ris.py

#!/usr/bin/env python

# run as ris.py importdir1 importdir2 ...

import glob, sys, os, re

ris = ''
for importdir in sys.argv[1:]:
  for pdf in glob.glob(os.path.join(importdir, '*.pdf')):
    m = re.match(r'^(.+?)@(.+?)\$(.+?).pdf$', os.path.basename(pdf))
    if m:
      title, author, year = [g.strip() for g in m.groups()]
      ris += 'TY  - JOUR\n'
      ris += 'TI  - ' + title + '\n'
      ris += 'AU  - ' + author + '\n'
      ris += 'DA  - ' + year + '///\n'
      ris += 'PY  - ' + year + '\n'
      ris += 'L1  - ' + pdf + '\n'
      ris += 'ER  -\n'
      ris += '\n'

print(ris) # or write it to a file