Merge branch 'feature_updater' into develop

122 files changed, 45858 insertions, 55 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 11b64c3d..6dbd2371 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -97,6 +97,9 @@ include_directories(${LIBSETTINGS_INCLUDE_DIR})
 add_subdirectory(depends/groupview)
 include_directories(${LIBGROUPVIEW_INCLUDE_DIR})
 
+# Add the updater
+add_subdirectory(mmc_updater)
+
 ################################ SET UP BUILD OPTIONS ################################
 
 ######## Check endianness ########
@@ -115,24 +118,54 @@ SET(MultiMC_VERSION_MINOR		0)
 SET(MultiMC_VERSION_BUILD -1 CACHE STRING "Build number. -1 for no build number.")
 
 # Build type
-SET(MultiMC_VERSION_BUILD_TYPE "custombuild" CACHE STRING "Build type. Usually corresponds to the buildbot build name. Empty string for no build type.")
+SET(MultiMC_VERSION_BUILD_TYPE "custombuild" CACHE STRING "Build type. If this is set, it is appended to the end of the version string with a dash (<version string>-<build type>. It is not used for anything other than indicating in the version string what type of build this is (eg 'lin64').")
 
-SET(MultiMC_VERSION_STRING "${MultiMC_VERSION_MAJOR}.${MultiMC_VERSION_MINOR}")
+# Version channel
+SET(MultiMC_VERSION_CHANNEL "" CACHE STRING "The current build's channel. Included in the version string.")
+
+# Channel list URL
+SET(MultiMC_CHANLIST_URL "" CACHE STRING "URL for the channel list.")
 
+# Updater enabled?
+SET(MultiMC_UPDATER false CACHE BOOL "Whether or not the update system is enabled. If this is enabled, you must also set MultiMC_CHANLIST_URL and MultiMC_VERSION_CHANNEL in order for it to work properly.")
+
+
+# Build a version string to display in the configure logs.
+SET(MultiMC_VERSION_STRING "${MultiMC_VERSION_MAJOR}.${MultiMC_VERSION_MINOR}")
 IF (MultiMC_VERSION_BUILD GREATER -1)
 	SET(MultiMC_VERSION_STRING "${MultiMC_VERSION_STRING}.${MultiMC_VERSION_BUILD}")
 ENDIF ()
-
+IF (NOT MultiMC_VERSION_CHANNEL STREQUAL "")
+	SET(MultiMC_VERSION_STRING "${MultiMC_VERSION_STRING}-${MultiMC_VERSION_CHANNEL}")
+ENDIF ()
 IF (NOT MultiMC_VERSION_BUILD_TYPE STREQUAL "")
 	SET(MultiMC_VERSION_STRING "${MultiMC_VERSION_STRING}-${MultiMC_VERSION_BUILD_TYPE}")
 ENDIF ()
 
 MESSAGE(STATUS "MultiMC 5 version ${MultiMC_VERSION_STRING}")
 
-# Custom target to just print the version.
+# If the update system is enabled, make sure MultiMC_CHANLIST_URL and MultiMC_VERSION_CHANNEL are set.
+IF (MultiMC_UPDATER)
+	IF (MultiMC_VERSION_CHANNEL STREQUAL "")
+		MESSAGE(FATAL_ERROR "Update system is enabled, but MultiMC_VERSION_CHANNEL is not set.\n"
+							"Please ensure the CMake variables MultiMC_VERSION_CHANNEL, MultiMC_CHANLIST_URL, and MultiMC_VERSION_BUILD are set.")
+	ENDIF ()
+	IF (MultiMC_CHANLIST_URL STREQUAL "")
+		MESSAGE(FATAL_ERROR "Update system is enabled, but MultiMC_CHANLIST_URL is not set.\n"
+							"Please ensure the CMake variables MultiMC_VERSION_CHANNEL, MultiMC_CHANLIST_URL, and MultiMC_VERSION_BUILD are set.")
+	ENDIF ()
+	IF (MultiMC_VERSION_BUILD LESS 0)
+		MESSAGE(FATAL_ERROR "Update system is enabled, but MultiMC_VERSION_BUILD is not set.\n"
+							"Please ensure the CMake variables MultiMC_VERSION_CHANNEL, MultiMC_CHANLIST_URL, and MultiMC_VERSION_BUILD are set.")
+	ENDIF ()
+
+	MESSAGE(STATUS "Updater is enabled. Channel list URL: ${MultiMC_CHANLIST_URL}")
+ENDIF ()
+
+#### Custom target to just print the version.
 ADD_CUSTOM_TARGET(version echo "Version: ${MultiMC_VERSION_STRING}")
 
-# Check the current Git commit
+#### Check the current Git commit
 execute_process(COMMAND git rev-parse HEAD
 	WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
 	RESULT_VARIABLE GIT_COMMIT_CHECK_RESULTVAR