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Merge pull request #60 from jcomellas/jc-getopt-0.7.0

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Add latest version getopt that automatically wraps usage output lines
This commit is contained in:
Dave Smith 2013-06-16 06:24:37 -07:00
commit 16eed82ae4
1 changed files with 379 additions and 158 deletions
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src/getopt.erl
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@ -11,19 +11,11 @@
-module(getopt).
-author('juanjo@comellas.org').
-export([parse/2, usage/2, usage/3, usage/4]).
-export([parse/2, usage/2, usage/3, usage/4, tokenize/1]).
-export([usage_cmd_line/2]).
-export_type([arg_type/0,
arg_value/0,
arg_spec/0,
simple_option/0,
compound_option/0,
option/0,
option_spec/0]).
-define(TAB_LENGTH, 8).
%% Indentation of the help messages in number of tabs.
-define(INDENTATION, 3).
-define(LINE_LENGTH, 75).
-define(MIN_USAGE_COMMAND_LINE_OPTION_LENGTH, 25).
%% Position of each field in the option specification tuple.
-define(OPT_NAME, 1).
@ -33,42 +25,48 @@
-define(OPT_HELP, 5).
-define(IS_OPT_SPEC(Opt), (tuple_size(Opt) =:= ?OPT_HELP)).
-define(IS_WHITESPACE(Char), ((Char) =:= $\s orelse (Char) =:= $\t orelse
(Char) =:= $\n orelse (Char) =:= $\r)).
%% Atom indicating the data type that an argument can be converted to.
-type arg_type() :: 'atom' | 'binary' | 'boolean' | 'float' | 'integer' | 'string'.
-type arg_type() :: 'atom' | 'binary' | 'boolean' | 'float' | 'integer' | 'string'.
%% Data type that an argument can be converted to.
-type arg_value() :: atom() | binary() | boolean() | float() | integer() | string().
-type arg_value() :: atom() | binary() | boolean() | float() | integer() | string().
%% Argument specification.
-type arg_spec() :: arg_type() | {arg_type(), arg_value()} | undefined.
-type arg_spec() :: arg_type() | {arg_type(), arg_value()} | undefined.
%% Option type and optional default argument.
-type simple_option() :: atom().
-type compound_option() :: {atom(), arg_value()}.
-type option() :: simple_option() | compound_option().
-type simple_option() :: atom().
-type compound_option() :: {atom(), arg_value()}.
-type option() :: simple_option() | compound_option().
%% Command line option specification.
-type option_spec() :: {
Name :: atom(),
Short :: char() | undefined,
Long :: string() | undefined,
ArgSpec :: arg_spec(),
Help :: string() | undefined
Name :: atom(),
Short :: char() | undefined,
Long :: string() | undefined,
ArgSpec :: arg_spec(),
Help :: string() | undefined
}.
%% Output streams
-type output_stream() :: 'standard_io' | 'standard_error'.
-type output_stream() :: 'standard_io' | 'standard_error'.
%% For internal use
-type usage_line() :: {OptionText :: string(), HelpText :: string()}.
-type usage_line_with_length() :: {OptionLength :: non_neg_integer(), OptionText :: string(), HelpText :: string()}.
-export_type([arg_type/0, arg_value/0, arg_spec/0, simple_option/0, compound_option/0, option/0, option_spec/0]).
%% @doc Parse the command line options and arguments returning a list of tuples
%% and/or atoms using the Erlang convention for sending options to a
%% function.
-spec parse([option_spec()], string() | [string()]) ->
{ok, {[option()], [string()]}} | {error, {Reason :: atom(), Data :: any()}}.
parse(OptSpecList, CmdLine) ->
{ok, {[option()], [string()]}} | {error, {Reason :: atom(), Data :: any()}}.
parse(OptSpecList, CmdLine) when is_list(CmdLine) ->
try
Args = if
is_integer(hd(CmdLine)) ->
string:tokens(CmdLine, " \t\n");
true ->
CmdLine
is_integer(hd(CmdLine)) -> tokenize(CmdLine);
true -> CmdLine
end,
parse(OptSpecList, [], [], 0, Args)
catch
@ -78,7 +76,7 @@ parse(OptSpecList, CmdLine) ->
-spec parse([option_spec()], [option()], [string()], integer(), [string()]) ->
{ok, {[option()], [string()]}}.
