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add some IRC notes
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:Basically, all versions of a document would appear within the list view timeline. Their order within the list would be determined by their timestamp. If I work on 3 iterative versions of a document, then go back to the second version and make changes, I get a new 4th version which appears as the most recent item in the Journal. It doesn't matter (at least here) that I technically have a branch at version 2, which has children 3 and 4. What matters in the Journal perspective is that I worked on version 4 most recently. The tree is flattened into a list in the time dimension.
 
:Basically, all versions of a document would appear within the list view timeline. Their order within the list would be determined by their timestamp. If I work on 3 iterative versions of a document, then go back to the second version and make changes, I get a new 4th version which appears as the most recent item in the Journal. It doesn't matter (at least here) that I technically have a branch at version 2, which has children 3 and 4. What matters in the Journal perspective is that I worked on version 4 most recently. The tree is flattened into a list in the time dimension.
 
:This is also the reason that the latest Journal designs split the UI into "action" and "object" views. The action view would be a temporal history of everything you've done (with each version through time). The object view would represent each object only once, by it's most recent version, thus providing a much shorter list.
 
:This is also the reason that the latest Journal designs split the UI into "action" and "object" views. The action view would be a temporal history of everything you've done (with each version through time). The object view would represent each object only once, by it's most recent version, thus providing a much shorter list.
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=== IRC notes ===
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;bemasc:
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:Activities are stateless functions.  That is, an Activity has no intrinsic state; if you start it blank, it's the same every time.
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:All state lives in the Datastore.  When you launch an Activity with a Journal entry as input, it produces output that goes back in the Journal.
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:Consider what happens when a user "resumes" an entry twice, maybe even with two different activities.  What should happen?
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:It seems pretty clear to me that the result should be two entries, representing the output of each of these activities. <nowiki>[</nowiki>new branch, with same or different name]
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:<nowiki>[</nowiki>example for whole-tree activity state: wine activity]
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:<nowiki>[</nowiki>xdelta for binary diffs]
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:<nowiki>[</nowiki>in-place execution of activities from datastore]
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;tomeu:
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:<nowiki>[</nowiki>opportunistic hardlinking using mtime+checksum]
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;silbe:
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:<nowiki>[</nowiki>filenames are just metadata]
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;homunq:
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:<nowiki>[</nowiki>evaluate bazaar etc. as backend] -- SS: potential conflict with XIP - though git might be fine
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