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The main project I work on is split up into multiple git projects. I'd like to be able to Ctrl-P search for files in a different project than the one I'm currently in, but as far as I can tell, I can't make Ctrl-P search anything other than the current git project (since it stops when it finds the .git ancestor).
Is there a way to tell Ctrl-P to search in multiple .git projects?
There are a few options depending on the layout of directories.
If all these repos are contained in a single root folder that you want to search, then you can search that directory explicitly by running :CtrlP myproject. Alternatively, I believe you could say let g:ctrlp_root_markers=['.root'] and make a .root file in the root (myproject) directory.
If for some strange reason you can't put all these directories in one root, you could make a directory somewhere else, put symlinks in it to all the directories you want searched, put let g:ctrlp_follow_symlinks=1 in your .vimrc, and explicitly tell CtrlP to use this directory when running (:CtrlP mynewroot).
Failing that, you could modify ctrlp_user_command, but doing so gets complicated and will ignore other ctrlp settings.
:CtrlP myproject was what I needed. Note to anyone else looking at this, myproject is the path to the directory that you want to use as your parent.