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23.7.1.8 Sample Indentation Rules

Here is an example of an indentation function:

(defun sample-smie-rules (kind token)
  (pcase (cons kind token)
    (`(:elem . basic) sample-indent-basic)
    (`(,_ . ",") (smie-rule-separator kind))
    (`(:after . ":=") sample-indent-basic)
    (`(:before . ,(or `"begin" `"(" `"{")))
     (if (smie-rule-hanging-p) (smie-rule-parent)))
    (`(:before . "if")
     (and (not (smie-rule-bolp)) (smie-rule-prev-p "else")
          (smie-rule-parent)))))

A few things to note:

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