{ok, {[option()], [string()]}}.
%% Process the option terminator.
parse(OptSpecList, OptAcc, ArgAcc, _ArgPos, ["--" | Tail]) ->
%% Any argument present after the terminator is not considered an option.
@ -110,7 +108,7 @@ parse(OptSpecList, OptAcc, ArgAcc, _ArgPos, []) ->
%% --foo=bar Single option 'foo', argument "bar"
%% --foo bar Single option 'foo', argument "bar"
-spec parse_long_option([option_spec()], [option()], [string()], integer(), [string()], string(), string()) ->
{ok, {[option()], [string()]}}.
{ok, {[option()], [string()]}}.
parse_long_option(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, OptArg) ->
case split_assigned_arg(OptArg) of
{Long, Arg} ->
@ -197,7 +195,7 @@ parse_long_option_next_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, {Name, _Sh
%% -bcafoo Multiple options: 'b'; 'c'; 'a' with argument "foo"
%% -aaa Multiple repetitions of option 'a' (only valid for options with integer arguments)
-spec parse_short_option([option_spec()], [option()], [string()], integer(), [string()], string(), string()) ->
{ok, {[option()], [string()]}}.
{ok, {[option()], [string()]}}.
parse_short_option(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, OptArg) ->
parse_short_option(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, first, OptArg).
@ -258,7 +256,7 @@ parse_short_option_next_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, {Name, _S
%% Pos argument.
-spec find_non_option_arg([option_spec()], integer()) -> {value, option_spec()} | false.
find_non_option_arg([{_Name, undefined, undefined, _ArgSpec, _Help} = OptSpec | _Tail], 0) ->
{value, OptSpec};
{value, OptSpec};
find_non_option_arg([{_Name, undefined, undefined, _ArgSpec, _Help} | Tail], Pos) ->
find_non_option_arg(Tail, Pos - 1);
find_non_option_arg([_Head | Tail], Pos) ->
@ -272,12 +270,12 @@ find_non_option_arg([], _Pos) ->
-spec append_default_options([option_spec()], [option()]) -> [option()].
append_default_options([{Name, _Short, _Long, {_Type, DefaultArg}, _Help} | Tail], OptAcc) ->
append_default_options(Tail,
case lists:keymember(Name, 1, OptAcc) of
false ->
[{Name, DefaultArg} | OptAcc];
_ ->
OptAcc
end);
case lists:keymember(Name, 1, OptAcc) of
false ->
[{Name, DefaultArg} | OptAcc];
_ ->
OptAcc
end);
%% For options with no default argument.
append_default_options([_Head | Tail], OptAcc) ->
append_default_options(Tail, OptAcc);
@ -470,152 +468,375 @@ is_non_neg_float_arg([]) ->
%% arguments that are supported by the program.
-spec usage([option_spec()], string()) -> ok.
usage(OptSpecList, ProgramName) ->
usage(OptSpecList, ProgramName, standard_error).
usage(OptSpecList, ProgramName, standard_error).
%% @doc Show a message on standard_error or standard_io indicating the command line options and
%% arguments that are supported by the program.
-spec usage([option_spec()], string(), output_stream() | string()) -> 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)]);
io:format(OutputStream, "~s~n~n~s~n",
[usage_cmd_line(ProgramName, OptSpecList), usage_options(OptSpecList)]);
%% @doc Show a message on standard_error 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) ->
usage(OptSpecList, ProgramName, CmdLineTail, standard_error).
usage(OptSpecList, ProgramName, CmdLineTail, standard_error).
