module Arg:sig..end
This module provides a general mechanism for extracting options and arguments from the command line to the program.
   Syntax of command lines:
    A keyword is a character string starting with a -.
    An option is a keyword alone or followed by an argument.
    The types of keywords are: Unit, Bool, Set, Clear,
    String, Set_string, Int, Set_int, Float, Set_float,
    Tuple, Symbol, and Rest.
    Unit, Set and Clear keywords take no argument. A Rest
    keyword takes the remaining of the command line as arguments.
    Every other keyword takes the following word on the command line
    as argument.  For compatibility with GNU getopt_long, keyword=arg
    is also allowed.
    Arguments not preceded by a keyword are called anonymous arguments.
   Examples (cmd is assumed to be the command name):
cmd -flag           (a unit option)cmd -int 1          (an int option with argument 1)cmd -string foobar  (a string option with argument "foobar")cmd -float 12.34    (a float option with argument 12.34)cmd a b c           (three anonymous arguments: "a", "b", and "c")cmd a b -- c d      (two anonymous arguments and a rest option with
                           two arguments)type | | | Unit of  | (* | 
Call the function with unit argument | *) | 
| | | Bool of  | (* | 
Call the function with a bool argument | *) | 
| | | Set of  | (* | 
Set the reference to true | *) | 
| | | Clear of  | (* | 
Set the reference to false | *) | 
| | | String of  | (* | 
Call the function with a string argument | *) | 
| | | Set_string of  | (* | 
Set the reference to the string argument | *) | 
| | | Int of  | (* | 
Call the function with an int argument | *) | 
| | | Set_int of  | (* | 
Set the reference to the int argument | *) | 
| | | Float of  | (* | 
Call the function with a float argument | *) | 
| | | Set_float of  | (* | 
Set the reference to the float argument | *) | 
| | | Tuple of  | (* | 
Take several arguments according to the
                                   spec list | *) | 
| | | Symbol of  | (* | 
Take one of the symbols as argument and
                                   call the function with the symbol | *) | 
| | | Rest of  | (* | 
Stop interpreting keywords and call the
                                   function with each remaining argument | *) | 
typekey =string
typedoc =string
typeusage_msg =string
typeanon_fun =string -> unit
val parse : (key * spec * doc) list -> anon_fun -> usage_msg -> unitArg.parse speclist anon_fun usage_msg parses the command line.
    speclist is a list of triples (key, spec, doc).
    key is the option keyword, it must start with a '-' character.
    spec gives the option type and the function to call when this option
    is found on the command line.
    doc is a one-line description of this option.
    anon_fun is called on anonymous arguments.
    The functions in spec and anon_fun are called in the same order
    as their arguments appear on the command line.
    If an error occurs, Arg.parse exits the program, after printing
    to standard error an error message as follows:
usage_msgdoc string.
    Beware: options that have an empty doc string will not be included in the
    list.-, include for example ("-", String anon_fun, doc) in speclist.
    By default, parse recognizes two unit options, -help and --help,
    which will print to standard output usage_msg and the list of
    options, and exit the program.  You can override this behaviour
    by specifying your own -help and --help options in speclist.
val parse_dynamic : (key * spec * doc) list ref ->
       anon_fun -> usage_msg -> unitArg.parse, except that the speclist argument is a reference
    and may be updated during the parsing. A typical use for this feature
    is to parse command lines of the form:options
    where the list of options depends on the value of the subcommand argument.val parse_argv : ?current:int ref ->
       string array ->
       (key * spec * doc) list -> anon_fun -> usage_msg -> unitArg.parse_argv ~current args speclist anon_fun usage_msg parses
  the array args as if it were the command line.  It uses and updates
  the value of ~current (if given), or Arg.current.  You must set
  it before calling parse_argv.  The initial value of current
  is the index of the program name (argument 0) in the array.
  If an error occurs, Arg.parse_argv raises Arg.Bad with
  the error message as argument.  If option -help or --help is
  given, Arg.parse_argv raises Arg.Help with the help message
  as argument.val parse_argv_dynamic : ?current:int ref ->
       string array ->
       (key * spec * doc) list ref ->
       anon_fun -> string -> unitArg.parse_argv, except that the speclist argument is a
    reference and may be updated during the parsing.
    See Arg.parse_dynamic.exception Help of string
Arg.parse_argv when the user asks for help.exception Bad of string
spec or anon_fun can raise Arg.Bad with an error
    message to reject invalid arguments.
    Arg.Bad is also raised by Arg.parse_argv in case of an error.val usage : (key * spec * doc) list -> usage_msg -> unitArg.usage speclist usage_msg prints to standard error
    an error message that includes the list of valid options.  This is
    the same message that Arg.parse prints in case of error.
    speclist and usage_msg are the same as for Arg.parse.val usage_string : (key * spec * doc) list -> usage_msg -> stringArg.usage,
    if provided with the same parameters.val align : ?limit:int ->
       (key * spec * doc) list -> (key * spec * doc) listSymbol arguments are aligned on the next line.limit : options with keyword and message longer than
    limit will not be used to compute the alignement.val current : int refSys.argv) of the argument being processed.  You can
    change this value, e.g. to force Arg.parse to skip some arguments.
    Arg.parse uses the initial value of Arg.current as the index of
    argument 0 (the program name) and starts parsing arguments
    at the next element.