Currently, math expressions using the "math::" directive or the ":math:" role of Sphinx need the imgmath extension for proper rendering in html and epub builds. imgmath requires dvipng (and latex). Otherwise, "make htmldocs" will complain of missing commands. As a matter of fact, the mathjax extension is loaded by default since Sphinx v1.8 and it is good enough for html docs without any dependency on texlive packages. Stop loading the imgmath extension for html docs unless requirements for imgmath are met. For epub docs, keep the same behavior of always loading imgmath. Signed-off-by: Akira Yokosawa <akiyks@xxxxxxxxx> Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> --- Documentation/conf.py | 34 +++++++++++++++++++++++++++++++++- 1 file changed, 33 insertions(+), 1 deletion(-) diff --git a/Documentation/conf.py b/Documentation/conf.py index 934727e23e0e..3ec1f845c839 100644 --- a/Documentation/conf.py +++ b/Documentation/conf.py @@ -15,6 +15,23 @@ import sys import os import sphinx +from subprocess import check_output + +# helper +# ------ + +def have_command(cmd, ver_opt, str_in_ver): + """Run ```cmd`` with ``ver_opt`` and see if ``str_in_ver`` is found + or not. + """ + + try: + ver_str = check_output([cmd, ver_opt]).decode('utf-8', 'ignore') + have_cmd = str_in_ver in ver_str + except: + have_cmd = False + + return have_cmd # Get Sphinx version major, minor, patch = sphinx.version_info[:3] @@ -106,7 +123,22 @@ else: autosectionlabel_prefix_document = True autosectionlabel_maxdepth = 2 -extensions.append("sphinx.ext.imgmath") +# Load math renderer: +# For html builder, load imgmath only when its dependencies are met. +# mathjax is the default math renderer since Sphinx 1.8. +have_latex = have_command('latex', '--version', 'pdfTeX') +have_dvipng = have_command('dvipng', '--version', 'dvipng') +load_imgmath = ((have_latex and have_dvipng) + or (major == 1 and minor < 8) + or 'epub' in sys.argv) + +if load_imgmath: + extensions.append("sphinx.ext.imgmath") + math_renderer = 'imgmath' +else: + math_renderer = 'mathjax' + +sys.stderr.write("math_renderer: %s\n" % math_renderer) # Add any paths that contain templates here, relative to this directory. templates_path = ['_templates'] -- 2.25.1