Fermo.I18n.optionally_build_path_map

You're seeing just the callback optionally_build_path_map, go back to Fermo.I18n module for more information.
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optionally_build_path_map(map)

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Specs

optionally_build_path_map(map()) :: map()

Cross references all config pages, finding those with the same :id but with different locales.

Each page with an :id and :locale in its parameters has a :localized_paths Map added indicating which locale has which path.

E.g.

%{

 path: "/",
 template: "home.html.slim",
 params: %{
   id: "home_page",
   locale: :en,
   localized_paths: %{
     en: "/",
     it: "/it/"
   }
 }

}