Re: Expression maps and "normal"

On Thu, 20 Oct 2011, David Fishburn wrote:

> [...]
>
> So basically we have a omap (expression map) on y which call
> YRMapsExpression:
> o y YRMapsExpression("<SNR>107_", "y")
>
> When I hit yy, YRMapsExpression is called, and it tacks on the call to:
> nnoremap <silent> <SID>yrrecord :call YRRecord3( myMotionParameter )<cr>
> let cmds .= a:sid. "yrrecord"
> return cmds
>
> So, when this executes, it also executes the call to YRRecord3().
>
> Other expression maps are created as well:
> ye
> yw
> yb
> ...
>
> Basically, in YRRecord3(), I want to know that "ye" was called. Right
> now, I have no idea what mapping triggered the call to this function.
>
> I could simply create a script variable and in YRMapsExpression do this:
> let s:yr_last_motion = 'ye'
>
> Then in YRRecord3(), I have a reference to it.
>
> What I was worried about in this approach is the nesting of cmds and
> mappings, and the issue of what happens when I run macros.
>
> I wasn't sure I would have a proper stack of calls when only using a
> script variable.

I don't quite grok the full context, but why not make it explicitly a
stack? Instead of:

let s:yr_last_motion = 'ye'

do:

call add(s:motion_context, 'ye')

and (when the info is consumed):

call remove(s:motion_context, -1)

--
Best,
Ben

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