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ENH: rename txx files to hxx

Manuel Grizonnet requested to merge txx_to_hxx into develop

OTB followed since the beginning the ITK convention and use .txx extension for all template classes. Nevertheless, some development tools do not recognize .txx file extension. Other tool like GitHub can't do in-browser syntax highlighting for txx files I think.

The root problem is the use of the txx which should be changed to hxx (or hpp).

In 2011, after an in-depth discussion near April 20, 2011 on the Insight-Developers mailing list, ITK rename all txx files to hxx (and event prevent the push of .txx files with a pre-commit hook). It happens is major release v4.

You can find some arguments in the discussion about the change and also in other projects related to ITK which applied the same modification, see for instance VXL:

This commit apply now the same modification for OTB.

I understand that it will change some habit for developers and don't bring new features but I think that in general it is better to stay align with ITK guidelines.

In my opinion, it always facilitate the use of OTB and ITK together if we share when we can the same code architecture, directory organization, naming conventions...

What I've done:

find . -name "*.txx" -not -path "./.git/*" -exec rename 's/\.txx$/.hxx/' '{}' \;
find . -type f -not -path "./.git/*" | xargs perl -pi -e 's/txx/hxx/g'
find . -type f -not -path "./.git/*" | xargs perl -pi -e 's/TXX/HXX/g'
git checkout -- Documentation/Cookbook/Art/*
Edited by Victor Poughon

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