Adds option to fix SVGs. (3b1b#23)

Adds a new option to the constants.py, TEX_FIX_SVG. This is False by
default, but can be enabled to use cairosvg to fix SVGs automatically.

This allows the use of some fonts and shapes that might otherwise be
problematic.

constants.py

@@ -343,6 +343,7 @@ def init_directories(config):
         os.makedirs(folder)
 
 TEX_USE_CTEX = False
+TEX_FIX_SVG = False
 TEX_TEXT_TO_REPLACE = "YourTextHere"
 TEMPLATE_TEX_FILE = os.path.join(THIS_DIR, "tex_template.tex" if not TEX_USE_CTEX
     else "ctex_template.tex")

utils/tex_file_writing.py

@@ -4,6 +4,7 @@
 from constants import TEX_DIR
 from constants import TEX_TEXT_TO_REPLACE
 from constants import TEX_USE_CTEX
+from constants import TEX_FIX_SVG
 
 
 def tex_hash(expression, template_tex_file):
@@ -105,6 +106,18 @@ def dvi_to_svg(dvi_file, regen_if_exists=False, remove_rectangles=False):
             get_null()
         ]
         os.system(" ".join(commands))
+
+        if TEX_FIX_SVG:
+            commands = [
+                "cairosvg",
+                result,
+                "-f",
+                "svg",
+                "-o",
+                result
+            ]
+            os.system(" ".join(commands))
+
     if remove_rectangles:
         with open(result, "r+") as f:
             lines = f.readlines()
@@ -114,4 +127,5 @@ def dvi_to_svg(dvi_file, regen_if_exists=False, remove_rectangles=False):
                     f.write(line)
             f.truncate()
             f.close()
+
     return result