Add a Cocoa frontend for xC

Some work remains to be done to get it to be even as good
as the Win32 frontend, but it's generally usable.

NEWS

@@ -33,6 +33,8 @@
 
  * Added a Win32 frontend for xC called xW
 
+ * Added a Cocoa frontend for xC called xM
+
  * Added a Go port of xD called xS
 
 

README.adoc

@@ -2,8 +2,9 @@ xK
 ==
 
 'xK' (chat kit) is an IRC software suite consisting of a daemon, bot, terminal
-client, and web + Win32 frontends for the client.  It's all you're ever going to
+client, and web/Windows/macOS frontends for the client.  It's all you're ever
-need for chatting, so long as you can make do with slightly minimalist software.
+going to need for chatting, so long as you can make do with slightly minimalist
+software.
 
 They're all lean on dependencies, and offer a maximally permissive licence.
 
@@ -140,13 +141,23 @@ endpoint as the third command line argument in this case.
 xW
 ~~
 The Win32 frontend is a separate CMake subproject that should be compiled
-using MinGW-w64.  In order to run it, make a shortcut for the executable and
+using MinGW-w64.  To avoid having to specify the relay address each time you
-include the relay address in its _Target_ field:
+run it, create a shortcut for the executable and include the address in its
+_Target_ field:
 
  C:\...\xW.exe 127.0.0.1 9000
 
 It works reasonably well starting with Windows 7.
 
+xM
+~~
+The Cocoa frontend is a separate CMake subproject that requires Xcode to build.
+It is currently not that usable.  The relay address can either be passed on
+the command line, or preset in the _defaults_ database:
+
+ $ defaults write name.janouch.xM relayHost 127.0.0.1
+ $ defaults write name.janouch.xM relayPort 9000
+
 Client Certificates
 -------------------
 'xC' will use the SASL EXTERNAL method to authenticate using the TLS client

xM/CMakeLists.txt

@@ -0,0 +1,32 @@
+# Swift language support
+cmake_minimum_required (VERSION 3.15)
+
+file (READ ../xK-version project_version)
+configure_file (../xK-version xK-version.tag COPYONLY)
+string (STRIP "${project_version}" project_version)
+
+# There were two issues when building this from the main CMakeLists.txt:
+# a) renaming main.swift to xM.swift requires removing top-level statements,
+# b) there is a "redefinition of module 'FFI'" error.
+project (xM VERSION "${project_version}"
+	DESCRIPTION "Cocoa frontend for xC" LANGUAGES Swift)
+
+set (root "${PROJECT_SOURCE_DIR}/..")
+add_custom_command (OUTPUT xC-proto.swift
+	COMMAND env LC_ALL=C awk
+		-f ${root}/liberty/tools/lxdrgen.awk
+		-f ${root}/liberty/tools/lxdrgen-swift.awk
+		-v PrefixCamel=Relay
+		${root}/xC.lxdr > xC-proto.swift
+	DEPENDS
+		${root}/liberty/tools/lxdrgen.awk
+		${root}/liberty/tools/lxdrgen-swift.awk
+		${root}/xC.lxdr
+	COMMENT "Generating xC relay protocol code" VERBATIM)
+
+set (MACOSX_BUNDLE_GUI_IDENTIFIER name.janouch.${PROJECT_NAME})
+
+# Other requirements: macOS 10.14 for Network, and macOS 11 for Logger.
+set (CMAKE_Swift_LANGUAGE_VERSION 5)
+add_executable (xM MACOSX_BUNDLE
+	main.swift ${PROJECT_BINARY_DIR}/xC-proto.swift)