From 34a309eb3c78e9a1a9807fbf09a01d69155bac60 Mon Sep 17 00:00:00 2001
From: Alfi Maulana <alfi.maulana.f@gmail.com>
Date: Mon, 10 Jul 2023 12:55:21 +0700
Subject: [PATCH] build: add support to auto-install doxygen if not found

---
 .github/workflows/build.yml                |  4 ----
 error/cmake/target_generate_xml_docs.cmake | 20 +++++++++++++++++---
 2 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 239841c..47afced 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -105,10 +105,6 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v3.5.3
 
-      - name: Install requirements
-        run: |
-          sudo apt-get install -y doxygen
-
       - name: Configure and build documentation
         uses: threeal/cmake-action@v1.2.0
         with:
diff --git a/error/cmake/target_generate_xml_docs.cmake b/error/cmake/target_generate_xml_docs.cmake
index 2d9938f..6229475 100644
--- a/error/cmake/target_generate_xml_docs.cmake
+++ b/error/cmake/target_generate_xml_docs.cmake
@@ -1,5 +1,21 @@
-# A function that generates XML documentation from the specified target.
+# A function that generates XML documentation for the specified target.
 function(target_generate_xml_docs TARGET)
+  # Try to install Doxygen if not found
+  find_program(DOXYGEN_PROGRAM doxygen)
+  if(NOT DOXYGEN_PROGRAM)
+    find_program(APT_GET_PROGRAM apt-get)
+    if(APT_GET_PROGRAM)
+      message(STATUS "Doxygen could not be found, installing...")
+      execute_process(COMMAND ${APT_GET_PROGRAM} install -y doxygen)
+    endif()
+
+    find_program(BREW_PROGRAM brew)
+    if(BREW_PROGRAM)
+      message(STATUS "Doxygen could not be found, installing...")
+      execute_process(COMMAND ${BREW_PROGRAM} install doxygen)
+    endif()
+  endif()
+
   # Try to find Doxygen
   find_package(Doxygen)
   if(DOXYGEN_FOUND)
@@ -25,7 +41,5 @@ function(target_generate_xml_docs TARGET)
     # Generate XML documentation for the target
     doxygen_add_docs(${TARGET}_docs ${HEADER_FILES} USE_STAMP_FILE)
     add_dependencies(${TARGET} ${TARGET}_docs)
-  else()
-    message(WARNING "Could not found Doxygen!")
   endif()
 endfunction()