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docs/conf.py: Respect env variable SPHINX_IMGMATH

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On some distros with coarse-grained packaging policy, dvipng is
installed along with latex.  In such cases, math rendering will
use imgmath by default.  It is possible to override the choice by
specifying the option string of "-D html_math_renderer='mathjax'"
to sphinx-build (Sphinx >= 1.8).

To provide developers an easier-to-use knob, add code for an env
variable "SPHINX_IMGMATH" which overrides the automatic choice
of math renderer for html docs.

    SPHINX_IMGMATH=yes : Load imgmath even if dvipng is not found
    SPHINX_IMGMATH=no  : Don't load imgmath (fall back to mathjax)

Signed-off-by: Akira Yokosawa <akiyks@gmail.com>
Acked-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Link: https://lore.kernel.org/r/5a582b2b-d51c-a062-36b2-19479cf68fab@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Akira Yokosawa 2022-08-27 13:38:17 +09:00 committed by Jonathan Corbet
parent 6b0d3e7c58
commit 3b384e9564
1 changed files with 14 additions and 2 deletions
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16
Documentation/conf.py
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@ -123,8 +123,20 @@ autosectionlabel_maxdepth = 2
# mathjax is the default math renderer since Sphinx 1.8.
have_latex = have_command('latex')
have_dvipng = have_command('dvipng')
load_imgmath = ((have_latex and have_dvipng)
or (major == 1 and minor < 8)
load_imgmath = have_latex and have_dvipng
# Respect SPHINX_IMGMATH (for html docs only)
if 'SPHINX_IMGMATH' in os.environ:
env_sphinx_imgmath = os.environ['SPHINX_IMGMATH']
if 'yes' in env_sphinx_imgmath:
load_imgmath = True
elif 'no' in env_sphinx_imgmath:
load_imgmath = False
else:
sys.stderr.write("Unknown env SPHINX_IMGMATH=%s ignored.\n" % env_sphinx_imgmath)
# Always load imgmath for Sphinx <1.8 or for epub docs
load_imgmath = (load_imgmath or (major == 1 and minor < 8)
or 'epub' in sys.argv)
if load_imgmath: