feat: add <leader>oy mapping to add visual selection to context across buffers

 - Add add_visual_selection and command

This should fix #248

Author: sudo-tee

README.md

@@ -131,6 +131,7 @@ require('opencode').setup({
       ['<leader>oR'] = { 'rename_session' }, -- Rename current session
       ['<leader>op'] = { 'configure_provider' }, -- Quick provider and model switch from predefined list
       ['<leader>oV'] = { 'configure_variant' }, -- Switch model variant for the current model
+      ['<leader>oy'] = { 'add_visual_selection' },
       ['<leader>oz'] = { 'toggle_zoom' }, -- Zoom in/out on the Opencode windows
       ['<leader>ov'] = { 'paste_image'}, -- Paste image from clipboard into current session
       ['<leader>od'] = { 'diff_open' }, -- Opens a diff tab of a modified file since the last opencode prompt

lua/opencode/api.lua

@@ -1013,6 +1013,18 @@ M.review = Promise.async(function(args)
     end)
 end)
 
+--- Add the current visual selection to the context without opening/focusing the panel.
+--- Can be called from any buffer. Selections accumulate across files.
+M.add_visual_selection = Promise.async(
+  ---@param _ any Unused
+  ---@param range OpencodeSelectionRange
+  function(_, range)
+    local context = require('opencode.context')
+    context.add_visual_selection(range)
+    M.open_input():await()
+  end
+)
+
 ---@type table<string, OpencodeUICommand>
 M.commands = {
   open = {
@@ -1369,6 +1381,11 @@ M.commands = {
     desc = 'Browse code references from conversation',
     fn = M.references,
   },
+
+  add_visual_selection = {
+    desc = 'Add current visual selection to context',
+    fn = M.add_visual_selection,
+  },
 }
 
 M.slash_commands_map = {
@@ -1449,6 +1466,7 @@ M.legacy_command_map = {
 
 function M.route_command(opts)
   local args = vim.split(opts.args or '', '%s+', { trimempty = true })
+  ---@type OpencodeSelectionRange|nil
   local range = nil
 
   if opts.range and opts.range > 0 then

lua/opencode/config.lua

@@ -28,6 +28,7 @@ M.defaults = {
       ['<leader>oR'] = { 'rename_session', desc = 'Rename session' },
       ['<leader>op'] = { 'configure_provider', desc = 'Configure provider' },
       ['<leader>oV'] = { 'configure_variant', desc = 'Configure model variant' },
+      ['<leader>oy'] = { 'add_visual_selection', desc = 'Add visual selection to context', mode = { 'v' } },
       ['<leader>oz'] = { 'toggle_zoom', desc = 'Toggle zoom' },
       ['<leader>ov'] = { 'paste_image', desc = 'Paste image from clipboard' },
       ['<leader>od'] = { 'diff_open', desc = 'Open diff view' },

lua/opencode/context.lua

@@ -82,6 +82,43 @@ function M.clear_selections()
   ChatContext.clear_selections()
 end
 
+--- Captures the current visual selection and adds it to the context.
+--- This can be called from any buffer at any time, even when the panel is already open.
+--- Selections persist across file switches and accumulate across buffers.
+---@param range? OpencodeSelectionRange
+---@return boolean success Whether a selection was successfully added
+function M.add_visual_selection(range)
+  local buf = vim.api.nvim_get_current_buf()
+
+  if not util.is_buf_a_file(buf) then
+    vim.notify('Cannot add selection: not a file buffer', vim.log.levels.WARN)
+    return false
+  end
+
+  local current_selection = BaseContext.get_current_selection(nil, range)
+  if not current_selection then
+    vim.notify('No visual selection found', vim.log.levels.WARN)
+    return false
+  end
+
+  local file = BaseContext.get_current_file_for_selection(buf)
+  if not file then
+    vim.notify('Cannot determine file for selection', vim.log.levels.WARN)
+    return false
+  end
+
+  local selection = BaseContext.new_selection(file, current_selection.text, current_selection.lines)
+  M.add_selection(selection)
+
+  vim.notify(
+    string.format('Selection added from %s (lines %s)', file.name, current_selection.lines),
+    vim.log.levels.INFO
+  )
+
+  vim.api.nvim_feedkeys(vim.api.nvim_replace_termcodes('<Esc>', true, false, true), 'n', true)
+  return true
+end
+
 function M.add_file(file)
   local is_file = vim.fn.filereadable(file) == 1
   local is_dir = vim.fn.isdirectory(file) == 1

lua/opencode/context/base_context.lua

@@ -188,14 +188,15 @@ function M.get_current_cursor_data(buf, win, context_config)
 end
 
 ---@param context_config? OpencodeContextConfig
+---@param range? OpencodeSelectionRange
 ---@return table|nil
-function M.get_current_selection(context_config)
+function M.get_current_selection(context_config, range)
   if not M.is_context_enabled('selection', context_config) then
     return nil
   end
 
   -- Return nil if not in a visual mode
-  if not vim.fn.mode():match('[vV\022]') then
+  if not vim.fn.mode():match('[vV\022]') and not range then
     return nil
   end
 

lua/opencode/types.lua

@@ -556,3 +556,7 @@
 ---@field messages number Number of messages reverted
 ---@field tool_calls number Number of tool calls reverted
 ---@field files table<string, {additions: number, deletions: number}> Summary of file changes reverted
+
+---@class OpencodeSelectionRange
+---@field start number Starting line number (inclusive)
+---@field stop number Ending line number (inclusive)