[issue172] ValueError: unsupported format character '-' (0x2d) at index 9

[Ed Swierk at Labix Tracker]

Ed Swierk <eswierk at cs.stanford.edu> added the comment:

When TextProgress.setScreenWidth is passed a width of 0, it generates a bogus 
format string containing a negative number.

The attached patch works around this bug by forcing the width to at least 70 
characters.

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nosy: +eswierk

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Labix issue tracker <tracker at labix.org>
<http://tracker.labix.org/issue172>
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