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emacs: Allow part preferences to depend on message content.
Currently the preference for which sub-part of a multipart/alternative part is shown is global. Allow to the user to override the settings on a per-message basis by providing the ability to call a function that has access to the message to return the discouraged type list. The original approach is retained as the default.
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2 changed files with 17 additions and 5 deletions
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@ -520,11 +520,23 @@ This replaces spaces, percents, and double quotes in STR with
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"multipart/related"
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"multipart/related"
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))
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))
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(defun notmuch-multipart/alternative-choose (types)
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(defun notmuch-multipart/alternative-determine-discouraged (msg)
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"Return a list of preferred types from the given list of types"
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"Return the discouraged alternatives for the specified message."
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;; If a function, return the result of calling it.
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(if (functionp notmuch-multipart/alternative-discouraged)
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(funcall notmuch-multipart/alternative-discouraged msg)
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;; Otherwise simply return the value of the variable, which is
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;; assumed to be a list of discouraged alternatives. This is the
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;; default behaviour.
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notmuch-multipart/alternative-discouraged))
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(defun notmuch-multipart/alternative-choose (msg types)
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"Return a list of preferred types from the given list of types
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for this message, if present."
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;; Based on `mm-preferred-alternative-precedence'.
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;; Based on `mm-preferred-alternative-precedence'.
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(let ((seq types))
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(let ((discouraged (notmuch-multipart/alternative-determine-discouraged msg))
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(dolist (pref (reverse notmuch-multipart/alternative-discouraged))
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(seq types))
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(dolist (pref (reverse discouraged))
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(dolist (elem (copy-sequence seq))
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(dolist (elem (copy-sequence seq))
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(when (string-match pref elem)
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(when (string-match pref elem)
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(setq seq (nconc (delete elem seq) (list elem))))))
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(setq seq (nconc (delete elem seq) (list elem))))))
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@ -607,7 +607,7 @@ will return nil if the CID is unknown or cannot be retrieved."
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(plist-get part :content)))
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(plist-get part :content)))
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(defun notmuch-show-insert-part-multipart/alternative (msg part content-type nth depth button)
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(defun notmuch-show-insert-part-multipart/alternative (msg part content-type nth depth button)
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(let ((chosen-type (car (notmuch-multipart/alternative-choose (notmuch-show-multipart/*-to-list part))))
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(let ((chosen-type (car (notmuch-multipart/alternative-choose msg (notmuch-show-multipart/*-to-list part))))
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(inner-parts (plist-get part :content))
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(inner-parts (plist-get part :content))
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(start (point)))
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(start (point)))
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;; This inserts all parts of the chosen type rather than just one,
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;; This inserts all parts of the chosen type rather than just one,
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