On 14 March 2012 23:29, Glenn Fowler <[email protected]> wrote: > > On Wed, 14 Mar 2012 20:42:24 +0100 I. Szczesniak wrote: >> On Mon, Mar 5, 2012 at 11:42 PM, Wendy Lin <[email protected]> >> wrote: >> > I have a long standing feature request: Can the AST grep cmd be moved >> > into libcmd to make it a shell built in, please? Many platforms lack >> > suitable or standard (i.e. POSIX, like SunOS or AIX /bin/grep) >> > conforming grep implementations and a fast, conforming and >> > *accessible* grep implementation within ksh93 would be a *great* plus. >> > >> > Thanks for the consideration. > >> +1 > >> I agree that this would be very useful. The opensolaris illumos ksh93 >> already has AST grep as standard builtin, bound to /usr/xpg4/bin/grep, >> but to my surprise the standard ast-open distro does not. > >> Glenn, Roland, Olga, can you elaborate? > > writing a builtin requires more coding discipline than standalone commands > the upside for this is that ksh93 already uses most of the -last parts that > grep does > we just have to make sure that grep plays nice with > > * memory > * file descriptors > * checking ksh callback for interrupts > > the last one is important for possibly long running builtins > they must periodically call a ksh callback function to check for early > termination > a standalone implementation could just call exit(1) or let the signal default > terminate > a builtin inner loop is usually in the deepest part of the code > so early termination requires a meticulous unwind to the top > > the upside is we think we have all that taken care of > before we add it to -lcmd I think we could use some testing in the wild > I'll see about posting a small package that has the grep family as a ksh > plugin/builtin > that way we can beta test builtin grep without affecting the main distribution > I think there was also request for builtin xargs, that can go in there too
Can you give an estimation when the small package will become available? Are you going to distribute linux.amd64 binaries? Wendy _______________________________________________ ast-users mailing list [email protected] https://mailman.research.att.com/mailman/listinfo/ast-users
