The functionality of --(chapter-)filter and --(chapter-)range are now
also exposed as the following config-file options:
- extractor.*.image-filter
- extractor.*.image-range
- extractor.*.chapter-filter
- extractor.*.chapter-range
TODO: update configuration.rst
A format string now gets parsed only once instead of re-parsing it each
time it is applied to a set of data.
The initial parsing causes directory path creation to be at about 2x
slower than before, since each format string there is used only once,
but building a filename, the more common operation, is at least 2x
faster. The "directory slowness" cancels at about 5 filenames and
everything above that is significantly faster.
The L option allows for the contents of a format field to be replaced
with <replacement> if its length is greater than <maxlen>.
Example:
{f:L5/too long/} -> "foo" (if "f" is "foo")
-> "too long" (if "f" is "foobar")
(#92) (#94)
It is now possible to slice string (or list) values of format string
replacement fields with the same syntax as in regular Python code.
"{digits}" -> "0123456789"
"{digits[2:-2]}" -> "234567"
"{digits[:5]}" -> "01234"
The optional third parameter (step) has been left out to simplify things.
calling 'abort()' in a filter aborts the current extractor run
in a cleaner way than using something like 1/0, which
causes an error message to be printed
Missing or undefined keywords will now be replaced with the value
set for 'keywords-default'. The default is Python's 'None', which
is equivalent to setting this option to JSON's 'null'.
This allows for image filtering via Python expressions by the same
metadata that is also used to build filenames (--list-keywords).
The usually shunned eval() function is used to evaluate
filter-expressions, but it seemed quite appropriate in this case and
shouldn't introduce any new security issues, as any attacker that could do
> gallery-dl --filter "delete-everything()" ...
could as well do
> python -c "delete-everything()"
