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revision 1.14 by gerd, Wed Nov 3 13:39:34 1999 UTC revision 1.15 by rms, Tue Jul 30 18:56:52 2002 UTC
# Line 830  Pay rent Line 830  Pay rent
830  @noindent  @noindent
831  on the last Monday of every month.  on the last Monday of every month.
832    
833    The generality of sexp diary entries lets you specify any diary entry    The generality of sexp diary entries lets you specify any diary
834  that you can describe algorithmically.  A sexp diary entry contains an  entry that you can describe algorithmically.  A sexp diary entry
835  expression that computes whether the entry applies to any given date.  contains an expression that computes whether the entry applies to any
836  If its value is non-@code{nil}, the entry applies to that date;  given date.  If its value is non-@code{nil}, the entry applies to that
837  otherwise, it does not.  The expression can use the variable  @code{date}  date; otherwise, it does not.  The expression can use the variable
838  to find the date being considered; its value is a list (@var{month}  @code{date} to find the date being considered; its value is a list
839  @var{day} @var{year}) that refers to the Gregorian calendar.  (@var{month} @var{day} @var{year}) that refers to the Gregorian
840    calendar.
841    
842      The sexp diary entry applies to a date when the expression's value
843    is non-@code{nil}, but some values have more specific meanings.  If
844    the value is a string, that string is a description of the event which
845    occurs on that date.  The value can also have the form
846    @code{(@var{mark} . @var{string})}; then @var{mark} specifies how to
847    mark the date in the calendar, and @var{string} is the description of
848    the event.  If @var{mark} is a single-character string, that character
849    appears next to the date in the calendar.  If @var{mark} is a face
850    name, the date is displayed in that face.  If @var{mark} is
851    @code{nil}, that specifies no particular highlighting for the date.
852    
853    Suppose you get paid on the 21st of the month if it is a weekday, and    Suppose you get paid on the 21st of the month if it is a weekday, and
854  on the Friday before if the 21st is on a weekend.  Here is how to write  on the Friday before if the 21st is on a weekend.  Here is how to write
# Line 933  the European style, the order of the par Line 945  the European style, the order of the par
945  @var{month}, @var{year}.)  @var{month}, @var{year}.)
946  @end table  @end table
947    
948      All the functions documented above take an optional argument
949    @var{mark} which specifies how to mark the date in the calendar display.
950    If one of these functions decides that it applies to a certain date,
951    it returns a value that contains @var{mark}.
952    
953  @node Appt Customizing  @node Appt Customizing
954  @section Customizing Appointment Reminders  @section Customizing Appointment Reminders
955    

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