simplify building (#26)

setup.sh

@@ -1,10 +1,39 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
+# sets up build-time dependencies (NOT runtime dependencies)
+
+run_as_root() {
+  if [ "$(id -u)" -eq 0 ]; then
+    "$@"
+  elif command -v sudo &>/dev/null; then
+    sudo "$@"
+  else
+    echo "error: root privileges required for: $*" >&2
+    exit 1
+  fi
+}
+
 if [ "$(uname)" = "Darwin" ]; then
   brew install nasm pkg-config
 elif command -v dnf &>/dev/null; then
   dnf install -y nasm cmake gcc-c++ pkgconfig git perl-IPC-Cmd
 elif command -v apt-get &>/dev/null; then
-  sudo apt-get update && sudo apt-get install -y nasm cmake g++ pkg-config
+  run_as_root apt-get update
+  run_as_root apt-get install -y nasm cmake g++ pkg-config curl
+fi
+
+if ! command -v uv &>/dev/null; then
+  command -v curl &>/dev/null || {
+    echo "error: curl is required to install uv" >&2
+    exit 1
+  }
+  UV_BIN_DIR="$HOME/.local/bin"
+  mkdir -p "$UV_BIN_DIR"
+  curl -LsSf https://astral.sh/uv/install.sh | env UV_UNMANAGED_INSTALL="$UV_BIN_DIR" sh
+  export PATH="$UV_BIN_DIR:$PATH"
+  command -v uv &>/dev/null || {
+    echo "error: failed to install uv" >&2
+    exit 1
+  }
 fi