functions [ {+|-}UkmtTuz ] [ -x num ] [ name ... ]
functions -M mathfn [ min [ max [ shellfn ] ] ]
functions -M [ -m pattern ... ]
functions +M [ -m ] mathfn ...
       Equivalent to typeset -f, with the exception of the  -x  and  -M
       options.

       The -x option indicates that any functions output will have each
       leading tab for indentation, added by the shell to show  syntac-
       tic  structure, expanded to the given number num of spaces.  num
       can also be 0 to suppress all indentation.

       Use of the -M option may not be combined with any of the options
       handled by typeset -f.

       functions -M mathfn defines mathfn as the name of a mathematical
       function recognised in all forms  of  arithmetical  expressions;
       see  the  section  `Arithmetic  Evaluation'  in  zshmisc(1).  By
       default mathfn may take any number of comma-separated arguments.
       If  min  is given, it must have exactly min args; if min and max
       are both given, it must have at least min and at most max  args.
       max may be -1 to indicate that there is no upper limit.

       By  default  the  function is implemented by a shell function of
       the same name; if shellfn is specified it gives the name of  the
       corresponding  shell function while mathfn remains the name used
       in arithmetical expressions.  The name of the function in $0  is
       mathfn  (not shellfn as would usually be the case), provided the
       option FUNCTION_ARGZERO is in effect.  The positional parameters
       in  the shell function correspond to the arguments of the mathe-
       matical function call.  The  result  of  the  last  arithmetical
       expression  evaluated inside the shell function (even if it is a
       form that normally only returns a status) gives  the  result  of
       the mathematical function.

       functions -M with no arguments lists all such user-defined func-
       tions in the same form as a  definition.   With  the  additional
       option  -m  and  a list of arguments, all functions whose mathfn
       matches one of the pattern arguments are listed.

       function +M removes the list of mathematical functions; with the
       additional  option  -m the arguments are treated as patterns and
       all functions whose mathfn  matches  the  pattern  are  removed.
       Note  that  the shell function implementing the behaviour is not
       removed (regardless of whether its name coincides with mathfn).

       For example, the following prints the cube of 3:

              zmath_cube() { (( $1 * $1 * $1 )) }
              functions -M cube 1 1 zmath_cube
              print $(( cube(3) ))

autoload [ {+|-}TUXkmtz ] [ -w ] [ name ... ]
       Equivalent to functions -u, with the exception of -X/+X and -w.

       The flag -X may be used only inside a shell  function,  and  may
       not be followed by a name.  It causes the calling function to be
       marked for autoloading and then immediately loaded and executed,
       with  the  current  array of positional parameters as arguments.
       This replaces the previous definition of the  function.   If  no
       function  definition is found, an error is printed and the func-
       tion remains undefined and marked for autoloading.

       The flag +X attempts to load each name as  an  autoloaded  func-
       tion,  but  does  not execute it.  The exit status is zero (suc-
       cess) if the function was not previously defined and  a  defini-
       tion for it was found.  This does not replace any existing defi-
       nition of the function.  The exit status is nonzero (failure) if
       the  function  was  already  defined  or  when no definition was
       found.  In the latter case the function  remains  undefined  and
       marked  for  autoloading.   If ksh-style autoloading is enabled,
       the function created will contain the contents of the file  plus
       a call to the function itself appended to it, thus giving normal
       ksh autoloading behaviour on the first call to the function.  If
       the  -m flag is also given each name is treated as a pattern and
       all functions already marked for autoload that match the pattern
       are loaded.

       With the -w flag, the names are taken as names of files compiled
       with the zcompile builtin, and all functions defined in them are
       marked for autoloading.

       The flags -z and -k mark the function to be autoloaded using the
       zsh or ksh style, as if the option KSH_AUTOLOAD  were  unset  or
       were  set,  respectively.  The flags override the setting of the
       option at the time the function is loaded.

       Note that the autoload command makes no attempt  to  ensure  the
       shell  options  set  during the loading or execution of the file
       have any particular value.  For this, the emulate command can be
       used:

              emulate zsh -c 'autoload -Uz func'

       arranges  that  when  func  is loaded the shell is in native zsh
       emulation, and this emulation is also applied when func is run.
