build: add script to rewrite git submodules

.repo/rewrite-gitmodules

@@ -0,0 +1,58 @@
+#!/usr/bin/python
+
+from typing import List
+from typing import Tuple
+import configparser
+import sys
+
+#def add_modules(
+#    modules: List[Tuple[str, str]],
+#    parser: configparser.ConfigParser,
+#) -> None:
+#    """Add set of submodules to gitconfig structure."""
+#    for module in modules:
+#        path, url = module
+#        section = f"submodule \"{path}\""
+#        parser.add_section(section)
+#        parser.set(section, "\tpath", path)
+#        parser.set(section, "\turl", url)
+
+parser = configparser.ConfigParser()
+parser.read(".gitmodules")
+
+packages = []
+other = []
+
+for section in parser:
+    # skip default section, it's useless
+    if section == "DEFAULT":
+        continue
+
+    # extract path & url
+    path = parser.get(section, "path")
+    url = parser.get(section, "url")
+
+    # i've got access to the package, must be one of mine
+    if url.startswith("ssh://"):
+        packages.append((path, url))
+    # no idea who this belongs to
+    elif url.startswith("https://"):
+        other.append((path, url))
+
+# sort modules alphabetically
+packages.sort()
+other.sort()
+
+def write_packages(packages, f):
+    for package in packages:
+        path, url = package
+        section = f"[submodule \"{path}\"]"
+
+        f.write(f"{section}\n")
+        f.write(f"\tpath = {path}\n")
+        f.write(f"\turl = {url}\n")
+
+# rewrite gitmodules
+with open(".gitmodules", "w") as f:
+    write_packages(packages, f)
+    write_packages(other, f)