Enable Read the Docs build of documentation

docs/Doxyfile.in

@@ -790,7 +790,7 @@ WARN_LOGFILE           =
 # spaces. See also FILE_PATTERNS and EXTENSION_MAPPING
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = @ENHANCEDENUM_HEADERS@
+INPUT                  = "@ENHANCEDENUM_INCLUDE_DIR@/enhanced_enum"
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses

docs/conf.py

@@ -11,6 +11,7 @@
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 #
 import os
+import subprocess
 import sys
 
 sys.path.insert(0, os.path.abspath("../python"))
@@ -62,3 +63,19 @@
 
 # Breathe Configuration
 breathe_default_project = "EnhancedEnum"
+
+read_the_docs_build = os.environ.get("READTHEDOCS", None) == 'True'
+
+breathe_projects = {}
+
+if read_the_docs_build:
+    input_dir = "../cxx/include"
+    output_dir = "build"
+    with open("Doxyfile.in") as infile:
+        doxyfile_contents = infile.read()
+    doxyfile_contents = doxyfile_contents.replace("@ENHANCEDENUM_INCLUDE_DIR@", input_dir)
+    doxyfile_contents = doxyfile_contents.replace("@DOXYGEN_OUTPUT_DIR@", output_dir)
+    with open("Doxyfile", "w") as outfile:
+        outfile.write(doxyfile_contents)
+    subprocess.call('doxygen', shell=True)
+    breathe_projects['EnhancedEnum'] = output_dir + '/xml'

docs/requirements.txt

@@ -0,0 +1,2 @@
+# For running breathe in Read the Docs
+breathe