feat(ui): make <C-w>o work inside opencode windows

lua/opencode/state.lua

@@ -80,7 +80,8 @@
 ---@field clear_hidden_window_state fun()
 ---@field has_hidden_buffers fun(): boolean
 ---@field consume_hidden_buffers fun(): OpencodeHiddenBuffers|nil
----@field resolve_toggle_decision fun(persist_state: boolean, has_display_route: boolean): OpencodeToggleDecision
+  ---@field are_opencode_only_windows fun(): boolean
+  ---@field resolve_toggle_decision fun(persist_state: boolean, has_display_route: boolean): OpencodeToggleDecision
 ---@field resolve_open_windows_action fun(): 'reuse_visible'|'restore_hidden'|'create_fresh'
 ---@field get_window_cursor fun(win_id: integer|nil): integer[]|nil
 
@@ -264,6 +265,43 @@ function M.are_windows_in_current_tab()
     or M.is_window_in_current_tab(_state.windows.output_win)
 end
 
+--- Returns true when every normal (non-floating) window in the current tab
+--- belongs to opencode (i.e. there are no code windows open alongside it).
+---@return boolean
+function M.are_opencode_only_windows()
+  local w = _state.windows
+  if not w then
+    return false
+  end
+
+  local opencode_wins = {}
+  if w.input_win and vim.api.nvim_win_is_valid(w.input_win) then
+    opencode_wins[w.input_win] = true
+  end
+  if w.output_win and vim.api.nvim_win_is_valid(w.output_win) then
+    opencode_wins[w.output_win] = true
+  end
+  if w.footer_win and vim.api.nvim_win_is_valid(w.footer_win) then
+    opencode_wins[w.footer_win] = true
+  end
+
+  -- No opencode windows tracked → not an only-opencode situation
+  if vim.tbl_isempty(opencode_wins) then
+    return false
+  end
+
+  local current_tab = vim.api.nvim_get_current_tabpage()
+  for _, win_id in ipairs(vim.api.nvim_tabpage_list_wins(current_tab)) do
+    local cfg = vim.api.nvim_win_get_config(win_id)
+    -- Skip floating windows
+    if cfg.relative == '' and not opencode_wins[win_id] then
+      return false
+    end
+  end
+
+  return true
+end
+
 ---@return boolean
 function M.is_visible()
   return M.get_window_state().status == 'visible'
@@ -274,6 +312,7 @@ end
 ---@field in_tab boolean
 ---@field persist_state boolean
 ---@field has_display_route boolean
+---@field only_windows boolean
 
 ---@generic T
 ---@param rules T[]
@@ -323,6 +362,12 @@ local TOGGLE_ACTION_RULES = {
       return ctx.status == 'visible' and ctx.in_tab and not ctx.persist_state
     end,
   },
+  {
+    action = 'hide',
+    when = function(ctx)
+      return ctx.status == 'visible' and ctx.in_tab and ctx.only_windows and not ctx.has_display_route
+    end,
+  },
   {
     action = 'hide',
     when = function(ctx)
@@ -348,6 +393,7 @@ local function lookup_toggle_action(status, in_tab, persist_state, has_display_r
     in_tab = in_tab,
     persist_state = persist_state,
     has_display_route = has_display_route,
+    only_windows = M.are_opencode_only_windows(),
   }
 
   local matched_rule = first_matching_rule(TOGGLE_ACTION_RULES, function(rule)

