Ruby sempre recua 2 espaços?

Gostaria de usar recuos de 2 espaços o tempo todo, como:

sidekiq_options({
  retry: true
})

Eu tentei definir .emacs.d/init.elpara:

(setq-default indent-tabs-mode nil)
(setq-default tab-width 2)
(setq indent-line-function 'insert-tab)

(setq ruby-deep-indent-paren nil)
(setq ruby-deep-indent-paren-style nil)

Mas ainda tenho coisas parecidas com:

sidekiq_options({
                  retry: true
                })

Não sou um usuário ruby, mas você pode tentar o seguinte:

(setq-default indent-tabs-mode nil)
(setq-default tab-width 4)   ;; change this to 2 if that is the width
(setq indent-line-function 'insert-tab)

Tudo o que você precisa fazer é definir ruby-indent-level. Por exemplo (setq-local ruby-indent-level 2).

EDIT :

Você pode usar enh-ruby-mode, instalável a partir de melpa, e (setq enh-ruby-deep-indent-paren nil).

Isso resultou no seguinte recuo:

sidekiq_options({
  retry: true
})

Olhando para o código de ruby-mode, parece que não há como configurá-lo. Uma solução alternativa está substituindo a função. Experimente o código abaixo e veja se funciona:

(defun ruby-smie-rules (kind token)
  (pcase (cons kind token)
    (`(:elem . basic) ruby-indent-level)
    ;; "foo" "bar" is the concatenation of the two strings, so the second
    ;; should be aligned with the first.
    (`(:elem . args) (if (looking-at "\\s\"") 0))
    ;; (`(:after . ",") (smie-rule-separator kind))
    (`(:before . ";")
     (cond
      ((smie-rule-parent-p "def" "begin" "do" "class" "module" "for"
                           "while" "until" "unless"
                           "if" "then" "elsif" "else" "when"
                           "rescue" "ensure" "{")
       (smie-rule-parent ruby-indent-level))
      ;; For (invalid) code between switch and case.
      ;; (if (smie-parent-p "switch") 4)
      ))
    (`(:before . ,(or `"(" `"[" `"{"))
     (cond
      ((and (equal token "{")
            (not (smie-rule-prev-p "(" "{" "[" "," "=>" "=" "return" ";"))
            (save-excursion
              (forward-comment -1)
              (not (eq (preceding-char) ?:))))
       ;; Curly block opener.
       (ruby-smie--indent-to-stmt))
      ((smie-rule-hanging-p)
       ;; Treat purely syntactic block-constructs as being part of their parent,
       ;; when the opening token is hanging and the parent is not an
       ;; open-paren.
       (cond
        ((eq (car (smie-indent--parent)) t) nil)
        ;; When after `.', let's always de-indent,
        ;; because when `.' is inside the line, the
        ;; additional indentation from it looks out of place.
        ((smie-rule-parent-p ".")
         ;; Traverse up the call chain until the parent is not `.',
         ;; or `.' at indentation, or at eol.
         (while (and (not (ruby-smie--bosp))
                     (equal (nth 2 (smie-backward-sexp ".")) ".")
                     (not (ruby-smie--bosp)))
           (forward-char -1))
         (smie-indent-virtual))
        (t (smie-rule-parent))))))
    (`(:after . ,(or `"(" "[" "{"))
     ;; FIXME: Shouldn't this be the default behavior of
     ;; `smie-indent-after-keyword'?
     (save-excursion
       (smie-rule-parent)))
    (`(:before . " @ ")
     (save-excursion
       (skip-chars-forward " \t")
       (cons 'column (current-column))))
    (`(:before . "do") (ruby-smie--indent-to-stmt))
    (`(:before . ".")
     (if (smie-rule-sibling-p)
         (and ruby-align-chained-calls 0)
       (smie-backward-sexp ".")
       (cons 'column (+ (current-column)
                        ruby-indent-level))))
    (`(:before . ,(or `"else" `"then" `"elsif" `"rescue" `"ensure"))
     (smie-rule-parent))
    (`(:before . "when")
     ;; Align to the previous `when', but look up the virtual
     ;; indentation of `case'.
     (if (smie-rule-sibling-p) 0 (smie-rule-parent)))
    (`(:after . ,(or "=" "+" "-" "*" "/" "&&" "||" "%" "**" "^" "&"
                     "<=>" ">" "<" ">=" "<=" "==" "===" "!=" "<<" ">>"
                     "+=" "-=" "*=" "/=" "%=" "**=" "&=" "|=" "^=" "|"
                     "<<=" ">>=" "&&=" "||=" "and" "or"))
     (and (smie-rule-parent-p ";" nil)
          (smie-indent--hanging-p)
          ruby-indent-level))
    (`(:after . ,(or "?" ":")) ruby-indent-level)
    (`(:before . ,(guard (memq (intern-soft token) ruby-alignable-keywords)))
     (when (not (ruby--at-indentation-p))
       (if (ruby-smie--indent-to-stmt-p token)
           (ruby-smie--indent-to-stmt)
         (cons 'column (current-column)))))
    (`(:before . "iuwu-mod")
     (smie-rule-parent ruby-indent-level))
    ))

A parte que editei está logo abaixo do FIXME, alterando para (smie-rule-parent), e pareceu funcionar para mim.