Add -txexpirydelta cli option

src/init.cpp

@@ -414,6 +414,7 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-sendfreetransactions", strprintf(_("Send transactions as zero-fee transactions if possible (default: %u)"), 0));
     strUsage += HelpMessageOpt("-spendzeroconfchange", strprintf(_("Spend unconfirmed change when sending transactions (default: %u)"), 1));
     strUsage += HelpMessageOpt("-txconfirmtarget=<n>", strprintf(_("If paytxfee is not set, include enough fee so transactions begin confirmation on average within n blocks (default: %u)"), DEFAULT_TX_CONFIRM_TARGET));
+    strUsage += HelpMessageOpt("-txexpirydelta", strprintf(_("Set the number of blocks after which a transaction that has not been mined will become invalid (default: %u)"), DEFAULT_TX_EXPIRY_DELTA));
     strUsage += HelpMessageOpt("-maxtxfee=<amt>", strprintf(_("Maximum total fees (in %s) to use in a single wallet transaction; setting this too low may abort large transactions (default: %s)"),
         CURRENCY_UNIT, FormatMoney(maxTxFee)));
     strUsage += HelpMessageOpt("-upgradewallet", _("Upgrade wallet to latest format") + " " + _("on startup"));
@@ -1009,6 +1010,7 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
         }
     }
     nTxConfirmTarget = GetArg("-txconfirmtarget", DEFAULT_TX_CONFIRM_TARGET);
+    expiryDelta = GetArg("-txexpirydelta", DEFAULT_TX_EXPIRY_DELTA);
     bSpendZeroConfChange = GetBoolArg("-spendzeroconfchange", true);
     fSendFreeTransactions = GetBoolArg("-sendfreetransactions", false);