vi is my editor of choice when I need to do some quick editing.

When vi edits a file, it will usally create a swp file for recovery purpose. Usually it causes no problem.

But apparently octopress does not work when there is temporry file in the post directory. Rake will emit

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rake aborted!
No such file or directory - public/_posts/.2013-06-29-example.markdown.swp

and then bailed.

I added

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set backupdir=~/tmp

to my .vimrc. Hopefully it will prevent this problem from happening again.