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Diffstat (limited to 'contrib/lua-argparse/argparse.lua')
| -rw-r--r-- | contrib/lua-argparse/argparse.lua | 2100 |
1 files changed, 2100 insertions, 0 deletions
diff --git a/contrib/lua-argparse/argparse.lua b/contrib/lua-argparse/argparse.lua new file mode 100644 index 0000000..6b52962 --- /dev/null +++ b/contrib/lua-argparse/argparse.lua @@ -0,0 +1,2100 @@ +-- The MIT License (MIT) + +-- Copyright (c) 2013 - 2018 Peter Melnichenko +-- 2019 Paul Ouellette + +-- Permission is hereby granted, free of charge, to any person obtaining a copy of +-- this software and associated documentation files (the "Software"), to deal in +-- the Software without restriction, including without limitation the rights to +-- use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of +-- the Software, and to permit persons to whom the Software is furnished to do so, +-- subject to the following conditions: + +-- The above copyright notice and this permission notice shall be included in all +-- copies or substantial portions of the Software. + +-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS +-- FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR +-- COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER +-- IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN +-- CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + +local function deep_update(t1, t2) + for k, v in pairs(t2) do + if type(v) == "table" then + v = deep_update({}, v) + end + + t1[k] = v + end + + return t1 +end + +-- A property is a tuple {name, callback}. +-- properties.args is number of properties that can be set as arguments +-- when calling an object. +local function class(prototype, properties, parent) + -- Class is the metatable of its instances. + local cl = {} + cl.__index = cl + + if parent then + cl.__prototype = deep_update(deep_update({}, parent.__prototype), prototype) + else + cl.__prototype = prototype + end + + if properties then + local names = {} + + -- Create setter methods and fill set of property names. + for _, property in ipairs(properties) do + local name, callback = property[1], property[2] + + cl[name] = function(self, value) + if not callback(self, value) then + self["_" .. name] = value + end + + return self + end + + names[name] = true + end + + function cl.__call(self, ...) + -- When calling an object, if the first argument is a table, + -- interpret keys as property names, else delegate arguments + -- to corresponding setters in order. + if type((...)) == "table" then + for name, value in pairs((...)) do + if names[name] then + self[name](self, value) + end + end + else + local nargs = select("#", ...) + + for i, property in ipairs(properties) do + if i > nargs or i > properties.args then + break + end + + local arg = select(i, ...) + + if arg ~= nil then + self[property[1]](self, arg) + end + end + end + + return self + end + end + + -- If indexing class fails, fallback to its parent. + local class_metatable = {} + class_metatable.__index = parent + + function class_metatable.__call(self, ...) + -- Calling a class returns its instance. + -- Arguments are delegated to the instance. + local object = deep_update({}, self.__prototype) + setmetatable(object, self) + return object(...) + end + + return setmetatable(cl, class_metatable) +end + +local function typecheck(name, types, value) + for _, type_ in ipairs(types) do + if type(value) == type_ then + return true + end + end + + error(("bad property '%s' (%s expected, got %s)"):format(name, table.concat(types, " or "), type(value))) +end + +local function typechecked(name, ...) + local types = {...} + return {name, function(_, value) typecheck(name, types, value) end} +end + +local multiname = {"name", function(self, value) + typecheck("name", {"string"}, value) + + for alias in value:gmatch("%S+") do + self._name = self._name or alias + table.insert(self._aliases, alias) + table.insert(self._public_aliases, alias) + -- If alias contains '_', accept '-' also. + if alias:find("_", 1, true) then + table.insert(self._aliases, (alias:gsub("_", "-"))) + end + end + + -- Do not set _name as with other properties. + return true +end} + +local multiname_hidden = {"hidden_name", function(self, value) + typecheck("hidden_name", {"string"}, value) + + for alias in value:gmatch("%S+") do + table.insert(self._aliases, alias) + if alias:find("_", 1, true) then + table.insert(self._aliases, (alias:gsub("_", "-"))) + end + end + + return true +end} + +local function parse_boundaries(str) + if tonumber(str) then + return tonumber(str), tonumber(str) + end + + if str == "*" then + return 0, math.huge + end + + if str == "+" then + return 1, math.huge + end + + if str == "?" then + return 0, 1 + end + + if str:match "^%d+%-%d+$" then + local min, max = str:match "^(%d+)%-(%d+)$" + return tonumber(min), tonumber(max) + end + + if str:match "^%d+%+$" then + local min = str:match "^(%d+)%+$" + return tonumber(min), math.huge + end +end + +local function boundaries(name) + return {name, function(self, value) + typecheck(name, {"number", "string"}, value) + + local min, max = parse_boundaries(value) + + if not min then + error(("bad property '%s'"):format(name)) + end + + self["_min" .. name], self["_max" .. name] = min, max + end} +end + +local actions = {} + +local option_action = {"action", function(_, value) + typecheck("action", {"function", "string"}, value) + + if type(value) == "string" and not actions[value] then + error(("unknown action '%s'"):format(value)) + end +end} + +local option_init = {"init", function(self) + self._has_init = true +end} + +local option_default = {"default", function(self, value) + if type(value) ~= "string" then + self._init = value + self._has_init = true + return true + end +end} + +local add_help = {"add_help", function(self, value) + typecheck("add_help", {"boolean", "string", "table"}, value) + + if self._help_option_idx then + table.remove(self._options, self._help_option_idx) + self._help_option_idx = nil + end + + if value then + local help = self:flag() + :description "Show this help message and exit." + :action(function() + print(self:get_help()) + os.exit(0) + end) + + if value ~= true then + help = help(value) + end + + if not help._name then + help "-h" "--help" + end + + self._help_option_idx = #self._options + end +end} + +local Parser = class({ + _arguments = {}, + _options = {}, + _commands = {}, + _mutexes = {}, + _groups = {}, + _require_command = true, + _handle_options = true +}, { + args = 