use .env and not environment variable for VERSION

Author: jordan-evens

.env

@@ -0,0 +1 @@
+VERSION=0.9.5.6

CMakeLists.txt

@@ -118,25 +118,29 @@ else()
 endif()
 message("CMAKE_CXX_FLAGS = ${CMAKE_CXX_FLAGS}")
 
-set(VERSION $ENV{VERSION})
-if ("${VERSION}" STREQUAL "")
+# HACK: look for version in parent folder .env
+if(EXISTS ".env")
+  execute_process(COMMAND git log -n1 --pretty=%h .env OUTPUT_STRIP_TRAILING_WHITESPACE OUTPUT_VARIABLE HASH_ENV)
+  file(STRINGS ".env" CONFIG REGEX "^[ ]*[A-Za-z0-9_]+[ ]*=")
+  list(TRANSFORM CONFIG STRIP)
+  list(TRANSFORM CONFIG REPLACE "([^=]+)=[ ]*(.*)" "set(\\1 \"\\2\")\n")
+  message(${CONFIG})
+  cmake_language(EVAL CODE ${CONFIG})
+  message("Parsed config")
+else()
   message(WARNING "VERSION IS NOT SET")
-  # HACK: look for version in parent folder .env
-  if(EXISTS "../.env")
-    file(STRINGS "../.env" CONFIG REGEX "^[ ]*[A-Za-z0-9_]+[ ]*=")
-    list(TRANSFORM CONFIG STRIP)
-    list(TRANSFORM CONFIG REPLACE "([^=]+)=[ ]*(.*)" "set(\\1 \"\\2\")\n")
-    message(${CONFIG})
-    cmake_language(EVAL CODE ${CONFIG})
-    message("Parsed config")
-  else()
-    # no version set
-    set(VERSION "?.?.?.?")
-  endif()
+  # no version set
+  set(VERSION "?.?.?.?")
 endif()
 
 execute_process(COMMAND git rev-parse --short --verify HEAD OUTPUT_STRIP_TRAILING_WHITESPACE OUTPUT_VARIABLE HASH)
 execute_process(COMMAND git diff-index --quiet HEAD RESULT_VARIABLE GIT_CHANGED)
+
+if (NOT "${HASH_ENV}" STREQUAL "${HASH}")
+  # add + to version if .env isn't from current commit
+  set(VERSION "${VERSION}+")
+endif()
+
 set(MODIFIED_TIME "")
 
 message("Compiler is ${CMAKE_CXX_COMPILER}")