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I understand that evil-ex-define-cmd allow me create my own ex commands.

Although in Vim, you were able to narrow down the search by doing something like

:h <term>

I'm not sure how to accomplish the same in evil, or if this is even possible.

  • I should specify: What I want to do is to take the arguments after :h and pass it into the function bound by evil-ex-define-cmd (this is currently helm). Whether that is a useful activity is best left for another discussion – Wagk Mar 26 '17 at 7:01
  • Look at the definition of ex commands reading in extra arguments. I'll whip up a complete example later. – wasamasa Mar 26 '17 at 7:43
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An ex command is just another function. Evil defines a few extra interactive codes to retrieve what you've passed to it, <a> is the most generic one and returns the text after the command as is:

(evil-define-command my-help (arg)
  (interactive "<a>")
  (message "ARG: %s" arg))

(evil-ex-define-cmd "h[elp]" 'my-help)

:h foo will display "ARG: foo" in the echo area. Extend this as you need for whatever you're doing with Helm.

  • Thanks for the answer, though it appears that helm does not allow me to initialize searches like that – Wagk Mar 27 '17 at 3:48

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