Enhancement - Hooks

- Multiple hooks for the same event are now triggered, in the sequence
  they are found in .taskrc
- Program hooks can now cause task to exit.

src/API.cpp

@@ -490,10 +490,9 @@ bool API::callProgramHook (
     throw std::string ("Error calling '") + function + "' - " + lua_tostring (L, -1);
 
   // Call successful - get return values.
-  // 0, nil    -> success
-  // 0, string -> warning
-  // 1, string -> error
   if (!lua_isnumber (L, -2)) throw std::string ("Error: '") + function + "' did not return a success indicator";
+
+// TODO This doesn't seem to know that 'nil' was returned instead of a string.
 //  if (!lua_isstring (L, -1)) throw std::string ("Error: '") + function + "' did not return a message";
 
   int rc              = lua_tointeger (L, -2);
@@ -507,7 +506,7 @@ bool API::callProgramHook (
   else
   {
     if (message)
-      throw std::string ("Error: ") + message;
+      throw std::string (message);
   }
 
   lua_pop (L, 1);

src/Context.cpp

@@ -194,8 +194,7 @@ int Context::dispatch (std::string &out)
 
   Timer t ("Context::dispatch");
 
-  if (! hooks.trigger ("pre-dispatch"))
-    return rc;
+  hooks.trigger ("pre-dispatch");
 
   // TODO Just look at this thing.  It cries out for a dispatch table.
        if (cmd.command == "projects")      { rc = handleProjects           (out); }

src/Hooks.cpp

@@ -101,17 +101,22 @@ bool Hooks::trigger (const std::string& event)
   {
     if (it->event == event)
     {
+      bool rc = true;
       std::string type;
       if (eventType (event, type))
       {
         // TODO Figure out where to get the calling-context info from.
-             if (type == "program") return api.callProgramHook (it->file, it->function);
-        else if (type == "list")    return api.callListHook    (it->file, it->function/*, tasks*/);
-        else if (type == "task")    return api.callTaskHook    (it->file, it->function, 0);
-        else if (type == "field")   return api.callFieldHook   (it->file, it->function, "field", "value");
+             if (type == "program") rc = api.callProgramHook (it->file, it->function);
+        else if (type == "list")    rc = api.callListHook    (it->file, it->function/*, tasks*/);
+        else if (type == "task")    rc = api.callTaskHook    (it->file, it->function, 0);
+        else if (type == "field")   rc = api.callFieldHook   (it->file, it->function, "field", "value");
       }
       else
         throw std::string ("Unrecognized hook event '") + event + "'";
+
+      // If any hook returns false, stop.
+      if (!rc)
+        return false;
     }
   }
 #endif