#!/bin/csh -f
#+
# nightpath -- return the path of the 'nightly' directory
#
# Purpose:
#	Print a string containing the predicted name of the 'nightly'
#	directory into which cam images and other nightly data are placed.
#	This directory is predicted based on the instrument in use and can
#	be overridden by use of the "side" parameter.
#
# Usage:
#	nightpath [side] [net]
# 
# Arguments:
#	side = [1|2] Telescope side in use (1=Keck I, 2=Keck II)
#	net  = [h|s] Network (h = HQ, s = summit)
# 
# Output:
#	String is printed to stdout
# 
# Restrictions:
#	None
# 
# Exit values:
#	0 = normal completion
#	1 = wrong number of arguments
#
# Example:
#	1) Generate the summit nightly directory path for the current 
#	instrument:
#		nightpath
# 
#	2) Generate the HQ nightly directory path for Keck II:
#		nightpath 2 h
#
#	3) Generate an alias to switch to the appropriate directory:
#		alias cdn	'chdir `nightpath \!*` ; pwd'
# 
#-
# Modification history:
#	2001-Jun-27	GDW	Original version
#	2001-Feb-20	RWG	Added "net" argument
#	2001-Feb-23	GDW	Added "k1" and "k2" options
#				Made default option k1
#-----------------------------------------------------------------------

# define initial values...
set buf = $0
set cmd = $buf:t
set usage = "Usage: $cmd [1|2] [h|s]"
set side = 1
set net = "s"

# define side based on instrument...
if ( $?INSTRUMENT ) then
	switch ( $INSTRUMENT)
		case esi:
                case nirc2:
		case nirspec:
		case deimos:
                case k2:
			set side = 2
			breaksw
		case lris:
		case hires:
		case nirc:
		case lws:
                case k1:
                default:
			set side = 1
			breaksw
	endsw
endif

# Parse arguments.
while ($#argv > 0)
    switch ($1)
    case "1":
    case "2":
        set side = $1
        breaksw

    case "h":
    case "s":
        set net = "$1"
        breaksw

    default:
        cat <<HUH

Did not understand the argument "$1".

$usage

HUH
        exit 1

    endsw
    shift
end

# define the directory head based on the side...
set head = /$net/nightly$side

# generate the directory tail based on the date...
date -u "+$head/%y/%m/%d/"