Add sphinx-autobuild for livehtml Makefile target

CHANGES.rst

@@ -63,6 +63,7 @@ New features:
 
 - Test compatibility with Python 3.12
 - Add function ``icalendar.use_pytz()``.
+- Add `sphinx-autobuild` for `livehtml` Makefile target.
 
 Bug fixes:
 

docs/Makefile

@@ -2,11 +2,12 @@
 #
 
 # You can set these variables from the command line.
-SPHINXOPTS    =
-SPHINXBUILD   = sphinx-build
-PAPER         =
-BUILDDIR      = _build
-LOCALESDIR    = _locales
+SPHINXOPTS      =
+SPHINXBUILD     = sphinx-build
+SPHINXAUTOBUILD = sphinx-autobuild
+PAPER           =
+BUILDDIR        = _build
+LOCALESDIR      = _locales
 
 # Internal variables.
 PAPEROPT_a4     = -D latex_paper_size=a4
@@ -15,7 +16,7 @@ ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
 # the i18n builder cannot share the environment and doctrees with the others
 I18NSPHINXOPTS  = $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
 
-.PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest gettext
+.PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest gettext livehtml
 
 help:
 	@echo "Please use \`make <target>' where <target> is one of"
@@ -159,3 +160,9 @@ doctest:
 	$(SPHINXBUILD) -b doctest $(ALLSPHINXOPTS) $(BUILDDIR)/doctest
 	@echo "Testing of doctests in the sources finished, look at the " \
 	      "results in $(BUILDDIR)/doctest/output.txt."
+
+livehtml:
+	$(SPHINXAUTOBUILD) \
+	--ignore "*.swp" \
+	--port 8050 \
+	-b html . "$(BUILDDIR)/html" $(SPHINXOPTS) $(O)

requirements_docs.txt

@@ -1,3 +1,4 @@
 Sphinx>=1.2.3
 sphinx_rtd_theme
+sphinx-autobuild
 .