Respect UV_CACHE_DIR and cache-dir (#612)

Fixes: #583

src/utils/config-file.ts

@@ -0,0 +1,24 @@
+import fs from "node:fs";
+import * as toml from "smol-toml";
+
+export function getConfigValueFromTomlFile(
+  filePath: string,
+  key: string,
+): string | undefined {
+  if (!fs.existsSync(filePath) || !filePath.endsWith(".toml")) {
+    return undefined;
+  }
+  const fileContent = fs.readFileSync(filePath, "utf-8");
+
+  if (filePath.endsWith("pyproject.toml")) {
+    const tomlContent = toml.parse(fileContent) as {
+      tool?: { uv?: Record<string, string | undefined> };
+    };
+    return tomlContent?.tool?.uv?.[key];
+  }
+  const tomlContent = toml.parse(fileContent) as Record<
+    string,
+    string | undefined
+  >;
+  return tomlContent[key];
+}