feat(core): add basic listener to check for a chat command

TODO: authorization module
Signed-off-by: zontreck <tarapiccari@gmail.com>

src/includes/Functions.lsl

@@ -77,3 +77,13 @@ integer VersionNumberCompare(string sInput, string sCompare)
 /*
 END VERSION CODE
 */
+
+
+string getDefaultPrefix() {
+    string ret = "";
+    string ownerName = llGetUsername(llGetOwner());
+
+    ret = llToLower(llGetSubString(ownerName, 0, 1));
+
+    return ret;
+}

src/includes/Variables.lsl

@@ -66,6 +66,8 @@ key g_kSession;
 string g_sBOM;
 
 integer g_iLocked;
+integer g_iListenZero;
+string g_sPrefix;
 
 
 string UPDATER_SHIM = "NuUpdate Shim [AC]";

src/raw/core.lsl

@@ -9,6 +9,8 @@ default
     state_entry()
     {
         LM(LINK_SIGNAL_CALLBACKS, OP_CALLBACK_CHECK_STATUS, EMPTY_JSON);
+
+        g_iListenZero = llListen(0, "", "", "");
     }
 
     link_message(integer iSender, integer iNum, string sMsg, key kID)
@@ -36,6 +38,8 @@ default
                     if(sNamespace == "global") {
                         if(sKey == "locked") {
                             g_iLocked = (integer)sVal;
+                        } else if(sKey == "prefix") {
+                            g_sPrefix = sVal;
                         }
                     }
                     break;
@@ -43,4 +47,29 @@ default
             }
         }
     }
+
+    listen(integer iChannel, string sName, key kID, string sMsg)
+    {
+        if(g_sPrefix == "") {
+            g_sPrefix = getDefaultPrefix();
+            LM(LINK_SIGNAL_SETTINGS, OP_SETTINGS_WRITE, ["key", "global_prefix", "value", g_sPrefix]);
+        }
+
+        integer iCommand =0;
+
+        if(llGetSubString(sMsg,1,2) == g_sPrefix && llGetSubString(sMsg, 0,0) == "*") {
+            // Likely is a command
+            // We prepend an asterisk to make sure a command is intended to be a command, and not normal text
+            iCommand=1;
+        } else if(llGetSubString(sMsg, 1,2) == "**" && llGetSubString(sMsg,0,0) == "*") { 
+            // Three stars is a wildcard
+
+            iCommand=1;
+        }
+
+        if(!iCommand) return;
+
+        // TODO: Check user authorization
+        
+    }
 }