#! @PERLPATH@
## (configure will change the top line to the location of perl on your system)
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## cmail $Revision: 3.8 $: a tool to aid playing chess by email
## Copyright (C) 1993  Free Software Foundation, Inc.
##
## cmail is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## cmail is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with cmail; if not, write to the Free Software
## Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
##
## Modified:  $Date: 1995/06/24 04:40:54 $
## Revision:  $Revision: 3.8 $
## Email:     welsh@epcc.ed.ac.uk
## Snailmail: Evan Welsh
##            Edinburgh Parallel Computing Centre
##            JCMB, Kings Buildings
##            The University of Edinburgh
##            Edinburgh EH9 3JZ
##            Scotland
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Print verbose diagnostics for debugging
sub debug {
    if ($DEBUG) {
	local ($old) = select ;	## Remember selected output
	select (logfile) ;
	$| = 1 ;		## Keep it flushed
	print @_ ;		## Print arguments
	select ($old) ;
    }
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Create a directory for storing games in if it doesn't already exist
sub need_chess_dir {
    local ($old) ;

    ## ################################################################# ##
    ## Check for existence of the named chess directory
    ## ################################################################# ##

    if (! (-d "$CMAILDIR")) {

	## ############################################################# ##
	## Ask user for confirmation if attached to tty
	## ############################################################# ##

	if (-t) {
	    $old = select ;	## Remember selected output
	    select (stdout) ;	## Write to standard output
	    $| = 1 ;		## Keep it flushed
	    print (  "CMail directory \"$CMAILDIR\" does not exist."
		   . " Create it? [y/q]: ") ;

	    <tty> ;		## Read response from tty
	    die "Bye!\n" if (/^[qQ].*/) ; ## Quit if q selected

	    select ($old) ;	## Re-select the old output
	}

	## ############################################################# ##
	## Create a cmail directory or die
	## ############################################################# ##

	die "cmail: Can't create CMail directory: \"$CMAILDIR\"\n"
	    unless mkdir ("$CMAILDIR", 511) ;
	print (  "Created cmail directory \"$CMAILDIR\".\n"
	       . "You can move it but remember to set the CMAIL_DIR"
	       . " environment variable.\n") ;
    }

    ## ################################################################# ##
    ## Change to the $CMAILDIR directory whether newly created or not
    ## ################################################################# ##

    die "Couldn't changed directory to \"$CMAILDIR\"\n"
	unless (chdir "$CMAILDIR") ;

    ## ################################################################# ##
    ## Check for existence of the named chess directory
    ## ################################################################# ##

    if (! (-d "$ARCDIR")) {

	## ############################################################# ##
	## Ask user for confirmation if attached to tty
	## ############################################################# ##

	if (-t) {
	    $old = select ;	## Remember selected output
	    select (stdout) ;	## Write to standard output
	    $| = 1 ;		## Keep it flushed
	    print (  "Archive directory \"$ARCDIR\" does not exist."
		   . " Create it? [y/q]: ") ;

	    <tty> ;		## Read response from tty
	    die "Bye!\n" if (/^[qQ].*/) ; ## Quit if q selected

	    select ($old) ;	## Re-select the old output
	}

	## ############################################################# ##
	## Create a chess directory or die
	## ############################################################# ##

	die "cmail: Can't create archive directory: \"$ARCDIR\"\n"
	    unless mkdir ("$ARCDIR", 511) ;
	print (  "Created archive directory \"$ARCDIR\".\n"
	       . "You can move it but remember to set the CMAIL_ARCDIR"
	       . " environment variable.\n") ;
    }
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Parse command-line arguments
sub parse_flags {
    ## ################################################################# ##
    ## Set up defaults from the environment or from hard-wired constants
    ## ################################################################# ##

    $SHOWC       = 0 ;
    $SHOWW       = 0 ;
    $OUTPUT_POS  = $ENV{'CMAIL_OUTPUT_POS'} ;
    $LOGFILE     = $ENV{'CMAIL_LOGFILE'} ;
    $MAILPROG    = $ENV{'CMAIL_MAILPROG'} ;
    $MAILPROG    = "/usr/ucb/Mail" if (   (-x "/usr/ucb/Mail")
				       && (! $MAILPROG)) ;
    $MAILPROG    = "/usr/ucb/mail" if (   (-x "/usr/ucb/mail")
				       && (! $MAILPROG)) ;
    $MAILPROG    = "Mail" unless ($MAILPROG) ;
    $HOMEDIR     = $ENV{'HOME'} ;
    $CMAILDIR	 = $ENV{'CMAIL_DIR'} ;
    $CMAILDIR	 = $ENV{'CHESSDIR'} unless ($CMAILDIR) ;
    $CMAILDIR	 = "$HOMEDIR/Chess" unless ($CMAILDIR) ;
    $CMAILDIR	 = "~/Chess"        unless ($HOMEDIR) ;
    $NUM_GAMES	 = "?" ;
    $NUM_WGAMES	 = "?" ;
    $NUM_BGAMES	 = "?" ;
    $TIME_DELAY	 = $ENV{'CMAIL_TIME_DELAY'} ;
    $TIME_DELAY	 = 0 unless ($TIME_DELAY) ;
    $PW_NAME     = &get_pw_name () ;
    $MY_NNAME	 = $PW_NAME ;
    $MY_NNAME	 = $ENV{'LOGNAME'} unless ($MY_NNAME) ;
    $MY_NNAME	 = $ENV{'USER'} unless ($MY_NNAME) ;
    $MY_NNAME	 = "?" unless ($MY_NNAME) ;
    $PGN_EVENT   = "Email correspondence game" ;
    $PGN_SITE	 = "NET";
    $PGN_ROUND	 = "-";
    $PGN_MODE    = "EM";
    $SEND_MAIL   = 1 ;
    $REMAIL      = 0 ;
    $LOAD_XBOARD = 1 unless $ENV{'CMAIL_NO_XBOARD'} ;
    $REUSE       = 1 ;
    @TD_FLAGS    = ("-td", $TIME_DELAY) ;
    @NCP_FLAGS   = ("-ncp") ;

    ## ################################################################# ##
    ## Define the usage string
    ## ################################################################# ##

    $USAGE = ("cmail
        [-h] [-c] [-w] [-[x]v] [-[x]mail] [-[x]xboard] [-[x]reuse] [-remail] 
        [-game <name>] [-(w|b|)games <number>] [-(me|opp) <short name>]
        [-(w|b|my|opp)name <full name>] [-(w|b|my|opp)na <email>]
        [-dir <directory>] [-arcdir <directory>] [-mailprog <mail program>]
        [-logFile <file>] [-event <event>] [-site <site>] [-round <round>]
	[-mode <mode>]") ;

    ## ################################################################# ##
    ## Overwrite defaults if specified on the command-line
    ## ################################################################# ##

