# make a check point for where we start
$ dof checkpoint save
$ dof checkpoint list 
 Checkpoints 
┏━━━━━━━━━━┳━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ uuid ┃ tags ┃ timestamp ┃
┡━━━━━━━━━━╇━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
│ 048f93a3 │ ['048f93a3'] │ 2025年02月18日 23:41:32.013738+00:00 │
└──────────┴──────────────┴──────────────────────────────────┘
# list the user requested specs in your current environment
$ dof user-specs 
the user requested specs in this environment are:
 conda
 hatch
 numpy
 pip
 pytest
 pytest-cov
 python >=3.12
 twine >=5.0.0
# install a new package 
$ conda install matplotlib
# list the user requested specs in your current environment
$ dof user-specs 
the user requested specs in this environment are:
 conda
 hatch
 matplotlib <--- notice the new user requested spec
 numpy
 pip
 pytest
 pytest-cov
 python >=3.12
 twine >=5.0.0
# save a checkpoint
$ dof checkpoint save
$ dof checkpoint list 
 Checkpoints 
┏━━━━━━━━━━┳━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ uuid ┃ tags ┃ timestamp ┃
┡━━━━━━━━━━╇━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
│ 16d91835 │ ['16d91835'] │ 2025年02月18日 23:43:34.367435+00:00 │
│ 048f93a3 │ ['048f93a3'] │ 2025年02月18日 23:41:32.013738+00:00 │
└──────────┴──────────────┴──────────────────────────────────┘
# list the user requested specs in an older environment
$ dof user-specs --rev 048f93a3 
the user requested specs rev 048f93a3:
 conda
 hatch
 numpy
 pip
 pytest
 pytest-cov
 python >=3.12
 twine >=5.0.0