%% @doc Show a message on standard_error or standard_io 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() | [{string(), string()}]) -> ok.
-spec usage([option_spec()], ProgramName :: string(), CmdLineTail :: string(), output_stream() | [{string(), string()}]) -> ok.
usage(OptSpecList, ProgramName, CmdLineTail, OutputStream) when is_atom(OutputStream) ->
io:format(OutputStream, "Usage: ~s~s ~s~n~n~s~n",
[ProgramName, usage_cmd_line(OptSpecList), CmdLineTail, usage_options(OptSpecList)]);
io:format(OutputStream, "~s~n~n~s~n",
[usage_cmd_line(ProgramName, OptSpecList, CmdLineTail), usage_options(OptSpecList)]);
%% @doc Show a message on standard_error 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) ->
usage(OptSpecList, ProgramName, CmdLineTail, OptionsTail, standard_error).
usage(OptSpecList, ProgramName, CmdLineTail, OptionsTail, standard_error).
%% @doc Show a message on standard_error or standard_io 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.
-spec usage([option_spec()], ProgramName :: string(), CmdLineTail :: string(),
[{OptionName :: string(), Help :: 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(OutputStream, "Usage: ~s~s ~s~n~n~s~n",
[ProgramName, usage_cmd_line(OptSpecList), CmdLineTail,
lists:flatten(lists:reverse(UsageOptions))]).
io:format(OutputStream, "~s~n~n~s~n",
[usage_cmd_line(ProgramName, OptSpecList, CmdLineTail), usage_options(OptSpecList, OptionsTail)]).
%% @doc Return a string with the syntax for the command line options and
%% arguments.
-spec usage_cmd_line([option_spec()]) -> string().
usage_cmd_line(OptSpecList) ->
usage_cmd_line(OptSpecList, []).
-spec usage_cmd_line(ProgramName :: string(), [option_spec()]) -> iolist().
usage_cmd_line(ProgramName, OptSpecList) ->
usage_cmd_line(ProgramName, OptSpecList, "").
usage_cmd_line([{Name, Short, Long, ArgSpec, _Help} | Tail], Acc) ->
CmdLine =
case ArgSpec of
undefined ->
if
%% For options with short form and no argument.
Short =/= undefined ->
[$\s, $[, $-, Short, $]];
%% For options with only long form and no argument.
Long =/= undefined ->
[$\s, $[, $-, $-, Long, $]];
true ->
[]
end;
_ ->
if
%% For options with short form and argument.
Short =/= undefined ->
[$\s, $[, $-, Short, $\s, $<, atom_to_list(Name), $>, $]];
%% For options with only long form and argument.
Long =/= undefined ->
[$\s, $[, $-, $-, Long, $\s, $<, atom_to_list(Name), $>, $]];
%% For options with neither short nor long form and argument.
true ->
[$\s, $<, atom_to_list(Name), $>]
end
end,
usage_cmd_line(Tail, [CmdLine | Acc]);
usage_cmd_line([], Acc) ->
lists:flatten(lists:reverse(Acc)).
%% @doc Return a string with the help message for each of the options and
%% arguments.
-spec usage_options([option_spec()]) -> string().
usage_options(OptSpecList) ->
lists:flatten(lists:reverse(usage_options_reverse(OptSpecList, []))).
usage_options_reverse([{Name, Short, Long, _ArgSpec, Help} | Tail], Acc) ->
Prefix =
case Long of
undefined ->
case Short of
%% Neither short nor long form (non-option argument).
undefined ->
[$<, atom_to_list(Name), $>];
%% Only short form.
_ ->
[$-, Short]
end;
_ ->
case Short of
%% Only long form.
undefined ->
[$-, $- | Long];
%% Both short and long form.
_ ->
[$-, Short, $,, $\s, $-, $- | Long]
end
end,
usage_options_reverse(Tail, add_option_help(Prefix, Help, Acc));
usage_options_reverse([], Acc) ->
Acc.
