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gnus: Mode Line Formatting

 
 9.4.2 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 (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.
 

Info Catalog gnus: Formatting Basics gnus: Formatting Variables gnus: Advanced Formatting