Emacs ruby​​-mode 缩进行为

问题描述

Foo类attr_accessor :a,:time, # 自纪元以来的毫秒数:b,:C结尾

在文本模式下，'a' 之后列出的变量将按上述方式缩进，但在 ruby​​ 模式下，它们将与 'attr_accessor' 齐平.在这种情况下，如何让 ruby​​ 模式像文本模式一样缩进?请注意，除了所有其他 ruby​​-mode.el 缩进规则之外，我希望能够选择整个文件并点击 c-m- 以获取上述缩进.

解决方案

这个 hack 应该适用于大多数情况.

(defadvice ruby​​-indent-line (在 line-up-args 激活后)(let (indent prev-indent arg-indent)(节省游览(回缩进)(当(zerop(汽车(语法-ppss)))(setq indent (当前列))(skip-chars-backward "
")(当 (eq ?, (char-before))(ruby-backward-sexp)(回缩进)(setq prev-indent (current-column))(skip-syntax-forward "w_.")(skip-chars-forward " ")(setq arg-indent (current-column)))))(当预先缩进时(让((偏移量(-(当前列)缩进)))(cond ((< indent prev-indent)(缩进到上一个缩进))((= indent prev-indent)(缩进到 arg-indent)))(when (> offset 0) (forward-char offset))))))

示例:

class 注释 <ActiveRecord::Baseafter_create :send_email_to_author,:如果=>:author_wants_emails?,:除非=>Proc.new { |评论|comment.post.ignore_comments?}结尾

class Foo
  attr_accessor :a,
                :time, # ms since epoch
                :b,
                :c
end

In text mode, the variables listed after 'a' would indent as written above, but in ruby mode they would instead be flush with 'attr_accessor'. How can I get ruby mode to indent like text mode in this situation? Note that I'd like to be able to select the whole file and hit c-m- to get the above indentation in addition to all the other ruby-mode.el indentation rules.

解决方案

This hack should work in the majority of cases.

(defadvice ruby-indent-line (after line-up-args activate)
  (let (indent prev-indent arg-indent)
    (save-excursion
      (back-to-indentation)
      (when (zerop (car (syntax-ppss)))
        (setq indent (current-column))
        (skip-chars-backward "
")
        (when (eq ?, (char-before))
          (ruby-backward-sexp)
          (back-to-indentation)
          (setq prev-indent (current-column))
          (skip-syntax-forward "w_.")
          (skip-chars-forward " ")
          (setq arg-indent (current-column)))))
    (when prev-indent
      (let ((offset (- (current-column) indent)))
        (cond ((< indent prev-indent)
               (indent-line-to prev-indent))
              ((= indent prev-indent)
               (indent-line-to arg-indent)))
        (when (> offset 0) (forward-char offset))))))

Example:

class Comment < ActiveRecord::Base
  after_create :send_email_to_author,
               :if => :author_wants_emails?,
               :unless => Proc.new { |comment| comment.post.ignore_comments? }
end

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