%% @doc Add the help message corresponding to an option specification to a list
%% with the correct indentation.
-spec add_option_help(Prefix :: string(), Help :: string(), Acc :: string()) -> string().
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 ->
Tab = lists:duplicate(ceiling(TabSize / ?TAB_LENGTH), $\t),
[[$\s, $\s, FlatPrefix, Tab, Help, $\n] | Acc];
_ ->
% The indentation for the option description is 3 tabs (i.e. 24 characters)
% IMPORTANT: Change the number of tabs below if you change the
% value of the INDENTATION macro.
[[$\t, $\t, $\t, Help, $\n], [$\s, $\s, FlatPrefix, $\n] | Acc]
end;
add_option_help(_Opt, _Prefix, Acc) ->
Acc.
%% @doc Return the smallest integral value not less than the argument.
-spec ceiling(float()) -> integer().
ceiling(X) ->
T = erlang:trunc(X),
case (X - T) of
% Neg when Neg < 0 ->
% T;
Pos when Pos > 0 ->
T + 1;
_ ->
T
-spec usage_cmd_line(ProgramName :: string(), [option_spec()], CmdLineTail :: string()) -> iolist().
usage_cmd_line(ProgramName, OptSpecList, CmdLineTail) ->
Prefix = "Usage: " ++ ProgramName,
PrefixLength = length(Prefix),
LineLength = line_length(),
%% Only align the command line options after the program name when there is
%% enough room to do so (i.e. at least 25 characters). If not, show the
%% command line options below the program name with a 2-character indentation.
if
(LineLength - PrefixLength) > ?MIN_USAGE_COMMAND_LINE_OPTION_LENGTH ->
Indentation = lists:duplicate(PrefixLength, $\s),
[FirstOptLine | OptLines] = usage_cmd_line_options(LineLength - PrefixLength, OptSpecList, CmdLineTail),
IndentedOptLines = [[Indentation | OptLine] || OptLine <- OptLines],
[Prefix, FirstOptLine | IndentedOptLines];
true ->
IndentedOptLines = [[" " | OptLine] || OptLine <- usage_cmd_line_options(LineLength, OptSpecList, CmdLineTail)],
[Prefix, $\n, IndentedOptLines]
end.
%% @doc Return a list of the lines corresponding to the usage command line
%% already wrapped according to the maximum MaxLineLength.
-spec usage_cmd_line_options(MaxLineLength :: non_neg_integer(), [option_spec()], CmdLineTail :: string()) -> iolist().
usage_cmd_line_options(MaxLineLength, OptSpecList, CmdLineTail) ->
usage_cmd_line_options(MaxLineLength, OptSpecList ++ string:tokens(CmdLineTail, " "), [], 0, []).
usage_cmd_line_options(MaxLineLength, [OptSpec | Tail], LineAcc, LineAccLength, Acc) ->
Option = [$\s | lists:flatten(usage_cmd_line_option(OptSpec))],
OptionLength = length(Option),
%% We accumulate the options in LineAcc until its length is over the
%% maximum allowed line length. When that happens, we append the line in
%% LineAcc to the list with all the lines in the command line (Acc).
NewLineAccLength = LineAccLength + OptionLength,
if
NewLineAccLength < MaxLineLength ->
usage_cmd_line_options(MaxLineLength, Tail, [Option | LineAcc], NewLineAccLength, Acc);
true ->
usage_cmd_line_options(MaxLineLength, Tail, [Option], OptionLength + 1,
[lists:reverse([$\n | LineAcc]) | Acc])
end;
usage_cmd_line_options(MaxLineLength, [], [_ | _] = LineAcc, _LineAccLength, Acc) ->
%% If there was a non-empty line in LineAcc when there are no more options
%% to process, we add it to the list of lines to return.
usage_cmd_line_options(MaxLineLength, [], [], 0, [lists:reverse(LineAcc) | Acc]);
usage_cmd_line_options(_MaxLineLength, [], [], _LineAccLength, Acc) ->
lists:reverse(Acc).
