ESS：从以 ESS[R] 次等模式或脚本输入的命令检索命令历史记录

Question

在低级模式下使用 ESS[R] 时，我可以使用 C-c C-p 检索最新的命令输出，这会将光标移动到上一个命令输出。或者，我可以使用 C-up ，它基本上从下级进程复制最近输入的命令（类似于 readline 的工作方式）。我更喜欢 C-up 方法，但不幸的是，它不会检索使用任何 ess-eval 逗号从脚本输入的命令。对于在低级模式和 ess-eval 中输入的命令，是否可以获得 C-up 的功能？

Answer 1

您的解决方案适用于单行命令，但需要稍作调整才能处理多行语句：

(defun ess-readline ()
  "Move to previous command entered from script *or* R-process and copy 
   to prompt for execution or editing"
  (interactive)
  ;; See how many times function was called
  (if (eq last-command 'ess-readline)
      (setq ess-readline-count (1+ ess-readline-count))
    (setq ess-readline-count 1))
  ;; Move to prompt and delete current input
  (comint-goto-process-mark)
  (end-of-buffer nil) ;; tweak here
  (comint-kill-input)
  ;; Copy n'th command in history where n = ess-readline-count
  (comint-previous-prompt ess-readline-count)
  (comint-copy-old-input)
  ;; Below is needed to update counter for sequential calls
  (setq this-command 'ess-readline)
)
(global-set-key (kbd "\C-cp") 'ess-readline)

这使您可以向上移动之前的命令；以下功能使您可以再次向下移动，因此您可以上下查找您要执行的命令：

(defun ess-readnextline ()
  "Move to next command after the one currently copied to prompt and copy 
   to prompt for execution or editing"
  (interactive)
  ;; Move to prompt and delete current input
  (comint-goto-process-mark)
  (end-of-buffer nil)
  (comint-kill-input)
  ;; Copy (n - 1)'th command in history where n = ess-readline-count
  (setq ess-readline-count (max 0 (1- ess-readline-count)))
  (when (> ess-readline-count 0)
      (comint-previous-prompt ess-readline-count)
  (comint-copy-old-input))
  ;; Update counter for sequential calls
  (setq this-command 'ess-readline)
)
(global-set-key (kbd "\C-cn") 'ess-readnextline)

Answer 2

似乎没有任何内置函数可以做到这一点，所以我编写了下面的函数。本质上，此函数自动使用按键 C-c C-p 将光标移动到 R 进程缓冲区中的前一个命令，然后 C-c RET 将该命令复制到提示符以进行编辑

(defun ess-readline ()
  "Move to previous command entered from script *or* R-process and copy 
   to prompt for execution or editing"
  (interactive)
  ;; See how many times function was called
  (if (eq last-command 'ess-readline)
      (setq ess-readline-count (1+ ess-readline-count))
    (setq ess-readline-count 1))
  ;; Move to end of buffer and delete current input
  (end-of-buffer nil)
  (comint-kill-input)
  ;; Copy n'th command in history where n = ess-readline-count
  (comint-previous-prompt ess-readline-count)
  (comint-copy-old-input)
  ;; Below is needed to update counter for sequential calls
  (setq this-command 'ess-readline)
)
(global-set-key (kbd "\C-cp") 'ess-readline)