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The main idea is consider the notmuch database as analogous to the work-tree. A bare git repo is maintained in the users home directory, with a tree of the form tags/$message-id/$tag Like notmuch and git, we have a set of subcommnds, mainly modelled on git. Implementation wise, the heavy lifting is in the following functions. commit xapian -> git checkout git -> xapian merge fetched git + git -> xapian status find differences between xapian, git, and remote git. The central implementation trick, from an idea I think due to tomprince on IRC is manipulate the git index directly from the xapian tag information. The merge routine is still done using a temporary checkout as I wasn't able to get it working with the index only. There are also some convenience wrappers around git commands, like "fetch" that essential just set GIT_DIR in the environment. In order to encode tags (viewed as octet sequences) into filenames, we whitelist a smallish set of characters and %hex escape anything outside. The prefix is omitted in git, which lets one save and restore to different prefixes (although this is only lightly tested). Thanks to Tomi Ollila for a huge amount of feedback and patches while putting this together. |
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