icon: Add convert.py for Android Adaptive Icons

Android Adaptive Icons allow the OS to display the icon in different
variations and styles.

For this to work Android requires PNG images with e.g. only the
foreground or only the background.

The added script can generate these files from main.svg.

[1]: https://developer.android.com/develop/ui/views/launch/icon_design_adaptive

2 files changed, 74 insertions, 2 deletions

diff --git a/check.py b/check.py
index 858309c..9c45f4d 100755
--- a/check.py
+++ b/check.py
@@ -6,9 +6,9 @@ import subprocess
 import shutil
 import sys
 
-
 SCRIPT = pathlib.Path(__file__).resolve()
 ROOT = SCRIPT.parent
+ICON = ROOT / "icon"
 
 
 def main() -> None:
@@ -67,7 +67,13 @@ def black() -> None:
 
 
 def get_python_files() -> tuple[pathlib.Path, ...]:
-    return tuple(ROOT.glob("*.py"))
+    files: list[pathlib.Path] = []
+
+    for directory in (ROOT, ICON):
+        for file in directory.glob("*.py"):
+            files.append(file)
+
+    return tuple(files)
 
 
 def flutter_analyze() -> None:
diff --git a/icon/convert.py b/icon/convert.py
new file mode 100755
index 0000000..b550709
--- /dev/null
+++ b/icon/convert.py
@@ -0,0 +1,66 @@
+#!/usr/bin/env python3
+
+
+import argparse
+import dataclasses
+import os
+import pathlib
+import subprocess
+import sys
+
+DESCRIPTION = "Script to convert main icon file to all required formats"
+SCRIPT = pathlib.Path(__file__).resolve()
+ICON = SCRIPT.parent
+MAIN = ICON / "main.svg"
+ANDROID = ICON / "android"
+
+
+def main() -> None:
+    _ = Arguments.from_list(sys.argv)
+
+    os.makedirs(ANDROID, exist_ok=True)
+    inkscape(MAIN, ANDROID / "default.png")
+    inkscape(MAIN, ANDROID / "foreground.png", ids=("foreground",))
+    inkscape(MAIN, ANDROID / "background.png", ids=("background",))
+
+
+@dataclasses.dataclass(frozen=True, kw_only=True)
+class Arguments:
+
+    @staticmethod
+    def from_list(args: list[str]) -> "Arguments":
+        parser = argparse.ArgumentParser(description=DESCRIPTION)
+
+        parser.parse_args(args[1:])
+
+        return Arguments()
+
+
+def inkscape(
+    source: pathlib.Path,
+    sink: pathlib.Path,
+    ids: tuple[str, ...] = ("foreground", "background"),
+    width: int = 1024,
+    height: int = 1024,
+) -> None:
+    subprocess.run(
+        (
+            # fmt: off
+            "inkscape", str(source),
+            "--export-filename", str(sink),
+            "--export-area-page",
+            "--export-id", ";".join(ids),
+            "--export-width", str(width),
+            "--export-height", str(height),
+            "--export-id-only",
+            # fmt: on
+        ),
+        check=True,
+        shell=False,
+        stdout=subprocess.DEVNULL,
+        stderr=subprocess.DEVNULL,
+    )
+
+
+if __name__ == "__main__":
+    main()