The PrefixDir function

The iris.PrefixDir function wraps an existing "fs" file system and returns a new one which open files by prepending the path with the given "prefix".
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func PrefixDir(prefix string, fs http.FileSystem) http.FileSystem
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It is extremely useful when you use a go-bindata file to embed both view templates and public static files. With PrefixDir you can select which directory to use to serve static files and which to render views.
Example
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│   main.go
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|   bindata.go
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└───data/
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└──────views/
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│         ...your templates
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└──────public/
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│         ...your public assets
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Let's build the bindata.go file which will contain the embedded ./data directory:
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$ go get -u github.com/go-bindata/go-bindata/...
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$ go-bindata -fs ./data/...
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Use the ./data/views for templates and ./data/public for file server:
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templatesFS := iris.PrefixDir("./data/views", AssetFile())
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app.RegisterView(iris.HTML(templatesFS, ".html"))
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​
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publicFS := iris.PrefixDir("./data/public", AssetFile())
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app.HandleDir("/", publicFS)
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