I want to be able to make custom postfix completions, but I can't seem to find anywhere to do so and haven't been able to find anything online. Anyone know how?
Now you can. I've written a plugin for IDEA that allows you to create your own postfix templates. It's called Custom Postfix Templates:
You can't.
Well, postfix feature is basically Postfix Plugin for IntelliJ(now integrated). All templates are just compiled code, as you can see here:
https://github.com/controlflow/intellij-postfix/tree/master/src/org/jetbrains/postfixCompletion/templates
Sadly, there isn't such easy xml like configuration. :(
With the latest release i.e IntelliJ IDEA 2018.1, you can. That too, without using any plugin. It's embedded into the IDE itself.
https://blog.jetbrains.com/idea/2018/02/intellij-idea-2018-1-eap-partial-git-commits-and-more/
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