Replace doxygen with doxygen+sphinx as doc tool

* Using doxygen+breathe+recommonmark+sphinx tools set, a better
  looking and usable documentation can be generated.

* Themes can be switched by replacing theme property in docs/conf.py.

* Removed obsolete doxygen files used by html format

* Add docs generation tools requirements to README. Note python3
  is the preferred and recommended version for docs generation.

Author: 9prady9

CMakeLists.txt

@@ -51,13 +51,14 @@ endif()
 
 #packages not available via hunter
 find_package(Doxygen    QUIET)
+find_package(Sphinx     QUIET)
 find_package(FreeImage  QUIET)
 if(UNIX)
     find_package(FontConfig REQUIRED)
 endif()
 
 option(FG_BUILD_DOCS
-    "Build Documentation" ${DOXYGEN_FOUND})
+    "Build Documentation" $<AND:${DOXYGEN_FOUND},${Sphinx_FOUND}>)
 option(FG_BUILD_EXAMPLES
     "Build Examples" ON)
 option(FG_WITH_FREEIMAGE

CMakeModules/FindSphinx.cmake

@@ -0,0 +1,9 @@
+find_program(SPHINX_EXECUTABLE
+    NAMES sphinx-build
+    DOC "Path to sphinx-build executable")
+
+include(FindPackageHandleStandardArgs)
+
+find_package_handle_standard_args(Sphinx
+    "Failed to find sphinx-build executable"
+    SPHINX_EXECUTABLE)

CMakeModules/examples.dox.in

@@ -10,7 +10,7 @@ An OpenGL interop library that can be used with ArrayFire or any other applicati
 
 ### Documentation
 
-You can find the most recent and updated documentation [here](http://arrayfire.org/forge/index.htm).
+You can find the latest documentation [here](http://arrayfire.org/forge/index.htm).
 
 ### Dependencies
 
@@ -19,6 +19,9 @@ You can find the most recent and updated documentation [here](http://arrayfire.o
 - [boost](https://www.boost.org/) - not a runtime dependency.
 - [FreeImage](http://freeimage.sourceforge.net/) (optional).
 - [fontconfig](http://www.freedesktop.org/wiki/Software/fontconfig/) on Linux and OSX.
+- Documentation Generation (preferred & recommended version of python is 3.\*)
+    * [Doxygen](http://doxygen.nl/)
+    * [Sphinx](http://www.sphinx-doc.org/) with extensions: [Breathe](https://breathe.readthedocs.io/en/latest/), [recommonmark](https://recommonmark.readthedocs.io/en/latest/)
 
 **Linux/Unix**: Dependencies should be available via respective package managers.
 **Windows**: We recommend [vcpkg](https://github.com/Microsoft/vcpkg).

README.md

@@ -18,47 +18,44 @@ set(EXAMPLES_DIR "${PROJECT_SOURCE_DIR}/examples")
 configure_file(${FG_DOCS_CONFIG} ${FG_DOCS_CONFIG_OUT})
 configure_file(${FG_DOCS_LAYOUT} ${FG_DOCS_LAYOUT_OUT})
 
-###########################################################
-## This generates a list of the examples cpp files and
-## creates a dox file under docs/details/examples.dox
-## This is used to generate documentation for examples
-###########################################################
-file(GLOB EXAMPLES_CPP
-    "${EXAMPLES_DIR}/cpu/*.cpp"
-    "${EXAMPLES_DIR}/cuda/*.cu"
-    "${EXAMPLES_DIR}/opencl/*.cpp"
-    "${EXAMPLES_DIR}/opencl/*.h"
-    )
-
-# Sort alphabetically
-# Note: example directories will be major sort order
-list(SORT EXAMPLES_CPP)
-
-# Get filenames and write to a string
-foreach(SRC ${EXAMPLES_CPP})
-    get_filename_component(DIR_PATH ${SRC} DIRECTORY)
-    get_filename_component(DIR_NAME ${DIR_PATH} NAME)
-    get_filename_component(SRC_NAME ${SRC} NAME)
-    set(EXAMPLES_LIST "${EXAMPLES_LIST}\\example ${DIR_NAME}/${SRC_NAME}\n")
-endforeach(SRC ${EXAMPLES_CPP})
-
-# Write string containing file names to examples.dox
-configure_file(
-    ${PROJECT_SOURCE_DIR}/CMakeModules/examples.dox.in
-    ${DOCS_DIR}/details/examples.dox
-)
-###########################################################
-
 add_custom_target(docs
     ALL
     COMMAND ${DOXYGEN_EXECUTABLE} ${FG_DOCS_CONFIG_OUT}
-    COMMAND cmake -E copy_directory ${ASSETS_DIR} ${CMAKE_CURRENT_BINARY_DIR}/html
     WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
     COMMENT "Generating Documentation"
     VERBATIM)
 
