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  • Committer: Martin Pool
  • Date: 2009-03-03 01:45:32 UTC
  • mto: (4070.4.5 gnu-changelog)
  • mto: This revision was merged to the branch mainline in revision 4081.
  • Revision ID: mbp@sourcefrog.net-20090303014532-d223fxy97cb1og8f
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doc/developers/annotate.txt
 
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Annotate
 
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========
 
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Broadly tries to ascribe parts of the tree state to individual commits.
 
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There appear to be three basic ways of generating annotations:
 
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If the annotation works by asking the storage layer for successive full texts
 
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then the scaling of this will be proportional to the time to diff throughout
 
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the history of thing being annotated.
 
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If the annotation works by asking the storage layer for successive deltas
 
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within the history of the thing being annotated we believe we can make it scale
 
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broadly proportional to the depth of the tree of revisions of the annotated
 
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object.
 
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If the annotation works by combining cached annotations such that creating a
 
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full text recreates annotations for it then it will scale with the cost of
 
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obtaining that text.
 
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Generally we want our current annotations but it would be nice to be able to do
 
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whitespace annotations and potentially other diff based annotations.
 
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Some things to think about:
 
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 * Perhaps multiparent deltas would allow us to not store the cached
 
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   annotations in each delta without losing performance or accuracy.
 
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