Issue sympy#24304 fix

Add "-nogs" option for dvipng call
Add 10s timeout for subprocess calls

sympy/printing/preview.py

@@ -1,7 +1,7 @@
 import os
-from os.path import join
 import shutil
 import tempfile
+from os.path import join
 
 try:
     from subprocess import STDOUT, CalledProcessError, check_output
@@ -13,16 +13,17 @@
 from .latex import latex
 
 __doctest_requires__ = {('preview',): ['pyglet']}
+CALLS_TIMEOUT = 10.0  # Time-out system command calls
 
 
 def _check_output_no_window(*args, **kwargs):
     # Avoid showing a cmd.exe window when running this
     # on Windows
     if os.name == 'nt':
-        creation_flag = 0x08000000 # CREATE_NO_WINDOW
+        creation_flag = 0x08000000  # CREATE_NO_WINDOW
     else:
-        creation_flag = 0 # Default value
-    return check_output(*args, creationflags=creation_flag, **kwargs)
+        creation_flag = 0  # Default value
+    return check_output(*args, creationflags=creation_flag, timeout=CALLS_TIMEOUT, **kwargs)
 
 
 def system_default_viewer(fname, fmt):
@@ -67,8 +68,8 @@ def pyglet_viewer(fname, fmt):
 
     config = gl.Config(double_buffer=False)
     win = window.Window(
-        width=img.width + 2*offset,
-        height=img.height + 2*offset,
+        width=img.width + 2 * offset,
+        height=img.height + 2 * offset,
         caption="SymPy",
         resizable=False,
         config=config
@@ -148,7 +149,7 @@ def _get_latex_main(expr, *, preamble=None, packages=(), extra_preamble=None,
 
 
 @doctest_depends_on(exe=('latex', 'dvipng'), modules=('pyglet',),
-            disable_viewers=('evince', 'gimp', 'superior-dvi-viewer'))
+                    disable_viewers=('evince', 'gimp', 'superior-dvi-viewer'))
 def preview(expr, output='png', viewer=None, euler=True, packages=(),
             filename=None, outputbuffer=None, preamble=None, dvioptions=None,
             outputTexFile=None, extra_preamble=None, fontsize=None,
@@ -266,9 +267,9 @@ def preview(expr, output='png', viewer=None, euler=True, packages=(),
         # sorted in order from most pretty to most ugly
         # very discussable, but indeed 'gv' looks awful :)
         candidates = {
-            "dvi": [ "evince", "okular", "kdvi", "xdvi" ],
-            "ps": [ "evince", "okular", "gsview", "gv" ],
-            "pdf": [ "evince", "okular", "kpdf", "acroread", "xpdf", "gv" ],
+            "dvi": ["evince", "okular", "kdvi", "xdvi"],
+            "ps": ["evince", "okular", "gsview", "gv"],
+            "pdf": ["evince", "okular", "kpdf", "acroread", "xpdf", "gv"],
         }
 
         for candidate in candidates.get(output, []):
@@ -346,7 +347,7 @@ def preview(expr, output='png', viewer=None, euler=True, packages=(),
                     raise RuntimeError("%s is not installed" % cmd_variants[0])
 
             defaultoptions = {
-                "dvipng": ["-T", "tight", "-z", "9", "--truecolor"],
+                "dvipng": ["-T", "tight", "--nogs", "-z", "9", "--truecolor"],
                 "dvisvgm": ["--no-fonts"],
             }
 
@@ -372,7 +373,6 @@ def preview(expr, output='png', viewer=None, euler=True, packages=(),
                     "'%s' exited abnormally with the following output:\n%s" %
                     (' '.join(cmd), e.output))
 
-
         if viewer == "file":
             shutil.move(join(workdir, src), filename)
         elif viewer == "BytesIO":