3, + typechecked("name", "string"), + typechecked("description", "string"), + typechecked("epilog", "string"), + typechecked("usage", "string"), + typechecked("help", "string"), + typechecked("require_command", "boolean"), + typechecked("handle_options", "boolean"), + typechecked("action", "function"), + typechecked("command_target", "string"), + typechecked("help_vertical_space", "number"), + typechecked("usage_margin", "number"), + typechecked("usage_max_width", "number"), + typechecked("help_usage_margin", "number"), + typechecked("help_description_margin", "number"), + typechecked("help_max_width", "number"), + add_help +}) + +local Command = class({ + _aliases = {}, + _public_aliases = {} +}, { + args = 3, + multiname, + typechecked("description", "string"), + typechecked("epilog", "string"), + multiname_hidden, + typechecked("summary", "string"), + typechecked("target", "string"), + typechecked("usage", "string"), + typechecked("help", "string"), + typechecked("require_command", "boolean"), + typechecked("handle_options", "boolean"), + typechecked("action", "function"), + typechecked("command_target", "string"), + typechecked("help_vertical_space", "number"), + typechecked("usage_margin", "number"), + typechecked("usage_max_width", "number"), + typechecked("help_usage_margin", "number"), + typechecked("help_description_margin", "number"), + typechecked("help_max_width", "number"), + typechecked("hidden", "boolean"), + add_help +}, Parser) + +local Argument = class({ + _minargs = 1, + _maxargs = 1, + _mincount = 1, + _maxcount = 1, + _defmode = "unused", + _show_default = true +}, { + args = 5, + typechecked("name", "string"), + typechecked("description", "string"), + option_default, + typechecked("convert", "function", "table"), + boundaries("args"), + typechecked("target", "string"), + typechecked("defmode", "string"), + typechecked("show_default", "boolean"), + typechecked("argname", "string", "table"), + typechecked("choices", "table"), + typechecked("hidden", "boolean"), + option_action, + option_init +}) + +local Option = class({ + _aliases = {}, + _public_aliases = {}, + _mincount = 0, + _overwrite = true +}, { + args = 6, + multiname, + typechecked("description", "string"), + option_default, + typechecked("convert", "function", "table"), + boundaries("args"), + boundaries("count"), + multiname_hidden, + typechecked("target", "string"), + typechecked("defmode", "string"), + typechecked("show_default", "boolean"), + typechecked("overwrite", "boolean"), + typechecked("argname", "string", "table"), + typechecked("choices", "table"), + typechecked("hidden", "boolean"), + option_action, + option_init +}, Argument) + +function Parser:_inherit_property(name, default) + local element = self + + while true do + local value = element["_" .. name] + + if value ~= nil then + return value + end + + if not element._parent then + return default + end + + element = element._parent + end +end + +function Argument:_get_argument_list() + local buf = {} + local i = 1 + + while i <= math.min(self._minargs, 3) do + local argname = self:_get_argname(i) + + if self._default and self._defmode:find "a" then + argname = "[" .. argname .. "]" + end + + table.insert(buf, argname) + i = i+1 + end + + while i <= math.min(self._maxargs, 3) do + table.insert(buf, "[" .. self:_get_argname(i) .. "]") + i = i+1 + + if self._maxargs == math.huge then + break + end + end + + if i < self._maxargs then + table.insert(buf, "...") + end + + return buf +end + +function Argument:_get_usage() + local usage = table.concat(self:_get_argument_list(), " ") + + if self._default and self._defmode:find "u" then + if self._maxargs > 1 or (self._minargs == 1 and not self._defmode:find "a") then + usage = "[" .. usage .. "]" + end + end + + return usage +end + +function actions.store_true(result, target) + result[target] = true +end + +function actions.store_false(result, target) + result[target] = false +end + +function actions.store(result, target, argument) + result[target] = argument +end + +function actions.count(result, target, _, overwrite) + if not overwrite then + result[target] = result[target] + 1 + end +end + +function actions.append(result, target, argument, overwrite) + result[target] = result[target] or {} + table.insert(result[target], argument) + + if overwrite then + table.remove(result[target], 1) + end +end + +function actions.concat(result, target, arguments, overwrite) + if overwrite then + error("'concat' action can't handle too many invocations") + end + + result[target] = result[target] or {} + + for _, argument in ipairs(arguments) do + table.insert(result[target], argument) + end +end + +function Argument:_get_action() + local action, init + + if self._maxcount == 1 then + if self._maxargs == 0 then + action, init = "store_true", nil + else + action, init = "store", nil + end + else + if self._maxargs == 0 then + action, init = "count", 0 + else + action, init = "append", {} + end + end + + if self._action then + action = self._action + end + + if self._has_init then + init = self._init + end + + if type(action) == "string" then + action = actions[action] + end + + return action, init +end + +-- Returns placeholder for `narg`-th argument. +function Argument:_get_argname(narg) + local argname = self._argname or self:_get_default_argname() + + if type(argname) == "table" then + return argname[narg] + else + return argname + end +end + +function Argument:_get_choices_list() + return "{" .. table.concat(self._choices, ",") .. "}" +end + +function Argument:_get_default_argname() + if self._choices then + return self:_get_choices_list() + else + return "<" .. self._name .. ">" + end +end + +function Option:_get_default_argname() + if self._choices then + return self:_get_choices_list() + else + return "<" .. self:_get_default_target() .. ">" + end +end + +-- Returns labels to be shown in the help message. +function Argument:_get_label_lines() + if self._choices then + return {self:_get_choices_list()} + else + return {self._name} + end +end + +function Option:_get_label_lines() + local argument_list = self:_get_argument_list() + + if #argument_list == 0 then + -- Don't put aliases for simple flags like `-h` on different lines. + return {table.concat(self._public_aliases, ", ")} + end + + local longest_alias_length = -1 + + for _, alias in ipairs(self._public_aliases) do + longest_alias_length = math.max(longest_alias_length, #alias) + end + + local argument_list_repr = table.concat(argument_list, " ") + local lines = {} + + for i, alias in ipairs(self._public_aliases) do + local line = (" "):rep(longest_alias_length - #alias) .. alias .. " " .. argument_list_repr + + if i ~= #self._public_aliases then + line = line .. "," + end + + table.insert(lines, line) + end + + return lines +end + +function Command:_get_label_lines() + return {table.concat(self._public_aliases, ", ")} +end + +function Argument:_get_description() + if self._default and self._show_default then + if self._description then + return ("%s (default: %s)"):format(self._description, self._default) + else + return ("default: %s"):format(self._default) + end + else + return self._description or "" + end +end + +function Command:_get_description() + return self._summary or self._description or "" +end + +function Option:_get_usage() + local usage = self:_get_argument_list() + table.insert(usage, 1, self._name) + usage = table.concat(usage, " ") + + if self._mincount == 0 or self._default then + usage = "[" .. usage .. "]" + end + + return usage +end + +function Argument:_get_default_target() + return self._name +end + +function Option:_get_default_target() + local res + + for _, alias in ipairs(self._public_aliases) do + if alias:sub(1, 1) == alias:sub(2, 2) then + res = alias:sub(3) + break + end + end + + res = res or self._name:sub(2) + return (res:gsub("-", "_")) +end + +function Option:_is_vararg() + return self._maxargs ~= self._minargs +end + +function Parser:_get_fullname(exclude_root) + local parent = self._parent + if exclude_root and not parent then + return "" + end + local buf = {self._name} + + while parent do + if not exclude_root or parent._parent then + table.insert(buf, 1, parent._name) + end + parent = parent._parent + end + + return table.concat(buf, " ") +end + +function Parser:_update_charset(charset) + charset = charset or {} + + for _, command in ipairs(self._commands) do + command:_update_charset(charset) + end + + for _, option in ipairs(self._options) do + for _, alias in ipairs(option._aliases) do + charset[alias:sub(1, 1)] = true + end + end + + return charset +end + +function Parser:argument(...) + local argument = Argument(...) + table.insert(self._arguments, argument) + return argument +end + +function Parser:option(...) + local option = Option(...) + table.insert(self._options, option) + return option +end + +function Parser:flag(...) + return self:option():args(0)(...) +end + +function Parser:command(...) + local command = Command():add_help(true)(...) + command._parent = self + table.insert(self._commands, command) + return command +end + +function Parser:mutex(...) + local elements = {...} + + for i, element in ipairs(elements) do + local mt = getmetatable(element) + assert(mt == Option or mt == Argument, ("bad argument #%d to 'mutex' (Option or Argument expected)"):format(i)) + end + + table.insert(self._mutexes, elements) + return self +end + +function Parser:group(name, ...) + assert(type(name) == "string", ("bad argument #1 to 'group' (string expected, got %s)"):format(type(name))) + + local group = {name = name, ...} + + for i, element in ipairs(group) do + local mt = getmetatable(element) + assert(mt == Option or mt == Argument or mt == Command, + ("bad argument #%d to 'group' (Option or Argument or Command expected)"):format(i + 1)) + end + + table.insert(self._groups, group) + return self +end + +local usage_welcome = "Usage: " + +function Parser:get_usage() + if self._usage then + return self._usage + end + + local usage_margin = self:_inherit_property("usage_margin", #usage_welcome) + local max_usage_width = self:_inherit_property("usage_max_width", 70) + local lines = {usage_welcome .. self:_get_fullname()} + + local function add(s) + if #lines[#lines]+1+#s <= max_usage_width then + lines[#lines] = lines[#lines] .. " " .. s + else + lines[#lines+1] = (" "):rep(usage_margin) .. s + end + end + + -- Normally options are before positional arguments in usage messages. + -- However, vararg options should be after, because they can't be reliable used + -- before a positional argument. + -- Mutexes come into play, too, and are shown as soon as possible. + -- Overall, output usages in the following order: + -- 1. Mutexes that don't have positional arguments or vararg options. + -- 2. Options that are not in any mutexes and are not vararg. + -- 3. Positional arguments - on their own or as a part of a mutex. + -- 4. Remaining mutexes. + -- 5. Remaining options. + + local elements_in_mutexes = {} + local added_elements = {} + local added_mutexes = {} + local argument_to_mutexes = {} + + local function add_mutex(mutex, main_argument) + if added_mutexes[mutex] then + return + end + + added_mutexes[mutex] = true + local buf = {} + + for _, element in ipairs(mutex) do + if not element._hidden and not added_elements[element] then + if getmetatable(element) == Option or element == main_argument then + table.insert(buf, element:_get_usage()) + added_elements[element] = true + end + end + end + + if #buf == 1 then + add(buf[1]) + elseif #buf > 1 then + add("(" .. table.concat(buf, " | ") .. ")") + end + end + + local function add_element(element) + if not element._hidden and not added_elements[element] then + add(element:_get_usage()) + added_elements[element] = true + end + end + + for _, mutex in ipairs(self._mutexes) do + local is_vararg = false + local has_argument = false + + for _, element in ipairs(mutex) do + if getmetatable(element) == Option then + if element:_is_vararg() then + is_vararg = true + end + else + has_argument = true + argument_to_mutexes[element] = argument_to_mutexes[element] or {} + table.insert(argument_to_mutexes[element], mutex) + end + + elements_in_mutexes[element] = true + end + + if not is_vararg and not has_argument then + add_mutex(mutex) + end + end + + for _, option in ipairs(self._options) do + if not elements_in_mutexes[option] and not option:_is_vararg() then + add_element(option) + end + end + + -- Add usages for positional arguments, together with one mutex containing them, if they are in a mutex. + for _, argument in ipairs(self._arguments) do + -- Pick a mutex as a part of which to show this argument, take the first one that's still available. + local mutex + + if elements_in_mutexes[argument] then + for _, argument_mutex in ipairs(argument_to_mutexes[argument]) do + if not added_mutexes[argument_mutex] then + mutex = argument_mutex + end + end + end + + if mutex then + add_mutex(mutex, argument) + else + add_element(argument) + end + end + + for _, mutex in ipairs(self._mutexes) do + add_mutex(mutex) + end + + for _, option in ipairs(self._options) do + add_element(option) + end + + if #self._commands > 0 then + if self._require_command then + add("<command>") + else + add("[<command>]") + end + + add("...") + end + + return table.concat(lines, "\n") +end + +local