#!/bin/sh

# list files last modified in a given month & year.

# License: LGPLv2
# Author:
#    http://www.pixelbeat.org/
# Changes:
#    V0.1, 08 Jul 2004, Initial release
#    V0.2, 04 Oct 2007, Fix reporting for files close to month boundaries
#                       Fix reporting for current month
#                       Support reporting of future dates
#                       Better error checking

if test "$Argc" -lt 2 {
    echo "Usage: $[basename $0] MM YYYY [other find parameters]" >&2
    exit 1
}

set -e #exit early on error

setglobal month = $1
setglobal year = $2
shift; shift

if test $month = "12" {
    setglobal next_year = $[expr $year + 1]
    setglobal next_year = $[printf "%02d" $next_year] #date requires YY not Y
    setglobal next_month = '1'
} else {
    setglobal next_year = $year
    setglobal next_month = $[expr $month + 1]
}
setglobal now = $[date --utc +%s]
setglobal start = $[date --date="$year-$month-01 UTC" +%s]
setglobal end = $[date --date="$next_year-$next_month-01 UTC" +%s]

if test $start -gt $now {
    setglobal start = $now
    setglobal end = ''""
} elif test $end -gt $now {
    setglobal end = ''""
}

setglobal start_days_ago = $[expr '(' $now - $start ')' / 86400]
setglobal start_days_ago = $[expr $start_days_ago + 1]
if test $end { #faster
    setglobal end_days_ago = $[expr '(' $now - $end ')' / 86400]
    find @ARGV -daystart -mtime -$start_days_ago -mtime +$end_days_ago
} else {
    test $[echo -n $month | wc -c] -eq 1 && setglobal month = ""0$month""
    test $[echo -n $year | wc -c] -eq 2 && setglobal year = ""20$year""
    find @ARGV -daystart -mtime -$start_days_ago -printf "%p\0%Tm-%TY\n" |
    env LANG=C grep -a "$month-$year$" |
    cut -d '' -f1
}