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Simplified usage info printing with getopt v0.2

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This commit is contained in:
Tuncer Ayaz 2010-01-09 00:36:29 +01:00
parent 81fd519100
commit e9ddd08e2a
2 changed files with 108 additions and 54 deletions
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128
src/getopt.erl
View file

@ -11,13 +11,14 @@
-module(getopt).
-author('juanjo@comellas.org').
-export([parse/2, usage/2]).
-export([parse/2, usage/2, usage/3, usage/4]).
-define(TAB_LENGTH, 8).
%% Indentation of the help messages in number of tabs.
-define(INDENTATION, 3).
%% Position of each field in the option specification tuple.
-define(OPT_NAME, 1).
-define(OPT_SHORT, 2).
-define(OPT_LONG, 3).
@ -80,7 +81,7 @@ parse(OptSpecList, OptAcc, ArgAcc, _ArgPos, ["--" | Tail]) ->
parse(OptSpecList, OptAcc, ArgAcc, ArgPos, [[$-, $- | OptArg] = OptStr | Tail]) ->
parse_option_long(OptSpecList, OptAcc, ArgAcc, ArgPos, Tail, OptStr, OptArg);
%% Process short options.
parse(OptSpecList, OptAcc, ArgAcc, ArgPos, [[$- | OptArg] = OptStr | Tail]) ->
parse(OptSpecList, OptAcc, ArgAcc, ArgPos, [[$- | [_Char | _] = OptArg] = OptStr | Tail]) ->
parse_option_short(OptSpecList, OptAcc, ArgAcc, ArgPos, Tail, OptStr, OptArg);
%% Process non-option arguments.
parse(OptSpecList, OptAcc, ArgAcc, ArgPos, [Arg | Tail]) ->
@ -97,13 +98,14 @@ parse(OptSpecList, OptAcc, ArgAcc, _ArgPos, []) ->
{ok, {lists:reverse(append_default_options(OptSpecList, OptAcc)), lists:reverse(ArgAcc)}}.
%% A long option can have the following formats:
-spec parse_option_long([option_spec()], [option()], [string()], integer(), [string()], string(), string()) ->
{ok, {[option()], [string()]}} | {error, {Reason :: atom(), Data:: any()}}.
%% @doc Parse a long option, add it to the option accumulator and continue
%% parsing the rest of the arguments recursively.
%% A long option can have the following syntax:
%% --foo Single option 'foo', no argument
%% --foo=bar Single option 'foo', argument "bar"
%% --foo bar Single option 'foo', argument "bar"
-spec parse_option_long([option_spec()], [option()], [string()], integer(), [string()], string(), string()) ->
{ok, {[option()], [string()]}} | {error, {Reason :: atom(), Data:: any()}}.
parse_option_long(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, OptArg) ->
case split_assigned_arg(OptArg) of
{Long, Arg} ->
@ -126,6 +128,12 @@ parse_option_long(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, OptArg) ->
end.
-spec parse_option_assigned_arg([option_spec()], [option()], [string()], integer(),
[string()], string(), string(), string()) ->
{ok, {[option()], [string()]}} | {error, {Reason :: atom(), Data:: any()}}.
%% @doc Parse an option where the argument is 'assigned' in the same string using
%% the '=' character, add it to the option accumulator and continue parsing the
%% rest of the arguments recursively. This syntax is only valid for long options.
parse_option_assigned_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, Long, Arg) ->
case lists:keysearch(Long, ?OPT_LONG, OptSpecList) of
{value, {_Name, _Short, Long, ArgSpec, _Help} = OptSpec} ->
@ -141,7 +149,7 @@ parse_option_assigned_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, Lon
-spec split_assigned_arg(string()) -> {Name :: string(), Arg :: string()} | string().
%% @doc Split an option string that may contain and option with its argument
%% @doc Split an option string that may contain an option with its argument
%% separated by an equal ('=') character (e.g. "port=1000").
split_assigned_arg(OptStr) ->
split_assigned_arg(OptStr, OptStr, []).
@ -154,10 +162,10 @@ split_assigned_arg(OptStr, [], _Acc) ->
OptStr.
%% A short option can have the following formats:
%% -a Single option 'a', no argument
%% @doc Parse a short option, add it to the option accumulator and continue
%% parsing the rest of the arguments recursively.
%% A short option can have the following syntax:
%% -a Single option 'a', no argument or implicit boolean argument
%% -a foo Single option 'a', argument "foo"
%% -afoo Single option 'a', argument "foo"
%% -abc Multiple options: 'a'; 'b'; 'c'
@ -228,7 +236,8 @@ find_non_option_arg([], _Pos) ->
-spec append_default_options([option_spec()], [option()]) -> [option()].
