gnc-fq-helper  -  allows gnucash to communicate with Finance::Quote
                     over pipes from guile. The requests and responses
                     are scheme forms.




   Input: (on standard input - one entry per line and one line per entry,
   and double quotes must only be delimiters, not string content --
   remember, we don't have a real scheme parser on the perl side :>).

   (<method-name> symbol symbol symbol ...)

   where <method-name> indicates the desired Finance::Quote method.  The
   currently recognized subset is yahoo, yahoo_europe, fidelity_direct,
   troweprice_direct, vanguard, asx, tiaacref, and currency.

   For currency quotes, the symbols alternate between the 'from' and 'to'

   For example:

   (yahoo "IBM" "LNUX") (fidelity_direct "FBIOX" "FSELX") (currency "USD"

   Output (on standard output, one output form per input line):

   Schemified version of gnc-fq's output, basically an alist of alists, as
   in the example below.  Right now, only the fields that this script
   knows about (and knows how to convert to scheme) are returned, so the
   conversion function will have to be updated whenever Finance::Quote
   changes.  Currently you'll get symbol, gnc:time-no-zone, and currency,
   and either last, nav, or price.  Fields with gnc: prefixes are
   non-Finance::Quote fields.  gnc:time-no-zone is returned as a string of
   the form "YYYY-MM-DD HH:MM:SS", basically the unmolested (and
   underspecified) output of the quote source.  It's up to you to know
   what it's proper timezone really is.  i.e. if you know the time was in
   America/Chicago, you'll need to convert it to that.

   For example:

    $ echo '(yahoo "CSCO" "JDSU" "^IXIC")' | ./gnc-fq-helper
   (("CSCO" (symbol . "CSCO")
            (gnc:time-no-zone . "2001-03-13 19:27:00")
            (last . 20.375)
            (currency . "USD"))
    ("JDSU" (symbol . "JDSU")
            (gnc:time-no-zone . "2001-03-13 19:27:00")
            (last . 23.5625)
            (currency . "USD"))
   ("^IXIC" (symbol . ^IXIC)
            (gnc:time-no-zone . 2002-12-04 17:16:00)
            (last . 1430.35)
            (currency . failed-conversion)))

   On error, the overall result may be #f, or on individual errors, the
   list sub-item for a given symbol may be #f, like this:

    $ echo '(yahoo "CSCO" "JDSU")' | ./gnc-fq-helper
    ("JDSU" (symbol . "JDSU")
            (gnc:time-no-zone . "2001-03-13 19:27:00")
            (last . 23.5625)
            (currency . "USD")))

   further, errors may be stored with each quote as indicated in
   Finance::Quote, and whenever the conversion to scheme data fails, the
   field will have the value 'failed-conversion, and accordingly this
   symbol will never be a legitimate conversion.

   Exit status

   0 - success non-zero - failure


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