#!/bin/sh
# -------------------------  *-*-tcl-*-*  -------------------------
# BLACK MAGIC to restart with ical (keep the backslash!)	\
exec /dfs/dept/trg/sb/mic/install/bin/ical -f "$0" -nodisplay

# -----------------------------------------------------------------
# ID: $Id: ical2html,v 1.1 1997/09/08 18:46:59 sanjay Exp $
#
# showcal -- 
#    CGI script to list appointments stored in an ical
#    calendar file. The following CGI parameters are 
#    recognized:
#		days : the number of days to show
#		user : the account name of the user
#		file : the calendar file to use (XXX currently disabled
#		       for security)
#
# Jul  9 1997 -- Created by Mic Bowman (mic+@transarc.com)
#
# EXPORTED FUNCTIONS --
#     NONE
# -----------------------------------------------------------------

# -----------------------------------------------------------------
# HISTORY
# $TALog: ical2html,v $
# Revision 1.1  1997/07/09  18:47:23  mic
# Initial revision
#
# -----------------------------------------------------------------

# Default path to user's calendar
set defaultpath {/dfs/home/$user/.calendar}

# Colors for display
set bgcolor(appt)  {"#c0d9d9"}
set bgcolor(note)  {"#eaadea"}
set bgcolor(day)   {"#e9c2a6"}
set bgcolor(month) {navy}

# Set-up arrays for pretty-printing dates
set wday(1)	Sunday
set wday(2)	Monday
set wday(3)	Tuesday
set wday(4)	Wednesday
set wday(5)	Thursday
set wday(6)	Friday
set wday(7)	Saturday

set mon(1)	January
set mon(2)	February
set mon(3)	March
set mon(4)	April
set mon(5)	May
set mon(6)	June
set mon(7)	July
set mon(8)	August
set mon(9)	September
set mon(10)	October
set mon(11)	November
set mon(12)	December

# -----------------------------------------------------------------
# Procedure: HTTPHeader
#	Send HTTP header information
# Parameters:
#	none
# Returns:
#	none
# -----------------------------------------------------------------
proc HTTPHeader {} {
    puts "Content-type: text/html"
    puts ""
}

# -----------------------------------------------------------------
# Procedure: StartDocument
#	Display material that appears before the calendar table.
# Parameters:
#	days
# Returns:
#	none
# -----------------------------------------------------------------
proc StartDocument {user days} {
    global env

    set acctname $user
    set realname $user
    catch {
	set realname [exec grep ^$acctname: /etc/passwd | awk -F: {{print $5}}]
    }

    puts "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML//EN\">"
    puts "<html><head><title>$days Day Calendar for $realname</title></head>"
    puts "<body TEXT=black LINK=navy VLINK=\"#215e21\">"
    puts "<center><font size=+6>$days Day Calendar for $realname</font></center>"
    puts "<P><P>"
}

# -----------------------------------------------------------------
# Procedure: ShowCalendar
#	Display the table of appointments from the ical calendar.
# Parameters:
#       file -- calendar file
#	days -- number of days to show
# Returns:
#	none
# -----------------------------------------------------------------
proc ShowCalendar {file days} {
    global bgcolor wday mon ical

    set monthday -1
    set month -1
    set maccum {}
    set daccum {}

    puts "<center>\n<table border=3 bgcolor=$bgcolor(day)>"


    # Generate listing
    calendar cal $file

    cal listing [date today] [expr [date today]+$days-1] i d {
	if {[date monthday $d] != $monthday} {
	    set dlen [llength $daccum]
	    if {$dlen > 0} {
		set ditem1 "<td valign=top rowspan=$dlen>$monthday</td>"
		set ditem2 "<td valign=top rowspan=$dlen>$weekday</td>"
		set first 1
		foreach itext $daccum {
		    if {$first} {
			lappend maccum "$ditem1 $ditem2 $itext"
			set first 0
		    } else {
			lappend maccum $itext
		    }
		}
	    }

	    set daccum {}
	    set monthday [date monthday $d]
	    set weekday $wday([date weekday $d])
	}

	if {[date month $d] != $month} {
	    if {[llength $maccum] > 0} {
		puts "<tr><td colspan=4 align=center bgcolor=$bgcolor(month)>"
		puts "<font size=+4 color=white>$mon($month)</font>"
		puts "</td></tr>"

