nano-ordinals

Tiny ordinal ↔ cardinal converter — ~1 KB, zero deps. 1 → 1st, 2 → 2nd, 11 → 11th, -3 → -3rd … and back. Perfect for code-golf, minimal containers, or just for fun.

✨ Features

• ✅ Cardinal → ordinal (English suffix rules incl. 11/12/13 → th)
• ✅ Ordinal → cardinal (case-insensitive: 21st, 101ST, 42nd)
• ✅ Negative numbers supported (-3 → -3rd)
• ✅ Zero dependencies, single tiny file; CLI included

🚀 Usage

# Local (from repo)
python app_min.py 1      # 1st
python app_min.py 11     # 11th
python app_min.py -3     # -3rd
python app_min.py 21st   # 21

After installing:

# CLI
pip install nano-ordinals
nano-ordinals 42      # -> 42nd
nano-ordinals 101     # -> 101st
nano-ordinals 101st   # -> 101

🤓 Why so small?

• Minimal suffix rule: th unless endswith 1/2/3 and not 11/12/13
• Tiny regex: ([+-]?\d+)(st|nd|rd|th)?
• Single tiny file + tiny CLI: perfect for scripts, containers, CI.

🎉 Fun Ideas

• Generate a calendar day label

date +%d | sed 's/^0//' | xargs nano-ordinals       # 1 -> 1st, 21 -> 21st

(Get-Date).Day | % { nano-ordinals $_ }              # 14 -> 14th

• Ordinal list (1..20)

seq 1 20 | xargs -I{} nano-ordinals {}

1..20 | % { nano-ordinals $_ }

• Rankings / leaderboards

for n in 1 2 3 4; do echo "Player $n: $(nano-ordinals $n) place"; done
# Player 1: 1st place, Player 2: 2nd place, ...

• Git commit count → ordinal

nano-ordinals $(git rev-list --count HEAD)
# e.g., 42 -> 42nd commit

• Rename files with ordinal indices

i=1; for f in *.png; do mv "$f" "$(nano-ordinals $i)-$f"; i=$((i+1)); done
# 1st-image.png, 2nd-image.png, ...

• Sort plain ordinal tokens numerically

# lines like: 1st, 21st, 3rd...
awk '{print $0 "|" system("nano-ordinals "$0)}' ordinals.txt >/dev/null   # sanity check
paste <(cat ordinals.txt) <(sed 's/$//' ordinals.txt | xargs -n1 nano-ordinals) \
  | sort -k2,2n | cut -f1

• Reverse conversion (ordinal → number)

for x in 21st 101st 42nd; do echo "$x -> $(nano-ordinals $x)"; done
# 21st -> 21, 101st -> 101, 42nd -> 42

**Tip: Input that contains letters is treated as ordinal → cardinal; digits-only is cardinal → ordinal.

📜 License

MIT © 2025