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+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#[=======================================================================[.rst:
+CSharpUtilities
+---------------
+
+Functions to make configuration of CSharp/.NET targets easier.
+
+A collection of CMake utility functions useful for dealing with CSharp
+targets for Visual Studio generators from version 2010 and later.
+
+The following functions are provided by this module:
+
+**Main functions**
+
+- :command:`csharp_set_windows_forms_properties`
+- :command:`csharp_set_designer_cs_properties`
+- :command:`csharp_set_xaml_cs_properties`
+
+**Helper functions**
+
+- :command:`csharp_get_filename_keys`
+- :command:`csharp_get_filename_key_base`
+- :command:`csharp_get_dependentupon_name`
+
+Main functions provided by the module
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. command:: csharp_set_windows_forms_properties
+
+  Sets source file properties for use of Windows Forms. Use this, if your CSharp
+  target uses Windows Forms::
+
+    csharp_set_windows_forms_properties([<file1> [<file2> [...]]])
+
+  ``<fileN>``
+    List of all source files which are relevant for setting the
+    :prop_sf:`VS_CSHARP_<tagname>` properties (including ``.cs``, ``.resx`` and
+    ``.Designer.cs`` extensions).
+
+  In the list of all given files for all files ending with ``.Designer.cs`` and
+  ``.resx`` is searched.  For every *designer* or *resource* file a file with the
+  same base name but only ``.cs`` as extension is searched.  If this is found, the
+  :prop_sf:`VS_CSHARP_<tagname>` properties are set as follows:
+
+  for the **.cs** file:
+   - VS_CSHARP_SubType "Form"
+
+  for the **.Designer.cs** file (if it exists):
+   - VS_CSHARP_DependentUpon <cs-filename>
+   - VS_CSHARP_DesignTime "" (delete tag if previously defined)
+   - VS_CSHARP_AutoGen ""(delete tag if previously defined)
+
+  for the **.resx** file (if it exists):
+   - VS_RESOURCE_GENERATOR "" (delete tag if previously defined)
+   - VS_CSHARP_DependentUpon <cs-filename>
+   - VS_CSHARP_SubType "Designer"
+
+.. command:: csharp_set_designer_cs_properties
+
+  Sets source file properties of ``.Designer.cs`` files depending on
+  sibling filenames. Use this, if your CSharp target does **not**
+  use Windows Forms (for Windows Forms use
+  :command:`csharp_set_designer_cs_properties` instead)::
+
+    csharp_set_designer_cs_properties([<file1> [<file2> [...]]])
+
+  ``<fileN>``
+    List of all source files which are relevant for setting the
+    :prop_sf:`VS_CSHARP_<tagname>` properties (including ``.cs``,
+    ``.resx``, ``.settings`` and ``.Designer.cs`` extensions).
+
+  In the list of all given files for all files ending with
+  ``.Designer.cs`` is searched. For every *designer* file all files
+  with the same base name but different extensions are searched. If
+  a match is found, the source file properties of the *designer* file
+  are set depending on the extension of the matched file:
+
+  if match is **.resx** file:
+   - VS_CSHARP_AutoGen "True"
+   - VS_CSHARP_DesignTime "True"
+   - VS_CSHARP_DependentUpon <resx-filename>
+
+  if match is **.cs** file:
+   - VS_CSHARP_DependentUpon <cs-filename>
+
+  if match is **.settings** file:
+   - VS_CSHARP_AutoGen "True"
+   - VS_CSHARP_DesignTimeSharedInput "True"
+   - VS_CSHARP_DependentUpon <settings-filename>
+
+.. note::
+
+    Because the source file properties of the ``.Designer.cs`` file are set according
+    to the found matches and every match sets the **VS_CSHARP_DependentUpon**
+    property, there should only be one match for each ``Designer.cs`` file.
+
+.. command:: csharp_set_xaml_cs_properties
+
+  Sets source file properties for use of Windows Presentation Foundation (WPF) and
+  XAML. Use this, if your CSharp target uses WPF/XAML::
+
+    csharp_set_xaml_cs_properties([<file1> [<file2> [...]]])
+
+  ``<fileN>``
+    List of all source files which are relevant for setting the
+    :prop_sf:`VS_CSHARP_<tagname>` properties (including ``.cs``,
+    ``.xaml``, and ``.xaml.cs`` extensions).
