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Re: [Nmh-workers] [PATCH] scan message numbers from stdin

From: Paul Fox
Subject: Re: [Nmh-workers] [PATCH] scan message numbers from stdin
Date: Mon, 18 Aug 2008 15:11:29 -0400

eric wrote:
 > If `-' is specified for
 > .RI msgs
 > .B scan
 > will read message numbers from the standard input and scan those.  Each line
 > must have exactly one message number.  Lines beginning with `+' are ignored.
 > So, you want
 >   printf '%s\n' 1 2 3 4 5 | scan -

any particular reason for this restriction?  i can't think of a
use case for 'echo 1 2 3 | scan', but when i do, i'll be surprised
that it doesn't work.

 > > >but that isn't what the implementation does.
 > > 
 > > ...I do think that this isn't a good idea.
 > > 
 > > I think that it would be nice if 'scan 4 1 2' actually output the messages
 > > in the order stated on the command line. I also think that it would be
 > I, too, would rather 'scan 3 4' print the lines in that order
 > (first 3, then 4).  In any case, having scan - sort the messages
 > entirely defeats its purpose (scan as you go).

i don't think default scan behavior should change w.r.t. 
sorting/uniq'ing its arguments.  an option that explicitly
suppressed the sorting wouldn't be a bad thing, though -- i've
sometimes wanted the messages in as-specified order.

however, since as you say, the message numbers shouldn't be
sorted in the stdin case, perhaps this would obviate the need for
explicit support for unsorted messages elsewhere.  (i.e., if you
want the messages in as-specified order, then use "echo 1 2 3 |

 paul fox, address@hidden (arlington, ma, where it's 79.3 degrees)

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