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reldate: accept day-of-week

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Matthew Ryan Dillon 2025-12-17 17:30:34 -05:00
parent e6f2e031db
commit 6e5ac0799b
1 changed files with 72 additions and 6 deletions
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78
home/bin/executable_reldate
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@ -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