[Chandler-dev] Localization loading discussion

[John Anderson]

Here was pje's reply to the meeting notes about translations where we 
discussed two simple implementations which solve the problem of how to 
find translations before the repository is open.

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To: 	John Anderson <john at osafoundation.org>, OSAF Development 
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From: 	Phillip J. Eby <pje at telecommunity.com>
Subject: 	Re: [Chandler-dev] Meeting Notes: A meeting on python eggs and 
how they are used in Chandler (with an application to i18n issues)
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At 08:06 AM 5/31/2006 -0700, John Anderson wrote:
>We explored various implementation approaches, most notably the following two:
>
>As the Python eggs are discovered during Chandler launch, those that 
>contain mo files that have not been copied to the mo installation 
>directory will be copied.  So that after Chandler has been started once 
>all the mo files are installed. In the long run, when the repository is 
>built as part of the build process, our customer would never incur the 
>overhead of the step, unless they installed new language eggs, and then 
>only once.
>
>The second approach is very similar, except that rather than copying files 
>to an installation directory, a dictionary is setup in the repository 
>during parcel installation that maps locale to a list of paths to each mo 
>file the eggs or some other convenient data structure for runtime lookups.
>
>The first approach has the advantage of potentially working with Python 
>projects other than Chandler and the gettext mechanism is designed to work 
>with mo files stored in a directory.  It has the disadvantage of storing 
>two copies of the translation files, and when used by developers who 
>regularly create their repository from scratch the translation files might 
>not be available before the first string needs to be localized.

Note that that would only occur if the translation files were deleted along 
with the repository (which we could simply not do), or on the very first 
installation.  So it's not likely to be a significant disadvantage.


>The second approach has the advantage of being simpler to implement since 
>we can use the existing parcel install mechanism instead of building a 
>similar mechanism for eggs.

Actually, both approaches would use an identical API for the developer; 
whether that API copies the files or registers them in the repository is 
purely an implementation detail.  In both cases, the installParcel() hook 
provides an opportunity to invoke the API to register (or copy) the resources.

We could actually use one approach initially, and then decide to switch to 
a different one later, and nobody's code would change.

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