    @UNREC_ARGS = () ;
    while ($ARGV = shift) {
	$UNREC = 0 if ($ARGV =~ /^-/) ;
	if    ("$ARGV" eq "-h")		  {die ("Usage: $USAGE\n")     ;}
	elsif ("$ARGV" eq "-c")		  {$SHOWC       = 1            ;}
	elsif ("$ARGV" eq "-w")		  {$SHOWW       = 1            ;}
	elsif ("$ARGV" eq "-v")		  {$DEBUG       = 1            ;
				           @DEBUG_FLAGS = ("-debug")   ;}
	elsif ("$ARGV" eq "-xv")	  {$DEBUG       = 0            ;
				           $QUIET       = 1            ;}
	elsif ("$ARGV" eq "-mail")	  {$SEND_MAIL   = 1            ;}
	elsif ("$ARGV" eq "-xmail")	  {$SEND_MAIL   = 0            ;}
	elsif ("$ARGV" eq "-xboard")	  {$LOAD_XBOARD = 1            ;}
	elsif ("$ARGV" eq "-xxboard")	  {$LOAD_XBOARD = 0            ;}
	elsif ("$ARGV" eq "-reuse")	  {$REUSE       = 1            ;}
	elsif ("$ARGV" eq "-xreuse")	  {$REUSE       = 0            ;}
	elsif ("$ARGV" eq "-remail")      {$LOAD_XBOARD = 0            ;
					   $SEND_MAIL   = 1            ;
					   $REMAIL      = 1            ;}
	elsif ("$ARGV" eq "-game")	  {$PGN_GAME    = shift        ;}
	elsif ("$ARGV" eq "-games")       {$NUM_GAMES   = shift        ;}
	elsif ("$ARGV" eq "-wgames")      {$NUM_WGAMES  = shift        ;}
	elsif ("$ARGV" eq "-bgames")      {$NUM_BGAMES  = shift        ;}
	elsif ("$ARGV" eq "-me")	  {$MY_NNAME    = shift        ;}
	elsif ("$ARGV" eq "-opp")	  {$OPP_NNAME   = shift        ;}
	elsif ("$ARGV" eq "-myname")	  {$MY_FNAME    = shift        ;}
	elsif ("$ARGV" eq "-oppname")	  {$OPP_FNAME   = shift        ;}
	elsif ("$ARGV" eq "-wname")	  {$WHITE_FNAME	= shift	       ;}
	elsif ("$ARGV" eq "-bname")	  {$BLACK_FNAME	= shift	       ;}
	elsif ("$ARGV" eq "-myna")	  {$MY_ADDRESS  = shift        ;}
	elsif ("$ARGV" eq "-oppna")	  {$OPP_ADDRESS = shift        ;}
	elsif ("$ARGV" eq "-wna")	  {$WHITENA	= shift	       ;}
	elsif ("$ARGV" eq "-bna")	  {$BLACKNA	= shift	       ;}
	elsif ("$ARGV" eq "-dir")	  {$CMAILDIR    = shift        ;}
	elsif ("$ARGV" eq "-arcdir")	  {$ARCDIR      = shift        ;}
	elsif ("$ARGV" eq "-mailprog")	  {$MAILPROG    = shift        ;}
	elsif ("$ARGV" eq "-logFile")     {$LOGFILE     = shift        ;}
	elsif ("$ARGV" =~ /^-(td|timeDelay)$/)
	                                  {@TD_FLAGS    = ($ARGV,
							   shift)      ;}
	elsif ("$ARGV" =~ /^-noChessComputer$/)
	                                  {@NCP_FLAGS   = ($ARGV,
							   shift)      ;}
	elsif ("$ARGV" =~ /^-[x]?ncp$/)	  {@NCP_FLAGS	= ($ARGV)      ;}
	elsif ("$ARGV" eq "-event")	  {@PGN_EVENT	= (shift)      ;}
	elsif ("$ARGV" eq "-site")	  {@PGN_SITE	= (shift)      ;}
	elsif ("$ARGV" eq "-round")	  {@PGN_ROUND	= (shift)      ;}
	elsif ("$ARGV" eq "-mode")	  {@PGN_MODE	= (shift)      ;}
	elsif ("$ARGV" =~ /^-/ || $UNREC) {
	    push(@UNREC_ARGS, $ARGV) ;
	    $UNREC = 1 ;
	} else {
	    die("cmail: Unrecognised flag \"$ARGV\"\nUsage: $USAGE\n") ;
	}
    }

    ## ################################################################# ##
    ## Assign a value to $ARCDIR if not specified on the command line
    ## ################################################################# ##

    $ARCDIR = $ENV{'CMAIL_ARCDIR'} unless ($ARCDIR) ;
    $ARCDIR = $CMAILDIR unless ($ARCDIR) ;
    $ENV{'CMAIL_ARCDIR'} = $ARCDIR ; ## Make sure this is set for xboard

    ## ################################################################# ##
    ## Propagate some CMAIL variables through xboard to the cmail
    ## grandchild so that it uses the same important variables as this one
    ## ################################################################# ##

    $ENV{'CMAIL_MAILPROG'} = $MAILPROG ;
    $ENV{'CMAIL_DIR'}      = $CMAILDIR ;
    $ENV{'CHESSDIR'}       = $CMAILDIR ; ## Make xboard use $CMAILDIR
    $ENV{'CMAIL_ARCDIR'}   = $ARCDIR ;
    if ($LOGFILE) {
	$ENV{'CMAIL_LOGFILE'}  = $LOGFILE ;
    } else {
	$LOGFILE = "&STDERR" ;
    }

    ## ################################################################# ##
    ## Work out how many games of each colour will be played
    ## ################################################################# ##

    die "cmail: Illegal number of games: $NUM_GAMES\n"
	if ($NUM_GAMES < 0) ;
    die "cmail: Illegal number of white games: $NUM_WGAMES\n"
	if ($NUM_WGAMES < 0) ;
    die "cmail: Illegal number of black games: $NUM_BGAMES\n"
	if ($NUM_BGAMES < 0) ;
    if ("$NUM_GAMES" ne "?") {
	if ("$NUM_WGAMES" eq "?") {
	    if ("$NUM_BGAMES" eq "?") {
		$NUM_BGAMES = int($NUM_GAMES / 2) ;
	    }
	    $NUM_WGAMES = $NUM_GAMES - $NUM_BGAMES ;
	} elsif ("$NUM_BGAMES" eq "?") {
	    $NUM_BGAMES = $NUM_GAMES - $NUM_WGAMES ;
	}
    } elsif ("$NUM_WGAMES" eq "?") {
	if ("$NUM_BGAMES" eq "?") {
	    $NUM_GAMES  = 1 ;
	    $NUM_WGAMES = 1 ;
	    $NUM_BGAMES = 0 ;
	} else {
	    $NUM_GAMES  = $NUM_BGAMES ;
	    $NUM_WGAMES = 0 ;
	}
    } else {
	if ("$NUM_BGAMES" eq "?") {
	    $NUM_GAMES  = $NUM_WGAMES ;
	    $NUM_BGAMES = 0 ;
	} else {
	    $NUM_GAMES  = $NUM_WGAMES + $NUM_BGAMES ;
	}
    }
    die "cmail: Illegal number of games: $NUM_GAMES\n"
	if ("$NUM_GAMES" eq "0") ;
    die (  "cmail: Inconsistent numbers of games specified:"
	 . " $NUM_WGAMES + $NUM_BGAMES != $NUM_GAMES\n")
	unless ($NUM_GAMES == $NUM_WGAMES + $NUM_BGAMES) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Initialisation of variables and environment
sub showGPL {
    ## ################################################################# ##
    ## Show copyright notice
    ## ################################################################# ##

    while (<DATA>) {
	last if (/^{END OF GPL COPYRIGHT}$/) ;
	s/\$Revision[:] (.*) \$/$1/ ;
	print ;
    }

