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When I am running helm-ag commands in a large project with multiple git submodules, the shared libaries are repeatedly searched. I do not want those be searched.

So how can I change the helm-ag commands' behavior to achieve that?

The helm-ag library I mentioned above is here: https://github.com/syohex/emacs-helm-ag

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You can do that by adding a .agignore (or .ignore if you use ag 2.0.0) to the root of your project with a list of folders that you want to ignore. You have to set helm-ag-use-grep-ignore-list to non-nil value to use this file.

There is other way to do that by only changing your emacs configuration. You set helm-ag-use-grep-ignore-list to non-nil value and add the directories that you want to ignore to grep-find-ignored-directories. You can find an example of use of grep-find-ignored-directories in Endless Parentheses.

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