function split_lines(s) + if s == "" then + return {} + end + + local lines = {} + + if s:sub(-1) ~= "\n" then + s = s .. "\n" + end + + for line in s:gmatch("([^\n]*)\n") do + table.insert(lines, line) + end + + return lines +end + +local function autowrap_line(line, max_length) + -- Algorithm for splitting lines is simple and greedy. + local result_lines = {} + + -- Preserve original indentation of the line, put this at the beginning of each result line. + -- If the first word looks like a list marker ('*', '+', or '-'), add spaces so that starts + -- of the second and the following lines vertically align with the start of the second word. + local indentation = line:match("^ *") + + if line:find("^ *[%*%+%-]") then + indentation = indentation .. " " .. line:match("^ *[%*%+%-]( *)") + end + + -- Parts of the last line being assembled. + local line_parts = {} + + -- Length of the current line. + local line_length = 0 + + -- Index of the next character to consider. + local index = 1 + + while true do + local word_start, word_finish, word = line:find("([^ ]+)", index) + + if not word_start then + -- Ignore trailing spaces, if any. + break + end + + local preceding_spaces = line:sub(index, word_start - 1) + index = word_finish + 1 + + if (#line_parts == 0) or (line_length + #preceding_spaces + #word <= max_length) then + -- Either this is the very first word or it fits as an addition to the current line, add it. + table.insert(line_parts, preceding_spaces) -- For the very first word this adds the indentation. + table.insert(line_parts, word) + line_length = line_length + #preceding_spaces + #word + else + -- Does not fit, finish current line and put the word into a new one. + table.insert(result_lines, table.concat(line_parts)) + line_parts = {indentation, word} + line_length = #indentation + #word + end + end + + if #line_parts > 0 then + table.insert(result_lines, table.concat(line_parts)) + end + + if #result_lines == 0 then + -- Preserve empty lines. + result_lines[1] = "" + end + + return result_lines +end + +-- Automatically wraps lines within given array, +-- attempting to limit line length to `max_length`. +-- Existing line splits are preserved. +local function autowrap(lines, max_length) + local result_lines = {} + + for _, line in ipairs(lines) do + local autowrapped_lines = autowrap_line(line, max_length) + + for _, autowrapped_line in ipairs(autowrapped_lines) do + table.insert(result_lines, autowrapped_line) + end + end + + return result_lines +end + +function Parser:_get_element_help(element) + local label_lines = element:_get_label_lines() + local description_lines = split_lines(element:_get_description()) + + local result_lines = {} + + -- All label lines should have the same length (except the last one, it has no comma). + -- If too long, start description after all the label lines. + -- Otherwise, combine label and description lines. + + local usage_margin_len = self:_inherit_property("help_usage_margin", 3) + local usage_margin = (" "):rep(usage_margin_len) + local description_margin_len = self:_inherit_property("help_description_margin", 25) + local description_margin = (" "):rep(description_margin_len) + + local help_max_width = self:_inherit_property("help_max_width") + + if help_max_width then + local description_max_width = math.max(help_max_width - description_margin_len, 10) + description_lines = autowrap(description_lines, description_max_width) + end + + if #label_lines[1] >= (description_margin_len - usage_margin_len) then + for _, label_line in ipairs(label_lines) do + table.insert(result_lines, usage_margin .. label_line) + end + + for _, description_line in ipairs(description_lines) do + table.insert(result_lines, description_margin .. description_line) + end + else + for i = 1, math.max(#label_lines, #description_lines) do + local label_line = label_lines[i] + local description_line = description_lines[i] + + local line = "" + + if label_line then + line = usage_margin .. label_line + end + + if description_line and description_line ~= "" then + line = line .. (" "):rep(description_margin_len - #line) .. description_line + end + + table.insert(result_lines, line) + end + end + + return table.concat(result_lines, "\n") +end + +local function get_group_types(group) + local types = {} + + for _, element in ipairs(group) do + types[getmetatable(element)] = true + end + + return types +end + +function Parser:_add_group_help(blocks, added_elements, label, elements) + local buf = {label} + + for _, element in ipairs(elements) do + if not element._hidden and not added_elements[element] then + added_elements[element] = true + table.insert(buf, self:_get_element_help(element)) + end + end + + if #buf > 1 then + table.insert(blocks, table.concat(buf, ("\n"):rep(self:_inherit_property("help_vertical_space", 0) + 1))) + end +end + +function Parser:get_help() + if self._help then + return self._help + end + + local blocks = {self:get_usage()} + + local help_max_width = self:_inherit_property("help_max_width") + + if self._description then + local description = self._description + + if help_max_width then + description = table.concat(autowrap(split_lines(description), help_max_width), "\n") + end + + table.insert(blocks, description) + end + + -- 1. Put groups containing arguments first, then other arguments. + -- 2. Put remaining groups containing options, then other options. + -- 3. Put remaining groups containing commands, then other commands. + -- Assume that an element can't be in several groups. + local groups_by_type = { + [Argument] = {}, + [Option] = {}, + [Command] = {} + } + + for _, group in ipairs(self._groups) do + local group_types = get_group_types(group) + + for _, mt in ipairs({Argument, Option, Command}) do + if group_types[mt] then + table.insert(groups_by_type[mt], group) + break + end + end + end + + local default_groups = { + {name = "Arguments", type = Argument, elements = self._arguments}, + {name = "Options", type = Option, elements = self._options}, + {name = "Commands", type = Command, elements = self._commands} + } + + local added_elements = {} + + for _, default_group in ipairs(default_groups) do + local type_groups = groups_by_type[default_group.type] + + for _, group in ipairs(type_groups) do + self:_add_group_help(blocks, added_elements, group.name .. ":", group) + end + + local default_label = default_group.name .. ":" + + if #type_groups > 0 then + default_label = "Other " .. default_label:gsub("^.", string.lower) + end + + self:_add_group_help(blocks, added_elements, default_label, default_group.elements) + end + + if self._epilog then + local