MobileRead Forums - View Single Post - Metadata Plugboards no longer preserve non-breaking spaces

chaley · 12-24-2021, 04:42 PM

My guess, and this is just a guess, is that the behavior started when you upgraded to calibre 5, at which point the python regular expression system changed.

Calibre has *forever* (since at least 2010) replaced sequences of spaces in template results with a single space. I think, but don't know, that python 3 includes non-breaking-spaces in the set of space characters while python 2 did not. I did not test this theory.

You can avoid removing sequences of spaces by using General Program Mode templates. For example, the template

Code:

program: $authors

doesn't remove internal non-breaking spaces. The template

Code:

{authors}

does remove them. The reason: internal spacing in GPM templates is under the control of the template writer while spacing in non-GPM templates can vary depending on template evaluation.

EDIT: Just to avoid some questions: the current behavior won't change back to what it was.

12-24-2021, 04:42 PM	#2
chaley Grand Sorcerer Posts: 12,447 Karma: 8012886 Join Date: Jan 2010 Location: Notts, England Device: Kobo Libra 2	My guess, and this is just a guess, is that the behavior started when you upgraded to calibre 5, at which point the python regular expression system changed. Calibre has forever (since at least 2010) replaced sequences of spaces in template results with a single space. I think, but don't know, that python 3 includes non-breaking-spaces in the set of space characters while python 2 did not. I did not test this theory. You can avoid removing sequences of spaces by using General Program Mode templates. For example, the template Code: program: $authors doesn't remove internal non-breaking spaces. The template Code: {authors} does remove them. The reason: internal spacing in GPM templates is under the control of the template writer while spacing in non-GPM templates can vary depending on template evaluation. EDIT: Just to avoid some questions: the current behavior won't change back to what it was.