-spec usage_cmd_line_option(option_spec()) -> string().
usage_cmd_line_option({_Name, Short, _Long, undefined, _Help}) when Short =/= undefined ->
%% For options with short form and no argument.
[$[, $-, Short, $]];
usage_cmd_line_option({_Name, _Short, Long, undefined, _Help}) when Long =/= undefined ->
%% For options with only long form and no argument.
[$[, $-, $-, Long, $]];
usage_cmd_line_option({_Name, _Short, _Long, undefined, _Help}) ->
[];
usage_cmd_line_option({Name, Short, Long, ArgSpec, _Help}) when is_atom(ArgSpec) ->
%% For options with no default argument.
if
%% For options with short form and argument.
Short =/= undefined -> [$[, $-, Short, $\s, $<, atom_to_list(Name), $>, $]];
%% For options with only long form and argument.
Long =/= undefined -> [$[, $-, $-, Long, $\s, $<, atom_to_list(Name), $>, $]];
%% For options with neither short nor long form and argument.
true -> [$[, $<, atom_to_list(Name), $>, $]]
end;
usage_cmd_line_option({Name, Short, Long, ArgSpec, _Help}) when is_tuple(ArgSpec) ->
%% For options with default argument.
if
%% For options with short form and default argument.
Short =/= undefined -> [$[, $-, Short, $\s, $[, $<, atom_to_list(Name), $>, $], $]];
%% For options with only long form and default argument.
Long =/= undefined -> [$[, $-, $-, Long, $\s, $[, $<, atom_to_list(Name), $>, $], $]];
%% For options with neither short nor long form and default argument.
true -> [$[, $<, atom_to_list(Name), $>, $]]
end;
usage_cmd_line_option(Option) when is_list(Option) ->
%% For custom options that are added to the command line.
Option.
%% @doc Return a list of help messages to print for each of the options and arguments.
-spec usage_options([option_spec()]) -> [string()].
usage_options(OptSpecList) ->
usage_options(OptSpecList, []).
%% @doc Return a list of usage lines to print for each of the options and arguments.
-spec usage_options([option_spec()], [{OptionName :: string(), Help :: string()}]) -> [string()].
usage_options(OptSpecList, CustomHelp) ->
%% Add the usage lines corresponding to the option specifications.
{MaxOptionLength0, UsageLines0} = add_option_spec_help_lines(OptSpecList, 0, []),
%% Add the custom usage lines.
{MaxOptionLength, UsageLines} = add_custom_help_lines(CustomHelp, MaxOptionLength0, UsageLines0),
MaxLineLength = line_length(),
lists:reverse([format_usage_line(MaxOptionLength + 1, MaxLineLength, UsageLine) || UsageLine <- UsageLines]).
-spec add_option_spec_help_lines([option_spec()], PrevMaxOptionLength :: non_neg_integer(), [usage_line_with_length()]) ->
{MaxOptionLength :: non_neg_integer(), [usage_line_with_length()]}.
add_option_spec_help_lines([OptSpec | Tail], PrevMaxOptionLength, Acc) ->
OptionText = usage_option_text(OptSpec),
HelpText = usage_help_text(OptSpec),
{MaxOptionLength, ColsWithLength} = get_max_option_length({OptionText, HelpText}, PrevMaxOptionLength),
add_option_spec_help_lines(Tail, MaxOptionLength, [ColsWithLength | Acc]);
add_option_spec_help_lines([], MaxOptionLength, Acc) ->
{MaxOptionLength, Acc}.