epilog = self._epilog + + if help_max_width then + epilog = table.concat(autowrap(split_lines(epilog), help_max_width), "\n") + end + + table.insert(blocks, epilog) + end + + return table.concat(blocks, "\n\n") +end + +function Parser:add_help_command(value) + if value then + assert(type(value) == "string" or type(value) == "table", + ("bad argument #1 to 'add_help_command' (string or table expected, got %s)"):format(type(value))) + end + + local help = self:command() + :description "Show help for commands." + help:argument "command" + :description "The command to show help for." + :args "?" + :action(function(_, _, cmd) + if not cmd then + print(self:get_help()) + os.exit(0) + else + for _, command in ipairs(self._commands) do + for _, alias in ipairs(command._aliases) do + if alias == cmd then + print(command:get_help()) + os.exit(0) + end + end + end + end + help:error(("unknown command '%s'"):format(cmd)) + end) + + if value then + help = help(value) + end + + if not help._name then + help "help" + end + + help._is_help_command = true + return self +end + +function Parser:_is_shell_safe() + if self._basename then + if self._basename:find("[^%w_%-%+%.]") then + return false + end + else + for _, alias in ipairs(self._aliases) do + if alias:find("[^%w_%-%+%.]") then + return false + end + end + end + for _, option in ipairs(self._options) do + for _, alias in ipairs(option._aliases) do + if alias:find("[^%w_%-%+%.]") then + return false + end + end + if option._choices then + for _, choice in ipairs(option._choices) do + if choice:find("[%s'\"]") then + return false + end + end + end + end + for _, argument in ipairs(self._arguments) do + if argument._choices then + for _, choice in ipairs(argument._choices) do + if choice:find("[%s'\"]") then + return false + end + end + end + end + for _, command in ipairs(self._commands) do + if not command:_is_shell_safe() then + return false + end + end + return true +end + +function Parser:add_complete(value) + if value then + assert(type(value) == "string" or type(value) == "table", + ("bad argument #1 to 'add_complete' (string or table expected, got %s)"):format(type(value))) + end + + local complete = self:option() + :description "Output a shell completion script for the specified shell." + :args(1) + :choices {"bash", "zsh", "fish"} + :action(function(_, _, shell) + io.write(self["get_" .. shell .. "_complete"](self)) + os.exit(0) + end) + + if value then + complete = complete(value) + end + + if not complete._name then + complete "--completion" + end + + return self +end + +function Parser:add_complete_command(value) + if value then + assert(type(value) == "string" or type(value) == "table", + ("bad argument #1 to 'add_complete_command' (string or table expected, got %s)"):format(type(value))) + end + + local complete = self:command() + :description "Output a shell completion script." + complete:argument "shell" + :description "The shell to output a completion script for." + :choices {"bash", "zsh", "fish"} + :action(function(_, _, shell) + io.write(self["get_" .. shell .. "_complete"](self)) + os.exit(0) + end) + + if value then + complete = complete(value) + end + + if not complete._name then + complete "completion" + end + + return self +end + +local function base_name(pathname) + return pathname:gsub("[/\\]*$", ""):match(".*[/\\]([^/\\]*)") or pathname +end + +local function get_short_description(element) + local short = element:_get_description():match("^(.-)%.%s") + return short or element:_get_description():match("^(.-)%.?$") +end + +function Parser:_get_options() + local options = {} + for _, option in ipairs(self._options) do + for _, alias in ipairs(option._aliases) do + table.insert(options, alias) + end + end + return table.concat(options, " ") +end + +function Parser:_get_commands() + local commands = {} + for _, command in ipairs(self._commands) do + for _, alias in ipairs(command._aliases) do + table.insert(commands, alias) + end + end + return table.concat(commands, " ") +end + +function Parser:_bash_option_args(buf, indent) + local opts = {} + for _, option in ipairs(self._options) do + if option._choices or option._minargs > 0 then + local compreply + if option._choices then + compreply = 'COMPREPLY=($(compgen -W "' .. table.concat(option._choices, " ") .. '" -- "$cur"))' + else + compreply = 'COMPREPLY=($(compgen -f -- "$cur"))' + end + table.insert(opts, (" "):rep(indent + 4) .. table.concat(option._aliases, "|") .. ")") + table.insert(opts, (" "):rep(indent + 8) .. compreply) + table.insert(opts, (" "):rep(indent + 8) .. "return 0") + table.insert(opts, (" "):rep(indent + 8) .. ";;") + end + end + + if #opts > 0 then + table.insert(buf, (" "):rep(indent) .. 'case "$prev" in') + table.insert(buf, table.concat(opts, "\n")) + table.insert(buf, (" "):rep(indent) .. "esac\n") + end +end + +function Parser:_bash_get_cmd(buf, indent) + if #self._commands == 0 then + return + end + + table.insert(buf, (" "):rep(indent) .. 'args=("${args[@]:1}")') + table.insert(buf, (" "):rep(indent) .. 'for arg in "${args[@]}"; do') + table.insert(buf, (" "):rep(indent + 4) .. 'case "$arg" in') + + for _, command in ipairs(self._commands) do + table.insert(buf, (" "):rep(indent + 8) .. table.concat(command._aliases, "|") .. ")") + if self._parent then + table.insert(buf, (" "):rep(indent + 12) .. 'cmd="$cmd ' .. command._name .. '"') + else + table.insert(buf, (" "):rep(indent + 12) .. 'cmd="' .. command._name .. '"') + end + table.insert(buf, (" "):rep(indent + 12) .. 'opts="$opts ' .. command:_get_options() .. '"') + command:_bash_get_cmd(buf, indent + 12) + table.insert(buf, (" "):rep(indent + 12) .. "break") + table.insert(buf, (" "):rep(indent + 12) .. ";;") + end + + table.insert(buf, (" "):rep(indent + 4) .. "esac") + table.insert(buf, (" "):rep(indent) .. "done") +end + +function Parser:_bash_cmd_completions(buf) + local cmd_buf = {} + if self._parent then + self:_bash_option_args(cmd_buf, 12) + end + if #self._commands > 0 then + table.insert(cmd_buf, (" "):rep(12) .. 'COMPREPLY=($(compgen -W "' .. self:_get_commands() .. '" -- "$cur"))') + elseif self._is_help_command then + table.insert(cmd_buf, (" "):rep(12) + .. 