From 6e5ac0799b68a8be1898d355990c4743807071a5 Mon Sep 17 00:00:00 2001
From: Matthew Ryan Dillon <matthew@akdillon.net>
Date: Wed, 17 Dec 2025 17:30:34 -0500
Subject: [PATCH] reldate: accept day-of-week

---
 home/bin/executable_reldate | 78 ++++++++++++++++++++++++++++++++++---
 1 file changed, 72 insertions(+), 6 deletions(-)

diff --git a/home/bin/executable_reldate b/home/bin/executable_reldate
index 1607c22..f57e74e 100644
--- a/home/bin/executable_reldate
+++ b/home/bin/executable_reldate
@@ -4,7 +4,7 @@ if [[ -z "$1" ]]; then
     cat << EOF
 reldate - Format or adjust dates
 
-Usage: reldate <date|adjustment>
+Usage: reldate <date|adjustment|keyword>
 
 Examples:
   reldate "2025-12-12"    # Output: 2025-12-12
@@ -13,16 +13,82 @@ Examples:
   reldate "+2m"           # Output: date 2 months from now
   reldate "-1y"           # Output: date 1 year ago
 
+  reldate today           # Output: today's date
+  reldate tomorrow        # Output: tomorrow's date
+  reldate yesterday       # Output: yesterday's date
+
+  reldate friday          # Output: next Friday
+  reldate fri             # Output: next Friday
+  reldate weekend         # Output: next Saturday
+
 Adjustments:
   d = days, w = weeks, m = months, y = years
   Use + for future, - for past
 
+Keywords:
+  today, tomorrow, yesterday
+  monday-sunday (or mon-sun)
+  weekend (Saturday)
+
 EOF
     exit 1
 fi
 
-if [[ "$1" =~ ^[0-9]{4}-[0-9]{2}-[0-9]{2}$ ]]; then
-    date -j -f "%Y-%m-%d" "$1" "+%Y-%m-%d" 2>/dev/null || echo "Invalid date: $1"
-else
-    date -v "$1" "+%Y-%m-%d"
-fi
+# Normalize input to lowercase
+input=$(echo "$1" | tr '[:upper:]' '[:lower:]')
+
+# Calculate days until a target weekday (1=Mon, 7=Sun)
+# Returns days to add (1-7, never 0 - same day means next week)
+days_until_weekday() {
+    local target=$1
+    local current=$(date +%u)
+    local diff=$(( (target - current + 7) % 7 ))
+    if [[ $diff -eq 0 ]]; then
+        diff=7
+    fi
+    echo $diff
+}
+
+# Map day name to number (1=Mon, 7=Sun)
+day_to_number() {
+    case "$1" in
+        mon|monday)    echo 1 ;;
+        tue|tuesday)   echo 2 ;;
+        wed|wednesday) echo 3 ;;
+        thu|thursday)  echo 4 ;;
+        fri|friday)    echo 5 ;;
+        sat|saturday)  echo 6 ;;
+        sun|sunday)    echo 7 ;;
+        *)             echo 0 ;;
+    esac
+}
+
+# Handle natural language keywords
+case "$input" in
+    today)
+        date "+%Y-%m-%d"
+        ;;
+    tomorrow)
+        date -v "+1d" "+%Y-%m-%d"
+        ;;
+    yesterday)
+        date -v "-1d" "+%Y-%m-%d"
+        ;;
+    weekend)
+        days=$(days_until_weekday 6)
+        date -v "+${days}d" "+%Y-%m-%d"
+        ;;
+    mon|monday|tue|tuesday|wed|wednesday|thu|thursday|fri|friday|sat|saturday|sun|sunday)
+        day_num=$(day_to_number "$input")
+        days=$(days_until_weekday "$day_num")
+        date -v "+${days}d" "+%Y-%m-%d"
+        ;;
+    *)
+        # Fall through to original logic
+        if [[ "$1" =~ ^[0-9]{4}-[0-9]{2}-[0-9]{2}$ ]]; then
+            date -j -f "%Y-%m-%d" "$1" "+%Y-%m-%d" 2>/dev/null || echo "Invalid date: $1"
+        else
+            date -v "$1" "+%Y-%m-%d"
+        fi
+        ;;
+esac