Writing Your Own Sigils
You know by now that you can create strings and regular-expression literals using sigils:
| string = ~s{now is the time} |
| regex = ~r{..h..} |
Have you ever wished you could extend these sigils to add your own specific literal types? You can.
When you write a sigil such as ~s{...}, Elixir converts it into a call to the function sigil_s. It passes the function two values. The first is the string between the delimiters. The second is a list containing any lowercase letters that immediately follow the closing delimiter. (This second parameter is used to pick up any options you pass to a regex literal, such as ~r/cat/if.)
Here’s the implementation of a sigil ~l that takes a multiline string and returns a list containing ...
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