[WIP] Updater plugin

Author: solemnwarning

Makefile

@@ -178,7 +178,7 @@ all: $(EXE)
 check: $(TEST_EXE)
 	$(TEST_EXE)
 
-	for p in $(PLUGINS); \
+	for p in $(filter-out updater,$(PLUGINS)) updater; \
 	do \
 		$(MAKE) -C plugins/$${p} LUA=$(LUA) check || exit $$?; \
 	done

plugins/updater/Makefile

@@ -0,0 +1,64 @@
+# Application Updater plugin for REHex
+# Copyright (C) 2025 Daniel Collins <[email protected]>
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License version 2 as published by
+# the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program; if not, write to the Free Software Foundation, Inc., 51
+# Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+INSTALL_FILES := \
+	json.lua \
+	updater.lua
+
+prefix      ?= /usr/local
+exec_prefix ?= $(prefix)
+bindir      ?= $(exec_prefix)/bin
+datarootdir ?= $(prefix)/share
+libdir      ?= $(exec_prefix)/lib
+
+LUA ?= lua
+
+PLUGIN_NAME := updater
+PLUGINS_INST_DIR ?= $(DESTDIR)$(libdir)/rehex
+
+ifeq ($(BUSTED),)
+	# LuaRocks under MinGW doesn't install busted under a bin/ directory - it sticks it
+	# elsewhere and puts a .bat that runs it under the right Lua environment for Reasons.
+	
+	BUSTED := $(shell busted --version > /dev/null 2>&1 && echo busted --lua=$(LUA))
+	ifeq ($(BUSTED),)
+		BUSTED := $(shell busted.bat --version > /dev/null 2>&1 && echo busted.bat --lua=$(LUA))
+	endif
+	
+	ifeq ($(BUSTED),)
+		X := $(error Neither busted or busted.bat found in PATH)
+	endif
+endif
+
+.PHONY: all
+all:
+
+.PHONY: check
+check:
+	$(BUSTED) .
+
+.PHONY: install
+install:
+	for f in $(INSTALL_FILES); \
+	do \
+		mkdir -p $(PLUGINS_INST_DIR)/$(PLUGIN_NAME)/`dirname $${f}`; \
+		install -m 0644 $${f} $(PLUGINS_INST_DIR)/$(PLUGIN_NAME)/$${f}; \
+	done
+
+.PHONY: uninstall
+uninstall:
+	rm -f $(addprefix $(PLUGINS_INST_DIR)/$(PLUGIN_NAME)/,$(INSTALL_FILES))
+	rm -df $(PLUGINS_INST_DIR)/$(PLUGIN_NAME)/