refactor(doc): Enable only if sphinx is available

CMakeLists.txt

@@ -58,7 +58,9 @@ include(03-libs)
 include(04-targets)
 include(05-summary)
 
-add_subdirectory(doc)
+if(BUILD_DOC)
+  add_subdirectory(doc)
+endif()
 add_subdirectory(doc/bash)
 add_subdirectory(doc/zsh)
 add_subdirectory(include)

cmake/02-opts.cmake

@@ -1,6 +1,7 @@
 #
 # Build options
 #
+checklib(BUILD_DOC "binary" sphinx-build)
 
 checklib(ENABLE_ALSA "pkg-config" alsa)
 checklib(ENABLE_CURL "pkg-config" libcurl)
@@ -30,7 +31,7 @@ option(CXXLIB_GCC "Link against stdlibc++" OFF)
 
 option(BUILD_IPC_MSG "Build ipc messager" ON)
 option(BUILD_TESTS "Build testsuite" OFF)
-option(BUILD_TESTS "Build documentation" ON)
+option(BUILD_DOC "Build documentation" ON)
 
 option(ENABLE_ALSA "Enable alsa support" ON)
 option(ENABLE_CURL "Enable curl support" ON)

doc/CMakeLists.txt

@@ -1,7 +1,3 @@
-if(NOT BUILD_DOC)
-  return()
-endif()
-
 #
 # Generate configuration file
 #
@@ -98,6 +94,14 @@ install(FILES config
 # }}}
 
 # Documentation {{{
+find_program(SPHINX_EXECUTABLE
+  NAMES sphinx-build
+  DOC "Sphinx Documentation Builder")
+
+if(NOT SPHINX_EXECUTABLE)
+  message_colored(FATAL_ERROR "Failed to locate sphinx-build" 31)
+endif()
+
 configure_file(conf.py.in conf.py @ONLY)
 
 set(SPHINX_FLAGS "" CACHE STRING "Flags to pass to sphinx-build")
@@ -115,7 +119,7 @@ foreach(builder ${doc_builders})
   set(doc_target "doc_${builder}")
   set(builder_log "builder-${builder}.log")
   add_custom_target(${doc_target}
-    COMMAND sphinx-build
+    COMMAND ${SPHINX_EXECUTABLE}
             -b ${builder}
             -c "${CMAKE_CURRENT_BINARY_DIR}"
             -d "${CMAKE_CURRENT_BINARY_DIR}/doctrees"