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Better error message for text less DJVU files

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Kovid Goyal 2020-02-18 21:24:55 +05:30
parent bb733041cc
commit f040283261
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1 changed files with 5 additions and 1 deletions
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6
src/calibre/ebooks/conversion/plugins/djvu_input.py
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@ -28,8 +28,12 @@ class DJVUInput(InputFormatPlugin):
from calibre.ebooks.djvu.djvu import DJVUFile
x = DJVUFile(stream)
x.get_text(stdout)
raw_text = stdout.getvalue()
if not raw_text:
raise ValueError('The DJVU file contains no text, only images, probably page scans.'
' calibre only supports conversion of DJVU files with actual text in them.')
html = convert_basic(stdout.getvalue().replace(b"\n", b' ').replace(
html = convert_basic(raw_text.replace(b"\n", b' ').replace(
b'\037', b'\n\n'))
# Run the HTMLized text through the html processing plugin.
from calibre.customize.ui import plugin_for_input_format