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python: suggest installing GraphViz when dot is not found

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This fixes an issue mentioned in #375.

* python/spot/aux.py (str_to_svg): Catch a missing 'dot' and instruct
the user to install GraphViz.
* THANKS: Add reporter.
This commit is contained in:
Alexandre Duret-Lutz 2019-01-25 23:16:46 +01:00
parent 573c593fa2
commit 188d210521
2 changed files with 13 additions and 5 deletions
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1
THANKS
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@ -24,6 +24,7 @@ Jean-Michel Couvreur
Jean-Michel Ilié Jean-Michel Ilié
Jeroen Meijer Jeroen Meijer
Joachim Klein Joachim Klein
Juan Tzintzun
Juraj Major Juraj Major
Kristin Y. Rozier Kristin Y. Rozier
Martin Dieguez Lodeiro Martin Dieguez Lodeiro

9
python/spot/aux.py
View file

@ -1,5 +1,5 @@
# -*- coding: utf-8 -*- # -*- coding: utf-8 -*-
# Copyright (C) 2016 Laboratoire de Recherche et Développement de l'Epita # Copyright (C) 2016, 2019 Laboratoire de Recherche et Développement de l'Epita
# (LRDE). # (LRDE).
# #
# This file is part of Spot, a model checking library. # This file is part of Spot, a model checking library.
@ -51,10 +51,17 @@ def str_to_svg(str):
""" """
Send some text to dot for conversion to SVG. Send some text to dot for conversion to SVG.
""" """
try:
dot = subprocess.Popen(['dot', '-Tsvg'], dot = subprocess.Popen(['dot', '-Tsvg'],
stdin=subprocess.PIPE, stdin=subprocess.PIPE,
stdout=subprocess.PIPE, stdout=subprocess.PIPE,
stderr=subprocess.PIPE) stderr=subprocess.PIPE)
except FileNotFoundError:
print("The command 'dot' seems to be missing on your system.\n"
"Please install the GraphViz package "
"and make sure 'dot' is in your PATH.", file=sys.stderr)
raise
stdout, stderr = dot.communicate(str) stdout, stderr = dot.communicate(str)
if stderr: if stderr:
print("Calling 'dot' for the conversion to SVG produced the message:\n" print("Calling 'dot' for the conversion to SVG produced the message:\n"