68 lines
2.4 KiB
Elixir
68 lines
2.4 KiB
Elixir
## The contents of this file are subject to the Mozilla Public License
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## Version 1.1 (the "License"); you may not use this file except in
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## compliance with the License. You may obtain a copy of the License
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## at http://www.mozilla.org/MPL/
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##
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## Software distributed under the License is distributed on an "AS IS"
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## basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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## the License for the specific language governing rights and
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## limitations under the License.
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##
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## The Original Code is RabbitMQ.
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##
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## The Initial Developer of the Original Code is GoPivotal, Inc.
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## Copyright (c) 2007-2016 Pivotal Software, Inc. All rights reserved.
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defmodule Parser do
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# Input: A list of strings
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# Output: A 2-tuple of lists: one containing the command,
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# one containing flagged options.
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def parse(command) do
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{options, cmd, invalid} = OptionParser.parse(
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command,
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switches: build_switches([node: :atom,
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quiet: :boolean,
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timeout: :integer,
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vhost: :string,
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longnames: :boolean]),
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aliases: [p: :vhost, n: :node, q: :quiet, t: :timeout, l: :longnames]
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)
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{clear_on_empty_command(cmd), options_map(options), invalid}
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end
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defp build_switches(default) do
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Enum.reduce(Helpers.commands,
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default,
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fn({_, _}, {:error, _} = err) -> err;
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({_, command}, switches) ->
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command_switches = command.switches()
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case Enum.filter(command_switches,
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fn({key, val}) ->
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existing_val = switches[key]
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existing_val != nil and existing_val != val
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end) do
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[] -> switches ++ command_switches;
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_ -> exit({:command_invalid,
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{command, {:invalid_switches,
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command_switches}}})
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end
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end)
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end
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defp options_map(opts) do
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opts
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|> Map.new
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end
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# Discards entire command if first command term is empty.
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defp clear_on_empty_command(command_args) do
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case command_args do
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[] -> []
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[""|_] -> []
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[_head|_] -> command_args
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end
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end
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end
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