Preventing Calibre from rewriting custom HTML in recipe?

simplisity · 09-13-2017, 12:17 PM

I have a recipe which outputs custom HTML. When I convert it to EPUB or MOBI in Calibre, a lot of the HTML gets rewritten. Specifically, a lot of the HTML class names get rewritten. For example

Code:

<div class="foobar">

will get rewritten to

Code:

<div class="calibre6">

.

Is there any way to completely prevent Calibre from rewriting or modifying my HTML?

Thank You

kovidgoyal · 09-13-2017, 01:47 PM

No, conversion always flattens CSS.

simplisity · 09-13-2017, 05:40 PM

kovidgoyal:

Thank you for your help. If I wanted to disable the CSS flattening in the Calibre code, should I start by looking at the MOBI and EPUB converter code? Or, should I look somewhere else?

kovidgoyal · 09-13-2017, 10:16 PM

The conversion pipeline in general depends on CSS flattening. DIsbaling it is no trivial task.

simplisity · 09-14-2017, 01:01 PM

kovidgoyal:

Is there at least some way to remove the padding, margin, and bullet points from a "<ul>" tag? Right now, I have this:

Code:

extra_css = (
    """
    #foo ul {
        padding-left: 0px;
        margin-left: 0px;
        list-style-type: none;
    }
    """
)

By the time it gets on the kindle, it looks like these CSS rules get stripped out. Is there some workaround to just get this working?

Thanks for your help.

JSWolf · 09-14-2017, 01:03 PM

Use the editor to load the HTML/CSS and split it as needed and then edit as needed and you've got an ePub as you want.

kovidgoyal · 09-14-2017, 09:02 PM

If you are converting to MOBI, it does not support any CSS. And if you are converting periodicals, then you have to convert to MOBI, since AZW3, which does support CSS, does not support periodicals.

simplisity · 09-15-2017, 01:16 AM

kovidgoyal:

That is very helpful information. Thank you. Is there a technique by which I could create a Recipe which will not behave as a periodical, so that it can be used with AZW3?

kovidgoyal · 09-15-2017, 01:42 AM

Set your output format to EPUB. Then convert the EPUB to azw3, or use the command line ebook-convert tool which can convert .recipe files directly to any format.

09-13-2017, 12:17 PM	#1
simplisity Junior Member Posts: 5 Karma: 10 Join Date: Jun 2017 Device: Kindle	Preventing Calibre from rewriting custom HTML in recipe? I have a recipe which outputs custom HTML. When I convert it to EPUB or MOBI in Calibre, a lot of the HTML gets rewritten. Specifically, a lot of the HTML class names get rewritten. For example Code: <div class="foobar"> will get rewritten to Code: <div class="calibre6"> . Is there any way to completely prevent Calibre from rewriting or modifying my HTML? Thank You

09-14-2017, 01:01 PM	#5
simplisity Junior Member Posts: 5 Karma: 10 Join Date: Jun 2017 Device: Kindle	kovidgoyal: Is there at least some way to remove the padding, margin, and bullet points from a "<ul>" tag? Right now, I have this: Code: extra_css = ( """ #foo ul { padding-left: 0px; margin-left: 0px; list-style-type: none; } """ ) By the time it gets on the kindle, it looks like these CSS rules get stripped out. Is there some workaround to just get this working? Thanks for your help.

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09-13-2017, 01:47 PM	#2
kovidgoyal creator of calibre Posts: 43,842 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	No, conversion always flattens CSS.

09-13-2017, 05:40 PM	#3
simplisity Junior Member Posts: 5 Karma: 10 Join Date: Jun 2017 Device: Kindle	kovidgoyal: Thank you for your help. If I wanted to disable the CSS flattening in the Calibre code, should I start by looking at the MOBI and EPUB converter code? Or, should I look somewhere else?

09-13-2017, 10:16 PM	#4
kovidgoyal creator of calibre Posts: 43,842 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	The conversion pipeline in general depends on CSS flattening. DIsbaling it is no trivial task.

09-14-2017, 01:03 PM	#6
JSWolf Resident Curmudgeon Posts: 73,891 Karma: 128597114 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	Use the editor to load the HTML/CSS and split it as needed and then edit as needed and you've got an ePub as you want.

09-14-2017, 09:02 PM	#7
kovidgoyal creator of calibre Posts: 43,842 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	If you are converting to MOBI, it does not support any CSS. And if you are converting periodicals, then you have to convert to MOBI, since AZW3, which does support CSS, does not support periodicals.

09-15-2017, 01:16 AM	#8
simplisity Junior Member Posts: 5 Karma: 10 Join Date: Jun 2017 Device: Kindle	kovidgoyal: That is very helpful information. Thank you. Is there a technique by which I could create a Recipe which will not behave as a periodical, so that it can be used with AZW3?

09-15-2017, 01:42 AM	#9
kovidgoyal creator of calibre Posts: 43,842 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Set your output format to EPUB. Then convert the EPUB to azw3, or use the command line ebook-convert tool which can convert .recipe files directly to any format.