1 files changed, 23 insertions, 24 deletions

diff --git a/src/chainparamsbase.cpp b/src/chainparamsbase.cpp
index 9c87bf2154..db2dc751f5 100644
--- a/src/chainparamsbase.cpp
+++ b/src/chainparamsbase.cpp
@@ -5,10 +5,25 @@
 
 #include "chainparamsbase.h"
 
+#include "tinyformat.h"
 #include "util.h"
 
 #include <assert.h>
 
+const std::string CBaseChainParams::MAIN = "main";
+const std::string CBaseChainParams::TESTNET = "test";
+const std::string CBaseChainParams::REGTEST = "regtest";
+
+void AppendParamsHelpMessages(std::string& strUsage, bool debugHelp)
+{
+    strUsage += HelpMessageGroup(_("Chain selection options:"));
+    strUsage += HelpMessageOpt("-testnet", _("Use the test chain"));
+    if (debugHelp) {
+        strUsage += HelpMessageOpt("-regtest", "Enter regression test mode, which uses a special chain in which blocks can be solved instantly. "
+                                   "This is intended for regression testing tools and app development.");
+    }
+}
+
 /**
  * Main network
  */
@@ -71,31 +86,25 @@ const CBaseChainParams& BaseParams()
     return *pCurrentBaseParams;
 }
 
-void SelectBaseParams(CBaseChainParams::Network network)
+void SelectBaseParams(const std::string& chain)
 {
-    switch (network) {
-    case CBaseChainParams::MAIN:
+    if (chain == CBaseChainParams::MAIN)
         pCurrentBaseParams = &mainParams;
-        break;
-    case CBaseChainParams::TESTNET:
+    else if (chain == CBaseChainParams::TESTNET)
         pCurrentBaseParams = &testNetParams;
-        break;
-    case CBaseChainParams::REGTEST:
+    else if (chain == CBaseChainParams::REGTEST)
         pCurrentBaseParams = &regTestParams;
-        break;
-    default:
-        assert(false && "Unimplemented network");
-        return;
-    }
+    else
+        throw std::runtime_error(strprintf("%s: Unknown chain %s.", __func__, chain));
 }
 
-CBaseChainParams::Network NetworkIdFromCommandLine()
+std::string ChainNameFromCommandLine()
 {
     bool fRegTest = GetBoolArg("-regtest", false);
     bool fTestNet = GetBoolArg("-testnet", false);
 
     if (fTestNet && fRegTest)
-        return CBaseChainParams::MAX_NETWORK_TYPES;
+        throw std::runtime_error("Invalid combination of -regtest and -testnet.");
     if (fRegTest)
         return CBaseChainParams::REGTEST;
     if (fTestNet)
@@ -103,16 +112,6 @@ CBaseChainParams::Network NetworkIdFromCommandLine()
     return CBaseChainParams::MAIN;
 }
 
-bool SelectBaseParamsFromCommandLine()
-{
-    CBaseChainParams::Network network = NetworkIdFromCommandLine();
-    if (network == CBaseChainParams::MAX_NETWORK_TYPES)
-        return false;
-
-    SelectBaseParams(network);
-    return true;
-}
-
 bool AreBaseParamsConfigured()
 {
     return pCurrentBaseParams != NULL;