Refactor -alertnotify code

Refactor common -alertnotify code into static CAlert::Notify method.

src/alert.cpp

@@ -233,14 +233,25 @@ bool CAlert::ProcessAlert(bool fThread)
         if(AppliesToMe())
         {
             uiInterface.NotifyAlertChanged(GetHash(), CT_NEW);
+            Notify(strStatusBar, fThread);
+        }
+    }
+
+    LogPrint("alert", "accepted alert %d, AppliesToMe()=%d\n", nID, AppliesToMe());
+    return true;
+}
+
+void
+CAlert::Notify(const std::string& strMessage, bool fThread)
+{
     std::string strCmd = GetArg("-alertnotify", "");
-            if (!strCmd.empty())
-            {
+    if (strCmd.empty()) return;
+
     // Alert text should be plain ascii coming from a trusted source, but to
     // be safe we first strip anything not in safeChars, then add single quotes around
     // the whole string before passing it to the shell:
     std::string singleQuote("'");
-                std::string safeStatus = SanitizeString(strStatusBar);
+    std::string safeStatus = SanitizeString(strMessage);
     safeStatus = singleQuote+safeStatus+singleQuote;
     boost::replace_all(strCmd, "%s", safeStatus);
 
@@ -248,10 +259,4 @@ bool CAlert::ProcessAlert(bool fThread)
         boost::thread t(runCommand, strCmd); // thread runs free
     else
         runCommand(strCmd);
-            }
-        }
-    }
-
-    LogPrint("alert", "accepted alert %d, AppliesToMe()=%d\n", nID, AppliesToMe());
-    return true;
 }

src/alert.h

@@ -101,7 +101,8 @@ public:
     bool AppliesToMe() const;
     bool RelayTo(CNode* pnode) const;
     bool CheckSignature() const;
-    bool ProcessAlert(bool fThread = true);
+    bool ProcessAlert(bool fThread = true); // fThread means run -alertnotify in a free-running thread
+    static void Notify(const std::string& strMessage, bool fThread);
 
     /*
      * Get copy of (active) alert object by hash. Returns a null alert if it is not found.

src/main.cpp

@@ -1177,15 +1177,10 @@ void CheckForkWarningConditions()
     if (pindexBestForkTip || (pindexBestInvalid && pindexBestInvalid->nChainWork > chainActive.Tip()->nChainWork + (chainActive.Tip()->GetBlockWork() * 6)))
     {
         if (!fLargeWorkForkFound)
-        {
-            std::string strCmd = GetArg("-alertnotify", "");
-            if (!strCmd.empty())
         {
             std::string warning = std::string("'Warning: Large-work fork detected, forking after block ") +
                 pindexBestForkBase->phashBlock->ToString() + std::string("'");
-                boost::replace_all(strCmd, "%s", warning);
-                boost::thread t(runCommand, strCmd); // thread runs free
-            }
+            CAlert::Notify(warning, true);
         }
         if (pindexBestForkTip)
         {