    ## ################################################################# ##
    ## Show conditions if requested
    ## ################################################################# ##

    while (<DATA>) {
	last if (/^{END OF GPL CONDITIONS}$/) ;
	print if ($SHOWW) ;
    }

    ## ################################################################# ##
    ## Show warranty if requested
    ## ################################################################# ##

    if ($SHOWC) {
	print "\n" if ($SHOWW) ;
	print while (<DATA>) ;
    }

    
    exit 0 if ($SHOWC || $SHOWW) ; ## Abort if showed conditions or warranty
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Initialisation of variables and environment
sub initialise {
    local ($p) = "[.PRNBQKprnbqk]" ;
    local ($l) = "$p $p $p $p $p $p $p $p\n" ;
    local ($board) = "$l$l$l$l$l$l$l$l" ;
    local ($tp) = ".* to play\n" ;
    $posdiag = "\{--------------\n$board$tp--------------\}\n+" ;

    &parse_flags (@ARGV) ;	## Parse command-line arguments

    &showGPL unless $QUIET ;

    open (tty, "< /dev/tty") ;	## Open tty for reading

    &need_chess_dir () ;	## Check for the existence of CMAILDIR

    open (logfile, ">$LOGFILE") if ($DEBUG) ; ## Default is STDERR

    &debug ("Called <initialise>\n") ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Prompt for a game name, if <cr> use a default
sub prompt_for_game_name {
    &debug ("Called <prompt_for_game_name>\n") ;
    local ($old) = select ;	## Remember the selected output
    select (stdout);		## Prompt goes to stdout
    $| = 1 ;			## Keep it flushed

    print "Game name [<cr> to use default]: " ;
    die "cmail: tty not open\n" unless (-t) ;
    <tty> =~ /(.*)/ ;		## Read line from tty
    $PGN_GAME = "$1" ;		## Assign to game name
    
    select ($old) ;		## Re-select the old output
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Prompt for opponent's address
sub prompt_for_opp_address {
    &debug ("Called <prompt_for_opp_address>\n") ;
    local ($old) = select ;	## Remember the selected output
    select (stdout);		## Prompt goes to stdout
    $| = 1 ;			## Keep it flushed

    ## ################################################################# ##
    ## Prompt for opponent's email address
    ## ################################################################# ##

    print "Opponent's email address: " ;
    die "cmail: tty not open\n" unless (-t) ;
    <tty> =~ /(.*)/ ;
    $OPP_ADDRESS = $1 ;

    ## ################################################################# ##
    ## Use name as default if still blank
    ## ################################################################# ##

    $OPP_ADDRESS = $OPP_NNAME if ("" eq $OPP_ADDRESS) ;
    
    select ($old) ;		## Re-select the old output
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Prompt for opponent's name
sub prompt_for_opp_name {
    &debug ("Called <prompt_for_opp_name>\n") ;
    local ($old) = select ;	## Remember the selected output
    select (stdout) ;		## Prompt goes to stdout
    $| = 1 ;			## Keep it flushed
    print "Opponent's name: " ;

    die "cmail: tty not open\n" unless (-t) ; ## Check tty is open
    <tty> =~ /(.*)/ ;		## Read line from tty
    $OPP_NNAME = $1 ;		## Match!
    die "cmail: Can't proceed without the opponent's name.\n"
	unless ($OPP_NNAME) ;

    select ($old) ;		## Re-select the old output
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Prompt for move
sub prompt_for_move {
    local ($prompt) = shift ;
    local ($pattern) = shift ;
    &debug ("Called <prompt_for_move>\n") ;

    local ($move) = "" ;
    local ($old) = select ;	## Remember the selected output
    select (stdout) ;		## Write to stdout
    $| = 1 ;			## Keep it flushed
    die "cmail: tty not open\n" unless (-t) ; ## Check tty is open

    do {
	print $prompt ;
	<STDIN> =~ /(.*)/ ;	## Read line from tty
	$move = $1 ;		## Match!
    } until ($move =~ /^$pattern$/) ;

    select ($old) ;		## Re-select the old output
    return ($move) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Load the game
sub play_game {
    &debug ("Called <play_game>\n") ;

    $| = 1 ;			## Start flushing output buffer

    ## ################################################################# ##
    ## Load xboard unless inhibited by command-line arguments
    ## ################################################################# ##

    if (($STARTING_NEW_GAME) && ($NUM_WGAMES == 0)) {
	print (  "Bypassing xboard and mailing $NUM_BGAMES empty"
	       . " black games.\n") ;
    } elsif ($LOAD_XBOARD) {
	## ############################################################# ##
	## Remove output file from previous run, but preserve
	## $PGN_GAME.game.out.* because they will be empty black games
	## ############################################################# ##

	unlink "$PGN_GAME.out" ;

	## ############################################################# ##
	## Invoke xboard with loads of flags
	## ############################################################# ##

	if ($PGN_GAME) {
	    if (@ARCHIVE) {
		local ($date) = &get_date_from_games (@ARCHIVE) ;
		$XBOARD_ARGS = join (' ', (("-lgf",
					    "$ARCDIR/$PGN_GAME.$date.archive"),
					   "-ncp",
					   "-xics",
					   @TD_FLAGS,
					   @DEBUG_FLAGS,
					   @UNREC_ARGS)) ;
	    } else {
		$XBOARD_ARGS = join (' ', (("-cmail", $PGN_GAME),
					   @TD_FLAGS,
					   @NCP_FLAGS,
					   "-xics",
					   @DEBUG_FLAGS,
					   @UNREC_ARGS)) ;
	    }
	} else {
	    $PGN_GAME = "unknown.cmail" ;
	    $XBOARD_ARGS = join (' ', (("-lgf", $PGN_GAME),
				       "-ncp",
				       "-xics",
				       @TD_FLAGS,
				       @DEBUG_FLAGS,
				       @UNREC_ARGS)) ;
	    $REUSE = 0 ;
	}

	$LOG_FILE = "$PGN_GAME.log" ;
	&debug ("Invoking xboard with args: $XBOARD_ARGS\n") ;
	$PID_FILE = "$PGN_GAME.pid" ;
	if (   (! $REUSE)
	    || (! (   (-f $PID_FILE)
		   && ($XBOARD_PID = `cat $PID_FILE`)
		   && ("$XBOARD_PID" =~ /^\d+$/)
		   && (kill "SIGUSR1", $XBOARD_PID)))) {
	    print "Loading xboard for game \"$PGN_GAME\"..." ;
#  	    system ("gdb xboard") ;
	    system (  "{ ({ xboard $XBOARD_ARGS & } ;"
		    . "   echo \$! > $PID_FILE ;"
		    . "   wait ;"
		    . "   rm $PID_FILE) & } >$LOG_FILE 2>&1") ;
	    print (  "done.\n"
		   . "If nothing happens look for an error message in\n"
		   . "$CMAILDIR/$LOG_FILE\n") ;
	} else {
	    print ("Revived existing xboard for game \"$PGN_GAME\".\n"
		   . "If nothing happens"
		   . " remove $CMAILDIR/$PID_FILE and try again.\n") ;
	}

	return 1 ;
    }
    return 0 ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Enter moves on tty instead of xboard
sub play_on_tty {
    &debug ("Called <play_on_tty>\n") ;

    local (@results) = @_ ;

    local (@games, $game, $to_play) ;

