#!/usr/bin/env nix-shell
#!nix-shell -p ruby -i ruby

require "shellwords"
ROOT = File.join(__dir__, "..")

def usage()
  puts "Usage: #{$PROGRAM_NAME} [--only-save] <device_name>"
end

# Poor approximation to arguments parsing.
params, other_args = ARGV.partition { |s| s.match(/^--/) }

if other_args.empty?
  $stderr.puts "Device name required."
  usage
  exit 1
end

DEVICE = other_args.shift
FILE = Dir.glob(File.join(ROOT, "devices", DEVICE, "kernel", "config.*")).sort.first

ONLY_SAVE = !!params.delete("--only-save")

unless params.empty?
  $stderr.puts "Unknown parameters #{params.join(", ")}."
  usage
  exit 1
end
unless other_args.empty?
  $stderr.puts "Unexpected arguments #{other_args.join(", ")}."
  usage
  exit 1
end
unless File.exists?(FILE)
  $stderr.puts "Could not find kernel configuration file for #{DEVICE}."
  usage
  exit 1
end

Dir.chdir(ROOT) do
  tool = File.join(`#{[
    "nix-build",
    "--no-out-link",
    "--argstr", "device", DEVICE,
    "-A", "config.mobile.boot.stage-1.kernel.package.menuconfig"
  ].shelljoin}`.strip, "bin/nconf")

  if ONLY_SAVE
    # Equivalent to F9,Enter
    `echo -e "[20~\n" | #{[tool, FILE].shelljoin}`
  else
    system(tool, FILE)
  end
end

# vim: ft=ruby