在状态栏中显示十六进制值的二进制版本

Question

我现在正在做很多嵌入式 C 编程，这意味着我一直在写这样的东西：

(ioe_extra_A & 0xE7)

如果将光标放在 0xE7 上，emacs 会在状态栏或迷你缓冲区中显示“0b1110 0111”，这将非常有用，所以我可以检查我的掩码是否是我的意思。

通常，无论我想让 emacs 做什么，10 分钟的谷歌搜索都会找到答案，但是对于这个，我已经用尽了我的搜索技能，仍然没有找到答案。

提前谢谢。

Answer 1

这似乎有效：

(defvar my-hex-idle-timer nil)

(defun my-hex-idle-status-on ()
  (interactive)
  (when (timerp my-hex-idle-timer)
    (cancel-timer my-hex-idle-timer))
  (setq my-hex-idle-timer (run-with-idle-timer 1 t 'my-hex-idle-status)))

(defun my-hex-idle-status-off ()
  (interactive)
  (when (timerp my-hex-idle-timer)
    (cancel-timer my-hex-idle-timer)
    (setq my-hex-idle-timer nil)))

(defun int-to-binary-string (i)
  "convert an integer into it's binary representation in string format
By Trey Jackson, from https://stackoverflow.com/a/20577329/."
  (let ((res ""))
    (while (not (= i 0))
      (setq res (concat (if (= 1 (logand i 1)) "1" "0") res))
      (setq i (lsh i -1)))
    (if (string= res "")
        (setq res "0"))
    res))

(defun my-hex-idle-status ()
  (let ((word (thing-at-point 'word)))
    (when (string-prefix-p "0x" word)
      (let ((num (ignore-errors (string-to-number (substring word 2) 16))))
    (message "In binary: %s" (int-to-binary-string num))))))

输入 M-x my-hex-idle-status-on 将其打开。

如前所述，感谢Trey Jackson int-to-binary-string。