Make appveyor able to inject git commit into version

.appveyor.yml

@@ -26,6 +26,7 @@ clone_depth: 1
 
 init:
   - set TAG_NAME=%APPVEYOR_REPO_TAG_NAME%
+  - python ./build_scripts/append_to_version_file.py $(APPVEYOR_REPO_COMMIT) > ./build_scripts/compile_version_string.txt
 
 build_script:
   - python ./build_scripts/run-clang-format.py ./src -r --clang-format-executable "C:\Program Files\LLVM\bin\clang-format.exe" --color always

build_scripts/append_to_version_file.py

@@ -0,0 +1,13 @@
+from sys import argv
+from os import path
+
+def get_version_string():
+    dir_path = path.dirname(path.realpath(__file__))
+    with open(dir_path + "/compile_version_string.txt", "r") as file:
+        contents = file.readline()
+        return contents.strip('"')    
+    
+if __name__ == "__main__":
+    current_version = get_version_string()
+    new_version = current_version + "-" + argv[1]
+    print("\"" + new_version + "\"")