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[utils] Improve prepend_extension
Now `ext` is appended to filename if real extension != expected extension.
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@ -1349,9 +1349,12 @@ def parse_duration(s):
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return res
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def prepend_extension(filename, ext):
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def prepend_extension(filename, ext, expected_real_ext=None):
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name, real_ext = os.path.splitext(filename)
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return '{0}.{1}{2}'.format(name, ext, real_ext)
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return (
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'{0}.{1}{2}'.format(name, ext, real_ext)
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if not expected_real_ext or real_ext[1:] == expected_real_ext
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else '{0}.{1}'.format(filename, ext))
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def check_executable(exe, args=[]):
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