From e29c53208a1dc3a737f75e8bb771c688ef8f49a4 Mon Sep 17 00:00:00 2001
From: David Vazgenovich Shakaryan <dvshakaryan@gmail.com>
Date: Fri, 31 Mar 2023 21:12:29 -0700
Subject: consistent weekly schedule with configurable start day

---
 backomp | 31 +++++++++++++++++++++++--------
 1 file changed, 23 insertions(+), 8 deletions(-)

diff --git a/backomp b/backomp
index 460584c..068dade 100755
--- a/backomp
+++ b/backomp
@@ -12,13 +12,18 @@ BEGIN {
 	for (i = 1; i <= len; ++i) {
 		b = arr[i]
 
-		if (!match(retain, "([*0-9]+)" b, md))
+		if (!match(opt_retain, "([*0-9]+)" b, md))
 			continue
 		ret[b] = md[1]
 		buckets[++n_buckets] = b
 
-		repl[b] = !!index(replace, b)
+		newest_in[b] = !!index(opt_newest_in, b)
 	}
+
+	split("sun mon tue wed thu fri sat", arr)
+	for (i in arr)
+		arr2[arr[i]] = i - 1
+	wshift = (11 - arr2[opt_week_start])*24*60*60
 }
 
 {
@@ -27,13 +32,16 @@ BEGIN {
 
 	bt["h"] = flr(t, 60*60)
 	bt["d"] = flr(t, 24*60*60)
+	bt["w"] = flr(t + wshift, 7*24*60*60) - wshift
 	bt["m"] = mktime(strftime("%Y %m", t, 1) " 01 00 00 00", 1)
-	bt["w"] = bt["m"] + flr(t - bt["m"], 7*24*60*60)
 
 	for (i = 1; i <= n_buckets; ++i) {
 		b = buckets[i]
 
-		if (repl[b] && bt[b] == last[b, b]) {
+		if (b == "m" && !newest_in["w"] && bt["m"] > bt["w"])
+			next
+
+		if (newest_in[b] && bt[b] == last[b, b]) {
 			for (j = 1; j < i; ++j) {
 				if (bt[buckets[j]] == last[b, buckets[j]])
 					break
@@ -69,7 +77,8 @@ backup() {
 	dest_dir="${1}"
 	src_path="${2}"
 	retain="${3}"
-	replace="${4}"
+	newest_in="${4}"
+	week_start="${5}"
 
 	[[ "$((dcount++))" -ne 0 ]] && echo
 	echo "[${dcount}] [${retain}] ${src_path} => ${dest_dir}"
@@ -82,7 +91,10 @@ backup() {
 	snaps=("${dest_path}" "${snaps[@]}")
 
 	mapfile -t keep < <(
-		awk -v "retain=${retain}" -v "replace=${replace}" \
+		awk \
+			-v "opt_retain=${retain}" \
+			-v "opt_newest_in=${newest_in}" \
+			-v "opt_week_start=${week_start}" \
 			"${FILTER_AWK}" < <(printf '%s\n' "${snaps[@]}"))
 	if [[ -z "${keep}" ]]; then
 		echo "WARNING: dirs to keep shouldn't be empty; skipping" >&2
@@ -102,7 +114,8 @@ backup() {
 
 declare -A def_opts=(
 	['retain']='*h*d*w*m'
-	['replace']='h'
+	['newest_in']='h'
+	['week_start']='sun'
 )
 declare -A opts
 
@@ -118,6 +131,8 @@ while IFS='=' read -r f1 f2; do
 			opts["${opt}"]="${f2:-"${def_opts["${opt}"]}"}"
 	else
 		backup "${base_path}/${f1}" "${f2}" \
-			"${opts['retain']}" "${opts['replace']}"
+			"${opts['retain']}" \
+			"${opts['newest_in']}" \
+			"${opts['week_start']}"
 	fi
 done < "${1}"
-- 
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