nak key combine and nak event --musig2

event.go

@@ -53,6 +53,31 @@ example:
 			Usage:       "private key to when communicating with the bunker given on --connect",
 			DefaultText: "a random key",
 		},
+		// ~ these args are only for the convoluted musig2 signing process
+		// they will be generally copy-shared-pasted across some manual coordination method between participants
+		&cli.UintFlag{
+			Name:        "musig2",
+			Usage:       "number of signers to use for musig2",
+			Value:       1,
+			DefaultText: "1 -- i.e. do not use musig2 at all",
+		},
+		&cli.StringSliceFlag{
+			Name:   "musig2-pubkey",
+			Hidden: true,
+		},
+		&cli.StringFlag{
+			Name:   "musig2-nonce-secret",
+			Hidden: true,
+		},
+		&cli.StringSliceFlag{
+			Name:   "musig2-nonce",
+			Hidden: true,
+		},
+		&cli.StringSliceFlag{
+			Name:   "musig2-partial",
+			Hidden: true,
+		},
+		// ~~~
 		&cli.BoolFlag{
 			Name:  "envelope",
 			Usage: "print the event enveloped in a [\"EVENT\", ...] message ready to be sent to a relay",
@@ -226,6 +251,21 @@ example:
 					if err := bunker.SignEvent(c.Context, &evt); err != nil {
 						return fmt.Errorf("failed to sign with bunker: %w", err)
 					}
+				} else if numSigners := c.Uint("musig2"); numSigners > 1 && sec != "" {
+					pubkeys := c.StringSlice("musig2-pubkey")
+					secNonce := c.String("musig2-nonce-secret")
+					pubNonces := c.StringSlice("musig2-nonce")
+					partialSigs := c.StringSlice("musig2-partial")
+					signed, err := performMusig(c.Context,
+						sec, &evt, int(numSigners), pubkeys, pubNonces, secNonce, partialSigs)
+					if err != nil {
+						return fmt.Errorf("musig2 error: %w", err)
+					}
+					if !signed {
+						// we haven't finished signing the event, so the users still have to do more steps
+						// instructions for what to do should have been printed by the performMusig() function
+						return nil
+					}
 				} else if err := evt.Sign(sec); err != nil {
 					return fmt.Errorf("error signing with provided key: %w", err)
 				}