Add support for a fixed_irc_server configuration

This option lets the administrator choose a specific IRC server, and only
that server can be used with this biboumi instance.

In this mode, JIDs to use are changed like this:

- #chan%irc.example.com@biboumi.example.com      -> #chan@biboumi.example.com
- user!irc.example.com@biboumi.example.com       -> user!@biboumi.example.com
- #chan%irc.example.com@biboumi.example.com/Nick -> #chan@biboumi.example.com/Nick
- %irc.example.com@biboumi.example.com           -> no equivalent
- irc.example.com@biboumi.example.com            -> no equivalent

1 files changed, 8 insertions, 0 deletions

diff --git a/src/utils/empty_if_fixed_server.cpp b/src/utils/empty_if_fixed_server.cpp
new file mode 100644
index 0000000..85fd86d
--- /dev/null
+++ b/src/utils/empty_if_fixed_server.cpp
@@ -0,0 +1,8 @@
+// #include <utils/empty_if_fixed_server.hpp>
+
+// #include <config/config.hpp>
+
+// namespace utils
+// {
+//   inline std::string empty_if_fixed_server(std::string&& str)
+// }