more verb proposals, catch and each

[max-mapper]

run
  catch email-me.py
    download
  process

pipeline download
  each scrape-each-search-page.py
    collect download-xml
      parse xml into json
    get pdf id from json
    construct full pdf url
    add to download queue

pipeline process
  map
    hash pdf
    catch email-me
      exists.py
      create-thumbnail

[onbjerg]

How does the each keyword differ from the proposed keyword fork in Datscript? @maxogden

I assume they both run another pipeline from the result of a command as stdin for that given pipeline.. if that makes sense.