		foreach itext $maccum {
		    puts "<tr>$itext</tr>"
		}
	    }

	    set maccum {}
	    set month [date month $d]
	}

	set spantime "<font color=$bgcolor(note)>*</font>"
	set itemcolor "bgcolor=$bgcolor(note)"
	set itemtext [$i text]
	if {[$i is appt]} {
	    set itemcolor "bgcolor=$bgcolor(appt)"
	    set stime [$i starttime]
	    set etime [expr $stime + [$i length]]
	    set spantime [format "%02d:%02d to %02d:%02d"	\
		    [expr $stime/60] [expr $stime%60]		\
		    [expr $etime/60] [expr $etime%60]]
	}

	set text "<td $itemcolor>$spantime</td><td $itemcolor>$itemtext</td>"
	lappend daccum $text
    }

    # Clean out daily accumulator
    set dlen [llength $daccum]
    if {$dlen > 0} {
	set ditem1 "<td valign=top rowspan=$dlen>$monthday</td>"
	set ditem2 "<td valign=top rowspan=$dlen>$weekday</td>"
	set first 1
	foreach itext $daccum {
	    if {$first} {
		lappend maccum "$ditem1 $ditem2 $itext"
		set first 0
	    } else {
		lappend maccum $itext
	    }
	}
    }

    # Clean out monthly accumulator
    if {[llength $maccum] > 0} {
	puts "<tr><td colspan=4 align=center bgcolor=navy>"
	puts "<font size=+3 color=white>$mon($month)</font>"
	puts "</td></tr>"

	foreach itext $maccum {
	    puts "<tr>$itext</tr>"
	}
    }

    puts "</table></center>"
}

# -----------------------------------------------------------------
# Procedure: EndDocument
#	Display material that appears after the calendar display.
# Parameters:
#	none
# Returns:
#	none
# -----------------------------------------------------------------
proc EndDocument {} {
    puts "</body></html>"
}


# -----------------------------------------------------------------
# Procedure: HexToChar
#	Convert hex string to a character
# Parameters:
#	hex string
# Returns:
#	char
# -----------------------------------------------------------------
proc HexToChar {hex} {
    scan $hex "%x" val
    return [format "%c" $val]
}

# -----------------------------------------------------------------
# Procedure: CGIParse
#	
# Parameters:
#	
# Returns:
#	
# -----------------------------------------------------------------
proc CGIParse {Cgiparms} {
    upvar $Cgiparms cgiparms
    global env
    
    # Get the encode query string
    if {$env(REQUEST_METHOD) == "GET"} {
	set instring $env(QUERY_STRING)
    } else {
	set instring [read stdin $env(CONTENT_LENGTH)]
    }

    foreach parm [split $instring &] {
	# Convert plus's to spaces
	regsub -all {\+} $parm { } parm

	# Convert %XX form to alphanumeric
	regsub -all {\[} $parm {\[} parm
	regsub -all {%([a-eA-E0-9][a-eA-E0-9])} $parm {[HexToChar \1]} parm
	set parm [subst -novariables $parm]

	# Break into key and value
	set eqind [string first = $parm]
	if {$eqind <= 0} {
	    puts stderr "Invalid query encoding"
	    exit 1
	}

	set key [string range $parm 0 [expr $eqind - 1]]
	set val [string range $parm [expr $eqind + 1] end]
	set cgiparms($key) $val
    }
}

# -----------------------------------------------------------------
# Main
# -----------------------------------------------------------------

# ---------- Process the query string ----------
CGIParse cgiparms

# ---------- Get the user's identity ----------
if {[array names cgiparms user] != ""} {
    set user $cgiparms(user)
} elseif {[array names env REMOTE_USER] != ""} {
    set user $env(REMOTE_USER)
} else {
    set user unknown
}

# ---------- Get the calendar file ----------
set file [subst -nobackslashes -nocommands $defaultpath]
if 0 {
    # XXX Disabled for security reasons
    if {[array names cgiparms file] != ""} {
	set file $cgiparms(file)
    }
}

if {! [file exists $file]} {
    puts "Unable to locate calendar file"
    exit 1
}

# ---------- Get the span of days ----------
set days 10
if {[array names cgiparms days] != ""} {
    set days $cgiparms(days)
}

# ---------- Create the calendar display ----------
HTTPHeader
StartDocument $user $days
ShowCalendar $file $days
EndDocument

# Finish up
exit 0

