Best way to test for zsh features?

[john_oshea@xxxxxxxxxxxx]

Hi all,

What's the best/cleanest/most "correct" way of checking for zsh features 
in an .zshrc? I've started to use vcs_info as part of my prompt, which 
works wonderfully in zsh's new enough to have that available, but gives 
me "function definition file not found" on machines with older zsh 
installations (that I'm unable to upgrade).

Testing $ZSH_VERSION springs to mind, but I'm wondering if there's a way 
to do the equivalent of vim's "has('feature_x')" to see if the zsh I'm 
in has vcs_info available?

Apologies in advance if I'm missing something very obvious...


Thanks

John

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John O'Shea
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