Template: avoid multiple images?

[ownedbycats]

Originally Posted by ownedbycats

Question: I'm converting my fanfic column icon rules to a single advanced rule.

program: 
   f = field('#fanficcat');
   strcat
   (
    contains(f, "Dragon Age: Origins", 'dragonageorigins.png', ''), 
    contains(f, "Half-Life", 'halflife.png', ''), 
    contains(f, "Mass Effect", 'masseffect.png', ''), 
    contains(f, "The Elder Scrolls", 'theelderscrolls.png', ''), 
    contains(f, "Pokémon", 'pokemon.png', ''), 
    contains(f, "Portal", 'portal.png', ''), 
   )

It works except for when there's multiple values (#fanficcat is a tag-like). Clicking on one of the crossovers in the book list and opening the template editor shows "masseffect.pngpokemon.png".

What should I do?

Another question regarding this one:

 strcat
   (
    contains(f, "foo", 'foobar.png:', ''), 
    contains(f, "bar", 'foobar.png:', ''),  
   )

If a book has both "foo" and "bar", how do I get it to display foobar.png only once without using first_non_empty?

[chaley]

Moderator Notice
Moved to separate thread

In general, you should make a new thread for questions about existing templates. Or use the older thread, for that matter.

[chaley]

Originally Posted by ownedbycats

Another question regarding this one:

 strcat
   (
    contains(f, "foo", 'foobar.png:', ''), 
    contains(f, "bar", 'foobar.png:', ''),  
   )

If a book has both "foo" and "bar", how do I get it to display foobar.png only once without using first_non_empty?

First, why not use first_non_empty()? It does what you seem to want with the added benefit of priority. For example

program:
   f = field('#fanficcat');
   strcat
   (
    contains(f, "Dragon Age: Origins", 'dragonageorigins.png', ''), 
    contains(f, "Half-Life", 'halflife.png', ''), 
    contains(f, "Mass Effect", 'masseffect.png', ''), 
    contains(f, "The Elder Scrolls", 'theelderscrolls.png', ''), 
    contains(f, "Pokémon", 'pokemon.png', ''), 
    contains(f, "Portal", 'portal.png', ''), 
    first_non_empty(
        contains(f, "foo", 'foobar.png:', ''), 
        contains(f, "bar", 'foobar.png:', ''),  
       )
   )

This solves the problem you pose without using first_non_empty():

    contains(f, "^(foo|bar)$", 'foobar.png:', '')

Note the ^ and $ characters, called anchors in regex. Without anchors, contains will match the pattern anywhere in the string. For example, "bar" will match "wheelbarrow" and "Portal" will match "Starportal". My guess is that all of your comparisons should use anchors, e.g., '^Portal$'.

[ownedbycats]

That'll work.

In my case, I was adding generic media-type icons (e.g. a book or a game controller or a roll of film) to categories if I didn't have a more specific icon. It was appearing multiple times for crossovers though.

In hindsight, I also think I could've made a separate rule with first_non_empty.

Thank you