    ## ################################################################# ##
    ## Check we have access to tty
    ## ################################################################# ##

    if (open(STDIN, '/dev/tty')) {
	## ############################################################# ##
	## Read in games
	## ############################################################# ##
	
	local ($infile) = "$PGN_GAME.game.in" ;
	if (-f $infile) {
	    @games = &get_games_from_file($infile) ;
	    &debug ("Read in games from \"$infile\"\n") ;

	    if (@results) {
		foreach $game (@games) {
		    $result = shift (@results) ;
		    if ($result && ($game =~ /\[Result\s+"[^*]+"\]/)) {
			$game = "" ;
		    }
		}
	    }

	    ## ################################################################# ##
	    ## Accept move on tty for each game in turn
	    ## ################################################################# ##
		
	    local ($comment_orig, $comment, $comment_line,
		   $pos, $move, $normal_move, $action, $result) ;

	    foreach $game (@games) {
		next unless $game ;

		$game =~ s/[\s\n]*[*]?[\s\n]*$// ;
		$pos = "" ;
		$pos = $1 if ($game =~ s/($posdiag)//) ;
		print $game, "\n\n", $pos ;

		($number, $to_play) = &get_to_play ($game) ;

		$comment_orig = "" ;
		$game_nocomment = $game ;
		if ($game_nocomment =~ s/\n?{\n?([^{]*)}$//) {
		    $comment_orig = $1 ;
		    $comment_orig =~ s/([^\n])$/$1\n/ ;
#  		    &debug ("Comment is:\n{\n$comment_orig}\n") ;
		}
		if ($game =~ /\[Result\s+"[^*]+"\]/) {
		    &prompt_for_move ("Game finished, press \"Return\" to continue: ", "") ;
                    next ;
		}

		$tmpgame = $game_nocomment ;
		$comment = $comment_orig ;

	      outer:
		while (1) {
		    if ($game =~ /{\n?.* offers a draw\n?}$/) {
			$move = &prompt_for_move ("Enter move [MOVE/(r)esign/(a)ccept/(c)omment/re(t)ry]: ",
						  "([-a-h0-9PRNBQK][-a-h0-9PRNBQK]+|[ract])") ;
		    } else {
			$move = &prompt_for_move ("Enter move [MOVE/(r)esign/(c)omment/re(t)ry]: ",
						  "([-a-h0-9PRNBQK][-a-h0-9PRNBQK]+|[rct])") ;
		    }
		    $normal_move = 0 ;
		    $result = "" ;
		    if ($move =~ /^\s*r\s*$/i) {
			if ($to_play eq "White") {
			    $result = "0-1" ;
			} else {
			    $result = "1-0" ;
			}
			$move = "\n{$to_play resigns} $result" ;
		    } elsif ($move =~ /^\s*a\s*$/i) {
			$move = "\n{Draw agreed} $result" ;
		    } elsif ($move =~ /^\s*c\s*$/i) {
                        while ($comment_line = &prompt_for_move ("Enter comment: ", ".*")) {
			    $comment .= $comment_line . "\n" ;
                        }
			next ;
		    } elsif ($move =~ /^\s*t\s*$/i) {
			print $game, "\n\n", $pos ;
			$tmpgame = $game_nocomment ;
			$comment = $comment_orig ;
			print "Try again.\n" ;
			next ;
		    } else {
			$normal_move = 1 ;
		    }

		    $tmpgame .= "\n{\n" . $comment . "}" if ($comment) ;
		    if (! $normal_move) {
			$tmpgame .= "$move"  ;
		    } elsif ($to_play eq "White") {
			$tmpgame .= "\n$number. $move"  ;
		    } elsif ($tmpgame =~ /}$/) {
			$tmpgame .= "\n$number. ... $move"  ;
		    } else {
			$tmpgame .= " $move"  ;
		    }

		    $tmpgame =~ s/\[Result\s+"(.*)"\]/[Result "$result"]/ if ($result) ;
		    $comment = "" ;
		  middle:
		    while (1) {
			if ($normal_move) {
			    $action = &prompt_for_move ("Enter action [(d)raw/(c)omment/(s)end/re(t)ry]: ",
							"[dcst]") ;
			} elsif ($result) {
			    $action = &prompt_for_move ("Enter action [(s)end/re(t)ry]: ",
							"[st]") ;
			} else {
			    $action = &prompt_for_move ("Enter action [(c)omment/(s)end/re(t)ry]: ",
							"[cst]") ;
			}
			if ($action =~ /^\s*d\s*$/i) {
			    if ($normal_move) {
				$comment .= "$to_play offers a draw\n" ;

				while (1) {
				    $action = &prompt_for_move ("Enter action [(c)omment/(s)end/re(t)ry]: ",
								"[cst]") ;
				    if ($action =~ /^\s*c\s*$/i) {
					while ($comment_line = &prompt_for_move ("Enter comment: ", ".*")) {
					    $comment .= $comment_line . "\n" ;
                        		}
				        next ;
				    } elsif ($action =~ /^\s*t\s*$/i) {
					print $game, "\n\n", $pos ;
					$tmpgame = $game_nocomment ;
					$comment = $comment_orig ;
					print "Try again.\n" ;
					next outer;
				    } elsif ($action =~ /^\s*s\s*$/i) {
					$tmpgame .= "\n{\n" . $comment . "}" ;
					last middle ;
				    }
				}
			    } else {
				print "You can't offer a draw at this point.\n" ;
				next ;
			    }
			} elsif ($action =~ /^\s*c\s*$/i) {
			    if ($result) {
				print "You can't enter a comment after the game is finished.\n" ;
			    } else {
				while ($comment_line = &prompt_for_move ("Enter comment: ", ".*")) {
				    $comment .= $comment_line . "\n" ;
                        	}
			    }
			    next ;
			} elsif ($action =~ /^\s*t\s*$/i) {
			    print $game, $pos ;
			    $tmpgame = $game_nocomment ;
			    $comment = $comment_orig ;
			    print "Try again.\n" ;
			    next outer;
			} elsif ($action =~ /^\s*s\s*$/i) {
			    $tmpgame .= "\n{\n" . $comment . "}\n" if ($comment) ;
			    last ;
			}
		    }

		    last ;
		}

		$tmpgame .= "\n*" if ($normal_move) ;
		$tmpgame .= "\n\n" ;
		$game = $tmpgame ;
	    }
	} else {
	    die "cmail: No games to be read\n" ;
	}
    } else {
	die "cmail: Can't open tty" ;
    }

    return (@games) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Find the game the user wants by any means possible
sub find_game {
    &debug ("Called <find_game>\n") ;

