Help: Avoid duplicating registry query syntax in multiple find_* commands

In commit 8d7e80cf3d (find_* commands: add control over Windows registry
views, 2022-04-16) we added documentation that is repeated by multiple
find commands.  Move it to a dedicated manual section to avoid duplication.

4 files changed, 68 insertions, 51 deletions

diff --git a/Help/command/FIND_XXX.txt b/Help/command/FIND_XXX.txt
index ab5f860..6683edb 100644
--- a/Help/command/FIND_XXX.txt
+++ b/Help/command/FIND_XXX.txt
@@ -54,10 +54,8 @@ Options include:
 
   .. versionchanged:: 3.24
     On ``Windows`` platform, it is possible to include registry queries as part
-    of the directories. Such specifications will be ignored on all other
-    platforms.
-
-  .. include:: FIND_XXX_REGISTRY_QUERY.txt
+    of the directories, using a :ref:`dedicated syntax <Find Using Windows Registry>`.
+    Such specifications will be ignored on all other platforms.
 
 ``REGISTRY_VIEW``
   .. versionadded:: 3.24
diff --git a/Help/command/FIND_XXX_REGISTRY_QUERY.txt b/Help/command/FIND_XXX_REGISTRY_QUERY.txt
deleted file mode 100644
index 04a087a..0000000
--- a/Help/command/FIND_XXX_REGISTRY_QUERY.txt
+++ /dev/null
@@ -1,43 +0,0 @@
-The formal syntax, as specified using
-`BNF <https://en.wikipedia.org/wiki/Backus%E2%80%93Naur_form>`_ notation with
-the regular extensions, for registry query is the following:
-
-.. parsed-literal::
-
-  registry_query  ::= '[' `sep_definition`_? `root_key`_
-                      ((`key_separator`_ `sub_key`_)? (`value_separator`_ `value_name`_)?)? ']'
-  _`sep_definition`  ::= '{' `value_separator`_ '}'
-  _`root_key`        ::= 'HKLM' | 'HKEY_LOCAL_MACHINE' | 'HKCU' | 'HKEY_CURRENT_USER' |
-                      'HKCR' | 'HKEY_CLASSES_ROOT' | 'HKCC' | 'HKEY_CURRENT_CONFIG' |
-                      'HKU' | 'HKEY_USERS'
-  _`sub_key`         ::= `element`_ (`key_separator`_ `element`_)*
-  _`key_separator`   ::= '/' | '\\'
-  _`value_separator` ::= `element`_ | ';'
-  _`value_name`      ::= `element`_ | '(default)'
-  _`element`         ::= `character`_\+
-  _`character`       ::= <any character except `key_separator`_ and `value_separator`_>
-
-The `sep_definition`_ optional item offers the possibility to specify the
-string used to separate the `sub_key`_ from the `value_name`_ item. If
-not specified, the character ``;`` is used.
-
-.. parsed-literal::
-
-  # example using default separator
-  |FIND_XXX| (... **PATHS** "/root/[HKLM/Stuff;InstallDir]/lib[HKLM\\\\Stuff;Architecture]")
-
-  # example using different specified separators
-  |FIND_XXX| (... **HINTS** "/root/[{|}HKCU/Stuff|InstallDir]/lib[{@@}HKCU\\\\Stuff@@Architecture]")
-
-If the `value_name`_ item is not specified or has the special name
-``(default)``, the content of the default value, if any, will be returned. The
-supported types for the `value_name`_ are:
-
-* ``REG_SZ``.
-* ``REG_EXPAND_SZ``. The returned data is expanded.
-* ``REG_DWORD``.
-* ``REG_QWORD``.
-
-When the registry query failed, typically because the key does not exist or
-the data type is not supported, the string ``/REGISTRY-NOTFOUND`` is substituted
-to the ``[]`` query expression.
diff --git a/Help/command/find_package.rst b/Help/command/find_package.rst
index 8ce6529..a7d7d00 100644
--- a/Help/command/find_package.rst
+++ b/Help/command/find_package.rst
@@ -309,10 +309,9 @@ that order).
 