-spec add_custom_help_lines([usage_line()], PrevMaxOptionLength :: non_neg_integer(), [usage_line_with_length()]) ->
{MaxOptionLength :: non_neg_integer(), [usage_line_with_length()]}.
add_custom_help_lines([CustomCols | Tail], PrevMaxOptionLength, Acc) ->
{MaxOptionLength, ColsWithLength} = get_max_option_length(CustomCols, PrevMaxOptionLength),
add_custom_help_lines(Tail, MaxOptionLength, [ColsWithLength | Acc]);
add_custom_help_lines([], MaxOptionLength, Acc) ->
{MaxOptionLength, Acc}.
-spec usage_option_text(option_spec()) -> string().
usage_option_text({Name, undefined, undefined, _ArgSpec, _Help}) ->
%% Neither short nor long form (non-option argument).
"<" ++ atom_to_list(Name) ++ ">";
usage_option_text({_Name, Short, undefined, _ArgSpec, _Help}) ->
%% Only short form.
[$-, Short];
usage_option_text({_Name, undefined, Long, _ArgSpec, _Help}) ->
%% Only long form.
[$-, $- | Long];
usage_option_text({_Name, Short, Long, _ArgSpec, _Help}) ->
%% Both short and long form.
[$-, Short, $,, $\s, $-, $- | Long].
-spec usage_help_text(option_spec()) -> string().
usage_help_text({_Name, _Short, _Long, {_ArgType, ArgValue}, [_ | _] = Help}) ->
Help ++ " [default: " ++ default_arg_value_to_string(ArgValue) ++ "]";
usage_help_text({_Name, _Short, _Long, _ArgSpec, Help}) ->
Help.
%% @doc Calculate the maximum width of the column that shows the option's short
%% and long form.
-spec get_max_option_length(usage_line(), PrevMaxOptionLength :: non_neg_integer()) ->
{MaxOptionLength :: non_neg_integer(), usage_line_with_length()}.
get_max_option_length({OptionText, HelpText}, PrevMaxOptionLength) ->
OptionLength = length(OptionText),
{erlang:max(OptionLength, PrevMaxOptionLength), {OptionLength, OptionText, HelpText}}.
%% @doc Format the usage line that is shown for the options' usage. Each usage
%% line has 2 columns. The first column shows the options in their short
%% and long form. The second column shows the wrapped (if necessary) help
%% text lines associated with each option. e.g.:
%%
%% -h, --host Database server host name or IP address; this is the
%% hostname of the server where the database is running
%% [default: localhost]
%% -p, --port Database server port [default: 1000]
%%
-spec format_usage_line(MaxOptionLength :: non_neg_integer(), MaxLineLength :: non_neg_integer(),
usage_line_with_length()) -> iolist().
format_usage_line(MaxOptionLength, MaxLineLength, {OptionLength, OptionText, [_ | _] = HelpText})
when MaxOptionLength < (MaxLineLength div 2) ->
%% If the width of the column where the options are shown is smaller than
%% half the width of a console line then we show the help text line aligned
%% next to its corresponding option, with a separation of at least 2
%% characters.
[Head | Tail] = wrap_text_line(MaxLineLength - MaxOptionLength - 3, HelpText),
FirstLineIndentation = lists:duplicate(MaxOptionLength - OptionLength + 1, $\s),
Indentation = [$\n | lists:duplicate(MaxOptionLength + 3, $\s)],
[" ", OptionText, FirstLineIndentation, Head,
[[Indentation, Line] || Line <- Tail], $\n];
format_usage_line(_MaxOptionLength, MaxLineLength, {_OptionLength, OptionText, [_ | _] = HelpText}) ->
%% If the width of the first column is bigger than the width of a console
%% line, we show the help text on the next line with an indentation of 6
%% characters.
HelpLines = wrap_text_line(MaxLineLength - 6, HelpText),
[" ", OptionText, [["\n ", Line] || Line <- HelpLines], $\n];
format_usage_line(_MaxOptionLength, _MaxLineLength, {_OptionLength, OptionText, _HelpText}) ->
[" ", OptionText, $\n].
%% @doc Wrap a text line converting it into several text lines so that the
%% length of each one of them is never over HelpLength characters.
