CChan: keep track of the state

Make CChan keep track of the channel key, and schedule saving of the
config file when appropriate. This is more robust than trying to do
it from within the chansaver module.

include/znc/Chan.h

@@ -110,7 +110,7 @@ public:
 	// Setters
 	void SetModeKnown(bool b) { m_bModeKnown = b; }
 	void SetIsOn(bool b) { m_bIsOn = b; if (!b) { Reset(); } }
-	void SetKey(const CString& s) { m_sKey = s; }
+	void SetKey(const CString& s);
 	void SetTopic(const CString& s) { m_sTopic = s; }
 	void SetTopicOwner(const CString& s) { m_sTopicOwner = s; }
 	void SetTopicDate(unsigned long u) { m_ulTopicDate = u; }
@@ -118,7 +118,7 @@ public:
 	void SetAutoClearChanBuffer(bool b);
 	void InheritAutoClearChanBuffer(bool b);
 	void SetDetached(bool b = true) { m_bDetached = b; }
-	void SetInConfig(bool b) { m_bInConfig = b; }
+	void SetInConfig(bool b);
 	void SetCreationDate(unsigned long u) { m_ulCreationDate = u; }
 	void Disable() { m_bDisabled = true; }
 	void Enable();

src/Chan.cpp

@@ -19,6 +19,7 @@
 #include <znc/User.h>
 #include <znc/IRCNetwork.h>
 #include <znc/Config.h>
+#include <znc/znc.h>
 
 using std::set;
 using std::vector;
@@ -364,6 +365,13 @@ void CChan::ModeChange(const CString& sModes, const CNick* pOpNick) {
 			if (!bList) {
 				(bAdd) ? AddMode(uMode, sArg) : RemMode(uMode);
 			}
+
+			// This is called when we join (ZNC requests the channel modes
+			// on join) *and* when someone changes the channel keys.
+			// We ignore channel key "*" because of some broken nets.
+			if (uMode == 'k' && !bNoChange && bAdd && sArg != "*") {
+				SetKey(sArg);
+			}
 		}
 	}
 }
@@ -623,3 +631,21 @@ void CChan::Enable() {
 	ResetJoinTries();
 	m_bDisabled = false;
 }
+
+void CChan::SetKey(const CString& s) {
+	if (m_sKey != s) {
+		m_sKey = s;
+		if (m_bInConfig) {
+			CZNC::Get().SetConfigState(CZNC::ECONFIG_NEED_WRITE);
+		}
+	}
+}
+
+void CChan::SetInConfig(bool b) {
+	if (m_bInConfig != b) {
+		m_bInConfig = b;
+		if (m_bInConfig) {
+			CZNC::Get().SetConfigState(CZNC::ECONFIG_NEED_WRITE);
+		}
+	}
+}