note

#!/bin/bash

# Append a timestamped note to ~/notes.md
# Usage: note "your thought here"
#        note                      (opens notes in $EDITOR)
#        note --list / -l [N]      (print last N notes, default 10)

NOTES_FILE="${NOTES_FILE:-$HOME/notes.md}"

if [ ! -f "$NOTES_FILE" ]; then
  echo "# Notes" > "$NOTES_FILE"
  echo "" >> "$NOTES_FILE"
fi

if [ $# -eq 0 ]; then
  # Unquoted so values like EDITOR="code --wait" still work.
  ${EDITOR:-vim} "$NOTES_FILE"
  exit 0
fi

if [ "$1" = "--list" ] || [ "$1" = "-l" ]; then
  count="${2:-10}"
  if ! [[ "$count" =~ ^[0-9]+$ ]] || [ "$count" -eq 0 ]; then
    echo "Error: note -l expects a positive number."
    exit 1
  fi
  echo "Last $count notes:"
  echo "---"
  grep "^- " "$NOTES_FILE" | tail -n "$count"
  exit 0
fi

timestamp=$(date "+%Y-%m-%d %H:%M")
entry="- [$timestamp] $*"

echo "$entry" >> "$NOTES_FILE"
echo "Noted: $*"