Exlibris

A collection of random functions that I've used in more than one project:

pipe_while_ok

Create pipelines that terminate early if any step fails to return a tuple that starts {:ok, ...}
before_returning

Like Ruby's returning, it evaluates its first argument, then evaluates the do block. It always returns the value of its first argument.

The do block is like the body of a case, in that it receives the value of the first argument and patterns matches on it.
```
before_returning File.open(name) do
  {:ok, _file} -> Logger.debug("#{name} opened OK")
  {:error, reason} -> Logger.error("Opening #{name}: #{:file.format_error(reason)}")
end
```

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