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Delay the fc-list warning by 5 seconds #7532

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Delay the fc-list warning by 5 seconds #7532

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2a90d95
Delay the fc-list warning by 5 seconds
astrofrog Nov 29, 2016
b1bf847
Make sure TimeoutExpired is defined
astrofrog Nov 29, 2016
5ac3d36
Only show the warning after a 5-second delay on Python 3
astrofrog Nov 30, 2016
e13d9db
Avoid duplicate message
astrofrog Nov 30, 2016
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Delay the fc-list warning by 5 seconds
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@astrofrog
astrofrog committed Nov 29, 2016
commit 2a90d9519d4d1d9cc3810456e988b6b8c58d639e
10 changes: 8 additions & 2 deletions lib/matplotlib/font_manager.py
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Expand Up @@ -273,11 +273,17 @@ def get_fontconfig_fonts(fontext='ttf'):

fontfiles = {}
try:
warnings.warn('Matplotlib is building the font cache using fc-list. This may take a moment.')
pipe = subprocess.Popen(['fc-list', '--format=%{file}\\n'],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
output = pipe.communicate()[0]
# We emit a warning if the process has not completed after 5 seconds.
# We avoid showing it before since if this takes < 5 seconds, the user
# probably won't notice.
try:
output = pipe.communicate(timeout=5)[0]
except subprocess.TimeoutExpired:
warnings.warn('Matplotlib is building the font cache using fc-list. This may take a moment.')
output = pipe.communicate()[0]
except (OSError, IOError):
# Calling fc-list did not work, so we'll just return nothing
return fontfiles
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