%% @doc Appends the default values of the options that are not present.
%% @doc Append options that were not present in the command line arguments with
%% their default arguments.
append_default_options([{Name, _Short, _Long, {_Type, DefaultArg}, _Help} | Tail], OptAcc) ->
append_default_options(Tail,
case lists:keymember(Name, 1, OptAcc) of
@ -253,8 +262,6 @@ convert_option_no_arg({Name, _Short, _Long, ArgSpec, _Help}) ->
{Name, true};
boolean ->
{Name, true};
{_Type, DefaultValue} ->
{Name, DefaultValue};
_ ->
throw({error, {missing_option_arg, Name}})
end.
@ -273,6 +280,7 @@ convert_option_arg({Name, _Short, _Long, ArgSpec, _Help}, Arg) ->
-spec arg_spec_type(arg_spec()) -> arg_type() | undefined.
%% @doc Retrieve the data type form an argument specification.
arg_spec_type({Type, _DefaultArg}) ->
Type;
arg_spec_type(Type) when is_atom(Type) ->
@ -280,6 +288,7 @@ arg_spec_type(Type) when is_atom(Type) ->
-spec to_type(atom(), string()) -> arg_value().
%% @doc Convert an argument string to its corresponding data type.
to_type(binary, Arg) ->
list_to_binary(Arg);
to_type(atom, Arg) ->
@ -289,19 +298,36 @@ to_type(integer, Arg) ->
to_type(float, Arg) ->
list_to_float(Arg);
to_type(boolean, Arg) ->
is_boolean_arg(Arg);
LowerArg = string:to_lower(Arg),
case is_arg_true(LowerArg) of
true ->
true;
_ ->
case is_arg_false(LowerArg) of
true ->
false;
false ->
erlang:error(badarg)
end
end;
to_type(_Type, Arg) ->
Arg.
% -spec is_valid_option([option_spec()], Opt :: char() | string(), FieldPos :: integer()) -> boolean().
% is_valid_option(OptSpecList, Opt, FieldPos) ->
% case lists:keysearch(Opt, FieldPos, OptSpecList) of
% {value, {_Name, _Short, _Long, _ArgSpec, _Help}} ->
% true;
% _ ->
% false
% end.
-spec is_arg_true(string()) -> boolean().
is_arg_true(Arg) ->
(Arg =:= "true") orelse (Arg =:= "t") orelse
(Arg =:= "yes") orelse (Arg =:= "y") orelse
(Arg =:= "on") orelse (Arg =:= "enabled") orelse
(Arg =:= "1").
-spec is_arg_false(string()) -> boolean().
is_arg_false(Arg) ->
(Arg =:= "false") orelse (Arg =:= "f") orelse
(Arg =:= "no") orelse (Arg =:= "n") orelse
(Arg =:= "off") orelse (Arg =:= "disabled") orelse
(Arg =:= "0").
-spec is_valid_arg(arg_spec() | arg_type(), string()) -> boolean().
@ -320,10 +346,7 @@ is_valid_arg(_Type, _Arg) ->
-spec is_boolean_arg(string()) -> boolean().
is_boolean_arg(Arg) ->
LowerArg = string:to_lower(Arg),
(LowerArg =:= "true") orelse (LowerArg =:= "t") orelse
(LowerArg =:= "yes") orelse (LowerArg =:= "y") orelse
(LowerArg =:= "on") orelse (LowerArg =:= "enabled") orelse
(LowerArg =:= "1").
is_arg_true(LowerArg) orelse is_arg_false(LowerArg).
-spec is_integer_arg(string()) -> boolean().
@ -346,7 +369,7 @@ is_float_arg([]) ->
-spec usage([option_spec()], string()) -> ok.
%%--------------------------------------------------------------------
%% @spec usage(OptSpecList :: option_spec_list(), ProgramName :: string()) -> ok.
%% @spec usage(OptSpecList :: [option_spec()], ProgramName :: string()) -> ok.
%% @doc Show a message on stdout indicating the command line options and
%% arguments that are supported by the program.
%%--------------------------------------------------------------------
@ -355,6 +378,37 @@ usage(OptSpecList, ProgramName) ->
[ProgramName, usage_cmd_line(OptSpecList), usage_options(OptSpecList)]).
-spec usage([option_spec()], string(), string()) -> ok.
%%--------------------------------------------------------------------
%% @spec usage(OptSpecList :: [option_spec()], ProgramName :: string(), CmdLineTail :: string()) -> ok.
%% @doc Show a message on 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.
