#!/bin/sh
#
# plow.sh — one command, any box: fetch the right plow for this OS and run
# it, arguments forwarded. This is the ~20-line selector served at the root
# of get.smolnerd.ai; the per-OS scripts it fetches are directly readable:
#
#   https://get.smolnerd.ai/mac      (plow-macos.zsh)
#   https://get.smolnerd.ai/linux    (plow-linux.sh)
#
#   curl -fsSL https://get.smolnerd.ai | sh            # zero args = prompt
# (the selector announces and performs the one sudo itself)
#
# © Fork Development Corp. The plow is free to run — it only makes a
# dedicated user account (the fence). The Smol Nerd it prepares for is
# licensed software; install.sh is the gate.

set -u
BASE="${PLOW_BASE:-https://get.smolnerd.ai}"   # .farm 301s here

case "$(uname -s)" in
  Darwin) url="$BASE/mac";   interp=zsh  ;;
  Linux)  url="$BASE/linux"; interp=bash ;;
  *) echo "plow: unsupported OS: $(uname -s)" >&2; exit 1 ;;
esac
command -v "$interp" >/dev/null 2>&1 || { echo "plow: $interp not found" >&2; exit 1; }

t=$(mktemp) || exit 1
if ! curl -fsSL "$url" > "$t"; then
  echo "plow: fetch failed: $url" >&2; rm -f "$t"; exit 1
fi
want_sudo=1
for _a in "$@"; do case "$_a" in -h|--help) want_sudo=0 ;; esac; done
if [ "$want_sudo" = "1" ] && [ "$(id -u)" != "0" ] && command -v sudo >/dev/null 2>&1; then
  echo "==> the plow needs root for its one step — sudo will ask:" >&2
  sudo "$interp" "$t" "$@"; rc=$?
else
  "$interp" "$t" "$@"; rc=$?
fi
rm -f "$t"
exit $rc