Changes to open-protocol-stream, preparing for merging it with open-network-stream.
* lisp/gnus/proto-stream.el: Changes preparatory to merging open-protocol-stream with open-network-stream. (proto-stream-always-use-starttls): Option removed. (open-protocol-stream): Return a process object by default. Provide a new parameter :return-list specifying a list-type return value, which now has the form (PROP . PLIST) instead of a fixed-length list. Change :type `network' to `try-starttls', and `network-only' to `default'. Make `default' the default, for compatibility with open-network-stream. Handle the no-parameter case exactly as open-network-stream, with no additional stream processing. Search plists using plist-get. Explicitly add :end-of-commend parameter if it is missing. (proto-stream-open-default): Renamed from proto-stream-open-network-only. Return 'default as the type. (proto-stream-open-starttls): Rename from proto-stream-open-network. Use plist-get. Don't return `tls' as the type if STARTTLS negotiation failed. Always return a list with a (possibly dead) process as the first element, for compatibility with open-network-stream. (proto-stream-open-tls): Use plist-get. Always return a list. (proto-stream-open-shell): Return `default' as connection type. (proto-stream-capability-open): Use plist-get. (proto-stream-eoc): Function deleted. * lisp/gnus/nnimap.el (nnimap-stream, nnimap-open-connection) (nnimap-open-connection-1): Handle renaming of :type parameter for open-protocol-stream. (nnimap-open-connection-1): Pass a :return-list parameter open-protocol-stream to obtain a list return value. Parse this list using plist-get. * lisp/gnus/nntp.el (nntp-open-connection): Handle renaming of :type parameter for open-protocol-stream. Accept open-protocol-stream return value that is a subprocess object instead of a list. Handle the case of a dead returned process.
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