Grant Edwards <gr****@visi.comwrites:
I've recently switched from Jed to Emacs for editing python
source, and I'm still stumped as to how one indents or dedents
a region of code. In Jed it's 'C-c <' or 'C-c >'. Google has
found several answers, but none of them work, for example I've
tried bot "C-c tab" and "C-c C-r" based on postings Google has
found, but neither appears to actually _do_ anyting.
In python-mode C-c and C-c < should work as well.
(note that you have to download python-mode.el; I don't know if the above also
works with python.el which comes with emacs; C-h m will tell you which mode
you're using)
Outside python-mode, you can use string-rectangle and kill-rectangle, but
that's inconvenient, so I've globally bound the below functions to these keys
(you can just use the plain py-shift-region{-left,right} if you like them
better).
(defun my-py-shift-region-left (start end &optional count)
"Like `py-shift-region-left', but COUNT applies the command repeatedly,
instead of specifying the columns to shift."
(interactive
(let ((p (point))
(m (mark))
(arg (* py-indent-offset (or current-prefix-arg 1))))
(if m
(list (min p m) (max p m) arg)
(list p (save-excursion (forward-line 1) (point)) arg))))
;; if any line is at column zero, don't shift the region
(save-excursion
(goto-char start)
(while (< (point) end)
(back-to-indentation)
(when (and (< (current-column) count)
(not (looking-at "\\s *$")))
(error "Not enough left margin"))
(forward-line 1)))
(py-shift-region start end (- (prefix-numeric-value
(or count))))
(py-keep-region-active))
(defun my-py-shift-region-right (start end &optional count)
"Like `py-shift-region-right', but COUNT applies the command repeatedly,
instead of specifying the columns to shift."
(interactive
(let ((p (point))
(m (mark))
(arg current-prefix-arg))
(if m
(list (min p m) (max p m) arg)
(list p (save-excursion (forward-line 1) (point)) arg))))
(py-shift-region start end (prefix-numeric-value
(or count py-indent-offset)))
(py-keep-region-active))
'as
