Add config.asy and psviewer that removes trash

To remove the useless eps.out file that is created by Asymptote
and to prevent an annoying gv popup, we create our own
config.asy, and arrange to have it run a program to remove
the out.eps (the programs file argument).

MANIFEST.in

@@ -4,9 +4,11 @@ include ChangeLog
 include COPYING.txt
 include Makefile
 include mathicsscript/autoload/settings.m
+include mathicsscript/config.asy
 include mathicsscript/data/inputrc-no-unicode
 include mathicsscript/data/inputrc-unicode
 include mathicsscript/data/mma-tables.json
+include mathicsscript/fake_psviewer.py
 include mathicsscript/user-settings.m
 recursive-include mathicsscript *.py
 recursive-include test *.py *.m

mathicsscript/asymptote.py

@@ -1,13 +1,31 @@
 #!/usr/bin/env python3
+"""Python module to feed Asymptote with commands
+(modified from gnuplot.py)
+"""
+
+import os
+import os.path as osp
 
-# Python module to feed Asymptote with commands
-# (modified from gnuplot.py)
 from subprocess import Popen, PIPE
 
+asy_program = os.environ.get("ASY_PROG", "asy")
+
+
+def get_srcdir():
+    filename = osp.normcase(osp.dirname(osp.abspath(__file__)))
+    return osp.realpath(filename)
+
+
+mydir = get_srcdir()
+asy_config = os.path.join(mydir, "config.asy")
+
 
 class Asy(object):
     def __init__(self, show_help=True):
-        self.session = Popen(["asy", "-quiet", "-inpipe=0", "-outpipe=2"], stdin=PIPE)
+        self.session = Popen(
+            [asy_program, f"-config={asy_config}", "-quiet", "-inpipe=0", "-outpipe=2"],
+            stdin=PIPE,
+        )
         if show_help:
             self.help()
 

mathicsscript/config.asy

@@ -0,0 +1,5 @@
+// This is an Asymptote configuration file for mathicsscript.
+// We set up a fake_previewer which will remove out.eps
+// that Asymptote wants to create
+import settings;
+psviewer="fake_psviewer.py";

mathicsscript/fake_psviewer.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env Python
+# -*- coding: utf-8 -*-
+"""
+This is a replacement for a PostScript previewer like gv
+which does nothing, but remove any file argument it is
+given.
+
+Asymptote run via mathicsscript will create an embeded postscript file out.eps
+which should be removed.
+"""
+import os
+import sys
+
+
+def main():
+    if len(sys.argv) > 1:
+        eps_file = sys.argv[1]
+        if os.path.exists(eps_file):
+            os.remove(eps_file)
+
+
+if __name__ == "__main__":
+    main()

setup.py

@@ -70,10 +70,11 @@ def read(*rnames):
             "mathicsscript/data/inputrc-unicode",
             "mathicsscript/user-settings.m",
             "mathicsscript/autoload/settings.m",
+            "mathicsscript/config.asy",
         ]
     },
     install_requires=[
-        "Mathics_Scanner>=1.2.2",
+        "Mathics_Scanner>=1.2.4",
         "Mathics3 >= 4.0.0,<4.1.0",
         "click",
         "colorama",
@@ -85,7 +86,12 @@ def read(*rnames):
         "mathics_pygments>=1.0.2",
         "term-background >= 1.0.1",
     ],
-    entry_points={"console_scripts": ["mathicsscript = mathicsscript.__main__:main"]},
+    entry_points={
+        "console_scripts": [
+            "mathicsscript = mathicsscript.__main__:main",
+            "fake_psviewer.py = mathicsscript.fake_psviewer:main",
+        ]
+    },
     extras_require=EXTRAS_REQUIRE,
     long_description=long_description,
     long_description_content_type="text/x-rst",