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Add a function to load the layout tree from files

Louis Moureaux requested to merge feature/layout-tree-load into develop

Description

The tree is loaded from files in etc/gem/layout-tree.d. All files found under that directory are concatenated into a single YAML document, that is then turned into C++ objects with loader.

Concatenation was the only option to make YAML anchors work across multiple files. In theory, it could have been implemented using include statements like Gitlab does:

*include: file name

Unfortunately, yaml-cpp doesn't expose the relevant hooks.

See the documentation of load() for more details.

Related Issue

Fixes #97 (closed)

How Has This Been Tested?

  • All files are found correctly and symbolic links are resolved as needed
  • Files are concatenated correctly

If provided with some real data, I can add example files and a unit test.

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

  • My code follows the code style of this project.
  • My change requires a change to the documentation.
  • I have updated the documentation accordingly.
  • I have read the CONTRIBUTING document.
  • I have added tests to cover my changes.
  • All new and existing tests passed.

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