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                ??碼云GVP開源項目 12k star Uniapp+ElementUI 功能強大 支持多語言、二開方便! 廣告
                # 12.3 結合Doxygen和Sphinx **NOTE**:*此示例代碼可以在 https://github.com/dev-cafe/cmake-cookbook/tree/v1.0/chapter-12/recipe-03 中找到,其中包含一個C++示例。該示例在CMake 3.5版(或更高版本)中是有效的,并且已經在GNU/Linux、macOS和Windows上進行過測試。* 我們有一個C++項目,因此Doxygen是生成源代碼文檔的理想選擇。然而,我們也希望發布面向用戶的文檔,例如:介紹設計選擇。所以我們想使用Sphinx,因為生成的HTML也可以在移動設備上查看,而且可以部署文檔進行在線閱讀(https://readthedocs.org )。本教程將演示如何使用Breathe插件(https://breathe.readthedocs.io )組合Doxygen和Sphinx。 ## 準備工作 這個示例的目錄結構,類似于之前的兩個示例: ```shell . ├── cmake │ ├── FindPythonModule.cmake │ ├── FindSphinx.cmake │ └── UseBreathe.cmake ├── CMakeLists.txt ├── docs │ ├── code-reference │ │ ├── classes-and-functions.rst │ │ └── message.rst │ ├── conf.py.in │ ├── Doxyfile.in │ └── index.rst └── src ├── CMakeLists.txt ├── hello-world.cpp ├── Message.cpp └── Message.hpp ``` `docs`子目錄現在同時包含一個` Doxyfile.in`和一個`conf.py.in`模板文件。模板文件中,分別設置了Doxygen和Sphinx。此外,還有一個`code-referenc`子目錄。 `code-referenc`子目錄中的文件包含Breathe指令,用來在Sphinx中包含doxygen生成的文檔: ```txt Messaging classes ================= Message ------- .. doxygenclass:: Message :project: recipe-03 :members: :protected-members: :private-members: ``` 這將輸出Message類的文檔。 ## 具體實施 `src`目錄中的`CMakeLists.txt`文件沒有改變。主`CMakeLists.txt`文件中有修改: 1. 包含` UseBreathe.cmake`自定義模塊: ```cmake list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake") include(UseBreathe) ``` 2. 調用`add_breathe_doc`函數,這個函數是在自定義模塊中定義的,它接受關鍵字參數,來設置Doxygen和Sphinx: ```cmake add_breathe_doc( SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/docs BUILD_DIR ${CMAKE_CURRENT_BINARY_DIR}/_build CACHE_DIR ${CMAKE_CURRENT_BINARY_DIR}/_doctrees HTML_DIR ${CMAKE_CURRENT_BINARY_DIR}/html DOXY_FILE ${CMAKE_CURRENT_SOURCE_DIR}/docs/Doxyfile.in CONF_FILE ${CMAKE_CURRENT_SOURCE_DIR}/docs/conf.py.in TARGET_NAME docs COMMENT "HTML documentation" ) ``` 讓我們看一下`UseBreatheDoc.cmake`模塊,其遵循了與我們在前兩個示例中描述的顯式模式。具體描述如下: 1. 文檔生成依賴于Doxygen: ```cmake find_package(Doxygen REQUIRED) find_package(Perl REQUIRED) ``` 2. 還依賴于Python解釋器和Sphinx: ```cmake find_package(PythonInterp REQUIRED) find_package(Sphinx REQUIRED) ``` 3. 此外,還必須找到breathe的Python模塊。這里,我們使用`FindPythonModule.cmake`模塊: ```cmake include(FindPythonModule) find_python_module(breathe REQUIRED) ``` 4. 定義了`add_breathe_doc`函數,這個函數有一個單值關鍵字參數,我們將使用`cmake_parse_arguments`命令解析它: ```cmake function(add_breathe_doc) set(options) set(oneValueArgs SOURCE_DIR BUILD_DIR CACHE_DIR HTML_DIR DOXY_FILE CONF_FILE TARGET_NAME COMMENT ) set(multiValueArgs) cmake_parse_arguments(BREATHE_DOC "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN} ) # ... endfunction() ``` 5. `BREATHE_DOC_CONF_FILE`中的Sphinx模板文件,會通過`conf.py`配置到的`BREATHE_DOC_BUILD_DIR`目錄下: ```cmake configure_file( ${BREATHE_DOC_CONF_FILE} ${BREATHE_DOC_BUILD_DIR}/conf.py @ONLY ) ``` 6. 相應地,Doxygen的`BREATHE_DOC_DOXY_FILE`模板文件配置為`BREATHE_DOC_BUILD_DIR`中的Doxyfile: ```cmake configure_file( ${BREATHE_DOC_DOXY_FILE} ${BREATHE_DOC_BUILD_DIR}/Doxyfile @ONLY ) ``` 7. 添加`BREATHE_DOC_TARGET_NAME`自定義目標。注意,只有Sphinx在運行時,對Doxygen的調用才發生在`BREATHE_DOC_SPHINX_FILE`中: ```cmake add_custom_target(${BREATHE_DOC_TARGET_NAME} COMMAND ${SPHINX_EXECUTABLE} -q -b html -c ${BREATHE_DOC_BUILD_DIR} -d ${BREATHE_DOC_CACHE_DIR} ${BREATHE_DOC_SOURCE_DIR} ${BREATHE_DOC_HTML_DIR} COMMENT "Building ${BREATHE_DOC_TARGET_NAME} documentation with Breathe, Sphinx and Doxygen" VERBATIM ) ``` 8. 最后,打印一條狀態信息: ```cmake message(STATUS "Added ${BREATHE_DOC_TARGET_NAME} [Breathe+Sphinx+Doxygen] target to build documentation") ``` 9. 配置完成后,構建文檔: ```shell $ mkdir -p build $ cd build $ cmake .. $ cmake --build . --target docs ``` 該文檔將在`BREATHE_DOC_HTML_DIR`子目錄中可用。啟動瀏覽器打開`index.html`文件后,可以導航到Message類的文檔: ![](https://img.kancloud.cn/24/99/2499470f6f57551ef4938726926d73e1_2765x1673.png) ## 工作原理 盡管在聲明定制的`BREATHE_DOC_TARGET_NAME`目標時只調用了Sphinx,但這里Doxygen和Sphinx都在運行。這要感謝Sphinx的`conf.py`文件中的以下設置: ```python def run_doxygen(folder): """Run the doxygen make command in the designated folder""" try: retcode = subprocess.call("cd {}; doxygen".format(folder), shell=True) if retcode < 0: sys.stderr.write( "doxygen terminated by signal {}".format(-retcode)) except OSError as e: sys.stderr.write("doxygen execution failed: {}".format(e)) def setup(app): run_doxygen('@BREATHE_DOC_BUILD_DIR@') ``` Doxygen將生成XML輸出,Breathe插件將能夠與所選擇的Sphinx文檔樣式一致的形式,呈現XML輸出。
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