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gdl_kernel.py
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gdl_kernel.py
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from ipykernel.kernelbase import Kernel
from IPython.paths import locate_profile
from IPython.core.displaypub import publish_display_data
from pexpect import replwrap,EOF,spawn
import signal
from subprocess import check_output
import tempfile
import re
import os
from glob import glob
from shutil import rmtree
from base64 import b64encode
from distutils.spawn import find_executable
__version__ = '0.5'
version_pat = re.compile(r'Version (\d+(\.\d+)+)')
class GDLKernel(Kernel):
implementation = 'gdl_kernel'
implementation_version = __version__
language = 'GDL'
@property
def language_version(self):
try:
m = version_pat.search(self.banner)
return m.group(1)
except:
return "Version ?.?"
_banner = None
@property
def banner(self):
if self._banner is None:
try:
self._banner = check_output([self._executable, '--version']).decode('utf-8')
except:
self._banner = ''
return self._banner
language_info = {'name': 'gdl',
'codemirror_mode': 'idl',
'mimetype': 'text/x-idl',
'file_extension': '.pro'}
def __init__(self, **kwargs):
Kernel.__init__(self, **kwargs)
self._start_gdl()
try:
self.hist_file = os.path.join(locate_profile(),'gdl_kernel.hist')
except:
self.hist_file = None
self.log.warn('No default profile found, history unavailable')
self.max_hist_cache = 1000
self.hist_cache = []
def _start_gdl(self):
# Signal handlers are inherited by forked processes, and we can't easily
# reset it from the subprocess. Since kernelapp ignores SIGINT except in
# message handlers, we need to temporarily reset the SIGINT handler here
# so that GDL and its children are interruptible.
sig = signal.signal(signal.SIGINT, signal.SIG_DFL)
try:
self._executable = find_executable("gdl")
#self._child = spawn(self._executable+' --use-wx ',timeout = 300, encoding='utf-8')
self._child = spawn(self._executable,timeout = 300, encoding='utf-8')
self.gdlwrapper = replwrap.REPLWrapper(self._child,u"GDL> ",None)
finally:
signal.signal(signal.SIGINT, sig)
self.gdlwrapper.run_command("!quiet=1 & defsysv,'!inline',1 & !more=0".rstrip(), timeout=None)
# Compile GDL routines/functions
dirname = os.path.dirname(os.path.abspath(__file__))
self.gdlwrapper.run_command(".compile "+dirname+"/snapshot.pro",timeout=None)
def do_execute(self, code, silent, store_history=True, user_expressions=None,
allow_stdin=False):
if not code.strip():
return {'status': 'ok', 'execution_count': self.execution_count,
'payloads': [], 'user_expressions': {}}
elif (code.strip() == 'exit' or code.strip() == 'quit'):
self.do_shutdown(False)
return {'status':'abort','execution_count':self.execution_count}
elif (code.strip().startswith('.') or code.strip().startswith('@')):
# This is a GDL Executive command
output = self.gdlwrapper.run_command(code.strip(), timeout=None)
if not silent:
stream_content = {'name': 'stdout', 'text':output}
self.send_response(self.iopub_socket, 'stream', stream_content)
return {'status': 'ok', 'execution_count': self.execution_count,
'payloads': [], 'user_expressions': {}}
if code.strip() and store_history:
self.hist_cache.append(code.strip())
interrupted = False
tfile_code = tempfile.NamedTemporaryFile(mode='w+t',dir=os.path.expanduser("~"))
tfile_post = tempfile.NamedTemporaryFile(mode='w+t',dir=os.path.expanduser("~"))
plot_dir = tempfile.mkdtemp(dir=os.path.expanduser("~"))
plot_format = 'png'
postcall = """
if !D.NAME eq 'X' then begin
device,window_state=winds_arefgij
if !inline and total(winds_arefgij) ne 0 then begin
w_CcjqL6MA = where(winds_arefgij ne 0,nw_CcjqL6MA)
for i_KEv8eW6E=0,nw_CcjqL6MA-1 do begin
wset, w_CcjqL6MA[i_KEv8eW6E]
outfile_c5BXq4dV = '%(plot_dir)s/__fig'+strtrim(i_KEv8eW6E,2)+'.png'
ii_rsApk4JS = snapshot(outfile_c5BXq4dV)
wdelete
endfor
endif
endif else begin
if !D.NAME eq 'Z' then begin
device
if !inline and (total(tvrd()) ne 0.0) then begin
i_KEv8eW6E=0
outfile_c5BXq4dV = '%(plot_dir)s/__fig'+strtrim(i_KEv8eW6E,2)+'.png'
ii_rsApk4JS = snapshot(outfile_c5BXq4dV)
erase
endif
endif
endelse
end
""" % locals()
try:
tfile_code.file.write(code.rstrip()+"\na_adfadfw=1\nend")
tfile_code.file.close()
tfile_post.file.write(postcall.rstrip())
tfile_post.file.close()
output = self.gdlwrapper.run_command(".run "+tfile_code.name, timeout=None)
self.gdlwrapper.run_command(".run "+tfile_post.name,timeout=None)
# Publish images if there are any
images = [open(imgfile, 'rb').read() for imgfile in glob("%s/*.png" % plot_dir)]
display_data=[]
for image in images:
display_data.append({'image/png': b64encode(image).decode('ascii')})
for data in display_data:
self.send_response(self.iopub_socket, 'display_data',{'data':data,'metadata':{}})
except KeyboardInterrupt:
self.gdlwrapper.child.sendintr()
interrupted = True
self.gdlwrapper._expect_prompt()
output = self.gdlwrapper.child.before
except EOF:
output = self.gdlwrapper.child.before + 'Restarting GDL'
self._start_gdl()
finally:
tfile_code.close()
tfile_post.close()
rmtree(plot_dir)
if not silent:
stream_content = {'name': 'stdout', 'text':output}
self.send_response(self.iopub_socket, 'stream', stream_content)
if interrupted:
return {'status': 'abort', 'execution_count': self.execution_count}
try:
exitcode = int(self.run_command('print,0').rstrip())
except Exception:
exitcode = 1
if exitcode:
return {'status': 'error', 'execution_count': self.execution_count,
'ename': '', 'evalue': str(exitcode), 'traceback': []}
else:
return {'status': 'ok', 'execution_count': self.execution_count,
'payloads': [], 'user_expressions': {}}
def do_history(self, hist_access_type, output, raw, session=None,
start=None, stop=None, n=None, pattern=None, unique=False):
if not self.hist_file:
return {'history': []}
if not os.path.exists(self.hist_file):
with open(self.hist_file, 'wb') as f:
f.write('')
with open(self.hist_file, 'rb') as f:
history = f.readlines()
history = history[:self.max_hist_cache]
self.hist_cache = history
self.log.debug('**HISTORY:')
self.log.debug(history)
history = [(None, None, h) for h in history]
return {'history': history}
def do_shutdown(self, restart):
self.log.debug("**Shutting down")
self.gdlwrapper.child.kill(signal.SIGKILL)
if self.hist_file:
with open(self.hist_file,'wb') as f:
data = '\n'.join(self.hist_cache[-self.max_hist_cache:])
f.write(data.encode('utf-8'))
return {'status':'ok', 'restart':restart}
if __name__ == '__main__':
from ipykernel.kernelapp import IPKernelApp
IPKernelApp.launch_instance(kernel_class=GDLKernel)