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oac_setup_sphinx.m4
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dnl -*- autoconf -*-
dnl
dnl Copyright (c) 2020-2022 Cisco Systems, Inc. All rights reserved.
dnl Copyright (c) 2024 Jeffrey M. Squyres. All rights reserved.
dnl Copyright (c) 2025 NVIDIA Corporation. All rights reserved.
dnl
dnl $COPYRIGHT$
dnl
dnl Additional copyrights may follow
dnl
dnl $HEADER$
dnl
dnl Setup Sphinx for building HTML docs and man pages
dnl
dnl 1 -> sanity file to check if pre-built docs are already available
dnl You probably want to pass something like
dnl "$srcdir/docs/_build/man/foo.1"
dnl
dnl 2 -> (OPTIONAL) URL to display in AC_MSG_WARN when docs will not be installed
dnl If $2 is empty, nothing will be displayed.
dnl Note: if $2 contains a #, be sure to double quote it
dnl (e.g., [[https://example.com/foo.html#some-anchor]])
dnl
dnl 3 -> (OPTIONAL) Filename of requirements.txt-like file containing
dnl the required Pip modules (to be displayed if rendering a
dnl simple RST project fails).
dnl
dnl This macro requires that OAC_PUSH_PREFIX was previously called.
dnl The pushed prefix may be used if this macro chooses to set {OAC
dnl prefix}_MAKEDIST_DISABLE. If set, it is a message indicating why
dnl "make dist" should be disabled, suitable for emitting via
dnl AC_MSG_WARN.
AC_DEFUN([OAC_SETUP_SPHINX],[
OAC_ASSERT_PREFIX_DEFINED([$0])
OAC_VAR_SCOPE_PUSH([oac_summary_msg oac_sphinx_result oac_install_docs oac_sphinx_target_version oac_sphinx_found_version])
# This option is probably only helpful to developers: have
# configure fail if Sphinx is not found (i.e., if you don't have
# the ability to use Sphinx to build the HTML docs and man pages).
AC_ARG_ENABLE([sphinx],
[AS_HELP_STRING([--enable-sphinx],
[Force configure to fail if Sphinx is not found (Sphinx is used to build the HTML docs and man pages). This option is likely only useful for developers; end users who are building from distribution tarballs do ***not*** need to have Sphinx installed])])
# By default assume we don't have to install. We'll update as we find
# either a sane building environment or pre-built documentation (from a tarball).
oac_install_docs=0
# To generate HTML docs + man pages, we need Sphinx. If we have
# Sphinx, then we're able to both build and install the docs
# (potentially overriding oac_install_docs from what it was set
# above).
AC_PATH_PROG([SPHINX_BUILD], [sphinx-build], [])
# If the user requested to disable sphinx, then pretend we didn't
# find it.
AS_IF([test "$enable_sphinx" = "no"],
[SPHINX_BUILD=])
# If we found Sphinx, check to ensure that it's a recent enough
# version.
AS_IF([test -n "$SPHINX_BUILD"],
[[oac_sphinx_target_version=`sed -n -e 's/sphinx[><=]*\([0-9\.]\)/\1/p' $srcdir/docs/requirements.txt`]
# Some older versions of Sphinx (e.g., Sphinx v1.1.3 in
# RHEL 7):
#
# - Don't support "--version".
# - But do emit the version number as part of the general
# CLI help when they don't recognize the --version CLI
# option.
#
# In that case, we only want the first line, and we want to
# strip off the leading "v" from the version number.
#
# In the case where --version *is* recognized, all the
# additional processing is harmless and we still end up
# with the Sphinx version number.
oac_sphinx_found_version=`$SPHINX_BUILD --version 2>&1 | head -n 1 | cut -d\ -f2 | sed -e 's/^v//'`
AC_MSG_CHECKING([if Sphinx version is high enough ($oac_sphinx_found_version >= $oac_sphinx_target_version)])
AS_VERSION_COMPARE([$oac_sphinx_found_version],
[$oac_sphinx_target_version],
[oac_sphinx_result=lesser],
[oac_sphinx_result=equal],
[oac_sphinx_result=greater])
AS_IF([test "$oac_sphinx_result" = "lesser"],
[SPHINX_BUILD=
AC_MSG_RESULT([no])],
[ # If we're building, we're also installing, regardless of
# whether we found pre-build docs or not (above).
oac_install_docs=1
AC_MSG_RESULT([yes])])
])
