Rewrite the whole IID usage

IRC users and channels are now distinguished by the separator used in the
IID (% or !).

ref #2468

src/irc/iid.cpp

@@ -1,21 +1,63 @@
+#include <utils/tolower.hpp>
+
 #include <irc/iid.hpp>
 
-Iid::Iid(const std::string& iid)
+Iid::Iid(const std::string& iid):
+  is_channel(false),
+  is_user(false)
 {
-  std::string::size_type sep = iid.find("%");
+  const std::string::size_type sep = iid.find_first_of("%!");
   if (sep != std::string::npos)
     {
-      this->chan = iid.substr(0, sep);
-      sep++;
+      if (iid[sep] == '%')
+        this->is_channel = true;
+      else
+        this->is_user = true;
+      this->set_local(iid.substr(0, sep));
+      this->set_server(iid.substr(sep + 1));
     }
   else
-    {
-      this->chan = iid;
-      return;
-    }
-  this->server = iid.substr(sep);
+    this->set_server(iid);
 }
 
-Iid::Iid()
+Iid::Iid():
+  is_channel(false),
+  is_user(false)
 {
 }
+
+void Iid::set_local(const std::string& loc)
+{
+  this->local = utils::tolower(loc);
+}
+
+void Iid::set_server(const std::string& serv)
+{
+  this->server = utils::tolower(serv);
+}
+
+const std::string& Iid::get_local() const
+{
+  return this->local;
+}
+
+const std::string& Iid::get_server() const
+{
+  return this->server;
+}
+
+std::string Iid::get_sep() const
+{
+  if (this->is_channel)
+    return "%";
+  else if (this->is_user)
+    return "!";
+  return "";
+}
+
+namespace std {
+  const std::string to_string(const Iid& iid)
+  {
+    return iid.get_local() + iid.get_sep() + iid.get_server();
+  }
+}