Emacs hangs when using rope-goto-definition and rope-show-doc

[kajic]

When using the rope-goto-definition and rope-show-doc functions to goto/show library symbols I can more or less consistently get emacs to hang.

To enable introspection of libraries I added the following to $PROJECT_ROOT/.ropeproject/config.py:

VIRTUAL_ENV = "$HOME/.virtualenvs/$PROJECT_ROOT/"
ACTIVATE_FILE = VIRTUAL_ENV + "bin/activate_this.py"
execfile(ACTIVATE_FILE, dict(__file__=ACTIVATE_FILE))

It never seems to happen when jumping to project-local definitions, and not necessarily always when jumping to a library function. However, once I'm looking around in a library, it seems to always happen after one or two additional jumps. The only thing I can do to execute C-g a number of times, and quickly kill the Pymacs buffer. If I'm too slow with doing that it freezes again.

What can I do to investigate the cause of the problem?

[gabrielelanaro]

I found that rope causes a lot of hanging problems too, I'll check if I can reproduce your behaviour and try to help you. As a workaround I would suggest you to ditch rope altogether and use https://github.com/tkf/emacs-jedi which is so much faster and reliable.

The reason why jedi is not included in emacs-for-python is that it has a weird installation procedure based on virtualenv and I should find a way to wrap and bundle it.

[kajic]

I decided to try jedi instead. Thanks for the tip.

I wrote this to make jedi use my project-specific virtualenv. Maybe it can be useful to someone else:

(defun project-directory (buffer-name)
  (interactive)
  (let ((git-dir (file-name-directory buffer-name)))
    (while (and (not (file-exists-p (concat git-dir ".git")))
                git-dir)
      (setq git-dir
            (if (equal git-dir "/")
                nil
              (file-name-directory (directory-file-name git-dir)))))
    git-dir))

(defun project-name (buffer-name)
  (let ((git-dir (project-directory buffer-name)))
    (if git-dir
        (file-name-nondirectory
         (directory-file-name git-dir))
      nil)))

(defun virtualenv-directory (buffer-name)
  (let ((venv-dir (expand-file-name
                   (concat "~/.virtualenvs/" (project-name buffer-name)))))
    (if (and venv-dir (file-exists-p venv-dir))
        venv-dir
      nil)))

(defun setup-jedi-server-args ()
  (let ((venv-dir (virtualenv-directory buffer-file-name)))
    (when venv-dir (set 'jedi:server-args (list "--virtual-env" venv-dir)))))

(setq jedi:setup-keys t)
(add-hook 'python-mode-hook 'setup-jedi-server-args)
(add-hook 'python-mode-hook 'jedi:setup)