fix tilde expansion: add windows support

Author: de-ep

cmake/cmkr.cmake

@@ -62,7 +62,11 @@ if(DEFINED ENV{CMKR_CACHE})
     set(CMKR_DIRECTORY_PREFIX "$ENV{CMKR_CACHE}")
     string(REPLACE "\\" "/" CMKR_DIRECTORY_PREFIX "${CMKR_DIRECTORY_PREFIX}")
     if(CMKR_DIRECTORY_PREFIX MATCHES "^~")
-        string(REGEX REPLACE "^~" "$ENV{HOME}" CMKR_DIRECTORY_PREFIX "${CMKR_DIRECTORY_PREFIX}")
+        if(WIN32)
+            string(REGEX REPLACE "^~" "$ENV{USERPROFILE}" CMKR_DIRECTORY_PREFIX "${CMKR_DIRECTORY_PREFIX}")
+        elseif(UNIX) 
+            string(REGEX REPLACE "^~" "$ENV{HOME}" CMKR_DIRECTORY_PREFIX "${CMKR_DIRECTORY_PREFIX}")
+        endif()
     endif()
     if(NOT CMKR_DIRECTORY_PREFIX MATCHES "\\/$")
         set(CMKR_DIRECTORY_PREFIX "${CMKR_DIRECTORY_PREFIX}/")