[TxMt] Re: Conditional insertion with nested placeholder.

[Allan Odgaard]

On 12 Nov 2008, at 10:28, Matt Foster wrote:

> [...]
> and what I'd like to have is something more like this:
> for [${1:n} ${2:=} ${2/(in)|(.+)/(?1:"$3":$3\:$4)/}] $0
>
> The conditional expansion seems to work ok, but unfortunately the
> placeholders inside it don't appear.

You can’t generate new placeholders via mirrors.

We fake it in a few snippets by having all the placeholders and then  
use transformations to make it appear as if they are moving.

So something like this:

    for [${1:n} ${2:=} ${2/(in)|.+/(?1:")/}$3${2/(in)|.+/(?1:":\:)/}$4]

So incase of ‘in’ you get an extra tab stop after ", but otherwise it  
does what you want. You can probably improve the behavior by rewriting  
the latter transformation into two transformations, one that inserts  
the : and the other which inserts the ", then place $4 before the one  
that inserts ", that way, when the loop uses ‘in’ it’ll have $4  
immidiately after $3 (no character inbetween) and TextMate _should_  
skip it when you tab away from $3 (making $4 appear invisible).