Add FindNaturalDocs

1 files changed, 45 insertions, 0 deletions

diff --git a/cmake/modules/FindNaturalDocs.cmake b/cmake/modules/FindNaturalDocs.cmake
new file mode 100644
index 0000000..9bd7044
--- /dev/null
+++ b/cmake/modules/FindNaturalDocs.cmake
@@ -0,0 +1,45 @@
+# - Find NaturalDocs
+# This module finds if NaturalDocs is installed, and adds it as an external
+# dependency if it isn't. This code sets the following variables:
+#
+#  NATURALDOCS_EXECUTABLE       = full path to the naturaldocs binary
+
+find_program(NATURALDOCS_EXECUTABLE NAMES naturaldocs NaturalDocs)
+
+if(NATURALDOCS_EXECUTABLE)
+    execute_process(COMMAND ${NATURALDOCS_EXECUTABLE} --help
+      RESULT_VARIABLE res
+      OUTPUT_VARIABLE var
+      ERROR_VARIABLE var
+      OUTPUT_STRIP_TRAILING_WHITESPACE
+      ERROR_STRIP_TRAILING_WHITESPACE)
+    if(res)
+      if(${NaturalDocs_FIND_REQUIRED})
+        message(FATAL_ERROR "Error executing naturaldocs --help")
+      elseif(NOT NaturalDocs_FIND_QUIETLY)
+        message(WARNING "Warning, could not run naturaldocs --help")
+      endif()
+    else()
+      if(var MATCHES ".*Natural Docs, version [0-9]+\\.[0-9]+.*")
+        string(REGEX REPLACE ".*Natural Docs, version ([0-9]+\\.[0-9]+).*"
+               "\\1" NATURALDOCS_VERSION_STRING "${var}")
+      else()
+        if(NOT NaturalDocs_FIND_QUIETLY)
+          message(WARNING "regex not supported: {$var}.")
+        endif()
+      endif()
+
+      string( REGEX REPLACE "([0-9]+).*" "\\1" NATURALDOCS_VERSION_MAJOR "${NATURALDOCS_VERSION_STRING}" )
+      string( REGEX REPLACE "[0-9]+\\.([0-9]+)" "\\1" NATURALDOCS_VERSION_MINOR "${NATURALDOCS_VERSION_STRING}" )
+      set(NATURALDOCS_VERSION ${NATURALDOCS_VERSION_MAJOR}.${NATURALDOCS_VERSION_MINOR})
+    endif()
+endif()
+
+mark_as_advanced(
+  NATURALDOCS_EXECUTABLE
+  )
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(NaturalDocs
+  REQUIRED_VARS NATURALDOCS_EXECUTABLE
+  VERSION_VAR NATURALDOCS_VERSION)
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