"OCR" letter recognition for Advent of Code puzzles, compatible with all puzzles from 2015 to 2019. Also comes with a handy command line utility to parse the ASCII art directly from stdin:

$ cat abc.txt .##..###...##. #..#.#..#.#..# #..#.###..#... ####.#..#.#... #..#.#..#.#..# #..#.###...##. $ cat abc.txt | advent-of-code-ocr ABC 

To use as a library, add advent-of-code-ocr as a hackage dependency like you would any other.

To use as an executable:

# using stack stack install advent-of-code-ocr # using cabal cabal install advent-of-code-ocr # from source git clone https://github.com/mstksg/advent-of-code-ocr cd advent-of-code-ocr cabal install # or stack install

Should be compatible with all challenges from 2015 to 2021. However, I have only tested it with:

• 2016 Day 8
• 2018 Day 10
• 2019 Day 8
• 2019 Day 11
• 2021 Day 13 (thanks @uvg)
• 2022 Day 10 (thanks @uvg)

And it is possible I have missed some. If you notice any I am missing, please let me know!

Much of the content for the letterforms was gathered on freenode ##adventofcode and solutions threads on reddit; the large font for the most part has been gathered by u/usbpc102 on reddit. O and I letterforms for the small font contributed by u/TheShallowOne on reddit for version 1.1.10, and the S small font letterform contributed by @gilgamec.