imgmath: Use template file for LaTeX

CHANGES

@@ -44,6 +44,9 @@ Deprecated
 * ``sphinx.ext.autodoc.importer.MockLoader``
 * ``sphinx.ext.autodoc.importer.mock()``
 * ``sphinx.ext.autosummary.autolink_role()``
+* ``sphinx.ext.imgmath.DOC_BODY``
+* ``sphinx.ext.imgmath.DOC_BODY_PREVIEW``
+* ``sphinx.ext.imgmath.DOC_HEAD``
 * ``sphinx.transforms.CitationReferences``
 * ``sphinx.transforms.SmartQuotesSkipper``
 * ``sphinx.util.docfields.DocFieldTransformer.preprocess_fieldtypes()``

doc/extdev/deprecated.rst

@@ -177,6 +177,21 @@ The following is a list of deprecated interfaces.
      - 4.0
      - ``sphinx.ext.autosummary.AutoLink``
 
+   * - ``sphinx.ext.imgmath.DOC_BODY``
+     - 2.1
+     - 4.0
+     - N/A
+
+   * - ``sphinx.ext.imgmath.DOC_BODY_PREVIEW``
+     - 2.1
+     - 4.0
+     - N/A
+
+   * - ``sphinx.ext.imgmath.DOC_HEAD``
+     - 2.1
+     - 4.0
+     - N/A
+
    * - ``sphinx.transforms.CitationReferences``
      - 2.1
      - 4.0

sphinx/ext/imgmath.py

@@ -21,12 +21,15 @@ from subprocess import CalledProcessError, PIPE
 from docutils import nodes
 
 import sphinx
+from sphinx import package_dir
+from sphinx.deprecation import RemovedInSphinx40Warning, deprecated_alias
 from sphinx.errors import SphinxError
 from sphinx.locale import _, __
 from sphinx.util import logging
 from sphinx.util.math import get_node_equation_number, wrap_displaymath
 from sphinx.util.osutil import ensuredir
 from sphinx.util.png import read_png_depth, write_png_depth
+from sphinx.util.template import LaTeXRenderer
 
 if False:
     # For type annotation
@@ -38,6 +41,8 @@ if False:
 
 logger = logging.getLogger(__name__)
 
+templates_path = path.join(package_dir, 'templates', 'imgmath')
+
 
 class MathExtError(SphinxError):
     category = 'Math extension error'
@@ -87,19 +92,27 @@ DOC_BODY_PREVIEW = r'''
 depth_re = re.compile(br'\[\d+ depth=(-?\d+)\]')
 
 
-def generate_latex_macro(math, config):
+def generate_latex_macro(math, config, confdir=''):
-    # type: (str, Config) -> str
+    # type: (str, Config, str) -> str
     """Generate LaTeX macro."""
-    fontsize = config.imgmath_font_size
+    variables = {
-    baselineskip = int(round(fontsize * 1.2))
+        'fontsize': config.imgmath_font_size,
+        'baselineskip': int(round(config.imgmath_font_size * 1.2)),
+        'preamble': config.imgmath_latex_preamble,
+        'math': math
+    }
 
-    latex = DOC_HEAD + config.imgmath_latex_preamble
     if config.imgmath_use_preview:
-        latex += DOC_BODY_PREVIEW % (fontsize, baselineskip, math)
+        template_name = 'preview.tex_t'
     else:
-        latex += DOC_BODY % (fontsize, baselineskip, math)
+        template_name = 'template.tex_t'
 
-    return latex
+    for template_dir in config.templates_path:
+        template = path.join(confdir, template_dir, template_name)
+        if path.exists(template):
+            return LaTeXRenderer().render(template, variables)
+
+    return LaTeXRenderer(templates_path).render(template_name, variables)
 
 
 def ensure_tempdir(builder):
@@ -220,7 +233,7 @@ def render_math(self, math):
     if image_format not in SUPPORT_FORMAT:
         raise MathExtError('imgmath_image_format must be either "png" or "svg"')
 
-    latex = generate_latex_macro(math, self.builder.config)
+    latex = generate_latex_macro(math, self.builder.config, self.builder.confdir)
 
     filename = "%s.%s" % (sha1(latex.encode()).hexdigest(), image_format)
     relfn = posixpath.join(self.builder.imgpath, 'math', filename)
@@ -332,6 +345,15 @@ def html_visit_displaymath(self, node):
     raise nodes.SkipNode
 
 
+deprecated_alias('sphinx.ext.imgmath',
+                 {
+                     'DOC_BODY': DOC_BODY,
+                     'DOC_BODY_PREVIEW': DOC_BODY_PREVIEW,
+                     'DOC_HEAD': DOC_HEAD,
+                 },
+                 RemovedInSphinx40Warning)
+
+
 def setup(app):
     # type: (Sphinx) -> Dict[str, Any]
     app.add_html_math_renderer('imgmath',

sphinx/templates/imgmath/preview.tex_t

@@ -0,0 +1,18 @@
+\documentclass[12pt]{article}
+\usepackage[utf8x]{inputenc}
+\usepackage{amsmath}
+\usepackage{amsthm}
+\usepackage{amssymb}
+\usepackage{amsfonts}
+\usepackage{anyfontsize}
+\usepackage{bm}
+\pagestyle{empty}
+<%= preamble %>
+
+\usepackage[active]{preview}
+
+\begin{document}
+\begin{preview}
+\fontsize{<%= fontsize %>}{<%= baselineskip %}}\selectfont <%= math %>
+\end{preview}
+\end{document}

sphinx/templates/imgmath/template.tex_t

@@ -0,0 +1,14 @@
+\documentclass[12pt]{article}
+\usepackage[utf8x]{inputenc}
+\usepackage{amsmath}
+\usepackage{amsthm}
+\usepackage{amssymb}
+\usepackage{amsfonts}
+\usepackage{anyfontsize}
+\usepackage{bm}
+\pagestyle{empty}
+<%= preamble %>
+
+\begin{document}
+\fontsize{<%= fontsize %>}{<%= baselineskip %>}\selectfont <%= math %>
+\end{document}

sphinx/util/template.py

@@ -67,9 +67,10 @@ class SphinxRenderer(FileRenderer):
 
 
 class LaTeXRenderer(SphinxRenderer):
-    def __init__(self):
+    def __init__(self, template_path=None):
-        # type: () -> None
+        # type: (str) -> None
-        template_path = os.path.join(package_dir, 'templates', 'latex')
+        if template_path is None:
+            template_path = os.path.join(package_dir, 'templates', 'latex')
         super().__init__(template_path)
 
         # use texescape as escape filter