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source_group
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------------
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Define a grouping for source files in IDE project generation.
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There are two different signatures to create source groups.
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.. code-block:: cmake
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source_group(<name> [FILES <src>...] [REGULAR_EXPRESSION <regex>])
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source_group(TREE <root> [PREFIX <prefix>] [FILES <src>...])
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Defines a group into which sources will be placed in project files.
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This is intended to set up file tabs in Visual Studio.
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The group is scoped in the directory where the command is called,
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and applies to sources in targets created in that directory.
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The options are:
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``TREE``
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.. versionadded:: 3.8
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CMake will automatically detect, from ``<src>`` files paths, source groups
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it needs to create, to keep structure of source groups analogically to the
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actual files and directories structure in the project. Paths of ``<src>``
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files will be cut to be relative to ``<root>``.
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``PREFIX``
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.. versionadded:: 3.8
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Source group and files located directly in ``<root>`` path, will be placed
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in ``<prefix>`` source groups.
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``FILES``
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Any source file specified explicitly will be placed in group
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``<name>``. Relative paths are interpreted with respect to the
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current source directory.
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``REGULAR_EXPRESSION``
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Any source file whose name matches the regular expression will
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be placed in group ``<name>``.
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If a source file matches multiple groups, the *last* group that
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explicitly lists the file with ``FILES`` will be favored, if any.
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If no group explicitly lists the file, the *last* group whose
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regular expression matches the file will be favored.
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The ``<name>`` of the group and ``<prefix>`` argument may contain forward
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slashes or backslashes to specify subgroups. Backslashes need to be escaped
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appropriately:
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.. code-block:: cmake
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source_group(base/subdir ...)
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source_group(outer\\inner ...)
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source_group(TREE <root> PREFIX sources\\inc ...)
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.. versionadded:: 3.18
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Allow using forward slashes (``/``) to specify subgroups.
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For backwards compatibility, the short-hand signature
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.. code-block:: cmake
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source_group(<name> <regex>)
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is equivalent to
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.. code-block:: cmake
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source_group(<name> REGULAR_EXPRESSION <regex>)
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