Currently this just contains a Python script to generate the Prolog code needed to solve the Day 7 challenge. To use it, store the day 7 challenge input in some text file (my input is included as input7.txt to serve as an example). Then run the script to generate a Prolog input file. The output just goes to standard out, so redirect to store it.
python3 day7.py input7.txt > day7.pl
Next start up SWI Prolog (available via apt, brew, etc.).
swipl
At the Prolog prompt, first load the file.
[day7].
The system should respond with true. Next execute the query for Part 1.
findall(X,transitive_in(X,shiny_gold),Solutions), length(Solutions, Len).
The system should respond with the following.
Solutions = [shiny_lavender, posh_red, mirrored_salmon, shiny_yellow, dotted_white, plaid_yellow, bright_fuchsia, posh_salmon, dotted_yellow|...],
Len = 177.
The answer is 177. Next solve Part 2.
size([shiny_gold],Z).
The system responds with "Z = 34988". The answer is 34988.