Add per transaction fee to transfer command

Allows priority argument default/unimportant/normal/elevated/priority to
be used per transaction in CLI wallet's transfer command. Resolves #1913.

src/simplewallet/simplewallet.cpp

@@ -101,6 +101,7 @@ enum TransferType {
 
 namespace
 {
+  const auto allowed_priority_strings = {"default", "unimportant", "normal", "elevated", "priority"};
   const auto arg_wallet_file = wallet_args::arg_wallet_file();
   const command_line::arg_descriptor<std::string> arg_generate_new_wallet = {"generate-new-wallet", sw::tr("Generate new wallet and save it to <arg>"), ""};
   const command_line::arg_descriptor<std::string> arg_generate_from_view_key = {"generate-from-view-key", sw::tr("Generate incoming-only wallet from view key"), ""};
@@ -685,7 +686,7 @@ simple_wallet::simple_wallet()
   m_cmd_binder.set_handler("payments", boost::bind(&simple_wallet::show_payments, this, _1), tr("payments <PID_1> [<PID_2> ... <PID_N>] - Show payments for given payment ID[s]"));
   m_cmd_binder.set_handler("bc_height", boost::bind(&simple_wallet::show_blockchain_height, this, _1), tr("Show blockchain height"));
   m_cmd_binder.set_handler("transfer_original", boost::bind(&simple_wallet::transfer, this, _1), tr("Same as transfer, but using an older transaction building algorithm"));
-  m_cmd_binder.set_handler("transfer", boost::bind(&simple_wallet::transfer_new, this, _1), tr("transfer [<mixin_count>] <address> <amount> [<payment_id>] - Transfer <amount> to <address>. <mixin_count> is the number of extra inputs to include for untraceability. Multiple payments can be made at once by adding <address_2> <amount_2> etcetera (before the payment ID, if it's included)"));
+  m_cmd_binder.set_handler("transfer", boost::bind(&simple_wallet::transfer_new, this, _1), tr("transfer [<priority>] [<mixin_count>] <address> <amount> [<payment_id>] - Transfer <amount> to <address>. <priority> is the priority of the transaction. The higher the priority, the higher the fee of the transaction. Valid values in priority order (from lowest to highest) are: unimportant, normal, elevated, priority. If omitted, the default value (see the command \"set priority\") is used. <mixin_count> is the number of extra inputs to include for untraceability. Multiple payments can be made at once by adding <address_2> <amount_2> etcetera (before the payment ID, if it's included)"));
   m_cmd_binder.set_handler("locked_transfer", boost::bind(&simple_wallet::locked_transfer, this, _1), tr("locked_transfer [<mixin_count>] <addr> <amount> <lockblocks>(Number of blocks to lock the transaction for, max 1000000) [<payment_id>]"));
   m_cmd_binder.set_handler("sweep_unmixable", boost::bind(&simple_wallet::sweep_unmixable, this, _1), tr("Send all unmixable outputs to yourself with mixin 0"));
   m_cmd_binder.set_handler("sweep_all", boost::bind(&simple_wallet::sweep_all, this, _1), tr("sweep_all [mixin] address [payment_id] - Send all unlocked balance to an address"));
@@ -2205,6 +2206,18 @@ bool simple_wallet::transfer_main(int transfer_type, const std::vector<std::stri
 
   std::vector<std::string> local_args = args_;
 
+  int priority = 0;
+  if(local_args.size() > 0) {
+    auto priority_pos = std::find(
+      allowed_priority_strings.begin(),
+      allowed_priority_strings.end(),
+      local_args[0]);
+    if(priority_pos != allowed_priority_strings.end()) {
+      local_args.erase(local_args.begin());
+      priority = std::distance(allowed_priority_strings.begin(), priority_pos);
+    }
+  }
+
   size_t fake_outs_count;
   if(local_args.size() > 0) {
     if(!epee::string_tools::get_xtype_from_string(fake_outs_count, local_args[0]))
@@ -2356,15 +2369,15 @@ bool simple_wallet::transfer_main(int transfer_type, const std::vector<std::stri
           return true;
         }
         unlock_block = bc_height + locked_blocks;
-        ptx_vector = m_wallet->create_transactions_2(dsts, fake_outs_count, unlock_block /* unlock_time */, 0 /* unused fee arg*/, extra, m_trusted_daemon);
+        ptx_vector = m_wallet->create_transactions_2(dsts, fake_outs_count, unlock_block /* unlock_time */, priority, extra, m_trusted_daemon);
       break;
       case TransferNew:
-        ptx_vector = m_wallet->create_transactions_2(dsts, fake_outs_count, 0 /* unlock_time */, 0 /* unused fee arg*/, extra, m_trusted_daemon);
+        ptx_vector = m_wallet->create_transactions_2(dsts, fake_outs_count, 0 /* unlock_time */, priority, extra, m_trusted_daemon);
       break;
       default:
         LOG_ERROR("Unknown transfer method, using original");
       case TransferOriginal:
-        ptx_vector = m_wallet->create_transactions(dsts, fake_outs_count, 0 /* unlock_time */, 0 /* unused fee arg*/, extra, m_trusted_daemon);
+        ptx_vector = m_wallet->create_transactions(dsts, fake_outs_count, 0 /* unlock_time */, priority, extra, m_trusted_daemon);
         break;
     }