lua/opencode/ui/autocmds.lua

@@ -113,6 +113,46 @@ function M.setup_autocmds(windows)
       end,
     })
   end
+
+  M.setup_window_only_keymap(windows)
+end
+
+--- Set <C-w>o / <C-w><C-o> on both opencode buffers to close all other
+--- non-floating windows while keeping the opencode pair intact.
+--- Also clears the saved width ratio so the next open uses the config default.
+---@param windows OpencodeWindowState
+function M.setup_window_only_keymap(windows)
+  local opencode_wins = function()
+    local t = {}
+    for _, w in ipairs({ windows.input_win, windows.output_win, windows.footer_win }) do
+      if w then
+        t[w] = true
+      end
+    end
+    return t
+  end
+
+  local handler = function()
+    local keep = opencode_wins()
+    keep[vim.api.nvim_get_current_win()] = true
+    for _, win in ipairs(vim.api.nvim_tabpage_list_wins(0)) do
+      if not keep[win] and vim.api.nvim_win_is_valid(win) then
+        local cfg = vim.api.nvim_win_get_config(win)
+        if cfg.relative == '' then
+          pcall(vim.api.nvim_win_close, win, false)
+        end
+      end
+    end
+    -- Don't remember the current opencode width; next open will use config default
+    require('opencode.state').last_window_width_ratio = nil
+  end
+
+  for _, buf in ipairs({ windows.input_buf, windows.output_buf }) do
+    if buf and vim.api.nvim_buf_is_valid(buf) then
+      vim.keymap.set('n', '<C-w>o', handler, { buffer = buf, desc = 'Keep only opencode windows', nowait = true })
+      vim.keymap.set('n', '<C-w><C-o>', handler, { buffer = buf, desc = 'Keep only opencode windows', nowait = true })
+    end
+  end
 end
 
 ---@param windows OpencodeWindowState?

lua/opencode/ui/input_window.lua

@@ -280,9 +280,9 @@ function M.setup(windows)
   set_buf_option('buflisted', false, windows)
   set_buf_option('swapfile', false, windows)
 
-  if config.ui.position ~= 'current' then
-    set_win_option('winfixbuf', true, windows)
-  end
+  require('opencode.ui.buf_fix_win').fix_to_win(windows.input_buf, function()
+    return state.windows and state.windows.input_win
+  end)
   set_win_option('winfixwidth', true, windows)
 
   M.update_dimensions(windows)

lua/opencode/ui/output_window.lua

@@ -116,9 +116,9 @@ function M.setup(windows)
   set_buf_option('buflisted', false, windows.output_buf)
   set_buf_option('swapfile', false, windows.output_buf)
 
-  if config.ui.position ~= 'current' then
-    set_win_option('winfixbuf', true, windows.output_win)
-  end
+  require('opencode.ui.buf_fix_win').fix_to_win(windows.output_buf, function()
+    return state.windows and state.windows.output_win
+  end)
   set_win_option('winfixheight', true, windows.output_win)
   set_win_option('winfixwidth', true, windows.output_win)
   set_win_option('signcolumn', 'yes', windows.output_win)

lua/opencode/ui/ui.lua

@@ -108,7 +108,6 @@ end
 local function close_or_restore_output_window(windows)
   if config.ui.position == 'current' then
     if windows.output_win and vim.api.nvim_win_is_valid(windows.output_win) then
-      pcall(vim.api.nvim_set_option_value, 'winfixbuf', false, { win = windows.output_win })
       if state.current_code_buf and vim.api.nvim_buf_is_valid(state.current_code_buf) then
         pcall(vim.api.nvim_win_set_buf, windows.output_win, state.current_code_buf)
       end
@@ -135,7 +134,6 @@ function M.hide_visible_windows(windows)
 
   local snapshot = capture_hidden_snapshot(windows)
 
-  -- Only save width ratio for split modes (not dialog/current mode)
   if config.ui.position ~= 'current' then
     local total_cols = vim.o.columns
     local current_width = vim.api.nvim_win_get_width(windows.output_win)
@@ -329,10 +327,6 @@ function M.create_split_windows(input_buf, output_buf)
   local input_win = open_split(ui_conf.input_position, 'horizontal')
   local output_win = main_win
 
-  if ui_conf.position == 'current' then
-    pcall(vim.api.nvim_set_option_value, 'winfixbuf', false, { win = output_win })
-  end
-
   vim.api.nvim_win_set_buf(input_win, input_buf)
   vim.api.nvim_win_set_buf(output_win, output_buf)
   return { input_win = input_win, output_win = output_win }