Language settings for copilot answers

README.md

@@ -39,6 +39,7 @@ return {
     },
     opts = {
       debug = true, -- Enable debugging
+      -- language = "English" -- Copilot answer language settings when using default prompts. Default language is English.
       -- See Configuration section for rest
     },
     -- See Commands section for default commands if you want to lazy load on them

lua/CopilotChat/config.lua

@@ -50,6 +50,7 @@ local select = require('CopilotChat.select')
 ---@field proxy string?
 ---@field allow_insecure boolean?
 ---@field debug boolean?
+---@field language string?
 ---@field show_user_selection boolean?
 ---@field show_system_prompt boolean?
 ---@field show_folds boolean?
@@ -76,6 +77,7 @@ return {
   auto_follow_cursor = true, -- Auto-follow cursor in chat
   name = 'CopilotChat', -- Name to use in chat
   separator = '---', -- Separator to use in chat
+  language = nil, -- Copilot answer language settings when using default prompts. Default language is English.
   -- default prompts
   prompts = {
     Explain = {

lua/CopilotChat/init.lua

@@ -396,10 +396,23 @@ function M.debug(debug)
   log.logfile = logfile
 end
 
+--- Set up the language for default prompts
+---@param config CopilotChat.config|nil
+function M.setup_copilot_language(config)
+  if not config or not config.language then
+    return
+  end
+
+  for _, prompt in pairs(config.prompts) do
+    prompt.prompt = prompt.prompt .. ' ' .. prompts.PROMPT_ANSWER_LANGUAGE_TEMPLATE(config.language)
+  end
+end
+
 --- Set up the plugin
 ---@param config CopilotChat.config|nil
 function M.setup(config)
   M.config = vim.tbl_deep_extend('force', default_config, config or {})
+  M.setup_copilot_language(M.config)
   state.copilot = Copilot(M.config.proxy, M.config.allow_insecure)
 
   state.diff = Diff(

lua/CopilotChat/prompts.lua

@@ -175,4 +175,10 @@ M.SHOW_CONTEXT = [[
 At the beginning of your response show code outline from all the provided files coming from Context and Active Selection.
 ]]
 
+---Prompt for the user to provide a language
+--- @param language string
+function M.PROMPT_ANSWER_LANGUAGE_TEMPLATE(language)
+  return string.format([[Please answer in %s.]], language)
+end
+
 return M