+
+  In the list of all given files for all files ending with
+  ``.xaml.cs`` is searched. For every *xaml-cs* file, a file
+  with the same base name but extension ``.xaml`` is searched.
+  If a match is found, the source file properties of the ``.xaml.cs``
+  file are set:
+
+   - VS_CSHARP_DependentUpon <xaml-filename>
+
+Helper functions which are used by the above ones
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. command:: csharp_get_filename_keys
+
+  Helper function which computes a list of key values to identify
+  source files independently of relative/absolute paths given in cmake
+  and eliminates case sensitivity::
+
+    csharp_get_filename_keys(OUT [<file1> [<file2> [...]]])
+
+  ``OUT``
+    Name of the variable in which the list of keys is stored
+
+  ``<fileN>``
+    filename(s) as given to to CSharp target using :command:`add_library`
+    or :command:`add_executable`
+
+  In some way the function applies a canonicalization to the source names.
+  This is necessary to find file matches if the files have been added to
+  the target with different directory prefixes:
+
+  .. code-block:: cmake
+
+    add_library(lib
+      myfile.cs
+      ${CMAKE_CURRENT_SOURCE_DIR}/myfile.Designer.cs)
+
+    set_source_files_properties(myfile.Designer.cs PROPERTIES
+      VS_CSHARP_DependentUpon myfile.cs)
+
+    # this will fail, because in cmake
+    #  - ${CMAKE_CURRENT_SOURCE_DIR}/myfile.Designer.cs
+    #  - myfile.Designer.cs
+    # are not the same source file. The source file property is not set.
+
+.. command:: csharp_get_filename_key_base
+
+  Returns the full filepath and name **without** extension of a key.
+  KEY is expected to be a key from csharp_get_filename_keys. In BASE
+  the value of KEY without the file extension is returned::
+
+    csharp_get_filename_key_base(BASE KEY)
+
+  ``BASE``
+    Name of the variable with the computed "base" of ``KEY``.
+
+  ``KEY``
+    The key of which the base will be computed. Expected to be a
+    upper case full filename.
+
+.. command:: csharp_get_dependentupon_name
+
+  Computes a string which can be used as value for the source file property
+  :prop_sf:`VS_CSHARP_<tagname>` with *target* being ``DependentUpon``::
+
+    csharp_get_dependentupon_name(NAME FILE)
+
+  ``NAME``
+    Name of the variable with the result value
+
+  ``FILE``
+    Filename to convert to ``<DependentUpon>`` value
+
+  Actually this is only the filename without any path given at the moment.
+
+#]=======================================================================]
+
+function(csharp_get_filename_keys OUT)
+  set(${OUT} "")
+  foreach(f ${ARGN})
+    get_filename_component(f ${f} REALPATH)
+    string(TOUPPER ${f} f)
+    list(APPEND ${OUT} ${f})
+  endforeach()
+  set(${OUT} "${${OUT}}" PARENT_SCOPE)
+endfunction()
+
+function(csharp_get_filename_key_base base key)
+  get_filename_component(dir ${key} DIRECTORY)
+  get_filename_component(fil ${key} NAME_WE)
+  set(${base} "${dir}/${fil}" PARENT_SCOPE)
+endfunction()
+
+function(csharp_get_dependentupon_name out in)
+  get_filename_component(${out} ${in} NAME)
+  set(${out} ${${out}} PARENT_SCOPE)
+endfunction()
+
+function(csharp_set_windows_forms_properties)
+  csharp_get_filename_keys(fileKeys ${ARGN})
+  foreach(key ${fileKeys})
+    get_filename_component(ext ${key} EXT)
+    if(${ext} STREQUAL ".DESIGNER.CS" OR
+       ${ext} STREQUAL ".RESX")
+      csharp_get_filename_key_base(NAME_BASE ${key})
+      list(FIND fileKeys "${NAME_BASE}.CS" FILE_INDEX)