+set(SPHINX_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
+set(SPHINX_BUILD_DIR "${CMAKE_CURRENT_BINARY_DIR}/sphinx")
+set(SPHINX_INDEX_FILE ${SPHINX_BUILD_DIR}/index.html)
+set(DOXY_OUT_DIR ${CMAKE_CURRENT_BINARY_DIR}/xml)
+set(DOXY_INDEX_FILE ${DOXY_OUT_DIR}/index.xml)
+
+file(GLOB restFiles rst/*.rst)
+file(GLOB mdFiles markdown/*.md)
+
+# Only regenerate Sphinx when:
+# - Doxygen has rerun
+# - Our doc files have been updated
+# - The Sphinx config has been updated
+add_custom_command(OUTPUT ${SPHINX_INDEX_FILE}
+    COMMAND
+    ${SPHINX_EXECUTABLE} -Dbreathe_projects.Forge=${DOXY_OUT_DIR}
+    ${SPHINX_SOURCE_DIR} ${SPHINX_BUILD_DIR}
+    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+    DEPENDS
+    ${CMAKE_CURRENT_SOURCE_DIR}/index.rst
+    ${DOXY_INDEX_FILE}
+    ${restFiles}
+    ${mdFiles}
+    MAIN_DEPENDENCY ${SPHINX_SOURCE_DIR}/conf.py
+    COMMENT "Generating documentation with Sphinx")
+
+# Nice named target so we can run the job easily
+add_custom_target(Sphinx ALL DEPENDS ${SPHINX_INDEX_FILE} docs)
+
 # Install Doxygen documentation
-install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/html
+install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/sphinx
     DESTINATION ${FG_INSTALL_DOC_DIR}
     COMPONENT documentation
     PATTERN "*"

docs/CMakeLists.txt

@@ -0,0 +1,177 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# Forge documentation build configuration file, created by
+# sphinx-quickstart on Tue Jun  4 14:52:58 2019.
+#
+# This file is execfile()d with the current directory set to its
+# containing dir.
+#
+# Note that not all possible configuration values are present in this
+# autogenerated file.
+#
+# All configuration values have a default; values that are commented out
+# serve to show the default.
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#
+# import os
+# import sys
+# sys.path.insert(0, os.path.abspath('.'))
+
+
+# -- General configuration ------------------------------------------------
+
+# If your documentation needs a minimal Sphinx version, state it here.
+#
+# needs_sphinx = '1.0'
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = ['sphinx.ext.mathjax', 'breathe', 'recommonmark']
+
+# Breathe Configuration
+breathe_default_project = "Forge"
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix(es) of source filenames.
+# You can specify multiple suffix as a list of string:
+#
+source_suffix = ['.rst', '.md']
+
+# The master toctree document.
+master_doc = 'index'
+
+# General information about the project.
+project = 'Forge'
+copyright = '2019 ArrayFire'
+author = 'technical@arrayfire.com'
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The short X.Y version.
+version = '1.0'
+# The full version, including alpha/beta/rc tags.
+release = '1.0.4'
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#
+# This is also used if you do content translation via gettext catalogs.
+# Usually you set "language" from the command line for these cases.
+language = None
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This patterns also effect to html_static_path and html_extra_path
+exclude_patterns = []
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = 'sphinx'
+
+# If true, `todo` and `todoList` produce output, else they produce nothing.
+todo_include_todos = False
+
+
+# -- Options for HTML output ----------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+#
+html_theme = 'sphinx_rtd_theme'
+#html_theme_path = ['.']
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+
+html_theme_options = {
+        'style_nav_header_background':'#073763',
+        # Toc options
+        'collapse_navigation': True,
+        'sticky_navigation': True,
+        'navigation_depth': 4,
+        }
+html_favicon = '../assets/arrayfire.ico'
+html_logo = '../assets/arrayfire_icon.png'
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+# html_static_path = ['_static']
+
+# Custom sidebar templates, must be a dictionary that maps document names
+# to template names.
+#
+# This is required for the alabaster theme
+# refs: http://alabaster.readthedocs.io/en/latest/installation.html#sidebars
+html_sidebars = {
+    '**': [
+        'relations.html',  # needs 'show_related': True theme option to display
+        'searchbox.html',
+    ]
+}
+
+
+# -- Options for HTMLHelp output ------------------------------------------
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = 'Forgedoc'
+
+
+# -- Options for LaTeX output ---------------------------------------------
+
+latex_elements = {
+    # The paper size ('letterpaper' or 'a4paper').
+    #
+    # 'papersize': 'letterpaper',
+
+    # The font size ('10pt', '11pt' or '12pt').
+    #
+    # 'pointsize': '10pt',
+
+    # Additional stuff for the LaTeX preamble.
+    #
+    # 'preamble': '',
+
+    # Latex figure (float) alignment
+    #
+    # 'figure_align': 'htbp',
+}
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title,
+#  author, documentclass [howto, manual, or own class]).
+latex_documents = [
+    (master_doc, 'Forge.tex', 'Forge Documentation',
+     'technical@arrayfire.com', 'manual'),
+]
+
+
+# -- Options for manual page output ---------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+    (master_doc, 'forge', 'Forge Documentation',
+     [author], 1)
+]
+
+
+# -- Options for Texinfo output -------------------------------------------
+
+# Grouping the document tree into Texinfo files. List of tuples
+# (source start file, target name, title, author,
+#  dir menu entry, description, category)
+texinfo_documents = [
+    (master_doc, 'Forge', 'Forge Documentation',
+     author, 'Forge', 'One line description of project.',
+     'Miscellaneous'),
+]

