[Koha-bugs] [Bug 7709] New: Cover Images Template plugin

[bugzilla-daemon at bugs.koha-community.org]

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=7709

          Priority: P5 - low
 Change sponsored?: ---
            Bug ID: 7709
          Assignee: oleonard at myacpl.org
           Summary: Cover Images Template plugin
        QA Contact: koha.sekjal at gmail.com
          Severity: enhancement
    Classification: Unclassified
                OS: All
          Reporter: koha.sekjal at gmail.com
          Hardware: All
            Status: NEW
           Version: master
         Component: Templates
           Product: Koha

As we add more and more sources for cover images, and use them in more and more
places, it becomes increasingly difficult to keep the code synchronized.  I
propose we move the logic of picking and displaying a cover image out of the
templates and into a T:T Plugin.

Usage would be like:

[% biblionumber | KohaCoverImage %]

I say biblionumber instead of normalised_isbn (which is common for most all
external services) because it will also work for local cover images.  This does
add the overhead of having to look up the normalized ISBN again, even if we
already had it on the page.  Anyone more familiar with passing variables
(particularly hashes) to T:T plugins, would be welcome to step up here.

This would simplify out templates by several dozen lines of code, and provide a
uniform logic for selection.  New selection methods, as well as new sources,
would be easy to add, since they'd only need to be coded in one place.

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