!	 $Id: functions,v 1.11 2007-11-08 16:02:34 f Exp $
!
! Copyright (c) 1990-2001  Michael Sandrof, Troy Rollo, Matthew Green,
! and other ircII contributors.
!
! All rights reserved.  See the HELP SCROLLZ COPYRIGHT file for more
! information.
!
ScrollZ Functions
  ScrollZ functions are substituted with the format $FUNCTION(arguments).
  A function is an ALIAS which assigns a value to FUNCTION_RETURN.
  For example:
    ALIAS DOUBLE assign FUNCTION_RETURN ${[$0]+[$0]}
  which is the same as:
    ALIAS DOUBLE @ function_return = [$0] * 2
  used with:
    ALIAS SHOWDOUBLE echo $DOUBLE($0)
  will cause
    SHOWDOUBLE 7
  to display "14".

  The following built-in functions already exist and cannot be overriden:
  (n!u@h stands for nick!user@host)

  CDCCSLOTS()           Returns the number of free Cdcc slots
  CDCCQSLOTS()          Returns the number of free Cdcc queue slots
  CHATPEERS()           Returns the list of nicks who you have dcc-chat
                        connections with, in format nick,nick2,...
                        Useful if you want to broadcast.
  CHANUSERS(channel X)  Returns a list of users on channel.
                        If X is 1 every nick returned will have a status
                        character prepended to it:
                        @ - chanop
                        + - voiced
                        % - halfopped
                        . - other
  CHECKUSER(n!u@h channel) Returns user flags, filter and channels
                        for userlist entry matching n!u@h and channel
                        or -1 on error
  CHECKSHIT(n!u@h channel) Returns user flags, filter and channels
                        for shitlist entry matching n!u@h and channel
                        or -1 on error
  CHR(LIST)             Returns string from a list of ascii codes
  CLOSE(HANDLE)         Closes the file denoted by HANDLE.
  COLOR(STRING)         STRING can be two numbers in which case the first
                        number is the event and the second number is in
                        range from 1 to 6. In this case the color number
                        matching second number is returned from the colors
                        defined for the event matching first number. See
                        also COLOR.
                        Additionally you can specify color mnemonics:
                        normal, bold, underline, flash, reverse, black,
                        red, green, yellow, blue, purple, cyan, white,
                        blackbg, redbg, greenbg, yellowbg, bluebg,
                        purplebg, cyanbg, whitebg or nobold (this one
                        turns all bold off).
  CONNECT(HOST PORT)    Returns the file descriptor for the connection.
                        A NULL fd means host could not be resolved.
                        Negative fd means some error occurred in the attempt.
                        Communication through the connection is done with 
                        DCC RAW and ON DCC_RAW.
                        (See DCC RAW and ON DCC_RAW)
  COUNTRY(CODE)         Returns the country name for CODE.
                        Example: $country(fi)
  CURPOS()              Returns the postition from the start of the input line
                        to where the cursor is now.
  CRYPT(salt key)       Crypts the input using the BSD crypt() function.
                        There is no way of decrypting the result. This
                        could be used for password crypting in a bot.
                        (Note that this function is available
                        only if the system libraries contain it.)
  DCCLIST(nick)         Returns a list of dcc operations for specified nick.
                        The list is a string which consists of two-character
                        constants, where first char is one of:
                              (C)hat, (S)end, (G)et, (T)alk, s(U)mmon,
                              raw_(L)isten and (R)aw.
                        Second char is one of:
                              (C)losed, (A)ctive, (W)aiting, (O)ffered.
                        You can use this for example to detect if
                        you have a dcc-chat connection to someone.
                        Returns 0 if you don't specify nick.
  DECODE(encoded text)  Decode a single STRING of text produced by ENCODE()
                        into it's original characters.  Note that these are
                        case sensitive.
  EOF(HANDLE)           Returns non-zero if end-of-file indicator is set
                        for file denoted by HANDLE.
  ENCODE(input text)    Convert input text to an encoded string suitable for
                        use as an ScrollZ variable or alias name.  Any special
                        including spaces can be encoded into the string.
