class ChefCLI::Command::ShellInit

def check_license_acceptance
  # It gives a very weird error if users try to eval the shell-init command and it requests the
  # license from them. Instead, let users shell-init without accepting the license.
end

def completion_for(shell)
  return "" unless (completion_template_basename = completion_template_for(shell))
  completion_template_path = expand_completion_template_path(completion_template_basename)
  erb = ERB.new(File.read(completion_template_path), nil, "-")
  context_binding = shell_completion_template_context.get_binding
  erb.result(context_binding)
end

def completion_template_for(shell)
  case shell
  when "bash"
    "bash.sh.erb"
  when "fish"
    "chef.fish.erb"
  when "zsh"
    "zsh.zsh.erb"
  else
    # Pull requests accepted!
    nil
  end
end

def emit_shell_cmd(cmd)
  msg(cmd) unless cmd.empty?
end

def expand_completion_template_path(basename)
  File.join(File.expand_path("../completions", __dir__), basename)
end

def export(shell, var, val)
  case shell
  when "sh", "bash", "zsh"
    posix_shell_export(var, val)
  when "fish"
    fish_shell_export(var, val)
  when "powershell", "posh"
    powershell_export(var, val)
  end
end

def fish_shell_export(var, val)
  # Fish's syntax for setting PATH is special. Path elements are
  # divided by spaces (instead of colons). We also send STDERR to
  # /dev/null to avoid Fish's helpful warnings about nonexistent
  # PATH elements.
  if var == "PATH"
    emit_shell_cmd(%Q{set -gx #{var} "#{val.split(":").join('" "')}" 2>/dev/null;})
  else
    emit_shell_cmd(%Q{set -gx #{var} "#{val}";})
  end
end

def initialize
  super
  @shell_completion_template_context = nil
end

def omnibus_root
  config[:omnibus_dir] || super
end

def posix_shell_export(var, val)
  emit_shell_cmd(%Q{export #{var}="#{val}"})
end

def powershell_export(var, val)
  emit_shell_cmd(%Q{$env:#{var}="#{val}"})
end

def run(argv)
  # Currently we don't have any shell-specific features, so we ignore the
  # shell name. We'll need it if we add completion.
  remaining_args = parse_options(argv)
  shell_name = remaining_args.first
  if shell_name.nil?
    err("Please specify what shell you are using\n")
    err(opt_parser.to_s)
    return 1
  elsif !SUPPORTED_SHELLS.include?(shell_name)
    err("Shell `#{shell_name}' is not currently supported")
    err("Supported shells are: #{SUPPORTED_SHELLS.join(" ")}")
    return 1
  end
  env = omnibus_env.dup
  path = env.delete("PATH")
  export(shell_name, "PATH", path)
  env.each do |var_name, value|
    export(shell_name, var_name, value)
  end
  emit_shell_cmd(completion_for(shell_name))
  0
end

def shell_completion_template_context
  @shell_completion_template_context ||= ShellCompletionTemplateContext.new
end