-spec wrap_text_line(Length :: non_neg_integer(), Text :: string()) -> [string()].
wrap_text_line(Length, Text) ->
wrap_text_line(Length, Text, [], 0, []).
wrap_text_line(Length, [Char | Tail], Acc, Count, CurrentLineAcc) when Count < Length ->
wrap_text_line(Length, Tail, Acc, Count + 1, [Char | CurrentLineAcc]);
wrap_text_line(Length, [_ | _] = Help, Acc, Count, CurrentLineAcc) ->
%% Look for the first whitespace character in the current (reversed) line
%% buffer to get a wrapped line. If there is no whitespace just cut the
%% line at the position corresponding to the maximum length.
{NextLineAcc, WrappedLine} = case string:cspan(CurrentLineAcc, " \t") of
WhitespacePos when WhitespacePos < Count ->
lists:split(WhitespacePos, CurrentLineAcc);
_ ->
{[], CurrentLineAcc}
end,
wrap_text_line(Length, Help, [lists:reverse(WrappedLine) | Acc], length(NextLineAcc), NextLineAcc);
wrap_text_line(_Length, [], Acc, _Count, [_ | _] = CurrentLineAcc) ->
%% If there was a non-empty line when we reached the buffer, add it to the accumulator
lists:reverse([lists:reverse(CurrentLineAcc) | Acc]);
wrap_text_line(_Length, [], Acc, _Count, _CurrentLineAcc) ->
lists:reverse(Acc).
default_arg_value_to_string(Value) when is_atom(Value) ->
atom_to_list(Value);
default_arg_value_to_string(Value) when is_binary(Value) ->
binary_to_list(Value);
default_arg_value_to_string(Value) when is_integer(Value) ->
integer_to_list(Value);
default_arg_value_to_string(Value) when is_float(Value) ->
float_to_list(Value);
default_arg_value_to_string(Value) ->
Value.
%% @doc Tokenize a command line string with support for single and double
%% quoted arguments (needed for arguments that have embedded whitespace).
%% The function also supports the expansion of environment variables in
%% both the Unix (${VAR}; $VAR) and Windows (%VAR%) formats. It does NOT
%% support wildcard expansion of paths.
-spec tokenize(CmdLine :: string()) -> [nonempty_string()].
tokenize(CmdLine) ->
tokenize(CmdLine, [], []).
-spec tokenize(CmdLine :: string(), Acc :: [string()], ArgAcc :: string()) -> [string()].
tokenize([Sep | Tail], Acc, ArgAcc) when ?IS_WHITESPACE(Sep) ->
NewAcc = case ArgAcc of
[_ | _] ->
%% Found separator: add to the list of arguments.
[lists:reverse(ArgAcc) | Acc];
[] ->
%% Found separator with no accumulated argument; discard it.
Acc
end,
tokenize(Tail, NewAcc, []);
tokenize([QuotationMark | Tail], Acc, ArgAcc) when QuotationMark =:= $"; QuotationMark =:= $' ->
%% Quoted argument (might contain spaces, tabs, etc.)
tokenize_quoted_arg(QuotationMark, Tail, Acc, ArgAcc);
tokenize([Char | _Tail] = CmdLine, Acc, ArgAcc) when Char =:= $$; Char =:= $% ->
%% Unix and Windows environment variable expansion: ${VAR}; $VAR; %VAR%
{NewCmdLine, Var} = expand_env_var(CmdLine),
tokenize(NewCmdLine, Acc, lists:reverse(Var, ArgAcc));
tokenize([$\\, Char | Tail], Acc, ArgAcc) ->
%% Escaped char.
tokenize(Tail, Acc, [Char | ArgAcc]);
tokenize([Char | Tail], Acc, ArgAcc) ->
tokenize(Tail, Acc, [Char | ArgAcc]);
tokenize([], Acc, []) ->
lists:reverse(Acc);
tokenize([], Acc, ArgAcc) ->
lists:reverse([lists:reverse(ArgAcc) | Acc]).
