#!/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

setvar month = "$1"
setvar year = "$2"
shift; shift

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

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

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