Saving settings for extensions
c.holtermann at gmx.de
Sat May 23 09:48:41 EDT 2015
thank you very much for your extensive answer. I'll work through
it and ask again. As I've said it's something I've been wondering
about for a while. For some python scripts I've used external
config files but I think it makes more sense to have config stored
in one place.
Am 23.05.2015 um 11:16 schrieb Geert Janssens:
> On Monday 11 May 2015 10:29:17 Christoph Holtermann wrote:
>> Dear developers,
>> I have been wondering for some while if it is possible
>> for extensions like in the python bindings to save settings
>> in the place gnucash does.
>> Christoph Holtermann
> Hi Christoph,
> That's a short question which requires a long answer.
> To start there are several places where gnucash stores settings
> depending on the scope of these settings.
> Settings that affect all the user's books are stored via the gsettings
> mechanism (which has different backends depending on the OS).
> Settings that are related to a book are stored in a file in
> .gnucash/books. These settings mostly save gui state so as such they may
> be of less interest.
> The gsettings interface is wrapped via the gnc_prefs api in gnucash. The
> gnc_prefs api is described here:
> Via this api it should be relatively easy to read or modify any setting
> that is defined in the gnucash code.
> And there's the catch. Only settings that are defined can easily be
> manipulated. That's a limitation of the underlying gsettings interface.
> Nothing however is stopping you from defining your own set of
> preferences in an extension written using the python bindings. It will
> likely be more complicated to write such an extension, mainly due to the
> way gsettings works.
> New preference options are defined as a "schema" in an xml file. You
> will find several such schema files in the gnucash source tree in the
> various gchemas directories (for example: src/gnome-utils/gschemas).
> This schema file then has to be compiled and installed in a place where
> the gsettings library can find it. If you don't want to or can't install
> the compiled schema in the system libraries, you can also install it in
> a non-standard location and set the XDG_DATA_DIRS environment variable
> properly so your schema file will be found. GnuCash uses this mechanism
> itself when it's configured to be installed in a directory other than
> the default (/usr/bin). An example can be found in
> $PREFIX/etc/gnucash/environment in such a case. Note that this file is
> not using shell script notation, so if you want to set the environment
> variable, you will have to transliterate the example (; -> : and adding
> $ signs for inclusion of other environment variables).
> So depending on the build system surrounding your python extension,
> wanting to use the gnc preferences system suddenly adds quite a bit of
> overhead. I have no idea if gsettings has some useful python bindings
> itself that may simplify this.
> The above is a rough overview only. If you need more details or
> specifics feel free to ask.
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