  FILESTAT(filename)    Performs a stat(2) on the specified filename.  The
			returned values are size, uid, gid, mode and filename.
  FSIZE(FILENAME)       Returns the filesize for FILENAME. The FILENAME is
                        expanded before checking - you can use ~ in the
                        filename to denote your home dir.
  HASVOICE(nick channel) Returns 1 if nick has voice on the given channel.
                        Note that if the person is an operator on the given
                        channel, this function is unreliable: It returns 1.
  HHOST(u@h)            Returns the host from user@host
  IDLE()                Returns the number of seconds since the last keyboard
                        activity.
  IGNORED(NICK TYPE)    Returns "ignored", "highlighted", "dont" or "0",
                        depending on what ignore action will be applied to
                        this NICK and TYPE of ignorance.  TYPE must be one
                        of MSGS, PUBLIC, WALLS, WALLOPS, INVITES, NOTICES,
                        NOTES, CTCP, CRAP, PART, JOIN, NICK or QUIT.
  INDEX(CHARLIST STRING) Returns the index to the first character in STRING
                        which appears in CHARLIST. If the first char in
                        CHARLIST is a '^' returns the index to first char in
                        STRING *NOT* in CHARLIST.
  ISCHANNEL(word)       Returns 1 if word is a valid channel name.
  ISCHANOP(nick channel) Returns 1 if nick is a chanop on the given channel.
  LEFT(COUNT STRING)    Returns the COUNT leftmost bytes from the STRING.
  LISTEN(PORT)          Creates a listening socket on the specified port.
                        If the port # is not specified then it returns the 
                        number of the port it chose arbitrarily.  It cannot
                        open a port# < 1025
  MATCH(PATTERN WORDS)  Returns an index into the list of WORDS of the first
                        match for the given PATTERN. Returns 1 if it matches
                        the first word, 0 if it matches none.
  MID(INDEX COUNT STRING) Returns COUNT bytes starting at position INDEX
                        in STRING.
  MYCHANNELS(refnum)    Returns a string with a list of channels on that
                        windows server. (defaults to current window)
  MYSERVERS()           Returns a string of the names of the servers
                        you are connected to.
  NOTIFY(TYPE)          Returns either the TYPE "here", "gone" or "all"
                        lists, default being "here".
  ONCHANNEL(nick channel) Returns 1 if nick is on channel
  OPEN(F r|w|a)         Opens the file F and returns its handle. File
                        mode is one of:
                        r - read
                        w - write
                        a - append
  PATTERN(PATTERN WORDS) Returns all words from a list that are matched
                        by a pattern
                        the first word, 0 if it matches none.
  PID()                 Returns the current process ID.
  PPID()                Returns the current parent process iD.
  QUERYNICK(refnum)     Returns the nick, if any, that the window is queried
                        to.
  RAND(LIMIT)           Returns a random number x such that 0<=x<LIMIT
  READ(HANDLE)          Returns one line from file denoted by HANDLE.
  REGEXP(PATTERN STRING) Returns 1 if STRING matches given PATTERN, 0 if there is
                        no match. POSIX.2 regular expressions are supported.
  REGEXPREP(PATTERN STRING) Performs search & replace using POSIX.2 regular
                        expressions supporting up to 10 back references in $# style,
                        example:
                        REGEXPREP("/a (.*) c (.*)/$$1 $$2/" a b c d) would return
                        b d
  RENAME(OLD NEW)       Renames file OLD to NEW.
  RIGHT(COUNT STRING)   Returns the COUNT rightmost bytes from the STRING.
  RINDEX(CHARLIST STRING) Returns the index to the last character in STRING
                        which appears in CHARLIST.
  RMATCH(WORD PATTERNS) Returns an index into the list of PATTERNS of the
                        pattern which best matches the given WORD. Returns
                        1 for the first pattern, 0 for none.
