Switch to using my FindQtDocs cmake module

.github/workflows/docs.yaml

@@ -23,7 +23,7 @@ jobs:
         "$RUNNER_TEMP/doxygen-${DOXYGEN_VERSION}/bin/doxygen" --version
     - name: Build docs
       run: |
-        cmake -D "DOXYGEN_EXECUTABLE=$RUNNER_TEMP/doxygen-${DOXYGEN_VERSION}/bin/doxygen" -D "QT_TAGFILES_PATH=/usr/share/qt5/doc" -S "$GITHUB_WORKSPACE" -B "$RUNNER_TEMP"
+        cmake -D "DOXYGEN_EXECUTABLE=$RUNNER_TEMP/doxygen-${DOXYGEN_VERSION}/bin/doxygen" -S "$GITHUB_WORKSPACE" -B "$RUNNER_TEMP"
         cmake --build "$RUNNER_TEMP" --target doc doc-internal
     - name: Upload public docs
       uses: actions/upload-artifact@v4

doc/CMakeLists.txt

@@ -1,45 +1,19 @@
 # SPDX-FileCopyrightText: 2022-2024 Paul Colby <[email protected]>
 # SPDX-License-Identifier: LGPL-3.0-or-later
 
-# Attempt to detect the QT_INSTALL_DOCS path via qtpaths or qmake.
-if(NOT QT_INSTALL_DOCS)
-  if(QT_VERSION VERSION_GREATER_EQUAL 6.2.0 AND TARGET Qt${QT_VERSION_MAJOR}::qtpaths)
-    message(DEBUG "Fetching location of imported Qt${QT_VERSION_MAJOR}::qtpaths command")
-    get_target_property(COMMAND Qt${QT_VERSION_MAJOR}::qtpaths LOCATION)
-  elseif(TARGET Qt${QT_VERSION_MAJOR}::qmake)
-    message(DEBUG "Fetching location of imported Qt${QT_VERSION_MAJOR}::qmake command")
-    get_target_property(COMMAND Qt${QT_VERSION_MAJOR}::qmake LOCATION)
-  else()
-    message(STATUS "Neither Qt${QT_VERSION_MAJOR}::qtpaths nor Qt${QT_VERSION_MAJOR}::qmake available")
-  endif()
-  if (COMMAND)
-    message(VERBOSE "Fetching QT_INSTALL_DOCS from ${COMMAND}")
-    execute_process(
-      COMMAND "${COMMAND}" -query QT_INSTALL_DOCS
-      RESULT_VARIABLE COMMAND_RESULT
-      OUTPUT_VARIABLE COMMAND_OUTPUT
-      ERROR_VARIABLE COMMNAD_ERROR
-      OUTPUT_STRIP_TRAILING_WHITESPACE
-      ERROR_STRIP_TRAILING_WHITESPACE)
-    message(DEBUG "${COMMAND} result: ${COMMAND_RESULT}")
-    message(DEBUG "${COMMAND} output: ${COMMAND_OUTPUT}")
-    message(DEBUG "${COMMAND} error: ${COMMAND_ERROR}")
-    if(COMMAND_RESULT EQUAL 0)
-      set(QT_INSTALL_DOCS "${COMMAND_OUTPUT}")
-      message(STATUS "Found QT_INSTALL_DOCS: ${QT_INSTALL_DOCS}")
-    else()
-      message(STATUS "Failed to find QT_INSTALL_DOCS: ${COMMAND_OUTPUT} ${COMMAND_ERROR} [${COMMAND_RESULT}]")
-    endif()
-  endif()
-endif()
+include(FetchContent)
+FetchContent_Declare(FindQtDocs GIT_REPOSITORY "https://github.com/pcolby/cmake-modules" GIT_TAG "v1")
+FetchContent_MakeAvailable(FindQtDocs)
+list(PREPEND CMAKE_MODULE_PATH "${findqtdocs_SOURCE_DIR}")
+find_package(QtDocs REQUIRED COMPONENTS Core Bluetooth)
 
 # Include Qt doc tagfiles, if available.
-if (QT_INSTALL_DOCS)
+if (QtDocs_FOUND)
   set(QT_DOCS_BASEURL "https://doc.qt.io/qt-${QT_VERSION_MAJOR}/")
-  message(STATUS "Using Qt doc tagfiles ${QT_INSTALL_DOCS} (${QT_DOCS_BASEURL})")
+  message(STATUS "Using Qt doc tagfiles ${QT_INSTALL_DOCS} => ${QT_DOCS_BASEURL}")
   set(DOX_TAGFILES "\\
-  \"${QT_INSTALL_DOCS}/qtcore/qtcore.tags=${QT_DOCS_BASEURL}\" \\
-  \"${QT_INSTALL_DOCS}/qtbluetooth/qtbluetooth.tags=${QT_DOCS_BASEURL}\" \\")
+  \"${QtDocs_Core_TAGS}=${QT_DOCS_BASEURL}\" \\
+  \"${QtDocs_Bluetooth_TAGS}=${QT_DOCS_BASEURL}\" \\")
 endif()
 
 find_package(Doxygen)