From 0b8066923b718b6ace351846290a176b5b308ed7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=84min=20Baumeler?= <amin@indyfac.ch>
Date: Sun, 15 Jun 2025 21:07:15 +0200
Subject: [PATCH] improvement: Calendar preview: weeks start on Mondays

---
 src/awk/{cal.awk => calannot.awk} |  0
 src/awk/calshift.awk              | 19 +++++++++++++++++++
 src/main.sh                       | 30 +++++++++++++++++++-----------
 3 files changed, 38 insertions(+), 11 deletions(-)
 rename src/awk/{cal.awk => calannot.awk} (100%)
 create mode 100644 src/awk/calshift.awk

diff --git a/src/awk/cal.awk b/src/awk/calannot.awk
similarity index 100%
rename from src/awk/cal.awk
rename to src/awk/calannot.awk
diff --git a/src/awk/calshift.awk b/src/awk/calshift.awk
new file mode 100644
index 0000000..a945404
--- /dev/null
+++ b/src/awk/calshift.awk
@@ -0,0 +1,19 @@
+BEGIN { 
+  ORS = ""
+  W3 = "   "
+  W17 = W3 W3 W3 W3 W3 "  "
+}
+NR == 1 { i++; print $0 "\n"; next }
+NR == 2 { i++; print substr($0, 4, 17) " " substr($0, 1, 3) " \n"; next }
+NR == 3 && /^ 1/ { print W17; }
+NR == 3 && /^  / { print substr($0, 4, 17); next }
+/[0-9]/ {
+  i++
+  print " " substr($0, 1, 3) " \n" substr($0, 4, 17)
+}
+END { 
+  i++
+  print " " W3 " \n"
+  for (i; i<8; i++)
+    print " " W17 W3 " \n"
+}
diff --git a/src/main.sh b/src/main.sh
index e330e84..9095664 100755
--- a/src/main.sh
+++ b/src/main.sh
@@ -137,7 +137,8 @@ fi
 # Print preview of week.
 #
 # @input $2: Line from week view
-# @req $AWK_CAL: Awk script to annotate calendar
+# @req $AWK_CALSHIFT: Awk script to make `cal` output to start on Mondays
+# @req $AWK_CALANNOT: Awk script to annotate calendar
 if [ "${1:-}" = "--preview-week" ]; then
   sign=$(echo "$2" | cut -d '|' -f 1)
   if [ "$sign" = "+" ]; then
@@ -188,12 +189,12 @@ if [ "${1:-}" = "--preview-week" ]; then
     fi
     # show
     (
-      cal "$month_pre2" "$year_pre2" | awk -v cur="${var_pre2:-}" "$AWK_CAL"
-      cal "$month_pre" "$year_pre" | awk -v cur="${var_pre:-}" "$AWK_CAL"
-      cal "$month" "$year" | awk -v cur="${var:-}" -v day="$day" "$AWK_CAL"
-      cal "$month_nex" "$year_nex" | awk -v cur="${var_nex:-}" "$AWK_CAL"
-      cal "$month_nex2" "$year_nex2" | awk -v cur="${var_nex2:-}" "$AWK_CAL"
-      cal "$month_nex3" "$year_nex3" | awk -v cur="${var_nex3:-}" "$AWK_CAL"
+      cal "$month_pre2" "$year_pre2" | awk "$AWK_CALSHIFT" | awk -v cur="${var_pre2:-}" "$AWK_CALANNOT"
+      cal "$month_pre" "$year_pre" | awk "$AWK_CALSHIFT" | awk -v cur="${var_pre:-}" "$AWK_CALANNOT"
+      cal "$month" "$year" | awk "$AWK_CALSHIFT" | awk -v cur="${var:-}" -v day="$day" "$AWK_CALANNOT"
+      cal "$month_nex" "$year_nex" | awk "$AWK_CALSHIFT" | awk -v cur="${var_nex:-}" "$AWK_CALANNOT"
+      cal "$month_nex2" "$year_nex2" | awk "$AWK_CALSHIFT" | awk -v cur="${var_nex2:-}" "$AWK_CALANNOT"
+      cal "$month_nex3" "$year_nex3" | awk "$AWK_CALSHIFT" | awk -v cur="${var_nex3:-}" "$AWK_CALANNOT"
     ) | awk '{ l[NR%8] = l[NR%8] "    " $0 } END {for (i in l) if (i>0) print l[i] }'
   fi
   exit
@@ -448,7 +449,8 @@ fi
 ###
 ### AWK scripts
 ###   AWK_APPROX:   Generate approximate data of all files
-###   AWK_CAL:      Annotate output of `cal`
+###   AWK_CALSHIFT: Shift calendar to start weeks on Mondays
+###   AWK_CALANNOT: Annotate calendar
 ###   AWK_DAYVIEW:  Generate view of the day
 ###   AWK_GET:      Print field of iCalendar file
 ###   AWK_MERGE:    Generate list of weeks with associated iCalendar files
@@ -507,9 +509,15 @@ AWK_NEW=$(
 EOF
 )
 
-AWK_CAL=$(
+AWK_CALSHIFT=$(
   cat <<'EOF'
-@@include src/awk/cal.awk
+@@include src/awk/calshift.awk
+EOF
+)
+
+AWK_CALANNOT=$(
+  cat <<'EOF'
+@@include src/awk/calannot.awk
 EOF
 )
 
@@ -882,7 +890,7 @@ __refresh_data
 
 ### Exports
 # The preview calls run in subprocesses. These require the following variables:
-export ROOT CAT AWK_GET AWK_CAL CYAN WHITE ITALIC OFF
+export ROOT CAT AWK_GET AWK_CALSHIFT AWK_CALANNOT CYAN WHITE ITALIC OFF
 # The reload commands also run in subprocesses, and use in addition
 export COLLECTION_LABELS DAY_START DAY_END AWK_DAYVIEW AWK_WEEKVIEW AWK_PARSE
 # as well as the following variables that will be dynamically specified. So, we