%%--------------------------------------------------------------------
usage(OptSpecList, ProgramName, CmdLineTail) ->
io:format("Usage: ~s~s ~s~n~n~s~n",
[ProgramName, usage_cmd_line(OptSpecList), CmdLineTail, usage_options(OptSpecList)]).
-spec usage([option_spec()], string(), string(), [{string(), string()}]) -> ok.
%%--------------------------------------------------------------------
%% @spec usage(OptSpecList :: [option_spec()], ProgramName :: string(),
%% CmdLineTail :: string(), OptionsTail :: [{string(), string()}]) -> ok.
%% @doc Show a message on 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.
%%--------------------------------------------------------------------
usage(OptSpecList, ProgramName, CmdLineTail, OptionsTail) ->
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",
[ProgramName, usage_cmd_line(OptSpecList), CmdLineTail,
lists:flatten(lists:reverse(UsageOptions))]).
-spec usage_cmd_line([option_spec()]) -> string().
%% @doc Return a string with the syntax for the command line options and
%% arguments.
@ -397,9 +451,9 @@ usage_cmd_line([], Acc) ->
%% @doc Return a string with the help message for each of the options and
%% arguments.
usage_options(OptSpecList) ->
usage_options(OptSpecList, []).
lists:flatten(lists:reverse(usage_options_reverse(OptSpecList, []))).
usage_options([{Name, Short, Long, _ArgSpec, _Help} = OptSpec | Tail], Acc) ->
usage_options_reverse([{Name, Short, Long, _ArgSpec, Help} | Tail], Acc) ->
Prefix =
case Long of
undefined ->
@ -421,14 +475,15 @@ usage_options([{Name, Short, Long, _ArgSpec, _Help} = OptSpec | Tail], Acc) ->
[$-, Short, $,, $\s, $-, $-, Long]
end
end,
usage_options(Tail, add_option_help(OptSpec, Prefix, Acc));
usage_options([], Acc) ->
lists:flatten(lists:reverse(Acc)).
usage_options_reverse(Tail, add_option_help(Prefix, Help, Acc));
usage_options_reverse([], Acc) ->
Acc.
-spec add_option_help(option_spec(), Prefix :: string(), Acc :: string()) -> string().
-spec add_option_help(Prefix :: string(), Help :: string(), Acc :: string()) -> string().
%% @doc Add the help message corresponding to an option specification to a list
%% with the correct indentation.
add_option_help({_Name, _Short, _Long, _ArgSpec, Help}, Prefix, Acc) when is_list(Help), Help =/= [] ->
add_option_help(Prefix, Help, Acc) when is_list(Help), Help =/= [] ->
FlatPrefix = lists:flatten(Prefix),
case ((?INDENTATION * ?TAB_LENGTH) - 2 - length(FlatPrefix)) of
TabSize when TabSize > 0 ->
@ -444,8 +499,9 @@ add_option_help(_Opt, _Prefix, Acc) ->
Acc.
-spec ceiling(float()) -> integer().
%% @doc Return the smallest integral valur not less than the argument.
%% @doc Return the smallest integral value not less than the argument.
ceiling(X) ->
T = erlang:trunc(X),
case (X - T) of

22
src/rebar_core.erl
View file

@ -128,28 +128,26 @@ set_global_flag(Options, Flag) ->
%% print help/usage string
%%
help() ->
Jobs = rebar_config:get_jobs(),
io:format(
"
Usage: rebar [-h] [-v] [-f] [-j <jobs>] [key=value,...] <command,...>
-h, --help Show the program options
-v, --verbose Be verbose about what gets done
-f, --force Force
-j, --jobs Number of concurrent workers a command may use. Default: ~B
", [Jobs]).
OptSpecList = option_spec_list(),
getopt:usage(OptSpecList, escript:script_name(),
"[var=value,...] <command,...>",
[{"var=value", "rebar global variables (e.g. force=1)"},
{"command", "Command to run (e.g. compile)"}]).
%%
%% options accepted via getopt
%%
option_spec_list() ->
Jobs = rebar_config:get_jobs(),
JobsHelp = io_lib:format(
"Number of concurrent workers a command may use. Default: ~B",
[Jobs]),
[
%% {Name, ShortOpt, LongOpt, ArgSpec, HelpMsg}
{help, $h, "help", undefined, "Show the program options"},
{verbose, $v, "verbose", undefined, "Be verbose about what gets done"},
{force, $f, "force", undefined, "Force"},
{jobs, $j, "jobs", integer,
"Number of concurrent workers a command may use."}
{jobs, $j, "jobs", integer, JobsHelp}
].
%%