build: Added option for Offline builds

CMakeLists.txt

@@ -10,6 +10,8 @@ set(IMHEX_BASE_FOLDER ${CMAKE_CURRENT_SOURCE_DIR})
 set(CMAKE_MODULE_PATH "${IMHEX_BASE_FOLDER}/cmake/modules")
 include("${IMHEX_BASE_FOLDER}/cmake/build_helpers.cmake")
 
+option(IMHEX_OFFLINE_BUILD "Enable offline build" OFF)
+
 # Make sure project is configured correctly
 setDefaultBuiltTypeIfUnset()
 detectBadClone()

cmake/build_helpers.cmake

@@ -290,6 +290,7 @@ endmacro()
 
 
 function(downloadImHexPatternsFiles dest)
+    if (NOT IMHEX_OFFLINE_BUILD)
         FetchContent_Declare(
             imhex_patterns
             GIT_REPOSITORY https://github.com/WerWolv/ImHex-Patterns.git
@@ -301,6 +302,7 @@ function(downloadImHexPatternsFiles dest)
         set(PATTERNS_FOLDERS_TO_INSTALL constants encodings includes patterns magic)
         foreach (FOLDER ${PATTERNS_FOLDERS_TO_INSTALL})
             install(DIRECTORY "${imhex_patterns_SOURCE_DIR}/${FOLDER}" DESTINATION ${dest})
-    endforeach()
+        endforeach ()
+    endif ()
 
 endfunction()