-spec tokenize_quoted_arg(QuotationMark :: char(), CmdLine :: string(), Acc :: [string()], ArgAcc :: string()) -> [string()].
tokenize_quoted_arg(QuotationMark, [QuotationMark | Tail], Acc, ArgAcc) ->
%% End of quoted argument
tokenize(Tail, Acc, ArgAcc);
tokenize_quoted_arg(QuotationMark, [$\\, Char | Tail], Acc, ArgAcc) ->
%% Escaped char.
tokenize_quoted_arg(QuotationMark, Tail, Acc, [Char | ArgAcc]);
tokenize_quoted_arg($" = QuotationMark, [Char | _Tail] = CmdLine, Acc, ArgAcc) when Char =:= $$; Char =:= $% ->
%% Unix and Windows environment variable expansion (only for double-quoted arguments): ${VAR}; $VAR; %VAR%
{NewCmdLine, Var} = expand_env_var(CmdLine),
tokenize_quoted_arg(QuotationMark, NewCmdLine, Acc, lists:reverse(Var, ArgAcc));
tokenize_quoted_arg(QuotationMark, [Char | Tail], Acc, ArgAcc) ->
tokenize_quoted_arg(QuotationMark, Tail, Acc, [Char | ArgAcc]);
tokenize_quoted_arg(_QuotationMark, CmdLine, Acc, ArgAcc) ->
tokenize(CmdLine, Acc, ArgAcc).
-spec expand_env_var(CmdLine :: nonempty_string()) -> {string(), string()}.
expand_env_var(CmdLine) ->
case CmdLine of
"${" ++ Tail ->
expand_env_var("${", $}, Tail, []);
"$" ++ Tail ->
expand_env_var("$", Tail, []);
"%" ++ Tail ->
expand_env_var("%", $%, Tail, [])
end.
-spec expand_env_var(Prefix :: string(), EndMark :: char(), CmdLine :: string(), Acc :: string()) -> {string(), string()}.
expand_env_var(Prefix, EndMark, [Char | Tail], Acc)
when (Char >= $A andalso Char =< $Z) orelse (Char >= $a andalso Char =< $z) orelse
(Char >= $0 andalso Char =< $9) orelse (Char =:= $_) ->
expand_env_var(Prefix, EndMark, Tail, [Char | Acc]);
expand_env_var(Prefix, EndMark, [EndMark | Tail], Acc) ->
{Tail, get_env_var(Prefix, [EndMark], Acc)};
expand_env_var(Prefix, _EndMark, CmdLine, Acc) ->
{CmdLine, Prefix ++ lists:reverse(Acc)}.
-spec expand_env_var(Prefix :: string(), CmdLine :: string(), Acc :: string()) -> {string(), string()}.
expand_env_var(Prefix, [Char | Tail], Acc)
when (Char >= $A andalso Char =< $Z) orelse (Char >= $a andalso Char =< $z) orelse
(Char >= $0 andalso Char =< $9) orelse (Char =:= $_) ->
expand_env_var(Prefix, Tail, [Char | Acc]);
expand_env_var(Prefix, CmdLine, Acc) ->
{CmdLine, get_env_var(Prefix, "", Acc)}.
-spec get_env_var(Prefix :: string(), Suffix :: string(), Acc :: string()) -> string().
get_env_var(Prefix, Suffix, [_ | _] = Acc) ->
Name = lists:reverse(Acc),
%% Only expand valid/existing variables.
case os:getenv(Name) of
false -> Prefix ++ Name ++ Suffix;
Value -> Value
end;
get_env_var(Prefix, Suffix, []) ->
Prefix ++ Suffix.
-spec line_length() -> non_neg_integer().
line_length() ->
case io:columns() of
{ok, Columns} when Columns < ?LINE_LENGTH ->
Columns - 1;
_ ->
?LINE_LENGTH
end.