ci: add functionality to write new versions for lib

ci/version_writer.py

@@ -0,0 +1,38 @@
+#!/usr/bin/python3
+
+import os.path
+import subprocess
+import sys
+
+import version_retriever
+
+
+def update_version(new_version: str, version_file: str):
+    current_version = version_retriever.get_current_version()
+    path_to_version_file = get_absolute_path_to_version_file(version_file)
+    replace_current_with_new_version(current_version, new_version, path_to_version_file)
+
+
+def get_absolute_path_to_version_file(version_file: str):
+    git_repo_root = subprocess.Popen(['git', 'rev-parse', '--show-toplevel'], stdout=subprocess.PIPE) \
+        .communicate()[0] \
+        .rstrip() \
+        .decode('utf-8')
+    path_to_version_file = os.path.join(git_repo_root, version_file)
+    return path_to_version_file
+
+
+def replace_current_with_new_version(current_version, new_version, path_to_version_file):
+    with open(path_to_version_file, "r") as version_file:
+        file_data = version_file.read()
+    updated_file_data = file_data.replace(current_version, new_version)
+    with open(path_to_version_file, "w") as version_file:
+        version_file.write(updated_file_data)
+
+
+if __name__ == "__main__":
+    new_version = sys.argv[1]
+    version_file = "src/roadmapper/version.py"
+    update_version(new_version, version_file)
+
+    print(f"Version in `{version_file}` updated to `{new_version}`")