If you have brew Installed, you can install enscript and create a little batch file to do the conversion for you. From Terminal:
brew install enscript
After the magic, create a batch file
#!/bin/bash
enscript - -word-wrap -p - "$1" | pstopdf -i -o "$2"
Oh, meant to mention, those two dashes before word-wrap should be together, Discourse makes two dashes into an em dash —, so I added a space.
And save it to /usr/local/bin/txt2pdf
Then chmod +x /usr/local/bin/txt2pdf
Now you can just:
txt2pdf myfile.txt myfile.pdf