Reviewing Day two of README.org about spacemacs-rocks HOT 5 CLOSED

（xxx-mode t）和（xxx-mode）不一样。前者turn on 后者toggle。在这里一样。我自己写了个宏来处理这个问题，用数字1和-1。

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Note that ' matches the end of a string, where as $ matches the empty string before a newline. Thus, $ may lead to unexpected behavior when dealing with filenames containing newlines. (Should be pretty rare… ;))

backtick同理。

boundary anchors
Pattern Matches
^… Beginning of {line, string, buffer}
…$ End of {line, string, buffer}
`… Beginning of {string, buffer}
…' End of {string, buffer}
\b word boundary marker

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1. Eli 是我写错了。
2. 所有文中的 Emacs Lisp 的注释均使用 ;;。
3. 我 (xxx-mode t) 我马上会将文字版中的 t 全部换成 1 来统一格式。

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（xxx-mode t）和（xxx-mode）不一样。前者turn on 后者toggle。在这里一样。我自己写了个宏来处理这个问题，用数字1和-1。

这两者是一样的（如果不一样的话，证据是什么？）

(delete-selection-mode)
    ⇒ t

(delete-selection-mode t)
    ⇒ t

(delete-selection-mode 'toggle)
    ⇒ nil

从 Lisp 调用和交互式调用，对参数的解释不一样，这里我们讨论的是前者。

Note that ' matches the end of a string, where as $ matches the empty string before a newline. Thus, $ may lead to unexpected behavior when dealing with filenames containing newlines. (Should be pretty rare… ;))

清楚一些了。（引用自哪里？）

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引用自EmacsWiki AutoModeList。下面的表来自Xah Emacs。

       ;; The actual function.
       (defun ,modefun (&optional arg ,@extra-args)
     ,(or doc
          (format (concat "Toggle %s on or off.
With a prefix argument ARG, enable %s if ARG is
positive, and disable it otherwise.  If called from Lisp, enable
the mode if ARG is omitted or nil, and toggle it if ARG is `toggle'.
\\{%s}") pretty-name pretty-name keymap-sym))
     ;; Use `toggle' rather than (if ,mode 0 1) so that using
     ;; repeat-command still does the toggling correctly.
     (interactive (list (or current-prefix-arg 'toggle)))

恩，不过有的地方（比如hydra）会调用funcall-interactively。要小心。

           (,@setter
            (if (eq arg 'toggle)
                (not ,getter)
              ;; A nil argument also means ON now.
              (> (prefix-numeric-value arg) 0)))

所以还是-1稳妥。

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