From 2a4f2df2244018f525d23805f9fbdfa3f21b4570 Mon Sep 17 00:00:00 2001
From: Robin Krahl <me@robin-krahl.de>
Date: Wed, 16 Jan 2019 19:17:17 +0100
Subject: Add a doc target that generates C API documentation

Doxygen is used generate the C API documentation.  The Doxygen
configuration is stored in the Doxygen.in file (that is processed by
CMake).  To generate the documentation, run make doc in the build
directory.
---
 CMakeLists.txt |  9 +++++++++
 Doxyfile.in    | 17 +++++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 Doxyfile.in

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1004baf..f7d98a3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -233,3 +233,12 @@ set (CPACK_RESOURCE_FILE_LICENSE
         "${CMAKE_CURRENT_SOURCE_DIR}/LICENSE")
 set (CPACK_PACKAGE_VERSION "${PROJECT_VERSION}")
 include (CPack)
+
+# Build Doxygen documentation for the C API
+find_package(Doxygen)
+if (DOXYGEN_FOUND)
+    configure_file(${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile.in ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile @ONLY)
+    add_custom_target(doc ${DOXYGEN_EXECUTABLE} Doxyfile
+        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+        COMMENT "Generating C API documentation with Doxygen" VERBATIM)
+endif(DOXYGEN_FOUND)
diff --git a/Doxyfile.in b/Doxyfile.in
new file mode 100644
index 0000000..9211df1
--- /dev/null
+++ b/Doxyfile.in
@@ -0,0 +1,17 @@
+# For better readability, the documentation and default settings are removed
+# from this file.  For more information on the Doxygen configuration, generate
+# a new Doxyfile using `doxygen -g` or have a look at the Doxygen manual at
+# http://www.doxygen.nl/manual/config.html
+#
+# This file is processed by CMake.  To generate the documentation, run `make
+# doc` in the build directory.
+
+PROJECT_NAME           = "@CMAKE_PROJECT_NAME@"
+PROJECT_NUMBER         = "@PROJECT_VERSION@"
+PROJECT_BRIEF          =
+OUTPUT_DIRECTORY       = doc
+STRIP_FROM_PATH        = @CMAKE_CURRENT_SOURCE_DIR@
+JAVADOC_AUTOBRIEF      = YES
+OPTIMIZE_OUTPUT_FOR_C  = YES
+WARN_NO_PARAMDOC       = YES
+INPUT                  = @CMAKE_CURRENT_SOURCE_DIR@/NK_C_API.h
-- 
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