On 22/4/2006, at 0:36, Nick Stenning wrote:
[...] My question is this: would it be feasible to implement this in TM, either in the core or as a plugin
TextMate sort of already has this in the form of soft wrap.
So what you need is only to post/pre-process letters before/after handing them over to TextMate (i.e. merge quoted lines before, and do hard wrap after, inserting a trailing space).