  SAR(C/S/R/D)          Search and replace. C is a command:
                        r - treat D as variable name, return the replaced
                            data to the variable
                        g - replace all instances
                        S is search string, R is replace string.
                        Examples: $sar(/doe/beavis/john doe)
                                  $sar(r/doe/beavis/foo)
  SCREENS()             Returns a list of the current screen.
  SERVERTYPE()          Returns server version ("IRC2.X", where X is a number,
                        or "IRC Unknown" if unrecognized)
  SRAND(SEED)           Seeds the random number generator and returns nothing.
                        The seed may be a long integer, although only the low
                        integer is used.
  STIME(TIMEVAL)        Returns the date and time in English that corresponds
                        to the long integer TIMEVAL.
  STRFTIME(time format) Returns a string with the time formatted according
                        to the given format.
                        (Note that this function is available
                        only if the system libraries contain it.)
  STRIP(CHARLIST STRING) Returns the STRING with all occurrences of characters
                        listed in CHARLIST removed.
  STRIPANSI(STRING)     Returns the STRING with all ANSI color sequences
                        removed from it
  STRIPCRAP(STRING)     Returns the STRING with all non-printable characters
                        removed from it
  STRLEN(STRING)        Returns the length of STRING
  STRNUM(STRING)        Returns the number of words in STRING
  STRSTR(STR1 STR2)     Returns the substring STR2 in STR1
                        Example: $STRSTR(/JOHN DOE/DOE)
  SZVAR(VARNAME)        Returns value of ScrollZ variable VARNAME
                        All ScrollZ variables which are not modifyable
                        through SET can be queried this way. The
                        VARNAME matches the command name, example:
                        $szvar(nhprot). For the Cdcc variables don't
                        put a space between Cdcc and command name,
                        example: $szvar(cdcclongstatus).
  TDIFF(TIME_INTERVAL)  Takes a TIME_INTERVAL in seconds and returns it in 
                        the format.. dd days hh hours mm minutes ss seconds
                        Any fields with 00 are omitted.
  TIME()                Returns the current system time as a long integer
  TOPIC(CHANNEL)        Returns the topic for CHANNEL, time the topic was
                        set and who set the topic.
  TOUPPER(string)       Convert string to upper case.
  TOLOWER(string)       Convert string to lower case.
  TR(/set1/set2/string) Returns translated string where character from set1 is
                        replaced with character on the same position in set2
  UH(nickname)          Returns nick!user@host for given nickname or -1
                        if the information is not available
  UHOST(n!u@h)          Returns the user@host from nick!user@host
  URL(NUMBER [string])  Returns URL NUMBER from internally stored URLs
                        If string is not empty it also returns source of URL
  USERHOST()            Returns the user@host value under which the current
                        message was sent if you are on a 2.7 server or better.
  WINDOWS()             Returns a list of the current windows.
  WINNUM()              Returns the current window number.  This is always 
                        the window which is indicated by STATUS_WINDOW.
  WINNAM()              Returns the current window name.
                        This is always the window which is indicated by 
                        STATUS_WINDOW.  If the window has no name, it returns
                        nothing.
  WINCOLS()             Returns the number columns in this window, or -1 if
                        this can not be determined.
  WINROWS()             Returns the number rows in this window, or -1 if
                        this can not be determined.
  WINVIS()              Returns 1 if the window is currently visible.
  WINSERVER()           Returns the server associated with the window.
  WINSERVERGROUP()      Returns the server group associated with the window.
  WORD(INDEX WORDS)     Returns the single word in the list of WORDS pointed
                        to by INDEX.
  WRITE(HANDLE TEXT)    Writes TEXT to file denoted by HANDLE.
  SHELLFIX(input text)  Convert input text so that it can safely be passed
                        to a command line program without unexpected side
                        effects commonly used to hack the user's shell.
  URLENCODE(input text) Convert input text so that it can be used as part of
                        an url, for example as a query parameter when executing
                        lynx. Note that you may have to SHELLFIX() also.

Note:
  The argument separator for functions is the space character, not the comma.

See Also:
  ALIAS SZVAR
