feat(ui): add configurable input window options (#324)

Allow users to customize window-local options for the input window via
`ui.input.win_options` in config. Any valid Neovim window option can be set,
such as signcolumn, cursorline, number, relativenumber, etc. This improves
flexibility for user preferences and editor appearance.

Author: jugarpeupv

lua/opencode/config.lua

@@ -160,6 +160,16 @@ M.defaults = {
       },
       -- Auto-hide input window when prompt is submitted or focus switches to output window
       auto_hide = false,
+      -- Window-local options applied to the input window.
+      -- Any valid Neovim window option can be added here.
+      -- Users can override these and add any extra option, e.g.:
+      --   win_options = { signcolumn = 'no', cursorline = true, conceallevel = 2 }
+      win_options = {
+        signcolumn = 'yes',
+        cursorline = false,
+        number = false,
+        relativenumber = false,
+      },
     },
     picker = {
       snacks_layout = nil,

lua/opencode/types.lua

@@ -142,11 +142,28 @@
 ---@field highlights? OpencodeHighlightConfig
 ---@field picker OpencodeUIPickerConfig
 
+---Window-local options applied to the input window.
+---Any valid Neovim window-local option (`:h window-variable`) can be set here.
+---Common examples:
+---  signcolumn = 'no'
+---  cursorline = true
+---  number = true
+---  relativenumber = true
+---  foldcolumn = '0'
+---  statuscolumn = ''
+---  conceallevel = 2
+---@class OpencodeUIInputWinOptions : table<string, any>
+---@field signcolumn? string # Value for 'signcolumn' (e.g. 'yes', 'no', 'auto')
+---@field cursorline? boolean
+---@field number? boolean
+---@field relativenumber? boolean
+
 ---@class OpencodeUIInputConfig
 ---@field text { wrap: boolean }
 ---@field min_height number
 ---@field max_height number
 ---@field auto_hide boolean
+---@field win_options? OpencodeUIInputWinOptions # Window-local options applied to the input window. Any valid Neovim window option is accepted.
 
 ---@class OpencodeHighlightConfig
 ---@field vertical_borders? { tool?: { fg?: string, bg?: string }, user?: { fg?: string, bg?: string }, assistant?: { fg?: string, bg?: string } }

lua/opencode/ui/input_window.lua

@@ -268,10 +268,13 @@ function M.setup(windows)
 
   set_buf_option('filetype', 'opencode', windows)
   set_win_option('winhighlight', config.ui.window_highlight, windows)
-  set_win_option('signcolumn', 'yes', windows)
-  set_win_option('cursorline', false, windows)
-  set_win_option('number', false, windows)
-  set_win_option('relativenumber', false, windows)
+
+  -- Apply user-configurable window options
+  local win_opts = config.ui.input.win_options or {}
+  for opt, value in pairs(win_opts) do
+    pcall(set_win_option, opt, value, windows)
+  end
+
   set_buf_option('buftype', 'nofile', windows)
   set_buf_option('bufhidden', 'hide', windows)
   set_buf_option('buflisted', false, windows)