A one liner, no programming. (except the regexp etc.)

csplit --digits=2  --quiet --prefix=outfile infile "/-|/+1" "{*}"

tested on:csplit (GNU coreutils) 8.30

Notes about usage on Apple Mac

"For OS X users, note that the version of csplit that comes with the OS doesn't work. You'll want the version in coreutils (installable via Homebrew), which is called gcsplit." — @Danial

"Just to add, you can get the version for OS X to work (at least with High Sierra). You just need to tweak the args a bit csplit -k -f=outfile infile "/-\|/+1" "{3}". Features that don't seem to work are the "{*}", I had to be specific on the number of separators, and needed to add -k to avoid it deleting all outfiles if it can't find a final separator. Also if you want --digits, you need to use -n instead." — @Pebbl

awk '{f="file" NR; print $0 " -|"> f}' RS='-\\|'  input-file

Explanation (edited):

RS is the record separator, and this solution uses a gnu awk extension which allows it to be more than one character. NR is the record number.

The print statement prints a record followed by " -|" into a file that contains the record number in its name.

Debian has csplit, but I don't know if that's common to all/most/other distributions. If not, though, it shouldn't be too hard to track down the source and compile it...