From 1bd8ce37446e87f840e709cf870227aafcd17a7e Mon Sep 17 00:00:00 2001
From: PowerUser64 <blake@blakenorth.net>
Date: Fri, 7 Apr 2023 03:03:47 -0700
Subject: [PATCH] sleep-until: better errors, add DRY mode for dry run

---
 .config/shell/bin/sleep-until | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/.config/shell/bin/sleep-until b/.config/shell/bin/sleep-until
index 83cfb42..68e65d3 100755
--- a/.config/shell/bin/sleep-until
+++ b/.config/shell/bin/sleep-until
@@ -2,16 +2,23 @@
 # Usage: sleep-until <time>
 # Ex: sleep-until 3:00 pm
 
+DRY="${DRY:-false}"
+
 if [ -n "$1" ] && date --date="$*" > /dev/null 2>&1; then
+   # Calculate the time in seconds to sleep by subtracting the future time from the current time
    SLEEP_TIME="$(( $(date -f - +%s- <<< "$*"$'\nnow') 0 ))"
    if [ "$SLEEP_TIME" -gt 0 ]; then
       echo "Sleeping until:  $(date --date="$*")  (${SLEEP_TIME}s)"
-      sleep "$SLEEP_TIME"
+      if ! "$DRY"; then
+         sleep "$SLEEP_TIME"
+      fi
    else
-      echo "Sadly, you cannot sleep to a time in the past"
+      echo "Error: input date '$*' is in the past" >&2
+      echo "Sadly, you cannot sleep to a time in the past" >&2
       exit 1
    fi
 else
-   echo "Please input a valid date"
+   echo "Error: input date '$*' is invalid" >&2
+   echo "Please input a valid date" >&2
    exit 1
 fi