FindDocBookXSL.cmake: Add

Taken from
<https://github.com/KDE/kdoctools/blob/master/cmake/FindDocBookXSL.cmake>

Signed-off-by: Simon McVittie <smcv@collabora.com>
Resolves: https://gitlab.freedesktop.org/dbus/dbus/issues/237

diff --git a/cmake/modules/FindDocBookXSL.cmake b/cmake/modules/FindDocBookXSL.cmake
new file mode 100644 (file)
index 0000000..3d9e40c
--- /dev/null
+++ b/cmake/modules/FindDocBookXSL.cmake
@@ -0,0 +1,84 @@
+# Try to find DocBook XSL stylesheet
+# Once done, it will define:
+#
+#  DocBookXSL_FOUND - system has the required DocBook XML DTDs
+#  DocBookXSL_DIR - the directory containing the stylesheets
+#  used to process DocBook XML
+
+# Copyright (c) 2010, Luigi Toscano, <luigi.toscano@tiscali.it>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+# 3. Neither the name of the University nor the names of its contributors
+#    may be used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+
+include(FeatureSummary)
+set_package_properties(DocBookXSL PROPERTIES DESCRIPTION "DocBook XSL"
+                       URL "http://docbook.sourceforge.net/release/xsl/current/"
+                      )
+
+set (STYLESHEET_PATH_LIST
+    ${CMAKE_INSTALL_DATAROOTDIR}/xml/docbook/stylesheet/docbook-xsl
+    ${CMAKE_INSTALL_DATAROOTDIR}/xml/docbook/xsl-stylesheets
+    ${CMAKE_INSTALL_DATAROOTDIR}/sgml/docbook/xsl-stylesheets
+    ${CMAKE_INSTALL_DATAROOTDIR}/xml/docbook/stylesheet/nwalsh/current
+    ${CMAKE_INSTALL_DATAROOTDIR}/xml/docbook/stylesheet/nwalsh
+    ${CMAKE_INSTALL_DATAROOTDIR}/xsl/docbook
+    ${CMAKE_INSTALL_DATAROOTDIR}/xsl/docbook-xsl
+    #for building on Mac with docbook-xsl installed by homebrew
+    opt/docbook-xsl/docbook-xsl
+)
+
+find_path (DocBookXSL_DIR lib/lib.xsl
+    PATHS ${CMAKE_SYSTEM_PREFIX_PATH}
+    PATH_SUFFIXES ${STYLESHEET_PATH_LIST}
+)
+
+if (NOT DocBookXSL_DIR)
+    # hacks for systems that put the version in the stylesheet dirs
+    set (STYLESHEET_PATH_LIST)
+    foreach (STYLESHEET_PREFIX_ITER ${CMAKE_SYSTEM_PREFIX_PATH})
+        file(GLOB STYLESHEET_SUFFIX_ITER RELATIVE ${STYLESHEET_PREFIX_ITER}
+            ${STYLESHEET_PREFIX_ITER}/share/xml/docbook/xsl-stylesheets-*
+        )
+        if (STYLESHEET_SUFFIX_ITER)
+            list (APPEND STYLESHEET_PATH_LIST ${STYLESHEET_SUFFIX_ITER})
+        endif ()
+    endforeach ()
+
+    find_path (DocBookXSL_DIR VERSION
+        PATHS ${CMAKE_SYSTEM_PREFIX_PATH}
+        PATH_SUFFIXES ${STYLESHEET_PATH_LIST}
+    )
+endif ()
+
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args (DocBookXSL
+    REQUIRED_VARS DocBookXSL_DIR
+    FOUND_VAR DocBookXSL_FOUND)
+
+#maintain backwards compatibility
+set(DOCBOOKXSL_FOUND ${DocBookXSL_FOUND})
+set(DOCBOOKXSL_DIR ${DocBookXSL_DIR})
+
+mark_as_advanced (DocBookXSL_DIR)