refactor(doc): Use cmake APP_VERSION in conf.py

This also moves the doc generation completely into cmake (no more
Makefile).

To generate the docs the project needs to first be configured and then
`make doc` can be run.

The approach used is leaned on the cmake's project own use of Sphinx:
Utilities/Sphinx/CMakeLists.txt

.gitignore

@@ -1,7 +1,6 @@
 /build/*
 /doc/config
 /include/settings.hpp
-/man/polybar.1
 /polybar
 /polybar-msg
 /tags

doc/.gitignore

@@ -1 +0,0 @@
-build

doc/CMakeLists.txt

@@ -94,16 +94,43 @@ install(FILES config
 # }}}
 
 # Documentation {{{
+configure_file(conf.py.in conf.py @ONLY)
 
-add_custom_target(doc ALL
-  WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/doc
-  COMMAND make html man)
+set(SPHINX_FLAGS "" CACHE STRING "Flags to pass to sphinx-build")
+separate_arguments(sphinx_flags UNIX_COMMAND "${SPHINX_FLAGS}")
 
-install(DIRECTORY build/html/
+set(doc_path "${CMAKE_CURRENT_SOURCE_DIR}")
+
+# We want to run `sphinx-build` with the following builders
+set(doc_builders "html" "man")
+
+# Name of all documentation targets
+set(doc_targets "")
+
+foreach(builder ${doc_builders})
+  set(doc_target "doc_${builder}")
+  set(builder_log "builder-${builder}.log")
+  add_custom_target(${doc_target}
+    COMMAND sphinx-build
+            -b ${builder}
+            -c "${CMAKE_CURRENT_BINARY_DIR}"
+            -d "${CMAKE_CURRENT_BINARY_DIR}/doctrees"
+            ${sphinx_flags}
+            "${CMAKE_SOURCE_DIR}/doc"
+            "${CMAKE_CURRENT_BINARY_DIR}/${builder}" > ${builder_log}
+    COMMENT "sphinx-build ${builder}: see doc/${builder_log}")
+
+  list(APPEND doc_targets ${doc_target})
+endforeach()
+
+# Dummy target that depends on all documentation targets
+add_custom_target(doc ALL DEPENDS ${doc_targets})
+
+install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/html/
   DESTINATION share/doc/polybar
   COMPONENT doc)
 
-install(FILES build/man/polybar.1
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/man/polybar.1
   DESTINATION ${CMAKE_INSTALL_PREFIX}/share/man/man1
   COMPONENT doc)
 # }}}

doc/Makefile

@@ -1,19 +0,0 @@
-# Minimal makefile for Sphinx documentation
-#
-
-# You can set these variables from the command line.
-SPHINXOPTS    =
-SPHINXBUILD   = sphinx-build
-SOURCEDIR     = .
-BUILDDIR      = build
-
-# Put it first so that "make" without argument is like "make help".
-help:
-	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
-
-.PHONY: help Makefile
-
-# Catch-all target: route all unknown targets to Sphinx using the new
-# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
-%: Makefile
-	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)

doc/README.md

@@ -11,7 +11,11 @@ The documentation uses [Sphinx](http://www.sphinx-doc.org/en/stable/) with the "
 [`sphinx_rtd_theme`](https://github.com/rtfd/sphinx_rtd_theme/) to generate the documentation, so you will need to
 have those installed.
 
-You can then run `make html` inside this folder and sphinx will generate the html documentation inside `doc/build/html`.
-Open `doc/build/html/index.html` to read the documentation in the browser.
+To generate the documentation you first need to configure polybar the same as when you compile it (`cmake ..` in `build`
+folder).
+After that you can run `make doc` to generate all of the documentation or `make doc_html` or `make doc_man` to only
+generate the html documentation or the man pages.
 
-With `make man` it will generate the man pages in the `doc/build/man` folder.
+Open `build/doc/html/index.html` to read the documentation in the browser.
+
+The manual pages are placed in `build/doc/man`.

doc/conf.py.in

@@ -24,8 +24,7 @@ copyright = ''
 author = 'Polybar Team'
 
 # The short X.Y version
-# TODO set this dynamically
-version = '3.2.1'
+version = '@APP_VERSION@'
 # The full version, including alpha/beta/rc tags
 release = version
 
@@ -43,7 +42,7 @@ extensions = [
 ]
 
 # Add any paths that contain templates here, relative to this directory.
-templates_path = ['_templates']
+templates_path = ['@doc_path@/_templates']
 
 # The suffix(es) of source filenames.
 # You can specify multiple suffix as a list of string:
@@ -86,7 +85,7 @@ html_theme = 'sphinx_rtd_theme'
 # 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']
+html_static_path = ['@doc_path@/_static']
 
 # Custom sidebar templates, must be a dictionary that maps document names
 # to template names.