This works on both Windows,
and Linux,
from ipykernel.kernelbase import Kernel
from subprocess import check_output
import os.path
import re
import signal
from pexpect import popen_spawn
import pexpect
import platform
def iswindows():
return platform.system() == "Windows"
__version__ = "0.1.0"
class GSWrapper:
"""
Wrap Ghostscript executable using pexpect
"""
def __init__(self):
"""
todo: config cmd can be 'gs', 'gs-X11', etc.
"""
if iswindows():
self.cmd = 'gswin64c -dNOSAFER'
self.p = popen_spawn.PopenSpawn(self.cmd)
else:
self.cmd = 'gs -dNOSAFER'
self.p = pexpect.spawn(self.cmd)
# maybe input/output to gs is always 'ascii'?
self.encoding = "utf8"
pattern1 = b"GS>"
self.p.expect(re.compile(pattern1))
assert(self.p.after == b"GS>")
def run(self, code):
"""
Execute 'code' in session.
newline is appended
"""
prompt = re.compile(b'GS(>|<\d+>)')
code = code + "\n"
self.p.send(code)
self.p.expect(prompt)
before = self.p.before.decode(self.encoding)
after = self.p.after.decode(self.encoding)
if not iswindows():
code = code.strip()
before = before[len(code):]
if len(before)==0:
r = after
else:
r = before + after
# .after is always the prompt itself. ?
# eg: b'GS>'
#
# could parse to get stack size
# 'GS>', 'GS<1>', ...
#
return r.strip()
Note that I have added the -dNOSAFER option to cmd to allow scripts to run other scripts.
e.g.
(utils.ps) run
This works on both Windows,
and Linux,
Note that I have added the -dNOSAFER option to cmd to allow scripts to run other scripts.
e.g.
(utils.ps) run