#!/bin/sh

# Shows the date for "fri week" or "mon last" for e.g.

# License: LGPLv2

proc Usage {
    echo "Usage: $[basename $0] mon|tue|... [next]|week|last" > !2
    exit 1
}

test "$Argc" -eq "0" && Usage

setglobal day = $1
setglobal which = $2
test -z $which && setglobal which = 'next'

match $which {
with week
    if test $[date +%D] = $[date --date="next $day" +%D] {
        setglobal weeks = '+2' #assume we want the next week, not today
    } else {
        setglobal weeks = '+1'
    } 
with last
    setglobal weeks = '-1'
with next
    if test $[date +%D] = $[date --date="next $day" +%D] {
        setglobal weeks = '+1' #assume we want the next week, not today
    } else {
        setglobal weeks = '+0'
    } 
with *
    Usage
}

date --date="$day $weeks weeks" +%x