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gnus: User-Defined Specs

 
 9.4.4 User-Defined Specs
 ------------------------
 
 All the specs allow for inserting user defined specifiers—‘u’.  The next
 character in the format string should be a letter.  Gnus will call the
 function ‘gnus-user-format-function-’‘X’, where ‘X’ is the letter
 following ‘%u’.  The function will be passed a single parameter—what the
 parameter means depends on what buffer it’s being called from.  The
 function should return a string, which will be inserted into the buffer
 just like information from any other specifier.  This function may also
 be called with dummy values, so it should protect against that.
 
    Also Gnus supports extended user-defined specs, such as ‘%u&foo;’.
 Gnus will call the function ‘gnus-user-format-function-’‘foo’.
 
    You can also use tilde modifiers (Advanced Formatting to
 achieve much the same without defining new functions.  Here’s an
 example: ‘%~(form (count-lines (point-min) (point)))@’.  The form given
 here will be evaluated to yield the current line number, and then
 inserted.
 

Info Catalog gnus: Advanced Formatting gnus: Formatting Variables gnus: Formatting Fonts