Dave,
I am at a computer now so I can give a more reasonable answer than before.
The day-diff macro takes the date split up into year month and day input
separately, it can't take a YYYYMMDD string like you are describing. You
can try to split them up using a sequence of filters, but I think that just
replacing the code in the macro with yours is going to be simpler and give
you exactly what you want.
Anyway, the tables show the input parameters for each of the macros, so
year1 is the starting year and year2 is the ending year, it gives
year1-year2 in the output. The day and month inputs are the same with day1
and month1 being the start and day2 and month2 the end.
Modifying the macro to work with your function is less difficult than it
probably seems, but it took a lot of trial and error for me to figure that
out. To keep you from having to spend so much time on it here is how you
could modify the day-diff.js tiddler to work with your code, or with any
other javascript macro:
1. Change the second line so that the title is something else, otherwise it
will overwrite the same tiddler and probably cause confusion if you share
it.
2. Change the description, if your macro is going to do something
different, at the moment the description is the part that says 'Takes two
dates and returns their difference in days', it can be as long as you want
it to be but it must have the emptyline above it. I am not certain it needs
the empty line below but it may.
3. Change the line exports.name = "day-diff"; so that day-diff is whatever
name you want to give the macro, this is what you use the call the macro
either as <<day-diff.... or in <$macro-call $name=day-diff....
4. Change the export.params = [...] so that the array is an array of
objects, one per input to your function, in the same format as they already
are, ie {name: parameterName}
5. Change the exports.run = function ... so that the function is your
function. It should have the same inputs as listed in the export.params
array lists.
The javascript in the macro can be as complex as you want, and you can
define multiple functions, the one that is listed in the exports.run line
is the one that gets run.
The function should return a string that is whatever you need the result of
the macro to be.
As a warning, while you can make the macro change the state of the wiki by
changing values in tiddler fields it is generally not a good idea. A macro
gets evaluated every time it is rendered and if evaluating the macro
changes a widget or tiddler that causes the macro call to be re-rendered
you end up with an infinite loop or other unexpected behaviour.
And to answer your other question about the parameter names, they are
whatever you give in the exports.params array. So you have <$macro-call
$name=day-diff year1=1098 year2=2012/> or <<day-diff year1:1098 year2:2012>>
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