'COMPREPLY=($(compgen -W "' + .. self._parent:_get_commands() + .. '" -- "$cur"))') + end + if #cmd_buf > 0 then + table.insert(buf, (" "):rep(8) .. "'" .. self:_get_fullname(true) .. "')") + table.insert(buf, table.concat(cmd_buf, "\n")) + table.insert(buf, (" "):rep(12) .. ";;") + end + + for _, command in ipairs(self._commands) do + command:_bash_cmd_completions(buf) + end +end + +function Parser:get_bash_complete() + self._basename = base_name(self._name) + assert(self:_is_shell_safe()) + local buf = {([[ +_%s() { + local IFS=$' \t\n' + local args cur prev cmd opts arg + args=("${COMP_WORDS[@]}") + cur="${COMP_WORDS[COMP_CWORD]}" + prev="${COMP_WORDS[COMP_CWORD-1]}" + opts="%s" +]]):format(self._basename, self:_get_options())} + + self:_bash_option_args(buf, 4) + self:_bash_get_cmd(buf, 4) + if #self._commands > 0 then + table.insert(buf, "") + table.insert(buf, (" "):rep(4) .. 'case "$cmd" in') + self:_bash_cmd_completions(buf) + table.insert(buf, (" "):rep(4) .. "esac\n") + end + + table.insert(buf, ([=[ + if [[ "$cur" = -* ]]; then + COMPREPLY=($(compgen -W "$opts" -- "$cur")) + fi +} + +complete -F _%s -o bashdefault -o default %s +]=]):format(self._basename, self._basename)) + + return table.concat(buf, "\n") +end + +function Parser:_zsh_arguments(buf, cmd_name, indent) + if self._parent then + table.insert(buf, (" "):rep(indent) .. "options=(") + table.insert(buf, (" "):rep(indent + 2) .. "$options") + else + table.insert(buf, (" "):rep(indent) .. "local -a options=(") + end + + for _, option in ipairs(self._options) do + local line = {} + if #option._aliases > 1 then + if option._maxcount > 1 then + table.insert(line, '"*"') + end + table.insert(line, "{" .. table.concat(option._aliases, ",") .. '}"') + else + table.insert(line, '"') + if option._maxcount > 1 then + table.insert(line, "*") + end + table.insert(line, option._name) + end + if option._description then + local description = get_short_description(option):gsub('["%]:`$]', "\\%0") + table.insert(line, "[" .. description .. "]") + end + if option._maxargs == math.huge then + table.insert(line, ":*") + end + if option._choices then + table.insert(line, ": :(" .. table.concat(option._choices, " ") .. ")") + elseif option._maxargs > 0 then + table.insert(line, ": :_files") + end + table.insert(line, '"') + table.insert(buf, (" "):rep(indent + 2) .. table.concat(line)) + end + + table.insert(buf, (" "):rep(indent) .. ")") + table.insert(buf, (" "):rep(indent) .. "_arguments -s -S \\") + table.insert(buf, (" "):rep(indent + 2) .. "$options \\") + + if self._is_help_command then + table.insert(buf, (" "):rep(indent + 2) .. '": :(' .. self._parent:_get_commands() .. ')" \\') + else + for _, argument in ipairs(self._arguments) do + local spec + if argument._choices then + spec = ": :(" .. table.concat(argument._choices, " ") .. ")" + else + spec = ": :_files" + end + if argument._maxargs == math.huge then + table.insert(buf, (" "):rep(indent + 2) .. '"*' .. spec .. '" \\') + break + end + for _ = 1, argument._maxargs do + table.insert(buf, (" "):rep(indent + 2) .. '"' .. spec .. '" \\') + end + end + + if #self._commands > 0 then + table.insert(buf, (" "):rep(indent + 2) .. '": :_' .. cmd_name .. '_cmds" \\') + table.insert(buf, (" "):rep(indent + 2) .. '"*:: :->args" \\') + end + end + + table.insert(buf, (" "):rep(indent + 2) .. "&& return 0") +end + +function Parser:_zsh_cmds(buf, cmd_name) + table.insert(buf, "\n_" .. cmd_name .. "_cmds() {") + table.insert(buf, " local -a commands=(") + + for _, command in ipairs(self._commands) do + local line = {} + if #command._aliases > 1 then + table.insert(line, "{" .. table.concat(command._aliases, ",") .. '}"') + else + table.insert(line, '"' .. command._name) + end + if command._description then + table.insert(line, ":" .. get_short_description(command):gsub('["`$]', "\\%0")) + end + table.insert(buf, " " .. table.concat(line) .. '"') + end + + table.insert(buf, ' )\n _describe "command" commands\n}') +end + +function Parser:_zsh_complete_help(buf, cmds_buf, cmd_name, indent) + if #self._commands == 0 then + return + end + + self:_zsh_cmds(cmds_buf, cmd_name) + table.insert(buf, "\n" .. (" "):rep(indent) .. "case $words[1] in") + + for _, command in ipairs(self._commands) do + local name = cmd_name .. "_" .. command._name + table.insert(buf, (" "):rep(indent + 2) .. table.concat(command._aliases, "|") .. ")") + command:_zsh_arguments(buf, name, indent + 4) + command:_zsh_complete_help(buf, cmds_buf, name, indent + 4) + table.insert(buf, (" "):rep(indent + 4) .. ";;\n") + end + + table.insert(buf, (" "):rep(indent) .. "esac") +end + +function Parser:get_zsh_complete() + self._basename = base_name(self._name) + assert(self:_is_shell_safe()) + local buf = {("#compdef %s\n"):format(self._basename)} + local cmds_buf = {} + table.insert(buf, "_" .. self._basename .. "() {") + if #self._commands > 0 then + table.insert(buf, " local context state state_descr line") + table.insert(buf, " typeset -A opt_args\n") + end + self:_zsh_arguments(buf, self._basename, 2) + self:_zsh_complete_help(buf, cmds_buf, self._basename, 2) + table.insert(buf, "\n return 1") + table.insert(buf, "}") + + local result = table.concat(buf, "\n") + if #cmds_buf > 0 then + result = result .. "\n" .. table.concat(cmds_buf, "\n") + end + return result .. "\n\n_" .. self._basename .. "\n" +end + +local function fish_escape(string) + return string:gsub("[\\']", "\\%0") +end + +function Parser:_fish_get_cmd(buf, indent) + if #self._commands == 0 then + return + end + + table.insert(buf, (" "):rep(indent) .. "set -e cmdline[1]") + table.insert(buf, (" "):rep(indent) .. "for arg in $cmdline") + table.insert(buf, (" "):rep(indent + 4) .. "switch $arg") + + for _, command in ipairs(self._commands) do + table.insert(buf, (" "):rep(indent + 8) .. "case " .. table.concat(command._aliases, " ")) + table.insert(buf, (" "):rep(indent + 12) .. "set cmd $cmd " .. command._name) + command:_fish_get_cmd(buf, indent + 12) + table.insert(buf, (" "):rep(indent + 12) .. "break") + end + + table.insert(buf, (" "):rep(indent + 4) .. "end") + table.insert(buf, (" "):rep(indent) .. "end") +end + +function Parser:_fish_complete_help(buf, basename) + local prefix = "complete -c " .. basename + table.insert(buf, "") + + for _, command in ipairs(self._commands) do + local aliases = table.concat(command._aliases, " ") + local line + if self._parent then + line = ("%s -n '__fish_%s_using_command %s' -xa '%s'") + :format(prefix, basename, self:_get_fullname(true), aliases) + else + line = ("%s -n '__fish_%s_using_command' -xa '%s'"):format(prefix, basename, aliases) + end + if command._description then + line = ("%s -d '%s'"):format(line, fish_escape(get_short_description(command))) + end + table.insert(buf, line) + end + + if self._is_help_command then + local line = ("%s -n '__fish_%s_using_command %s' -xa '%s'") + :format(prefix, basename, self:_get_fullname(true), self._parent:_get_commands()) + table.insert(buf, line) + end + + for _, option in ipairs(self._options) do + local parts = {prefix} + + if self._parent then + table.insert(parts, "-n '__fish_" .. basename .. "_seen_command " .. self:_get_fullname(true) .. "'") + end + + for _, alias in ipairs(option._aliases) do + if alias:match("^%-.