Remove dependency on DISPLAY / X

[mw55309]

So it turns out if you don't have X enabled / forwarded and $DISPLAY is not set, then nothing in sourmash works, even the functions that don't plan on plotting anything

[mw55309]

E.g.

~$ sourmash
Failed to connect to Mir: Failed to connect to server socket: No such file or directory
Unable to init server: Could not connect: Connection refused
Failed to connect to Mir: Failed to connect to server socket: No such file or directory
Unable to init server: Could not connect: Connection refused

(sourmash:21985): Gdk-CRITICAL **: gdk_cursor_new_for_display: assertion 'GDK_IS_DISPLAY (display)' failed
Traceback (most recent call last):
File "/usr/local/bin/sourmash", line 9, in
load_entry_point('sourmash==1.0', 'console_scripts', 'sourmash')()
File "/usr/lib/python2.7/dist-packages/pkg_resources/init.py", line 542, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "/usr/lib/python2.7/dist-packages/pkg_resources/init.py", line 2569, in load_entry_point
return ep.load()
File "/usr/lib/python2.7/dist-packages/pkg_resources/init.py", line 2229, in load
return self.resolve()
File "/usr/lib/python2.7/dist-packages/pkg_resources/init.py", line 2235, in resolve
module = import(self.module_name, fromlist=['name'], level=0)
File "/usr/local/lib/python2.7/dist-packages/sourmash_lib/main.py", line 10, in
from sourmash_lib import fig as sourmash_fig
File "/usr/local/lib/python2.7/dist-packages/sourmash_lib/fig.py", line 8, in
import pylab
File "/usr/local/lib/python2.7/dist-packages/matplotlib-2.0.2-py2.7-linux-x86_64.egg/pylab.py", line 1, in
from matplotlib.pylab import *
File "/usr/local/lib/python2.7/dist-packages/matplotlib-2.0.2-py2.7-linux-x86_64.egg/matplotlib/pylab.py", line 257, in
from matplotlib import cbook, mlab, pyplot as plt
File "/usr/local/lib/python2.7/dist-packages/matplotlib-2.0.2-py2.7-linux-x86_64.egg/matplotlib/pyplot.py", line 115, in
_backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
File "/usr/local/lib/python2.7/dist-packages/matplotlib-2.0.2-py2.7-linux-x86_64.egg/matplotlib/backends/init.py", line 32, in pylab_setup
globals(),locals(),[backend_name],0)
File "/usr/local/lib/python2.7/dist-packages/matplotlib-2.0.2-py2.7-linux-x86_64.egg/matplotlib/backends/backend_gtk3agg.py", line 11, in
from . import backend_gtk3
File "/usr/local/lib/python2.7/dist-packages/matplotlib-2.0.2-py2.7-linux-x86_64.egg/matplotlib/backends/backend_gtk3.py", line 54, in
cursors.MOVE : Gdk.Cursor.new(Gdk.CursorType.FLEUR),
TypeError: constructor returned NULL

[ctb]

Hi @mw55309, if you do this: echo 'backend : Agg' > matplotlibrc it should disable that. This is a known problem that I patch in our latest tutorial, https://sourmash.readthedocs.io/en/latest/tutorials.html but hasn't made it into the issue tracker - thanks for submitting it!

…

--- I also note that you are using sourmash 1.0, I'd suggest updating to the latest github master (see tutorial for instructions) as we are nearing a release and the functionality has been vastly expanded. Also, this problem should only crop up if you try to plot, in the more recent versions :). (I was really confused at first because I haven't run into this problem outside of plot for a while now!) best, --titus

[ctb]

This seems to no longer be an issue with newer matplotlib, but we should add to known issues.

[ctb]

closed by #419.