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Gnus Manual

8.4.2 Mode Line Formatting

Mode line formatting variables (e.g., gnus-summary-mode-line-format) follow the same rules as other, buffer line oriented formatting variables (see section 8.4.1 Formatting Basics) with the following two differences:

1. There must be no newline (`\n') at the end.

2. The special `%%b' spec can be used to display the buffer name. Well, it's no spec at all, really---`%%' is just a way to quote `%' to allow it to pass through the formatting machinery unmangled, so that Emacs receives `%b', which is something the Emacs mode line display interprets to mean "show the buffer name". For a full list of mode line specs Emacs understands, see the documentation of the mode-line-format variable.