Switch the resolution to be an optional tuple.

.envrc

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+use flake

.gitignore

@@ -1,2 +1,3 @@
+.direnv/
 # Don't include rendered JPEGs and PNGs in git.
 public/**/*.png

flake.lock

@@ -0,0 +1,59 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1705309234,
+        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1705242415,
+        "narHash": "sha256-a8DRYrNrzTudvO7XHUPNJD89Wbf1ZZT0VbwCsPnHWaE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "ea780f3de2d169f982564128804841500e85e373",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,13 @@
+{
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      {
+        devShells.default = import ./shell.nix { inherit pkgs; };
+      }
+    );
+}

render.py

@@ -2,7 +2,7 @@
 
 from pathlib import Path
 from subprocess import run
-from typing import List, Optional
+from typing import List, Optional, Tuple
 
 
 def main() -> None:
@@ -14,8 +14,7 @@ def main() -> None:
                 convert_to_image(
                     source=svg,
                     destination=svg.with_name(f"{svg.stem}-{resolution}.png"),
-                    width=resolution,
-                    height=resolution,
+                    resolution=(resolution, resolution),
                 )
         else:
             convert_to_image(source=svg, destination=svg.with_suffix(".png"))
@@ -24,19 +23,20 @@ def main() -> None:
 def convert_to_image(
     source: Path,
     destination: Path,
-    width: Optional[int] = None,
-    height: Optional[int] = None,
+    resolution: Optional[Tuple[int, int]] = None,
 ) -> None:
+    """Convert an SVG to an image with `inkscape`."""
     inkscape_args: List[str] = ["inkscape", str(source), "-o", str(destination)]
 
-    if width is not None and height is not None:
-        inkscape_args.extend(["-w", str(width), "-h", str(height)])
+    if resolution is not None:
+        inkscape_args.extend(["-w", str(resolution[0]), "-h", str(resolution[1])])
 
     run(args=inkscape_args)
     mat2_image(destination)
 
 
 def mat2_image(image: Path) -> None:
+    """Run `mat2` on the image path."""
     run(args=["mat2", "--inplace", image])
 
 

shell.nix

@@ -0,0 +1,7 @@
+{ pkgs ? import <nixpkgs> { } }:
+
+with pkgs;
+
+mkShell rec {
+  packages = [ inkscape python3 ];
+}