feat: trigger suggestion using the accept keymap (#327)

Author: nilp0inter

README.md

@@ -128,7 +128,7 @@ require("copilot.panel").refresh()
 
 When `auto_trigger` is `true`, copilot starts suggesting as soon as you enter insert mode.
 
-When `auto_trigger` is `false`, use the `next` or `prev` keymap to trigger copilot suggestion.
+When `auto_trigger` is `false`, use the `next`, `prev` or `accept` keymap to trigger copilot suggestion.
 
 To toggle auto trigger for the current buffer, use `require("copilot.suggestion").toggle_auto_trigger()`.
 
@@ -148,6 +148,7 @@ cmp.event:on("menu_closed", function()
   vim.b.copilot_suggestion_hidden = false
 end)
 ```
+
 </details>
 
 <details>
@@ -169,8 +170,8 @@ vim.api.nvim_create_autocmd("User", {
 })
 
 ```
-</details>
 
+</details>
 
 The `copilot.suggestion` module exposes the following functions:
 

lua/copilot/suggestion.lua

@@ -447,6 +447,12 @@ end
 function mod.accept(modifier)
   local ctx = get_ctx()
 
+  -- no suggestion request yet
+  if not ctx.first then
+    schedule(ctx)
+    return
+  end
+
   local suggestion = get_current_suggestion(ctx)
   if not suggestion or vim.fn.empty(suggestion.text) == 1 then
     return