#13624: KeyError raised by GraphLatex.dot2tex_picture when edge_labels=True
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Reporter: slabbe | Owner: tbd
Type: defect | Status: needs_work
Priority: major | Milestone: sage-5.9
Component: packages: optional | Resolution:
Keywords: dot2tex, graph drawing | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Nicolas M. Thiéry | Merged in:
Dependencies: | Stopgaps:
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Comment (by nthiery):
Replying to [comment:27 ncohen]:
> > See the method layout_graphviz in generic_graph.
>
> Do we both agree that this is nowhere sufficient ?
>
> Here is what happens when some code that requires graphviz (and which
does not use layout_graphviz) is executed wihout graphviz installed
>
> {{{
> sage: sage: import dot2tex
# optional - dot2tex graphviz ## line 10 ##
> sage: sage: output = dot2tex.dot2tex(graph, format="positions",
prog="neato") # optional - dot2tex graphviz ## line 11 ##
> ERROR Could not locate Graphviz binaries
> ERROR Failed to create xdotdata. Is Graphviz installed?
> ERROR Failed to parse the input data. Is it a valid dot file?
> Try to input xdot data directly. Example:
> dot -Txdot file.dot | dot2tex > file.tex
>
> If this does not work, check that you have an updated version of
PyParsing and
> Graphviz. Users have reported problems with old versions. You can also
run
> dot2tex in debug mode using the --debug option:
> dot2tex --debug file.dot
> A file dot2tex.log will be written to the current directory with
detailed
> information useful for debugging.
> An exception has occurred, use %tb to see the full traceback.
>
> SystemExit: 1
>
> To exit: use 'exit', 'quit', or Ctrl-D
> }}}
>
> The error message should redirect the user toward a way to install
graphviz I guess. And I have never met "`SystemExit`"
I agree this is ugly, but that's a problem with dot2tex, not with Sage
(feel free to report!). Any Sage code using dot2tex should call
assert_have_doc2tex.
> By the way, do we really need pyparsing ? I thought this did not
> belong to Sage, and I needed it a couple of days ago.
No clue.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13624#comment:29>
Sage <http://www.sagemath.org>
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