Fix #191: ZNC < 0.090 does not support IsIRCAway()

To maintain compatibility with ZNC < 0.090 (such as 0.078 used by
Ubuntu), we need to conditionally disable the away_only condition when
compiled against versions that don't support CUser->IsIRCAway().

README.md

@@ -9,6 +9,11 @@ for everyday usage.  Users are more than welcome to submit feature requests or p
 discussion or inclusion.  Bug reports and feature requests can be submitted to
 [my bug tracker][mantis] or sent via email.
 
+For full functionality, this module requires ZNC version 0.090 or newer, but should compile
+and run with a reduced feature set on versions as old as 0.078, the current version used by
+Ubuntu.  However, development and testing is done exclusively against the latest source
+distribution, so feedback on older releases of ZNC is needed to continue supporting them.
+
 ZNC to Notifo was created by [John Reese](http://johnmreese.com) and designed to fill a
 personal need.  It may not fit your use cases, but any and all feedback would be greatly
 appreciated.
@@ -17,6 +22,12 @@ appreciated.
 Compiling
 ---------
 
+If you have installed ZNC from a Linux distribution's repository, you will most likely
+need to install the development package before building this module.  On Ubuntu, this can
+be installed with:
+
+    $ sudo aptitude install znc-dev
+
 If you have `make` installed, you can compile the module with:
 
     $ make
@@ -86,6 +97,9 @@ Configuration
 
     If set to "yes", notifications will only be sent if the user has set their `/away` status.
 
+    This condition requires version 0.090 of ZNC to operate, and will be disabled when
+    compiled against older versions.
+
 *   `client_count_less_than = 0`
 
     Notifications will only be sent if the number of connected IRC clients is less than this

notifo.cpp

@@ -20,6 +20,11 @@
 #error This module needs ZNC 0.072 or newer.
 #endif
 
+// Handle versions of ZNC older than 0.090 by disabling the away_only condition
+#if VERSION_MAJOR == 0 && VERSION_MINOR >= 90
+#define NOTIFO_AWAY
+#endif
+
 class CNotifoMod : public CModule
 {
 	protected:
@@ -76,7 +81,9 @@ class CNotifoMod : public CModule
 			defaults["secret"] = "";
 
 			// Notification conditions
+#ifdef NOTIFO_AWAY
 			defaults["away_only"] = "no";
+#endif
 			defaults["client_count_less_than"] = "0";
 			defaults["idle"] = "0";
 			defaults["last_active"] = "180";
@@ -168,8 +175,12 @@ class CNotifoMod : public CModule
 		 */
 		bool away_only()
 		{
+#ifdef NOTIFO_AWAY
 			CString value = options["away_only"].AsLower();
 			return value != "yes" || user->IsIRCAway();
+#else
+			return true
+#endif
 		}
 
 		/**
@@ -612,9 +623,11 @@ class CNotifoMod : public CModule
 				table.AddColumn("Condition");
 				table.AddColumn("Status");
 
+#ifdef NOTIFO_AWAY
 				table.AddRow();
 				table.SetCell("Condition", "away");
 				table.SetCell("Status", user->IsIRCAway() ? "yes" : "no");
+#endif
 
 				table.AddRow();
 				table.SetCell("Condition", "client_count");