$") then + table.insert(parts, "-s " .. alias:sub(2)) + elseif alias:match("^%-%-.+") then + table.insert(parts, "-l " .. alias:sub(3)) + end + end + + if option._choices then + table.insert(parts, "-xa '" .. table.concat(option._choices, " ") .. "'") + elseif option._minargs > 0 then + table.insert(parts, "-r") + end + + if option._description then + table.insert(parts, "-d '" .. fish_escape(get_short_description(option)) .. "'") + end + + table.insert(buf, table.concat(parts, " ")) + end + + for _, command in ipairs(self._commands) do + command:_fish_complete_help(buf, basename) + end +end + +function Parser:get_fish_complete() + self._basename = base_name(self._name) + assert(self:_is_shell_safe()) + local buf = {} + + if #self._commands > 0 then + table.insert(buf, ([[ +function __fish_%s_print_command + set -l cmdline (commandline -poc) + set -l cmd]]):format(self._basename)) + self:_fish_get_cmd(buf, 4) + table.insert(buf, ([[ + echo "$cmd" +end + +function __fish_%s_using_command + test (__fish_%s_print_command) = "$argv" + and return 0 + or return 1 +end + +function __fish_%s_seen_command + string match -q "$argv*" (__fish_%s_print_command) + and return 0 + or return 1 +end]]):format(self._basename, self._basename, self._basename, self._basename)) + end + + self:_fish_complete_help(buf, self._basename) + return table.concat(buf, "\n") .. "\n" +end + +local function get_tip(context, wrong_name) + local context_pool = {} + local possible_name + local possible_names = {} + + for name in pairs(context) do + if type(name) == "string" then + for i = 1, #name do + possible_name = name:sub(1, i - 1) .. name:sub(i + 1) + + if not context_pool[possible_name] then + context_pool[possible_name] = {} + end + + table.insert(context_pool[possible_name], name) + end + end + end + + for i = 1, #wrong_name + 1 do + possible_name = wrong_name:sub(1, i - 1) .. wrong_name:sub(i + 1) + + if context[possible_name] then + possible_names[possible_name] = true + elseif context_pool[possible_name] then + for _, name in ipairs(context_pool[possible_name]) do + possible_names[name] = true + end + end + end + + local first = next(possible_names) + + if first then + if next(possible_names, first) then + local possible_names_arr = {} + + for name in pairs(possible_names) do + table.insert(possible_names_arr, "'" .. name .. "'") + end + + table.sort(possible_names_arr) + return "\nDid you mean one of these: " .. table.concat(possible_names_arr, " ") .. "?" + else + return "\nDid you mean '" .. first .. "'?" + end + else + return "" + end +end + +local ElementState = class({ + invocations = 0 +}) + +function ElementState:__call(state, element) + self.state = state + self.result = state.result + self.element = element + self.target = element._target or element:_get_default_target() + self.action, self.result[self.target] = element:_get_action() + return self +end + +function ElementState:error(fmt, ...) + self.state:error(fmt, ...) +end + +function ElementState:convert(argument, index) + local converter = self.element._convert + + if converter then + local ok, err + + if type(converter) == "function" then + ok, err = converter(argument) + elseif type(converter[index]) == "function" then + ok, err = converter[index](argument) + else + ok = converter[argument] + end + + if ok == nil then + self:error(err and "%s" or "malformed argument '%s'", err or argument) + end + + argument = ok + end + + return argument +end + +function ElementState:default(mode) + return self.element._defmode:find(mode) and self.element._default +end + +local function bound(noun, min, max, is_max) + local res = "" + + if min ~= max then + res = "at " .. (is_max and "most" or "least") .. " " + end + + local number = is_max and max or min + return res .. tostring(number) .. " " .. noun .. (number == 1 and "" or "s") +end + +function ElementState:set_name(alias) + self.name = ("%s '%s'"):format(alias and "option" or "argument", alias or self.element._name) +end + +function ElementState:invoke() + self.open = true + self.overwrite = false + + if self.invocations >= self.element._maxcount then + if self.element._overwrite then + self.overwrite = true + else + local num_times_repr = bound("time", self.element._mincount, self.element._maxcount, true) + self:error("%s must be used %s", self.name, num_times_repr) + end + else + self.invocations = self.invocations + 1 + end + + self.args = {} + + if self.element._maxargs <= 0 then + self:close() + end + + return self.open +end + +function ElementState:check_choices(argument) + if self.element._choices then + for _, choice in ipairs(self.element._choices) do + if argument == choice then + return + end + end + local choices_list = "'" .. table.concat(self.element._choices, "', '") .. "'" + local is_option = getmetatable(self.element) == Option + self:error("%s%s must be one of %s", is_option and "argument for " or "", self.name, choices_list) + end +end + +function ElementState:pass(argument) + self:check_choices(argument) + argument = self:convert(argument, #self.args + 1) + table.insert(self.args, argument) + + if #self.args >= self.element._maxargs then + self:close() + end + + return self.open +end + +function ElementState:complete_invocation() + while #self.args < self.element._minargs do + self:pass(self.element._default) + end +end + +function ElementState:close() + if self.open then + self.open = false + + if #self.args < self.element._minargs then + if self:default("a") then + self:complete_invocation() + else + if #self.args == 0 then + if getmetatable(self.element) == Argument then + self:error("missing %s", self.name) + elseif self.element._maxargs == 1 then + self:error("%s requires an argument", self.name) + end + end + + self:error("%s requires %s", self.name, bound("argument", self.element._minargs, self.element._maxargs)) + end + end + + local args + + if self.element._maxargs == 0 then + args = self.args[1] + elseif self.element._maxargs == 1 then + if self.element._minargs == 0 and self.element._mincount ~= self.element._maxcount then + args = self.args + else + args = self.args[1] + end + else + args = self.args + end + + self.action(self.result, self.target, args, self.overwrite) + end +end + +local ParseState = class({ + result = {}, + options = {}, + arguments = {}, + argument_i = 1, + element_to_mutexes = {}, + mutex_to_element_state = {}, + command_actions = {} +}) + +function