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Use add-zsh-hook to add functions to hooks. That way they won't be added again
when doing `source ~/.zshrc` multiple times.
Co-authored-by: Marc Cornellà <marc.cornella@live.com>

This plugin did not work, I just found the same functionnality in grml, this one works.

Reorganizing plugins so that each plugin has it's own directory now so that any plugin-specific functions can be bundled within there.

shell metacharacters.