    ## ################################################################# ##
    ## Ask user for a game name if not already known
    ## ################################################################# ##

    &prompt_for_game_name () if ("" eq "$PGN_GAME") ;

    ## ################################################################# ##
    ## Find out opponent's details
    ## ################################################################# ##

    if ("" eq "$PGN_GAME") {
	## ############################################################# ##
	## Failed to find the game name so construct a default from players
	## ############################################################# ##
	
	&prompt_for_opp_name () if ("" eq "$OPP_NNAME") ; ## Ask user
	die "cmail: Can't proceed without your opponent's short name (-opp)\n"
	    if ("" eq "$OPP_NNAME") ;
	die "cmail: Can't proceed without your own short name (-me)\n"
	    if ("" eq "$MY_NNAME") ;
	if ($NUM_WGAMES > 0) {
	    $PGN_GAME = "$MY_NNAME-vs-$OPP_NNAME" ; ## Construct default
	} else {
	    $PGN_GAME = "$OPP_NNAME-vs-$MY_NNAME" ; ## Construct default
	}
    } elsif (("" eq "$OPP_ADDRESS") && ("" ne "$RETURN_ADDRESS")) {
	$OPP_ADDRESS = $RETURN_ADDRESS ; ## Use return address instead
	&debug (  "Using return address \"$OPP_ADDRESS\""
		. " for opponent address\n") ;
    }

    ## ################################################################# ##
    ## If no $PGN_GAME.game.in file, assume we're starting a new game
    ## ################################################################# ##

    &start_new_game () unless (-f "$PGN_GAME.game.in") ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Get the date
sub get_date {
    local ($the_time) = time ;
    local ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst) =
	localtime ($the_time) ;
    $mon ++ ;
    if ($mon < 10) {
	$mon = "0$mon" ;
    }
    if ($year < 94) {
	$century = 20 ;
    } else {
	$century = 19 ;
    }
    "$century$year.$mon.$mday" ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Start a new game
sub start_new_game {
    print (  "Starting new game"
	   . " -- $NUM_WGAMES as white, $NUM_BGAMES as black.\n") ;
    local ($to_play) = "white" ;
    $move_num = 0 ;
    $STARTING_NEW_GAME = 1 ;

    local (@game) ;

    ## ################################################################# ##
    ## Ask user for opponent's email address if unknown
    ## ################################################################# ##

    &prompt_for_opp_address () if ("" eq "$OPP_ADDRESS") ;

    ## ################################################################# ##
    ## Give up if we haven't got anywhere to send a move to
    ## ################################################################# ##

    die "cmail: Can't proceed without your opponent's email address.\n"
	if ("" eq "$OPP_ADDRESS") ;

    ## ################################################################# ##
    ## Create an empty game file
    ## ################################################################# ##

    open (GAMEFILE, "> $PGN_GAME.game.in") ;
    for ($j = 1; $j <= $NUM_GAMES; $j ++) {
	$PW_GCOS      =  &get_pw_gcos () ;

	$PGN_MYCOL    =  $MY_FNAME ;
	$PGN_MYCOL    =  $PW_GCOS unless $PGN_MYCOL ;
	$PGN_MYCOL    =  $MY_NNAME unless $PGN_MYCOL ;
	$PGN_MYCOLNA  =  $MY_ADDRESS ;
	$PGN_MYCOLNA  =  "?" unless ($PGN_MYCOLNA) ;
				    
	$PGN_OPPCOL   =  $OPP_FNAME ;
	$PGN_OPPCOL   =  "?" unless ($PGN_OPPCOL) ;
	$PGN_OPPCOLNA =  $OPP_ADDRESS ;
	$PGN_OPPCOLNA =  "?" unless ($PGN_OPPCOLNA) ;
	
	if ($j > $NUM_WGAMES) {
	    $PGN_WHITE   = $PGN_OPPCOL ;
	    $PGN_BLACK   = $PGN_MYCOL ;
	    $PGN_WHITENA = $PGN_OPPCOLNA ;
	    $PGN_BLACKNA = $PGN_MYCOLNA ;
	} else {
	    $PGN_WHITE   = $PGN_MYCOL ;
	    $PGN_BLACK   = $PGN_OPPCOL ;
	    $PGN_WHITENA = $PGN_MYCOLNA ;
	    $PGN_BLACKNA = $PGN_OPPCOLNA ;
	}
	
    	## ######################################################### ##
	## If we only have one colour of game then allow command-line 
	## colour specs to override
	## ######################################################### ##
	
	if (! ($NUM_WGAMES && $NUM_BGAMES)) {
	    $PGN_WHITE   = $WHITE_FNAME if ($WHITE_FNAME) ;
	    $PGN_BLACK   = $BLACK_FNAME if ($BLACK_FNAME) ;
	    $PGN_WHITENA = $WHITENA     if ($WHITENA)     ;
	    $PGN_BLACKNA = $BLACKNA     if ($BLACKNA)     ;
	}
	
	$PGN_DATE = &get_date () ;
	$PGN_DATE = "?" unless ($PGN_DATE) ;

	if ($NUM_GAMES > 1) {
	    $SUFFIX = ".$j" ;
	} else {
	    $SUFFIX = "" ;
	}
	@game = ("[Event \"$PGN_EVENT\"]\n",
		 "[Site \"$PGN_SITE\"]\n",
		 "[Date \"$PGN_DATE\"]\n",
		 "[Round \"$PGN_ROUND\"]\n",
		 "[White \"$PGN_WHITE\"]\n",
		 "[Black \"$PGN_BLACK\"]\n",
		 "[Result \"*\"]\n",
		 "[WhiteNA \"$PGN_WHITENA\"]\n",
		 "[BlackNA \"$PGN_BLACKNA\"]\n",
		 "[Mode \"$PGN_MODE\"]\n",
		 "[CmailGameName \"$PGN_GAME$SUFFIX\"]\n\n*\n") ;
	if ($j > $NUM_WGAMES) {
	    open (GAMEOUTFILE, "> $PGN_GAME.game.out.$j") ;
	    print GAMEOUTFILE @game ;
	    close (GAMEOUTFILE) ;
	} else {
	    print GAMEFILE @game ;
	}
    }
    close (GAMEFILE) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Get the password file gcos (full name) entry
sub get_pw_entry {
    local ($name, $passwd, $uid, $gid, $quota, $comment, $gcos, $dir, $shell) =
	getpwuid ($<);
    ($name, $gcos) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Get password file gcos (full name) entry
sub get_pw_gcos {
    local ($PW_GCOS) ;
    if (! $PW_GCOS) {
	($dummy, $PW_GCOS) = &get_pw_entry () ;
	$PW_GCOS =~ s/^\s*([^,()]+[^ ,()])[ ]*[,()].*$/$1/;
	if ($PW_GCOS =~ /^([^,()]+)\s+([^\s,()]+)$/) { ## Multi-word name
	    $PW_GCOS = $2 . ", " . $1 ;
	} elsif ($PW_GCOS !~ /^([^\s,()]+)/) { ## No sensible gcos entry 
	    $PW_GCOS = "" ;
	}			## Else leave it as one word
	&debug ("PW full name is \"$PW_GCOS\"\n");
    }
    return $PW_GCOS ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Get password file user name entry
sub get_pw_name {
    local ($PW_NAME) ;
    ($PW_NAME, $dummy) = &get_pw_entry () ;
    &debug ("PW name is $PW_NAME\n");

    return $PW_NAME ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Analyse the email message
sub analyse_email_message {
    local ($new_result, $delete_result, $unfinished, $finished)
	= (0, 0, 0, 0) ;
    local ($gamefile, @games) ;