# If we found Sphinx, check to ensure that we have all the things
# required to build Open MPI/PRRTE/OpenPMIx-like documentation
# (e.g., any required pip modules). If we can't render a sample
# OMPI-like doc, we're not going to automatically install any
# missing pip modules; we'll just mark Sphinx as being
# unavailable.
AS_IF([test -n "$SPHINX_BUILD"],
[AC_MSG_CHECKING([for required Sphinx modules])
oac_startdir=`pwd`
oac_tmpdir=conftmp.$$
rm -rf $oac_tmpdir
mkdir $oac_tmpdir
cd $oac_tmpdir
cat > conf.py <<EOF
# Minimum config that we need for Open MPI/PRRTE/OpenPMIx-like docs
project = 'Testing'
copyright = 'Testing'
author = 'Testing'
import sphinx_rtd_theme
# Note the extra quoting needed for square brackets because this is m4
extensions = [[ 'recommonmark', 'sphinx_rtd_theme', 'sphinx.ext.extlinks' ]]
html_theme = 'sphinx_rtd_theme'
EOF
echo "Hello world" > index.rst
# Try to render this trivial RST project as both HTML and
# man pages and see if it works.
oac_happy=0
OAC_LOG_COMMAND([$SPHINX_BUILD -M html . build-html],
[OAC_LOG_COMMAND([$SPHINX_BUILD -M man . build-man],
[oac_happy=1])])
AS_IF([test $oac_happy -eq 1],
[AC_MSG_RESULT([found])],
[SPHINX_BUILD=
AC_MSG_RESULT([not found])])
cd $oac_startdir
rm -rf $oac_tmpdir
])
AS_IF([test -z "$SPHINX_BUILD"],
_oac_program_prefix[_MAKEDIST_DISABLE="$]_oac_program_prefix[_MAKEDIST_DISABLE Sphinx/Documentation"
AC_MSG_NOTICE([Could not find a suitable sphinx-build on your system.])
oac_install_docs=0
AS_IF([test -n "$3"],
[AC_MSG_NOTICE([If you want to build the documentation, ensure that the])
AC_MSG_NOTICE([Python modules in $3])
AC_MSG_NOTICE([are available.])
])
AC_MSG_NOTICE([You will not be able to build a distribution tarball.])
])
# Check if we have already-built docs (e.g., if we're
# in a tarball vs. a fresh git clone).
AC_MSG_CHECKING([if pre-built docs are available])
AS_IF([test -f "$1"],
[oac_install_docs=1
AC_MSG_RESULT([yes])],
[AC_MSG_RESULT([no])])
AS_IF([test $oac_install_docs -eq 0],
[AC_MSG_WARN([*** You will not have documentation installed.])
AS_IF([test -n "$2"],
[AC_MSG_WARN([*** See the following URL for more information:])
AC_MSG_WARN([*** $2])])
])
# If --enable-sphinx was specified and we did not find Sphinx,
# abort. This is likely only useful to prevent "oops!" moments
# from developers.
AS_IF([test -z "$SPHINX_BUILD" && test "$enable_sphinx" = "yes"],
[AC_MSG_WARN([A suitable Sphinx was not found, but --enable-sphinx was specified])
AC_MSG_ERROR([Cannot continue])])
# Construct a summary message. Due SUMMARY_ADD's implementation,
# do *not* include a comma.
AS_IF([test -n "$SPHINX_BUILD"],
[ # If we found Sphinx, we always both build and install.
oac_summary_msg="building and installing"],
[AS_IF([test $oac_install_docs -eq 1],
[oac_summary_msg="installing packaged docs"],
[oac_summary_msg="no documentation available"])])
OAC_SUMMARY_ADD([Miscellaneous], [HTML docs and man pages],
[$oac_summary_msg])
AM_CONDITIONAL(_oac_program_prefix[_BUILD_DOCS], [test -n "$SPHINX_BUILD"])
AM_CONDITIONAL(_oac_program_prefix[_INSTALL_DOCS], [test $oac_install_docs -eq 1])
OAC_VAR_SCOPE_POP
])