Code Folding with Emacs

[Thomas Sicheritz-Ponten]

gb at cs.unc.edu writes:


Have you looked at folding.el?
(fold-add-to-marks-list 'python-mode         "# {{{ "  "# }}}" nil t)
(load "folding.el" 'nomessage 'noerror)

> It is really easy to get code folding going with Python mode in
> Emacs. Just use the builtin outline-minor-mode and set up the
> outline-regexp and outline-level to work with Python. It really works
> well for me and has a nice menu or keyboard interface as well.
> 
> Here is what I put in my .emacs to make it work.
> 
> gb
> 
> ;; setup python mode
> (setq auto-mode-alist ; trigger python mode automatically
>       (cons '("\\.py$" . python-mode) auto-mode-alist))
> (setq interpreter-mode-alist
>       (cons '("python" . python-mode)
> 	    interpreter-mode-alist))
> (autoload 'python-mode "python-mode" "Python editing mode." t)
> ; add my customization
> (add-hook 'python-mode-hook 'my-python-hook)
> ; this gets called by outline to deteremine the level. Just use the length of the whitespace
> (defun py-outline-level ()
>   (let (buffer-invisibility-spec)
>     (save-excursion
>       (skip-chars-forward "\t ")
>       (current-column))))
> ; this get called after python mode is enabled
> (defun my-python-hook ()
>   ; outline uses this regexp to find headers. I match lines with no indent and indented "class"
>   ; and "def" lines.
>   (setq outline-regexp "[^ \t]\\|[ \t]*\\(def\\|class\\) ")
>   ; enable our level computation
>   (setq outline-level 'py-outline-level)
>   ; do not use their \C-c@ prefix, too hard to type. Note this overides some python mode bindings
>   (setq outline-minor-mode-prefix "\C-c")
>   ; turn on outline mode
>   (outline-minor-mode t)
>   ; initially hide all but the headers
>   (hide-body)
>   ; I use CUA mode on the PC so I rebind these to make the more accessible
>   (local-set-key [?\C-\t] 'py-shift-region-right)
>   (local-set-key [?\C-\S-\t] 'py-shift-region-left)
>   ; make paren matches visible
>   (show-paren-mode 1)
> )

-- 
Sicheritz-Ponten Thomas, Ph.D, thomas at biopython.org      (
Center for Biological Sequence Analysis                   \
BioCentrum-DTU, Technical University of Denmark            )
CBS: +45 45 252485      Building 208, DK-2800 Lyngby  ##----->
Fax: +45 45 931585      http://www.cbs.dtu.dk/thomas       )
                                                          /
     ... damn arrow eating trees ...                     (