Bugzilla Bug 139226

This patch adds a new switch, '--last', which sorts the package order just
before printing to STDOUT.  The packages are ordered by Build/Install time,
newest first.

From the rpm-4.2.1 man page:

   PACKAGE QUERY OPTIONS:
       --last Orders  the  package listing by install time such that the
              latest packages are at the top.

Created an attachment (id=90890) [edit]
patch to add '--last' option

Please consider inclusion.  This is very useful.

Thanks, I added this functionality in version 1.31.  My implementation is a
little different from yours, but should work nearly the same way.  It uses
integer comparison for the mtimes instead of string comparison to avoid
magnitude bugs.

+    # Sort package order, by reverse mtime
+    if ($opt{'last'}) {
+       my %mtimes;
+       @pkgs = sort {
+           # When was this last built/installed?
+           unless (exists $mtimes{$a}) {
+               $mtimes{$a} = (stat "$dbpath/$a")[9];
+               vverb "$a = $mtimes{$a}";
+           }
+           unless (exists $mtimes{$b}) {
+               $mtimes{$b} = (stat "$dbpath/$b")[9];
+               vverb "$b = $mtimes{$b}";
+           }
+           $mtimes{$b} <=> $mtimes{$a} or $a cmp $b;
+       } @pkgs;
+    }
+

Sounds good, and thanks!  I use this feature in conjunction with 'sed' when
determining what packages to rebuild for a new toolchain / library, since
revdep-rebuild is often insufficient.  Example: list all packages emerged prior
to gcc 4.1.1 .

I should mention that I discovered a bug in my '--last' implementation some
time ago, and I do not know if the integer comparison will solve it.  If the
file whose datestamp is tested (environment.bz2 ?) does not exist, then that
package is not listed after sorting with 'epm -qa --last', whereas an 'epm -qa'
would still list that package.