On Aug 30, 2012, at 8:55 PM, Ramakrishnan Muthukrishnan wrote: > On Fri, Aug 31, 2012 at 3:22 AM, John Clements > <cleme...@brinckerhoff.org> wrote: >> >> On Aug 30, 2012, at 2:43 PM, Eduardo Bellani wrote: >> >>> What holds me personally to emacs is paredit for now. DR is rocking these >>> days, >>> specially debugging wise. >> >> Really? We've got most of what paredit offers, including mapping raw >> left-paren to matched-pair (this option is currently called "automatic >> parentheses"). Glancing over the cheat-sheet, it looks like the only major >> change would be the fact that right-paren is not mapped to jump-outward; >> instead, I just use the right arrow for that (when there are intervening >> chars, I use opt-up opt-right). >> >> Are there other things that paredit gives you? > > My main gripe with DrRacket's automatic parentheses is the removal. > When, say, the left paren is removed, the right one remains. Paredit > handled such things automatically. Also Paredit is aware of the > context. If one insert a parenthesis inside a comment, it won't try to > balance it. It uses the `parser state' information from emacs > extensively to do its work, if I remember correct (I read the code > long ago to see if I can implement something similar in DrRacket, but > gave up). > > <http://www.gnu.org/software/emacs/manual/html_node/elisp/Parser-State.html>
Most of what you mention is, I agree, valid. One small point: in DrRacket, typing ( and then Cmd-Z (undo) does not remove the right paren. I regard this as a bug, and to be perfectly honest, I've been reluctant to report it because it's probably as easy as inserting a (begin-edit-sequence) (end-edit-sequence) pair somewhere. John
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