jp: new confirm method:

it completes `confirmOrQuit` method to ask confirmation without quitting.

sat_frontends/jp/base.py

@@ -685,11 +685,15 @@ class Jp(object):
         loop.add_reader(sys.stdin, self._read_stdin, stdin_fut)
         return await stdin_fut
 
+    async def confirm(self, message):
+        """Request user to confirm action, return answer as boolean"""
+        res = await self.ainput(f"{message} (y/N)? ")
+        return res in ("y", "Y")
+
     async def confirmOrQuit(self, message, cancel_message=_("action cancelled by user")):
         """Request user to confirm action, and quit if he doesn't"""
-
-        res = await self.ainput(f"{message} (y/N)? ")
-        if res not in ("y", "Y"):
+        confirmed = await self.confirm(message)
+        if not confirmed:
             self.disp(cancel_message)
             self.quit(C.EXIT_USER_CANCELLED)