    ## ################################################################# ##
    ## Slurp the mail message
    ## ################################################################# ##

    die "cmail: No games on standard input" 
	unless (@games = &get_games_from_file ("STDIN")) ;

    ## ################################################################# ##
    ## Is the message a real cmail message or just a chess game? $PGN_GAME
    ## will have been set by calling get_games_from_file if it's real
    ## ################################################################# ##

    print "Processing game message..." ;

    if ($PGN_GAME) {
	## ############################################################# ##
	## Restore the results file from the archive if
	## necessary. This is helpful if the user pipes in an old
	## message for take-back purposes or whatever.
	## ############################################################# ##

	if (! -f "$PGN_GAME.res") {
	    ## Find what date would have been used to create the archive
	    foreach (@games) {
		if (/\[Date\s"(.*)"\]/) {
		    $date = $1 ;
		    last ;	## Assume all dates are the same
		}
	    }
	    ## Restore results file from archive directory if it exists
	    if ($date && (-f "$ARCDIR/$PGN_GAME.$date.archive")) {
		if (system ("cp",
			    "$ARCDIR/$PGN_GAME.$date.archive",
			    "$PGN_GAME.res")) {
		    print stderr (  "\nWarning: couldn't restore results file"
				  . " from archive\n") ;
		} else {
		    print "restored results file from archive..." ;
		}
	    }
	}

	## ############################################################# ##
	## Find existing results, if any.
	## ############################################################# ##

	local (@results) = &get_games_from_file ("$PGN_GAME.res") ;

	## ############################################################# ##
	## Parse each game
	## ############################################################# ##

	foreach $game (@games) {
	    next unless ($game) ;

	    ($game_name, $game_num) = &get_game_name_and_number ($game) ;

	    $result = 0 ;
	    @game = split("\n", $game) ;
	    foreach (@game) {
		if (/^\[(Black|White)\s*"[?]"\]$/) {
		    $colour = $1;
		    $PW_GCOS = &get_pw_gcos () unless ($PW_GCOS) ;
		    $PW_GCOS = "$MY_NNAME" unless ($PW_GCOS) ;
		    s/".*"/"$PW_GCOS"/ ;
		    &debug ("Changed $colour tag to be $_") ;
		} elsif (/^\[((Black|White)NA)\s*"(.*)"\]$/) {
		    $NA = $3 ;
		    if ($NA eq "?") {
			if ($RETURN_ADDRESS) {
			    $NA = $RETURN_ADDRESS ;
			} else {
			    $NA = "??" ;
			}
			$_ = "[$1 \"$NA\"]" ;
			&debug ("Changed $1 tag.\n") ;
		    }
		    if ($2 eq "White") {
			$PGN_WHITENA = $NA ;
			&debug ("WhiteNA tag is \"$PGN_WHITENA\"\n") ;
		    } else {
			$PGN_BLACKNA = $NA ;
			&debug ("BlackNA tag is \"$PGN_BLACKNA\"\n") ;
		    }
		} elsif (/\[Result\s*"(.*)"\]$/) {
		    if ($1 ne "*") {
			$result = 1 ;
			$finished ++ ;
		    } else {
			$unfinished ++ ;
		    }
		} elsif (/^(.*[^\d]+)?\d+[.]\s*([^\s*]*\s+)?[^\s.*]+(\s*\d+[.]\s*)?[\s*]*$/) {
		    if ($2) {
			$to_play = "white" ;
		    } else {
			$to_play = "black" ;
		    }
		    &debug ("$to_play to play\n") ;
		}
	    }

	    ## ######################################################### ##
	    ## Reconstruct possibly edited game
	    ## ######################################################### ##

	    $game = join ("\n", @game) . "\n\n" ;

	    ## ######################################################### ##
	    ## Build up results array
	    ## ######################################################### ##

	    if ($result) {
		$results[$game_num] = $games[$game_num] ;
		$new_result = 1 ;
	    } elsif ($results[$game_num]) {
		## Deleting a result does actually make sense if the user
		## pipes in an old message for take-back purposes or whatever
		$results[$game_num] = "" ;
		$delete_result = 1 ;
	    }

	    ## ######################################################### ##
	    ## Remove old .out files
	    ## ######################################################### ##

	    unlink <$PGN_GAME.game.out.*> ;

	    ## ######################################################### ##
	    ## Write ongoing games to game file and append new results
	    ## ######################################################### ##

	    die   "cmail: Can't open file for writing:"
		. " \"$CMAILDIR/$PGN_GAME.game.in\"\n"
		unless open (gamefile, ">$PGN_GAME.game.in") ;
	    &debug (@games) ;
	    print gamefile @games ;
	    close (gamefile) ;
	}

	## ############################################################# ##
	## Print how many finished/unfinished games were found
	## ############################################################# ##

	printf ("%d unfinished %s and %d finished %s...",
		$unfinished, ($unfinished == 1) ? "game" : "games",
		$finished, ($finished == 1) ? "game" : "games") ;

	## ############################################################# ##
	## Write results back to results file if there were any results
	## in the input
	## ############################################################# ##
	
	if ($new_result || $delete_result) {
	    die (  "cmail: Can't open results file for writing:"
		 . "\"$CMAILDIR/$PGN_GAME.res\"\n")
		unless open (resfile, ">$PGN_GAME.res") ;
	    print resfile @results ;
	    close (resfile) ;
	}

	## ############################################################# ##
	## Archive results if there are no unfinished games
	## ############################################################# ##
	
	@ARCHIVE = @results unless ($unfinished) ;

	## ############################################################# ##
	## Figure out return address if not known
	## ############################################################# ##

	if (! $RETURN_ADDRESS) {
	    if ($to_play eq "black") {
		$RETURN_ADDRESS = $PGN_WHITENA unless ("$PGN_WHITENA" eq "?") ;
	    } else {
		$RETURN_ADDRESS = $PGN_BLACKNA unless ("$PGN_BLACKNA" eq "?") ;
	    }
	}

	## ############################################################# ##
	## Decide to include position diagrams in output if not already
	## decided and a position diagram was found in the input
	## ############################################################# ##

	if ("$OUTPUT_POS" eq "") {
	    if (grep (/$posdiag/, @games)) {
		$OUTPUT_POS = "y" ; # Output position only if it was input
	    } else {
		$OUTPUT_POS = "n" ;
	    }
	}
	$ENV{'CMAIL_OUTPUT_POS'} = $OUTPUT_POS ;

	## ############################################################# ##
	## Check that we have enough info about the players to continue
	## ############################################################# ##

