add a todo item

doc/todo/automatic_bookkeeping_watch_command.mdwn

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+A "git annex watch" command would help make git-annex usable by users who
+don't know how to use git, or don't want to bother typing the git commands. 
+It would run, in the background, watching via inotify for changes, and
+automatically annexing new files, etc.
+
+The blue sky goal would be something automated like dropbox, except fully
+distributed. All files put into the repository would propigate out
+to all the other clones of it, as network links allow. Note that while
+dropbox allows modifying files, git-annex freezes them upon creation,
+so this would not be 100% equivilant to dropbox. --[[Joey]]
+
+----
+
+There is a `watch` branch in git that adds such a command, although currently
+it only handles adding new files, and nothing else. To make this really
+useful, it needs to:
+
+- notice deleted files and stage the deletion
+  (tricky; there's a race with add..)
+- notice renamed files, auto-fix the symlink, and stage the new file location
+- periodically auto-commit staged changes
+- honor .gitignore, not adding files it excludes
+    
+Also nice to have would be:
+    
+- Somehow sync remotes, possibly using a push sync like dvcs-autosync
+  does, so they are immediately updated.
+- Somehow get content that is unavilable. This is problimatic with inotify,
+  since we only get an event once the user has tried (and failed) to read
+  from the file. Perhaps instead, automatically copy content that is added
+  out to remotes, with the goal of all repos eventually getting a copy,
+  if df allows.
+- Drop files that have not been used lately, or meet some other criteria
+  (as long as there's a copy elsewhere).
+- Perhaps automatically dropunused files that have been deleted,
+  although I cannot see a way to do that, since by the time the inotify
+  deletion event arrives, the file is deleted, and we cannot see what
+  its symlink pointed to! Alternatievely, perhaps automatically
+  do an expensive unused/dropunused cleanup process.
+- Support OSes other than Linux; it only uses inotify currently.
+
+