which calculates column title.
MINIMUM-LENGTH : Minimum width of column (number or name of function).
The function must return a positive integer.
-MAXIMUM-LENGTH : Maximum width of column (number or name of function)
- (currently ignored).
+MAXIMUM-LENGTH : Ignored.
ALIGNMENT : Alignment of column (`left', `right', `middle').
FUN-OR-STRING : Name of a function for calculating the value or a
string for a constant value.
-The function gets as parameter the buffer where we have started
-buffer selection and the list of all buffers to show. The function must
-return a string representing the column's value."
+Functions for HEADER and MINIMUM-LENGTH are called with no arguments.
+FUN-OR-STRING gets as argument the buffer where we have started
+buffer selection and the list of all buffers to show. The function
+must return a string representing the column's value."
:group 'bs-appearance
:type '(repeat sexp))