	&find_game () ;
    } else {
	## ############################################################# ##
	## Set up xboard for viewing non-cmail PGN file
	## ############################################################# ##

	local ($file) = "unknown.cmail" ;
	print "done.\nDumping non-cmail file into $CMAILDIR/$file..." ;

	die "cmail: Can't open file for writing: \"$CMAILDIR/$file\"\n"
	    unless open (gamefile, ">$file") ;
	print gamefile @games ;
	close (gamefile) ;
    }

    print "done.\n" ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Sort two filenames by the numeric suffix
sub sort_by_numeric_suffix {
    $a =~ /[.](\d+)$/ ; local ($na) = $1 ;
    $b =~ /[.](\d+)$/ ; local ($nb) = $1 ;

    return ($na <=> $nb) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
sub get_game_name_and_number {
    local ($game) = join ("\n", @_) ;

    local ($game_name, $game_num) ;

    die "CMailGameName tag missing\n"
	unless ($game =~ /\[C[Mm]ailGameName\s+"(.*)"\]/) ;

    ## ################################################################# ##
    ## Set game name and number
    ## ################################################################# ##

    $game_name = $1 ;
    if ($game_name =~ s/^(.*)[.](\d+)$/$1/) {
	$game_num = $2 ;
    } else {
	$game_num = 1 ;
    }

    ## ################################################################# ##
    ## Set $PGN_GAME as a side-effect or check validity
    ## ################################################################# ##

    if ($PGN_GAME) {
	die (  "cmail: Mismatched game names in input message:\n"
	     . "\"$PGN_GAME\", \"$game_name\"\n")
	    if ("$PGN_GAME" ne "$game_name") ;
    } else {
	$PGN_GAME = $game_name ;
	&debug ("PGN_GAME set to \"$PGN_GAME\"\n") ;
    }

    return ($game_name, $game_num) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Read in a file of games and split into separate games
sub get_games_from_file {
    local ($file) = shift ;

    local (@file, $first_line) ; ## Slurp stdin
    if ($file eq "STDIN") {
	if ($first_line = <STDIN>) { ## Necessary to handle no input case
	    @file = <STDIN> ; ## Slurp stdin
	    @file = ($first_line, @file) ;

	    foreach (@file) {
		## Strip off leading quotation characters
		s/^[^\s]*>// ;
		s/^[ \t]+// ;
		
		## Find return address and set it as a side-effect
		if (   /^From:?.*<([^>]+)>.*\n$/
		    || /^From:? *([^ ]*).*\n$/) {
		    $RETURN_ADDRESS = $1 ; ## Default for opp's email
		    &debug ("Found opponent's email address",
			    " \"$RETURN_ADDRESS\"\n") ;
		} elsif (/\[C[Mm]ailGameName\s+"(.*)"\]/) {
		    $PGN_GAME =  $1 ;
		    $PGN_GAME =~ s/[.]\d+$// ;
		}
	    }

	    return (@file) unless ($PGN_GAME) ;
	    if (grep (/\{--------------|\[Event/, @file)) {
		shift (@file) while ($file[0] !~ /\{--------------|\[Event/) ;
	    }
	} else {
	    return () ;
	}
    } else {
	return () unless (open (file, "<$file")) ;
    
	@file = <file> ; ## Slurp file
	close (file) ;
    }
    
    local (@games, $game_name, $game_num, $game, $tag) ;

    ## ################################################################# ##
    ## Remove headers and leading blanks
    ## ################################################################# ##

    local (@tgames) = split (/($posdiag\[Event|\[Event)/, join ('', @file)) ;
    shift (@tgames) while (!$tgames[0]) ;

    ## ################################################################# ##
    ## Set up @games array with proper game numbers
    ## ################################################################# ##

    while (@tgames) {
	$game = shift (@tgames) . shift (@tgames) ;

	($game_name, $game_num) = &get_game_name_and_number ($game) ;
	$games[$game_num] = $game ;
    }

    return (@games) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Analyse output files and send the move
sub send_move {
    &debug ("Called <send_move>\n") ;

    ## ################################################################# ##
    ## Cat the pos (if it exists), game and result (if it exists) files
    ## into the .out file.
    ## ################################################################# ##
    
    local ($unfinished, $finished) = (0, 0) ;
    local (@results, $move, $move_msg, $to_play, $number) ;
   
    ## ################################################################# ##
    ## Find any .game.out.* files
    ## ################################################################# ##

    local (@outfiles) = (<$PGN_GAME.game.out.*>) ;
    @outfiles = grep (/[.]\d+$/, @outfiles) ; ## Ignore autosave files
    @outfiles = sort sort_by_numeric_suffix @outfiles ; ## Sort

    ## ################################################################# ##
    ## Find .res file if it exists
    ## ################################################################# ##

    local ($resfile) = "$PGN_GAME.res" ;
    if (-f $resfile) {
	@results = &get_games_from_file($resfile) ;
	&debug ("Read in results\n") ;
    } else {
	@results = () ;
	&debug ("No results to read\n") ;
    }

    ## ################################################################# ##
    ## Find .out file if it exists
    ## ################################################################# ##

    local ($outfile) = "$PGN_GAME.out" ;
    if (! ($REMAIL || $LOAD_XBOARD)) {
	@games = &play_on_tty (@results) ;
    } elsif (@outfiles) {
	foreach (@outfiles) {
	    die "Can't open game file \"$_\" for reading"
		unless (open (game, "<$_")) ;
	    die "Empty game file \"$_\""
		unless ($game = join ('', <game>)) ;
	    close (game) ;
	    &debug ("Read in game file \"$_\"\n") ;
	    ## Remove position diagram if it wasn't in the input msg
	    $game =~ s/($posdiag)// if ("$OUTPUT_POS" ne "y") ;
	    ($game_name, $game_num) = &get_game_name_and_number ($game) ;
	    $games[$game_num] = $game ;
	}
	&debug ("Read in games from output files\n") ;
    } else {
	&debug ("No games to read from STDIN\n") ;
	if (-f $outfile) {
	    @games = &get_games_from_file($outfile) ;
	} else {
	    die "Can't find any game files\n" unless (@results) ;
	}
    }

    ## ################################################################# ##
    ## Process games
    ## ################################################################# ##

    if (@games) {
	## ############################################################# ##
	## Find opponent's email address in games
	## ############################################################# ##
	
	$OPP_ADDRESS = &get_opp_address_from_games (@games)
	    unless ($OPP_ADDRESS) ;

	## ############################################################# ##
	## Collect the .game.out.* files into the .out file, remembering
	## the move number of the last line and whether result or not
	## ############################################################# ##

	$unfinished = 0 ;
	$move_num = 0 ;
	$move = blank ;

	## Write games to output file
	die "Can't open output file \"$PGN_GAME.out\" for writing\n"
	    unless open (outfile, ">$PGN_GAME.out") ;
	print outfile @games ;
	close (outfile) ;
		
	$game_num = -1 ;
	$num_games = 0 ;
	foreach $game (@games) {
	    $game_num ++ ;
	    next unless ($game) ;