+      if(NOT ${FILE_INDEX} EQUAL -1)
+        list(GET ARGN ${FILE_INDEX} FILE_NAME)
+        # set properties of main form file
+        set_source_files_properties("${FILE_NAME}"
+          PROPERTIES
+          VS_CSHARP_SubType "Form")
+        csharp_get_dependentupon_name(LINK "${FILE_NAME}")
+        # set properties of designer file (if found)
+        list(FIND fileKeys "${NAME_BASE}.DESIGNER.CS" FILE_INDEX)
+        if(NOT ${FILE_INDEX} EQUAL -1)
+          list(GET ARGN ${FILE_INDEX} FILE_NAME)
+          set_source_files_properties("${FILE_NAME}"
+            PROPERTIES
+            VS_CSHARP_DependentUpon "${LINK}"
+            VS_CSHARP_DesignTime ""
+            VS_CSHARP_AutoGen "")
+        endif()
+        # set properties of corresponding resource file (if found)
+        list(FIND fileKeys "${NAME_BASE}.RESX" FILE_INDEX)
+        if(NOT ${FILE_INDEX} EQUAL -1)
+          list(GET ARGN ${FILE_INDEX} FILE_NAME)
+          set_source_files_properties("${FILE_NAME}"
+            PROPERTIES
+            VS_RESOURCE_GENERATOR ""
+            VS_CSHARP_DependentUpon "${LINK}"
+            VS_CSHARP_SubType "Designer")
+        endif()
+      endif()
+    endif()
+  endforeach()
+endfunction()
+
+function(csharp_set_designer_cs_properties)
+  csharp_get_filename_keys(fileKeys ${ARGN})
+  set(INDEX -1)
+  foreach(key ${fileKeys})
+    math(EXPR INDEX "${INDEX}+1")
+    list(GET ARGN ${INDEX} source)
+    get_filename_component(ext ${key} EXT)
+    if(${ext} STREQUAL ".DESIGNER.CS")
+      csharp_get_filename_key_base(NAME_BASE ${key})
+      if("${NAME_BASE}.RESX" IN_LIST fileKeys)
+        list(FIND fileKeys "${NAME_BASE}.RESX" FILE_INDEX)
+        list(GET ARGN ${FILE_INDEX} FILE_NAME)
+        csharp_get_dependentupon_name(LINK "${FILE_NAME}")
+        set_source_files_properties("${source}"
+          PROPERTIES
+          VS_CSHARP_AutoGen "True"
+          VS_CSHARP_DesignTime "True"
+          VS_CSHARP_DependentUpon "${LINK}")
+      elseif("${NAME_BASE}.CS" IN_LIST fileKeys)
+        list(FIND fileKeys "${NAME_BASE}.CS" FILE_INDEX)
+        list(GET ARGN ${FILE_INDEX} FILE_NAME)
+        csharp_get_dependentupon_name(LINK "${FILE_NAME}")
+        set_source_files_properties("${source}"
+          PROPERTIES
+          VS_CSHARP_DependentUpon "${LINK}")
+      elseif("${NAME_BASE}.SETTINGS" IN_LIST fileKeys)
+        list(FIND fileKeys "${NAME_BASE}.SETTINGS" FILE_INDEX)
+        list(GET ARGN ${FILE_INDEX} FILE_NAME)
+        csharp_get_dependentupon_name(LINK "${FILE_NAME}")
+        set_source_files_properties("${source}"
+          PROPERTIES
+          VS_CSHARP_AutoGen "True"
+          VS_CSHARP_DesignTimeSharedInput "True"
+          VS_CSHARP_DependentUpon "${LINK}")
+      endif()
+    endif()
+  endforeach()
+endfunction()
+
+function(csharp_set_xaml_cs_properties)
+  csharp_get_filename_keys(fileKeys ${ARGN})
+  set(INDEX -1)
+  foreach(key ${fileKeys})
+    math(EXPR INDEX "${INDEX}+1")
+    list(GET ARGN ${INDEX} source)
+    get_filename_component(ext ${key} EXT)
+    if(${ext} STREQUAL ".XAML.CS")
+      csharp_get_filename_key_base(NAME_BASE ${key})
+      if("${NAME_BASE}.XAML" IN_LIST fileKeys)
+        list(FIND fileKeys "${NAME_BASE}.XAML" FILE_INDEX)
+        list(GET ARGN ${FILE_INDEX} FILE_NAME)
+        csharp_get_dependentupon_name(LINK "${FILE_NAME}")
+        set_source_files_properties("${source}"
+          PROPERTIES
+          VS_CSHARP_DependentUpon "${LINK}")
+      endif()
+    endif()
+  endforeach()
+endfunction()