python - Emacs 中的单元模式

Question

假设我有一个缓冲区，代码(在本例中为 Python)组织如下:

.. cell 1 ..
## 
.. cell 2 ..

# this is a comment

### this is also a comment

.. still cell 2 ..

  ##
  .. cell 3 (code that is indented)

字符序列 ## 用于分隔缓冲区中的 cells(代码区域/ block )。字符 # 在 Python 中开始注释，因此 ## 被语言视为注释。类似的结构可以建立在例如。使用 ;; 或其他编程语言的 Elisp。

我想定义一个 Emacs 命令，当被调用时，它定义了当前的 cell(即 cell，point 所在的 cell/cursor 当前位于。)成为 Emacs region (即突出显示单元格)。

我如何在 Emacs 中执行此操作？

供引用:

• 类似于细胞的概念或 code sections在 MATLAB 中
• 这是一个thread在 Vim 中实现此功能。

Answer 1

这是一个解决方案:

(defun python-inside-comment-p ()
  (save-excursion
    (beginning-of-line 1)
    (looking-at "^#")))

(defun python-select-cell ()
  (interactive)
  (goto-char
   (if (re-search-backward "^\\s-*##[^#]" nil t)
       (match-end 0)
     (point-min)))
  (while (and (python-inside-comment-p)
              (eq 0 (forward-line 1)))
    nil)
  (set-mark (point))
  (goto-char
   (if (re-search-forward "^\\s-*\\(##[^#]\\)" nil t)
       (- (match-beginning 1) 2)
     (point-max))))

测试:

print "Beautiful is better than ugly."
##
print "Explicit is better than implicit."
print "Simple is better than complex."
print "Complex is better than complicated."
# this is a comment
print "Flat is better than nested."
### this is also a comment
print "Sparse is better than dense."
##
print "Readability counts."
print "Special cases aren't special enough to break the rules."
print "Although practicality beats purity."
print "Errors should never pass silently."
print "Unless explicitly silenced."

工作正常。 是否有理由不使用缩进级别而不是评论作为 anchor ？