Add support for overriding the default yank_diff register (#389)

README.md

@@ -199,6 +199,8 @@ Also see [here](/lua/CopilotChat/config.lua):
   proxy = nil, -- [protocol://]host[:port] Use this proxy
   allow_insecure = false, -- Allow insecure server connections
 
+  yank_diff_register = '"', -- Allow overriding the register for yanking diffs
+
   system_prompt = prompts.COPILOT_INSTRUCTIONS, -- System prompt to use
   model = 'gpt-4o', -- GPT model to use, 'gpt-3.5-turbo', 'gpt-4', or 'gpt-4o'
   temperature = 0.1, -- GPT temperature

lua/CopilotChat/config.lua

@@ -58,6 +58,7 @@ local select = require('CopilotChat.select')
 ---@field proxy string?
 ---@field allow_insecure boolean?
 ---@field system_prompt string?
+---@field yank_diff_register string?
 ---@field model string?
 ---@field temperature number?
 ---@field question_header string?
@@ -82,6 +83,8 @@ return {
   proxy = nil, -- [protocol://]host[:port] Use this proxy
   allow_insecure = false, -- Allow insecure server connections
 
+  yank_diff_register = '"', -- Allows overriding the register for yanking diffs
+
   system_prompt = prompts.COPILOT_INSTRUCTIONS, -- System prompt to use
   model = 'gpt-4o-2024-05-13', -- GPT model to use, 'gpt-3.5-turbo', 'gpt-4', or `gpt-4o-2024-05-13`
   temperature = 0.1, -- GPT temperature

lua/CopilotChat/init.lua

@@ -774,7 +774,7 @@ function M.setup(config)
       local lines = find_lines_between_separator(section_lines, '^```%w*$', true)
       if #lines > 0 then
         local content = table.concat(lines, '\n')
-        vim.fn.setreg('"', content)
+        vim.fn.setreg(M.config.yank_diff_register, content)
       end
     end)