	    $num_games ++ ;
	    ## Determine last move and whether result or not
	    $result = 0 ;
	    foreach (split(/\n/, $game)) {
		if (/^(.*[^\d]+|)(\d+)[.]+\s*[^\s.]*\s+(\S+)\s*$/) {
		    $move_num = $2 ;
		    $move    = $3 ;
		} elsif (/^\[Result\s*"(.*)"\]$/) {
		    if ($1 ne "*") {
			$result = 1 ;
			$finished ++ ;
		    } else {
			$unfinished ++ ;
		    }
		}
	    }
	    
	    $results[$game_num] = $game if ($result) ;
	}

	## Write result files back to $PGN_GAME.res
	if (@results) {
	    die "Can't open results file $PGN_GAME.res for writing\n"
		unless open (resfile, ">$PGN_GAME.res") ;
	    print resfile @results ;
	    close (results) ;
	}

	unlink <$PGN_GAME.game.out.*> ;

	## ############################################################# ##
	## Just say how many games are in the message
	## ############################################################# ##
	    
	if ($num_games > 1) {
	    $move_msg = "$num_games games" ;
	} else {
	    $move_msg = "1 game" ;
	}

	## ############################################################# ##
	## Print how many finished/unfinished games were found
	## ############################################################# ##

	printf ("Sending %d unfinished %s and %d finished %s.\n",
		$unfinished, ($unfinished == 1) ? "game" : "games",
		$finished, ($finished == 1) ? "game" : "games") ;

	## ############################################################# ##
	## Send the mail message to opponent's address unless bypassed
	## ############################################################# ##

	if ($SEND_MAIL) {
	    local ($subject) = "cmail $move_msg <$PGN_GAME>" ;
  	    if (open (mail, "|$MAILPROG -s \"$subject\" $OPP_ADDRESS")) {
		print mail @games ;
		close (mail) ;
		print (  "Mailed cmail message to \"$OPP_ADDRESS\":\n"
		       . "$move_msg <$PGN_GAME>\n") ;
		@ARCHIVE = @results unless ($unfinished) ;
	    } else {
		die "Failed to mail cmail message.\n" ;
	    }
	} else {
	    print (  "Email not sent (as requested).\n"
		   . "Would have mailed cmail message to \"$OPP_ADDRESS\":\n"
		   . "$NUM_GAMES games <$PGN_GAME>\n") ;
	}
    } else {
	if (@results) {
	    print "Email not sent (the game is over).\n" ;
	} else {
	    die "No games found\n" ;
	}
    }
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Get date from array of games
sub get_date_from_games {
    local (@games) = @_ ;

    local ($date) = "nodate" ;

    foreach (@games) {
	if (/\[Date\s"(.*)"\]/) {
	    $date = $1 ;
	    last ;		## Assume all dates are the same
	}
    }

    return ($date) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Determine which colour is to play and the move number
sub get_to_play {
    &debug ("Called <get_to_play>\n") ;
    local ($game) = shift ;

    local ($number, $to_play) = (1, "White") ;

    $game =~ s/{[^}]*}//g ;
    $game =~ s/[\s\n]*[*][\s\n]*$// ;

    if ($game =~ /(\d+)[.][ ]*([.]*)[ ]*([^\n.]*)[\n\s]*[10-]*[\n\s]*$/) {
	$number = $1 ;

	if ($game =~ /\[Result "0-1"\]/) {
	    $to_play = "Black" ;
	} elsif ($game =~ /\[Result "1-0"\]/) {
	    $to_play = "White" ;
	} elsif (($2 ne "") || (($3 =~ / /) || ($3 eq ""))) {
	    $to_play = "White" ;
	    $number ++ ;
	} else {
	    $to_play = "Black" ;
	}
    }

    &debug ("$to_play to play on move $number\n") ;

    return ($number, $to_play) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Get opp address from array of games
sub get_opp_address_from_games {
    &debug ("Called <get_opp_address_from_games>\n") ;
    local (@games) = @_ ;

    local ($opp_address) = "" ;
    local ($number, $to_play, $tag) ;

    foreach (@games) {
	next unless $_ ;
	
	($number, $to_play) = &get_to_play ($_) ;
	$tag = (  ($to_play eq "White")
		? "WhiteNA"
		: "BlackNA") ;

	if (/\[$tag\s"(.*)"\]/) {
	    $opp_address = $1 ;
	    die "cmail: Empty \"$tag\" tag\n" unless ($opp_address) ;
	    &debug ("Found opponent's address \"$opp_address\" from games.\n") ;
	    last ;		## Assume all opp addresses are the same
	} else {
	    die "cmail: Can't find \"$tag\" tag\n" ;
	}
    }

    die "cmail: Can't find opponent's email address\n" unless ($opp_address) ;

    return ($opp_address) ;
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Archive @ARCHIVE in the $ARCDIR directory
sub archive {
    return () unless (@ARCHIVE) ;

    local ($date) = &get_date_from_games (@ARCHIVE) ;

    local ($file) = "$ARCDIR/$PGN_GAME.$date.archive" ;
    if (open (archive, ">$file")) {
	print archive @ARCHIVE ;
	close (archive) ;
	print "Archived game in $file\n" ;
	local (@remove) = <$PGN_GAME*> ;
	@remove = grep ($_ ne "$PGN_GAME.$date.archive",
			@remove) ; ## Don't delete archive
	unlink (@remove) ;
    } else {
	print "Couldn't open \"$file\" to archive game\n" ;
    }
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#


#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
## Main body
sub main {
    local (@games) = () ;

    &initialise () ;		## Initialise variables etc.

    if (-t || $REMAIL) { ## No input directed (invoked from a shell rather than a mailer)
	&debug ("Interactive!\n") ;
	&find_game () ;		## Get the necessary info about the game
    } else {
	&debug ("Piping!\n") ;
	&analyse_email_message () ; ## Analyse the mail message
    }
    
    if (! &play_game ()) {	## Load the game
	&send_move () ;		## Analyse output and send moves
    }

    &archive () ;		## Archive games if all finished

    close (tty) ;		## Tidy up
    close (logfile) if ($DEBUG) ; ## Tidy up
}
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
&main () ;
#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
__END__
cmail $Revision: 3.8 $, Copyright (C) 1993 Free Software Foundation, Inc.
cmail comes with ABSOLUTELY NO WARRANTY; for details type `cmail -w'.
cmail is free software, and you are welcome to redistribute it
under certain conditions; type `cmail -c' for details.

{END OF GPL COPYRIGHT}
		    GNU GENERAL PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
under the terms of this General Public License.  The "Program", below,
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that is to say, a work containing the Program or a portion of it,
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  2. You may modify your copy or copies of the Program or any portion
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  3. You may copy and distribute the Program (or a work based on it,
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  4. You may not copy, modify, sublicense, or distribute the Program
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  6. Each time you redistribute the Program (or any work based on the
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  8. If the distribution and/or use of the Program is restricted in
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  9. The Free Software Foundation may publish revised and/or new versions
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Each version is given a distinguishing version number.  If the Program
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  10. If you wish to incorporate parts of the Program into other free
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{END OF GPL CONDITIONS}
		    GNU GENERAL PUBLIC LICENSE
			    NO WARRANTY

  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
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TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
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  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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