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Truncation in Emacs Powerline (mode line)

Is there a way to get some elements truncated in (excellent) Emacs Powerline? I think in particular in the section which-func-mode

in the default mode line. It would be nice to see only the first N characters of the function name or section name (in Org mode), N for the definition.

Question: is it possible to just disable components (i.e. not display) if the frame is too narrow (e.g. 80 characters)?

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Typically you can tweak which-func-format

accordingly, for example:

(setq which-func-format
      `("["
        (:propertize (:eval (my-which-func-current))
                     local-map ,which-func-keymap
                     face which-func
                     mouse-face mode-line-highlight
                     help-echo "mouse-1: go to beginning\n\
mouse-2: toggle rest visibility\n\
mouse-3: go to end")
        "]")
      )

Where my-which-func-current

is the function that truncates the current function name accordingly:



(defun my-which-func-current ()
  (let ((current (gethash (selected-window) which-func-table)))
    (if current
        (truncate-string-to-width current 20 nil nil "…")
      which-func-unknown)))

This approach works with a standard mode string and any line expansion pack that supports standard mode data. I know what Smart Mode Line does, but I'm not sure about Powerline. I am not using any of these packages.

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