RFC: quantmod::getSymbols.MySQL

Hi Josh,

As you probably noticed, I updated getSymbols.FI() to use options a
couple weeks ago, but instead of using a single option that is a list,
I made a separate option for each function argument.  This allows two
things:  1) you can have different default values set for the "from"
argument (for example) of different getSymbols.*() methods. 2) It
doesn't change the old defaults.  i.e. getOption("someOption",
"2014-01-01") will return the value of the option if it is set, or
"2014-01-01" if not.

With your list structure, the default value has to be determined
inside the function, I suppose.

Here's the formal argument list for getSymbols.FI

args(getSymbols.FI)

function (Symbols, from = getOption("getSymbols.FI.from", "2010-01-01"),
    to = getOption("getSymbols.FI.to", Sys.Date()), ..., dir =
getOption("getSymbols.FI.dir",
        ""), return.class = getOption("getSymbols.FI.return.class",
        "xts"), extension = getOption("getSymbols.FI.extension",
        "rda"), split_method = getOption("getSymbols.FI.split_method",
        c("days", "common")), use_identifier =
getOption("getSymbols.FI.use_identifier",
        NA), date_format = getOption("getSymbols.FI.date_format"),
    verbose = getOption("getSymbols.FI.verbose", TRUE), days_to_omit =
getOption("getSymbols.FI.days_to_omit",
        c("Saturday", "Sunday")), indexTZ = getOption("getSymbols.FI.indexTZ",
        NA))


Garrett

As many of you know, the Defaults package was removed from CRAN on
2014-10-03 at Jeff's request.  This broke a fair bit of functionality
in quantmod, most of which I have addressed in recent commits on
R-Forge.

One issue I have not resolved is how to adapt getSymbols.MySQL to the
new no-Defaults paradigm.  I will be taking over as maintainer of
quantmod, so I am soliciting input from getSymbols.MySQL users.

My proposed solution to getSymbols.MySQL is to look for specific
option()s if certain arguments are missing.  I think this is the
cleanest and most obvious solution, but am open to alternatives.  I
would use the option structure below, with only the three arguments
listed.

options(quantmod.defaults = list(
  getSymbols.MySQL = list(
    user="josh",
    password="secret",
    dbname="stocks")
  )
)

Should I consider another option structure?  Should additional
arguments be supported?  Anything else I'm missing?

Thanks,
--
Joshua Ulrich  |  about.me/joshuaulrich
FOSS Trading  |  www.fosstrading.com

_______________________________________________
R-SIG-Finance at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-sig-finance
-- Subscriber-posting only. If you want to post, subscribe first.
-- Also note that this is not the r-help list where general R questions should go.