid, is_neo_tree_window = M.get_appropriate_window(state)
-      vim.api.nvim_set_current_win(winid)
-      -- TODO: make this configurable, see issue #43
-      if is_neo_tree_window then
-        local width = vim.api.nvim_win_get_width(0)
-        if width == vim.o.columns then
-          -- Neo-tree must be the only window, restore it's status as a sidebar
-          width = M.get_value(state, "window.width", 40, false)
-          width = M.resolve_width(width)
-        end
-        result, err = M.force_new_split(state.current_position, escaped_path)
-        vim.api.nvim_win_set_width(winid, width)
-      else
-        ---@diagnostic disable-next-line: param-type-mismatch
-        result, err = pcall(vim.cmd, open_cmd .. " " .. bufnr_or_path)
-      end
-    end
-    if not result and string.find(err or "", "winfixbuf") and M.is_winfixbuf() then
-      local winid, is_neo_tree_window = M.get_appropriate_window(state, true)
-      -- Rescan window list to find a window that is not winfixbuf.
-      -- If found, retry executing command in that window,
-      -- otherwise, all windows are either neo-tree or winfixbuf so we make a new split.
-      if not is_neo_tree_window and not M.is_winfixbuf(winid) then
-        vim.api.nvim_set_current_win(winid)
-        ---@diagnostic disable-next-line: param-type-mismatch
-        result, err = pcall(vim.cmd, open_cmd .. " " .. bufnr_or_path)
-      else
-        result, err = M.force_new_split(state.current_position, escaped_path)
-      end
     end
-    if result or err == "Vim(edit):E325: ATTENTION" then
-      -- fixes #321
-      vim.bo[0].buflisted = true
-      events.fire_event(events.FILE_OPENED, path)
+  end
+  if not result and string.find(err or "", "winfixbuf") and M.is_winfixbuf() then
+    local winid, is_neo_tree_window = M.get_appropriate_window(state, true)
+    -- Rescan window list to find a window that is not winfixbuf.
+    -- If found, retry executing command in that window,
+    -- otherwise, all windows are either neo-tree or winfixbuf so we make a new split.
+    if not is_neo_tree_window and not M.is_winfixbuf(winid) then
+      vim.api.nvim_set_current_win(winid)
+      ---@diagnostic disable-next-line: param-type-mismatch
+      result, err = pcall(vim.cmd, open_cmd .. " " .. bufnr_or_path)
     else
-      log.error("Error opening file:", err)
+      result, err = M.force_new_split(state.current_position, escaped_path)
     end
   end
+  if result or err == "Vim(edit):E325: ATTENTION" then
+    -- fixes #321
+    vim.bo[0].buflisted = true
+    events.fire_event(events.FILE_OPENED, path)
+  else
+    log.error("Error opening file:", err)
+  end
 end
 
 M.reduce = function(list, memo, func)