eric%yamada-sun@CSE.OGI.EDU (08/01/90)
If I have a buffer that looks like this: (delete-matching-lines "fred") ellen fred mary rose and I put point after the right paren and do C-x C-e (eval-last-sexp), why doesn't the line with `fred' on it disappear?? (Try it). If I do `M-x delete-matching-lines fred', it does go away. I suspect there's something basic going on here that I don't understand. Apologies if I mailed this message to the wrong place, but I can't send or receive news. ------------------------------------------------------------------------ |Eric Hanchrow yamada-sun!eric@nosun.west.sun.com | |Phase III Logic, Inc. yamada-sun!eric@cse.ogi.edu | |1600 N.W. 167th Place Beaverton, OR 97006-4800 USA | |Voice: (503)-645-0313 Fax: (503)-645-0207 as of 13-Dec-89| --------------Crackling-noises-OK--do-not-correct!----------------------
sasdjb@unx.sas.com (David Biesack) (08/02/90)
In article <9007311707.AA08381@noname> eric%yamada-sun@CSE.OGI.EDU writes: > If I have a buffer that looks like this: > (delete-matching-lines "fred") > ellen > fred > mary > rose > and I put point after the right paren and do C-x C-e (eval-last-sexp), > why doesn't the line with `fred' on it disappear?? (Try it). If I do > `M-x delete-matching-lines fred', it does go away. I suspect there's > something basic going on here that I don't understand. When Emacs evaluates the expression, it first narrows the region to (point-min) up to (point). Try eval-last-sexp on the following: (sit-for 2) and notice how the buffer is narrowed (see the "Narrow" in the mode line) It appears that eval-region is doing this (eval-last-sexp calls eval-region). I don't know why eval-region does a narrow, though. probably to keep (read) from reading too far, since it is probably reading from the buffer instead of a buffer-substring since reading more than one expression from a string is pretty difficult. > ---------------------------------------------------------------------- > |Eric Hanchrow yamada-sun!eric@nosun.west.sun.com | > |Phase III Logic, Inc. yamada-sun!eric@cse.ogi.edu | > |1600 N.W. 167th Place Beaverton, OR 97006-4800 USA | > |Voice: (503)-645-0313 Fax: (503)-645-0207 as of 13-Dec-89| > --------------Crackling-noises-OK--do-not-correct!-------------------- djb -- David J. Biesack SAS Institute, Inc. Object Programming Technology SAS Campus Drive sasdjb@dev.sas.com Cary, NC 27513-2414 rti!sas!sasdjb (919) 677-8000 ext. 7771