ParseState:__call(parser, error_handler) + self.parser = parser + self.error_handler = error_handler + self.charset = parser:_update_charset() + self:switch(parser) + return self +end + +function ParseState:error(fmt, ...) + self.error_handler(self.parser, fmt:format(...)) +end + +function ParseState:switch(parser) + self.parser = parser + + if parser._action then + table.insert(self.command_actions, {action = parser._action, name = parser._name}) + end + + for _, option in ipairs(parser._options) do + option = ElementState(self, option) + table.insert(self.options, option) + + for _, alias in ipairs(option.element._aliases) do + self.options[alias] = option + end + end + + for _, mutex in ipairs(parser._mutexes) do + for _, element in ipairs(mutex) do + if not self.element_to_mutexes[element] then + self.element_to_mutexes[element] = {} + end + + table.insert(self.element_to_mutexes[element], mutex) + end + end + + for _, argument in ipairs(parser._arguments) do + argument = ElementState(self, argument) + table.insert(self.arguments, argument) + argument:set_name() + argument:invoke() + end + + self.handle_options = parser._handle_options + self.argument = self.arguments[self.argument_i] + self.commands = parser._commands + + for _, command in ipairs(self.commands) do + for _, alias in ipairs(command._aliases) do + self.commands[alias] = command + end + end +end + +function ParseState:get_option(name) + local option = self.options[name] + + if not option then + self:error("unknown option '%s'%s", name, get_tip(self.options, name)) + else + return option + end +end + +function ParseState:get_command(name) + local command = self.commands[name] + + if not command then + if #self.commands > 0 then + self:error("unknown command '%s'%s", name, get_tip(self.commands, name)) + else + self:error("too many arguments") + end + else + return command + end +end + +function ParseState:check_mutexes(element_state) + if self.element_to_mutexes[element_state.element] then + for _, mutex in ipairs(self.element_to_mutexes[element_state.element]) do + local used_element_state = self.mutex_to_element_state[mutex] + + if used_element_state and used_element_state ~= element_state then + self:error("%s can not be used together with %s", element_state.name, used_element_state.name) + else + self.mutex_to_element_state[mutex] = element_state + end + end + end +end + +function ParseState:invoke(option, name) + self:close() + option:set_name(name) + self:check_mutexes(option, name) + + if option:invoke() then + self.option = option + end +end + +function ParseState:pass(arg) + if self.option then + if not self.option:pass(arg) then + self.option = nil + end + elseif self.argument then + self:check_mutexes(self.argument) + + if not self.argument:pass(arg) then + self.argument_i = self.argument_i + 1 + self.argument = self.arguments[self.argument_i] + end + else + local command = self:get_command(arg) + self.result[command._target or command._name] = true + + if self.parser._command_target then + self.result[self.parser._command_target] = command._name + end + + self:switch(command) + end +end + +function ParseState:close() + if self.option then + self.option:close() + self.option = nil + end +end + +function ParseState:finalize() + self:close() + + for i = self.argument_i, #self.arguments do + local argument = self.arguments[i] + if #argument.args == 0 and argument:default("u") then + argument:complete_invocation() + else + argument:close() + end + end + + if self.parser._require_command and #self.commands > 0 then + self:error("a command is required") + end + + for _, option in ipairs(self.options) do + option.name = option.name or ("option '%s'"):format(option.element._name) + + if option.invocations == 0 then + if option:default("u") then + option:invoke() + option:complete_invocation() + option:close() + end + end + + local mincount = option.element._mincount + + if option.invocations < mincount then + if option:default("a") then + while option.invocations < mincount do + option:invoke() + option:close() + end + elseif option.invocations == 0 then + self:error("missing %s", option.name) + else + self:error("%s must be used %s", option.name, bound("time", mincount, option.element._maxcount)) + end + end + end + + for i = #self.command_actions, 1, -1 do + self.command_actions[i].action(self.result, self.command_actions[i].name) + end +end + +function ParseState:parse(args) + for _, arg in ipairs(args) do + local plain = true + + if self.handle_options then + local first = arg:sub(1, 1) + + if self.charset[first] then + if #arg > 1 then + plain = false + + if arg:sub(2, 2) == first then + if #arg == 2 then + if self.options[arg] then + local option = self:get_option(arg) + self:invoke(option, arg) + else + self:close() + end + + self.handle_options = false + else + local equals = arg:find "=" + if equals then + local name = arg:sub(1, equals - 1) + local option = self:get_option(name) + + if option.element._maxargs <= 0 then + self:error("option '%s' does not take arguments", name) + end + + self:invoke(option, name) + self:pass(arg:sub(equals + 1)) + else + local option = self:get_option(arg) + self:invoke(option, arg) + end + end + else + for i = 2, #arg do + local name = first .. arg:sub(i, i) + local option = self:get_option(name) + self:invoke(option, name) + + if i ~= #arg and option.element._maxargs > 0 then + self:pass(arg:sub(i + 1)) + break + end + end + end + end + end + end + + if plain then + self:pass(arg) + end + end + + self:finalize() + return self.result +end + +function Parser:error(msg) + io.stderr:write(("%s\n\nError: %s\n"):format(self:get_usage(), msg)) + os.exit(1) +end + +-- Compatibility with strict.lua and other checkers: +local default_cmdline = rawget(_G, "arg") or {} + +function Parser:_parse(args, error_handler) + return ParseState(self, error_handler):parse(args or default_cmdline) +end + +function Parser:parse(args) + return self:_parse(args, self.error) +end + +local function xpcall_error_handler(err) + return tostring(err) .. "\noriginal " .. debug.traceback("", 2):sub(2) +end + +function Parser:pparse(args) + local parse_error + + local ok, result = xpcall(function() + return self:_parse(args, function(_, err) + parse_error = err + error(err, 0) + end) + end, xpcall_error_handler) + + if ok then + return true, result + elseif not parse_error then + error(result, 0) + else + return false, parse_error + end +end + +local argparse = {} + +argparse.version = "0.7.1" + +setmetatable(argparse, {__call = function(_, ...) + return Parser(default_cmdline[0]):add_help(true)(...) +end}) + +return argparse |