more robust and future-proof architecture

scripts/extract_graphics.py

@@ -0,0 +1,60 @@
+from typing import *
+import os
+import subprocess
+import re
+import sys
+
+
+OUTPUT_DIR: str = "._graphics"
+ID_REGEX: re.Pattern = re.compile("rbk_.*")
+
+
+def get_all_ids(svg_file_name: str) -> List[str]:
+    objects: bytes = subprocess.check_output([
+        "inkscape",
+        "--query-all",
+        svg_file_name,
+    ])
+    return [
+        obj.split(b",")[0].decode("utf-8")
+        for obj in
+        objects.splitlines()
+    ]
+
+
+def id_filter(svg_id: str) -> bool:
+    return ID_REGEX.match(svg_id) is not None
+
+
+def export_objects(svg_file: str, object_ids: Iterable[str]) -> None:
+
+    for obj in object_ids:
+        command = [
+            "inkscape",
+            "--export-type=svg",
+            "--export-plain-svg",
+            "--vacuum-defs",
+            "--export-id-only",
+            "--export-id",
+            obj,
+            "-o",
+            OUTPUT_DIR + "/" + obj[4:],
+            svg_file,
+        ]
+        print(f"exporting {obj[4:]}...", end="")
+        res = subprocess.check_output(command)
+        if res:
+            print(f" An error might have occurred:\n{res}")
+        else:
+            print(" done")
+
+
+if __name__ == "__main__":
+    if not os.path.isdir(OUTPUT_DIR):
+        os.mkdir(OUTPUT_DIR)
+
+    for graphics_file in sys.argv[1:]:
+        export_objects(
+            graphics_file,
+            filter(id_filter, get_all_ids(graphics_file)),
+        )