QPQ-AG/getopt
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Allow usage message to be printed to stderr (default) as well as stdout

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This commit is contained in:
Uwe Dauernheim 2012-01-06 00:19:16 +01:00
parent 2981dfe63e
commit ca5eb9ad09
1 changed files with 34 additions and 8 deletions
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42
src/getopt.erl
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@ -53,6 +53,8 @@
ArgSpec :: arg_spec(),
Help :: string() | undefined
}.
%% Output streams
-type output_stream() :: 'standard_io' | 'standard_error'.
%% @doc Parse the command line options and arguments returning a list of tuples
@ -371,34 +373,58 @@ is_float_arg([]) ->
true.
%% @doc Show a message on stdout indicating the command line options and
%% @doc Show a message on stderr indicating the command line options and
%% arguments that are supported by the program.
-spec usage([option_spec()], string()) -> ok.
usage(OptSpecList, ProgramName) ->
io:format("Usage: ~s~s~n~n~s~n",
[ProgramName, usage_cmd_line(OptSpecList), usage_options(OptSpecList)]).
usage(OptSpecList, ProgramName, standard_error).
%% @doc Show a message on stdout indicating the command line options and
%% @doc Show a message on stderr or stdout indicating the command line options and
%% arguments that are supported by the program.
-spec usage([option_spec()], string(), output_stream()) -> ok.
usage(OptSpecList, ProgramName, OutputStream) when is_atom(OutputStream) ->
io:format(OutputStream, "Usage: ~s~s~n~n~s~n",
[ProgramName, usage_cmd_line(OptSpecList), usage_options(OptSpecList)]);
%% @doc Show a message on stderr indicating the command line options and
%% arguments that are supported by the program. The CmdLineTail argument
%% is a string that is added to the end of the usage command line.
-spec usage([option_spec()], string(), string()) -> ok.
usage(OptSpecList, ProgramName, CmdLineTail) ->
io:format("Usage: ~s~s ~s~n~n~s~n",
[ProgramName, usage_cmd_line(OptSpecList), CmdLineTail, usage_options(OptSpecList)]).
usage(OptSpecList, ProgramName, CmdLineTail, standard_error).
%% @doc Show a message on stdout indicating the command line options and
%% @doc Show a message on stderr or stdout indicating the command line options and
%% arguments that are supported by the program. The CmdLineTail argument
%% is a string that is added to the end of the usage command line.
-spec usage([option_spec()], string(), string(), output_stream()) -> ok.
usage(OptSpecList, ProgramName, CmdLineTail) when is_atom(OutputStream) ->
io:format(OutputStream, "Usage: ~s~s ~s~n~n~s~n",
[ProgramName, usage_cmd_line(OptSpecList), CmdLineTail, usage_options(OptSpecList)]);
%% @doc Show a message on stderr indicating the command line options and
%% arguments that are supported by the program. The CmdLineTail and OptionsTail
%% arguments are a string that is added to the end of the usage command line
%% and a list of tuples that are added to the end of the options' help lines.
-spec usage([option_spec()], string(), string(), [{string(), string()}]) -> ok.
usage(OptSpecList, ProgramName, CmdLineTail, OptionsTail) ->
usage(OptSpecList, ProgramName, CmdLineTail, OptionsTail, standard_error).
%% @doc Show a message on stderr or stdout indicating the command line options and
%% arguments that are supported by the program. The CmdLineTail and OptionsTail
%% arguments are a string that is added to the end of the usage command line
%% and a list of tuples that are added to the end of the options' help lines.
-spec usage([option_spec()], string(), string(), [{string(), string()}], output_stream()) -> ok.
usage(OptSpecList, ProgramName, CmdLineTail, OptionsTail, OutputStream) ->
UsageOptions = lists:foldl(
fun ({Prefix, Help}, Acc) ->
add_option_help(Prefix, Help, Acc)
end, usage_options_reverse(OptSpecList, []), OptionsTail),
io:format("Usage: ~s~s ~s~n~n~s~n",
io:format(OutputStream, "Usage: ~s~s ~s~n~n~s~n",
[ProgramName, usage_cmd_line(OptSpecList), CmdLineTail,
lists:flatten(lists:reverse(UsageOptions))]).