root:
             creates   file:./
             creates   file:plan.py
             creates   step:runpy ./plan.py

file:./
               state = STATIC
          created by   root:
            supplies   file:case1.txt
            supplies   file:case2.txt
            supplies   file:cases.txt
            supplies   file:plan.py
            supplies   file:work.py
            supplies   step:runpy ./plan.py
            supplies   step:runpy ./work.py case1.txt
            supplies   step:runpy ./work.py case2.txt

file:plan.py
               state = STATIC
          created by   root:
            consumes   file:./
            supplies   step:runpy ./plan.py

step:runpy ./plan.py
               state = SUCCEEDED
             env_var = STEPUP_PATH_FILTER [amended]
          created by   root:
            consumes   file:./
            consumes   file:cases.txt [amended]
            consumes   file:plan.py
             creates   file:cases.txt
             creates   file:work.py
             creates   step:runpy ./work.py case1.txt
             creates   step:runpy ./work.py case2.txt

file:cases.txt
               state = STATIC
          created by   step:runpy ./plan.py
            consumes   file:./
            supplies   step:runpy ./plan.py
            supplies   step:runpy ./work.py case1.txt
            supplies   step:runpy ./work.py case2.txt

file:work.py
               state = STATIC
          created by   step:runpy ./plan.py
            consumes   file:./
            supplies   step:runpy ./work.py case1.txt
            supplies   step:runpy ./work.py case2.txt

step:runpy ./work.py case1.txt
               state = FAILED
             env_var = STEPUP_PATH_FILTER [amended]
          created by   step:runpy ./plan.py
            consumes   file:./
            consumes   file:cases.txt
            consumes   file:work.py
             creates   file:case1.txt
            supplies   file:case1.txt

file:case1.txt
               state = OUTDATED
          created by   step:runpy ./work.py case1.txt
            consumes   file:./
            consumes   step:runpy ./work.py case1.txt

step:runpy ./work.py case2.txt
               state = PENDING
          created by   step:runpy ./plan.py
            consumes   file:./
            consumes   file:cases.txt
            consumes   file:work.py
             creates   file:case2.txt
            supplies   file:case2.txt

file:case2.txt
               state = AWAITED
          created by   step:runpy ./work.py case2.txt
            consumes   file:./
            consumes   step:runpy ./work.py case2.txt
