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Refactor the isochrone graph computation

David Douard requested to merge generated-differential-D5773-source into generated-differential-D5773-target

attempt to simplify a bit this part of the code:

  • IsochroneNode are now only used for directories
  • FileEntry are stored in a new IsochroneNode.files attribute, so
  • IsochroneNode.children only stores IsochroneNode (thus DirectoryEntry) objects,
  • rename IsochroneNode.date as 'dbdate' and clarify its semantics

Also (in dedicated revisions):

  • Improve a bit the code of ProvenanceDBBase
  • Add str methods to RevisionEntry, DirectoryEntry and FileEntry to ease logging and debugging.
  • Add 'ls_files()' and 'ls_dirs()' methods to the DirectoryEntry class to make it a bit easier to compute the isochrone graph (see following revisions).

Depends on !17 (closed)

Migrated from D5773 (view on Phabricator)

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