Anyway you have over complicated yourself.

Also you don't call the shim tag <icon-shim> you call it <icon> but in a
different namespace. That makes migration simples

We should chat tomorrow

On Tuesday, 1 July 2014, Stephen Connolly <[email protected]>
wrote:

> You can't update core to use the plugin, as circular dependency... So as
> soon as you want to use your tag in core your plugin is... Oh look its a
> shim!
>
> Would a rose by any other name smell as sweet?
>
> On Monday, 30 June 2014, Tom Fennelly <[email protected]
> <javascript:_e(%7B%7D,'cvml','[email protected]');>> wrote:
>
>> Hi.
>> We're in the process of creating a new <icon> in the hope of allowing
>> more control over icons in the UI [1]. As part of that, we want to allow
>> plugins that adopt this new tag to remain backward compatible with older
>> versions of Jenkins.
>>
>> Up to now, the convention seems to have been that all core jelly taglibs
>> (forms etc) live in Jenkins core and plugins get them from there:
>>
>>
>> <https://lh5.googleusercontent.com/-bnwMqmtmK4I/U7HdvP9_azI/AAAAAAAABIg/9ZtjRLr_kQU/s1600/Screenshot+2014-06-30+22.54.39.png>
>> Of course, this means that a given plugin has a dependency on a
>> particular version of Jenkins on which it is installed.  For that reason,
>> we talked [1] about creating "shim" plugin.  This would be a plugin that
>> defines an intermediate icon tag (maybe call it <icon-shim>) that has
>> Jenkins version switching code inside it i.e.
>>
>> if (jenkinsVersion >= 1.571) {
>>
>> // use new <l:icon> tag ...
>>
>> } else {
>>
>> // use display icon in traditional way (as <img>)
>>
>> }
>>
>>
>>
>>
>> <https://lh3.googleusercontent.com/-po0x1R8HUj0/U7HioP8dtXI/AAAAAAAABIw/wBNp2arHqD8/s1600/Screenshot+2014-06-30+23.09.04.png>
>>
>> This all seemed a bit clumsy/ugly/messy to me, requiring multiple icon
>> related tags... plugin release management for the shim plugin etc etc.  So
>> I decided to try creating a simple <icon> taglib jar (i.e. not putting the
>> <icon> taglib in Jenkins Core).  Then, Jenkins Core and whatever plugins
>> wish to upgrade (to using the new <icon> tag) simple add this new taglib as
>> a dependency, independently of each other.  So long as the <icon> taglib
>> does not use anything in a newer release of Jenkins, then the plugin should
>> work all the way back down the Jenkins releases:
>>
>>
>> <https://lh6.googleusercontent.com/-OMgCDihqezQ/U7HjQ9oJoUI/AAAAAAAABI4/pVCDvV2M2TI/s1600/Screenshot+2014-06-30+23.09.17.png>
>>
>> I have some code here [2].  It works fine from a Jenkins Core
>> perspective.  I'm going to change the Credentials plugin now and test that
>> it works on new and old versions of Jenkins.  I'm fairly confident it will.
>>  The icon taglib is currently in an "icon" module of the root the project.
>>  I know that's probably not a good long-term location - if the idea sticks,
>> we can easily move it to a new home.
>> So.... what's "wrong" with doing it this way Vs using a "shim" plugin ? :)
>>
>> [1]
>> https://groups.google.com/forum/?hl=en#!topic/jenkinsci-dev/GOiQdvctBB0
>> [2] https://github.com/tfennelly/jenkins/compare/icon-tag
>>
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>
>
> --
> Sent from my phone
>


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