Port -txsend from str4d #37, https://github.com/zcash/zcash/pull/4522

src/init.cpp

@@ -392,6 +392,7 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-sysperms", _("Create new files with system default permissions, instead of umask 077 (only effective with disabled wallet functionality)"));
 #endif
     strUsage += HelpMessageOpt("-txindex", strprintf(_("Maintain a full transaction index, used by the getrawtransaction rpc call (default: %u)"), 0));
+    strUsage += HelpMessageOpt("-txsend=<cmd>", _("Execute command to send a transaction instead of broadcasting (%s in cmd is replaced by transaction hex)"));
     strUsage += HelpMessageOpt("-addressindex", strprintf(_("Maintain a full address index, used to query for the balance, txids and unspent outputs for addresses (default: %u)"), DEFAULT_ADDRESSINDEX));
     strUsage += HelpMessageOpt("-timestampindex", strprintf(_("Maintain a timestamp index for block hashes, used to query blocks hashes by a range of timestamps (default: %u)"), DEFAULT_TIMESTAMPINDEX));
     strUsage += HelpMessageOpt("-spentindex", strprintf(_("Maintain a full spent index, used to query the spending txid and input index for an outpoint (default: %u)"), DEFAULT_SPENTINDEX));
@@ -1118,6 +1119,16 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
 #endif
     }
 
+      if (mapArgs.count("-txsend")) {
+        if (GetBoolArg("-walletbroadcast", true))  {
+            if (SoftSetBoolArg("-walletbroadcast", false)) {
+                LogPrintf("%s: parameter interaction: -txsend=<cmd> -> setting -walletbroadcast=0\n", __func__);
+            } else {
+                return InitError(_("Wallet transaction broadcasting is incompatible with -txsend (for privacy)."));
+            }
+        }
+    }
+
     // ********************************************************* Step 3: parameter-to-internal-flags
 
     fZdebug=GetBoolArg("-zdebug", false);