Like the Rbyd class, Btree serves as an abstraction for littlefs's
btrees in Python.
New classes:
- Btree - btree abstraction, note this does _not_ inherit from Rbyd. I
find that sort of inheritance too error-prone. Instead Btree
_contains_ the root rbyd, which can always be accessed via Btree.rbyd.
If you want low-level root-rbyd details, just access Btree.rbyd.
Though most fields that are relevant to the Btree are also forwarded
via Python's @property properties.
- Bd - This just serves as a handle for the disk file that includes
block_size/block_count metadata.
One important change to note is the adoption of required vestigial names
in all btree nodes (yes this scripts was written... checks notes...
2 years ago... even the same month huh). This means we don't need the
parent name mapping, so the non-inner btree printing code no longer
needs to be extremely confusing at all times.
Also adopted the Rbyd class and friends, and backported Bd to
dbgrbyd.py.
Also tried to give a couple useful algorithms their own self-contained
functions, mainly:
- pathdelta - for emulating a traversal over exhaustive paths
- treerepr - for the common ascii tree rendering code
Christopher Haster
46c55722a5