docs/conf.py

@@ -757,10 +757,9 @@ WARN_LOGFILE           =
 # spaces.
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = ${DOCS_DIR}/pages \
+INPUT                  = ${DOCS_DIR}/markdown \
                          ${INCLUDE_DIR}/ \
-                         ${INCLUDE_DIR}/fg/ \
-                         ${DOCS_DIR}/details
+                         ${INCLUDE_DIR}/fg/
 
 # 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
@@ -898,7 +897,7 @@ FILTER_SOURCE_PATTERNS =
 # (index.html). This can be useful if you have a project on for instance GitHub
 # and want to reuse the introduction page also for the doxygen output.
 
-USE_MDFILE_AS_MAINPAGE = ${DOCS_DIR}/pages/README.md
+#USE_MDFILE_AS_MAINPAGE = ${DOCS_DIR}/markdown/README.md
 
 #---------------------------------------------------------------------------
 # Configuration options related to source browsing
@@ -1019,7 +1018,7 @@ IGNORE_PREFIX          =
 # If the GENERATE_HTML tag is set to YES doxygen will generate HTML output
 # The default value is: YES.
 
-GENERATE_HTML          = YES
+GENERATE_HTML          = NO
 
 # The HTML_OUTPUT tag is used to specify where the HTML docs will be put. If a
 # relative path is entered the value of OUTPUT_DIRECTORY will be put in front of
@@ -1054,7 +1053,7 @@ HTML_FILE_EXTENSION    = .htm
 # of the possible markers and block names see the documentation.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-HTML_HEADER            = ${DOCS_DIR}/header.html
+#HTML_HEADER            = ${DOCS_DIR}/header.html
 
 # The HTML_FOOTER tag can be used to specify a user-defined HTML footer for each
 # generated HTML page. If the tag is left blank doxygen will generate a standard
@@ -1064,7 +1063,7 @@ HTML_HEADER            = ${DOCS_DIR}/header.html
 # that doxygen normally uses.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-HTML_FOOTER            = ${DOCS_DIR}/footer.html
+#HTML_FOOTER            = ${DOCS_DIR}/footer.html
 
 # The HTML_STYLESHEET tag can be used to specify a user-defined cascading style
 # sheet that is used by each HTML page. It can be used to fine-tune the look of
@@ -1810,7 +1809,7 @@ MAN_LINKS              = NO
 # captures the structure of the code including all documentation.
 # The default value is: NO.
 
-GENERATE_XML           = NO
+GENERATE_XML           = YES
 
 # The XML_OUTPUT tag is used to specify where the XML pages will be put. If a
 # relative path is entered the value of OUTPUT_DIRECTORY will be put in front of