 .. versionchanged:: 3.24
   On ``Windows`` platform, it is possible to include registry queries as part
-  of the directories specified through ``HINTS`` and ``PATHS`` keywords. Such
-  specifications will be ignored on all other platforms.
-
-.. include:: FIND_XXX_REGISTRY_QUERY.txt
+  of the directories specified through ``HINTS`` and ``PATHS`` keywords, using
+  a :ref:`dedicated syntax <Find Using Windows Registry>`. Such specifications
+  will be ignored on all other platforms.
 
 .. versionadded:: 3.24
   ``REGISTRY_VIEW`` can be specified to manage ``Windows`` registry queries
diff --git a/Help/manual/cmake-developer.7.rst b/Help/manual/cmake-developer.7.rst
index fe146de..2c6cd96 100644
--- a/Help/manual/cmake-developer.7.rst
+++ b/Help/manual/cmake-developer.7.rst
@@ -242,6 +242,69 @@ backwards compatibility for any old names that were actually in use.
 Make sure you comment them as deprecated, so that no-one starts using
 them.
 
+.. _`Find Using Windows Registry`:
+
+Find Using Windows Registry
+---------------------------
+
+.. versionchanged:: 3.24
+
+Options ``HINTS`` and ``PATHS`` of :command:`find_file`,
+:command:`find_library`, :command:`find_path`, :command:`find_program`, and
+:command:`find_package` commands offer the possibility, on ``Windows``
+platform, to query the registry.
+
+The formal syntax, as specified using
+`BNF <https://en.wikipedia.org/wiki/Backus%E2%80%93Naur_form>`_ notation with
+the regular extensions, for registry query is the following:
+
+.. raw:: latex
+
+   \begin{small}
+
+.. productionlist::
+  registry_query: '[' `sep_definition`? `root_key`
+                :     ((`key_separator` `sub_key`)? (`value_separator` `value_name`_)?)? ']'
+  sep_definition: '{' `value_separator` '}'
+  root_key: 'HKLM' | 'HKEY_LOCAL_MACHINE' | 'HKCU' | 'HKEY_CURRENT_USER' |
+          : 'HKCR' | 'HKEY_CLASSES_ROOT' | 'HKCC' | 'HKEY_CURRENT_CONFIG' |
+          : 'HKU' | 'HKEY_USERS'
+  sub_key: `element` (`key_separator` `element`)*
+  key_separator: '/' | '\\'
+  value_separator: `element` | ';'
+  value_name: `element` | '(default)'
+  element: `character`\+
+  character: <any character except `key_separator` and `value_separator`>
+
+.. raw:: latex
+
+   \end{small}
+
+The :token:`sep_definition` optional item offers the possibility to specify
+the string used to separate the :token:`sub_key` from the :token:`value_name`
+item. If not specified, the character ``;`` is used. Multiple
+:token:`registry_query` items can be specified as part of a path.
+
+.. code-block:: cmake
+
+  # example using default separator
+  find_file(... PATHS "/root/[HKLM/Stuff;InstallDir]/lib[HKLM\\\\Stuff;Architecture]")
+
+  # example using different specified separators
+  find_library(... HINTS "/root/[{|}HKCU/Stuff|InstallDir]/lib[{@@}HKCU\\\\Stuff@@Architecture]")
+
+If the :token:`value_name` item is not specified or has the special name
+``(default)``, the content of the default value, if any, will be returned. The
+supported types for the :token:`value_name` are:
+
+* ``REG_SZ``.
+* ``REG_EXPAND_SZ``. The returned data is expanded.
+* ``REG_DWORD``.
+* ``REG_QWORD``.
+
+When the registry query failed, typically because the key does not exist or
+the data type is not supported, the string ``/REGISTRY-NOTFOUND`` is substituted
+to the ``[]`` query expression.
 
 A Sample Find Module
 --------------------