Convert GPM to PTM - Emblem Rule

[Comfy.n]

Hi!

I have some emblem rules like these, for the cover grid:

program:
test($#last_viewed, 'lastop-dark.png', '');

and

program:
test(contains(field('formats'), "EPUB", '1', ''), 'logo epub.png', '');

Is it possible and advisable to convert them to PTM?

[chaley]

Possible? certainly.

Advisable? depends.

• PTM templates will be faster, but in the case of emblems it probably doesn't matter all that much. The template is evaluated when a cover is shown, with the result cached until metadata is changed. You might see a performance difference scrolling at full speed through the covers, but I doubt it. However, even very small performance improvements can matter if the template can be used when sorting or searching.
• The first template is simple enough where we are talking about nanoseconds of difference, perhaps a 100 or so. The second will see more improvement because PTM can deal directly with the list of formats without converting it to a comma-separated list, and because it avoids using a regular expression search.
• You should understand the template well enough to maintain it.

As for the templates themselves ...

program:
test($#last_viewed, 'lastop-dark.png', '');

What column type is #last_viewed? The template below works if it is a date. Tags-like fields would use a different return statement because for empty values book.get() returns an empty list instead of 'None'.

python:
def evaluate(book, context):
	date = book.get('#mydate')
	return 'lastop-dark.png' if date is not None else ''

As for

program:
test(contains(field('formats'), "EPUB", '1', ''), 'logo epub.png', '');

This is the equivalent PTM template:

python:
def evaluate(book, context):
	formats = book.get('formats')
	return 'logo epub.png' if formats is not None and 'EPUB' in formats else ''

[Comfy.n]

Originally Posted by chaley

What column type is #last_viewed? The template below works if it is a date.

Exactly, it's a date column updated by Job Spy plugin upon 'viewing' a title. Thanks so much for the templates! I just installed them and the second seems to work faster for the formats' emblems.

• You should understand the template well enough to maintain it.

Noted.

I've attached the icons I'm using for emblems, maybe someone finds them useful.