vim: How do I line up ruby options?

With vim how do I to turn this:

t.string :crypted_password :null => false
t.string :password_salt, :null => false

into this:

t.string :cr开发者_运维问答ypted_password,  :null => false
t.string :password_salt,     :null => false

without manually adding the spaces to each line?

This would be possible with the Align plugin. Conveniently enough, you actually only need to align on whitespace to accomplish this, and Align has a built-in shortcut for that: \tsp (it operates on the visual mode selection).

If actual use cases could get more complex and whitespace alignment doesn't give the result you want, you can also define your own alignment - Align lets you specify it pretty precisely, with multiple separators, skipping separators...

Another alignment plugin: Tabular (documentation here). I personally haven't used it but Greg recommends it in the comments - it delimits by regular expression instead of fixed string.