28 lines
2.3 KiB
Markdown
28 lines
2.3 KiB
Markdown
# Algorithm
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## Sources
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We have three record sources:
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1. Local files
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2. Remote files
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3. Local "delete-or-rename" history.
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Assuming all sources are reliable.
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## Deal with them
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We list all combinations mutually exclusive and collectively exhaustive.
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| ID | Remote Files | Local files | Local delete rename history | Extra | Decision |
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| ---- | ------------ | ----------- | --------------------------- | ----------------------------------------------- | ------------------------------------------------------------ |
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| 1 | exist | exist | ignore | mtime_remote > mtime_local | download remote file, create local folder if not exists, clear local history if exists |
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| 2 | exist | exist | ignore | mtime_remote <= mtime_local | upload local file, create remote folder if not exists, clear local history if exists |
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| 3 | exist | exist | ignore | If local is a folder. mtime_local === undefined | clear local history if exists. TODO: what if a folder and a previous file share the same name? |
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| 4 | exist | not exist | exist | mtime_remote >= delete_time_local | download remote file, create folder if not exists |
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| 5 | exist | not exist | exist | mtime_remote < delete_time_local | delete remote file, clear local history |
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| 6 | exist | not exist | not exist | | download remote file, create folder if not exists |
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| 7 | not exist | exist | ignore | If local is a single file. | upload local file, create remote folder if not exists, clear local history if exists |
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| 8 | not exist | exist | ignore | If local is a folder. | upload local files recursively, create remote folder if not exists, clear local history if exists |
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| 9 | not exist | not exist | ignore | | clear local history if exists |
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