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#!/usr/bin/env perl
# $Id$
# Public domain. Originally written by Karl Berry, 2022.
# 
# Top-level script to update from CTAN to TL.
# 
# First (unless placing was explicitly specified with [-]p),
# run a test import with c2l.
# Then, if no files were added or removed (and it was an existing
# package), or if placing was explicitly specified, automatically run
# c2l p to "place" the new package in svn with adds/removes.
# Do not run svn commit.
# 
# By the way, we accept "p" as well as "-p" because it's convenient for
# word deletion on the command line not to have a - lying around. For
# the same reason, the [-]p is given after the package, so we can
# add/remove it without having to edit the package name. Since we run
# this command multiple times a day, must optimize every keystroke.

use strict; use warnings;

(my $prg = $0) =~ s,.*/,,;

exit (&main ());

sub main {
  die "Usage: $0 PKGNAME [-][p]\n" if (@ARGV == 0 || @ARGV > 2); # USTL
  my $status = 1; # default to failure

  my $place = 0;
  if ($ARGV[$#ARGV] =~ /^-?p$/) {
    pop (@ARGV);
    $place = 1;
  }

  if ($place) {
    $status = &do_place ("$prg: p(lace) explicitly given");
    exit $status;
  }

  # no explicit place, run c2l to check if we can do it implicitly.
  printf "$prg: running c2l...";
  my @lines;
  ($status,@lines) = &run_c2l ("");
  if ($status) {
    print "first c2l failed, exiting.\n";
    print @lines;
    exit $status;
  }

  my $i;
  for ($i = 0; $i < @lines; $i++) {
    if ($lines[$i] =~ /^current vs.\ new/) {
      my $nextline = $lines[$i+1];
      if ($nextline =~ /^[0-9]+ common files, ([0-9]+) changed/) {
        if ($1 == 0) {
          print "seems nothing has changed, done.\n";
          print @lines;
	  $status = 0;
          last;
        } else {
          $status = &do_place ("no new or removed files");
          last;
        }

      } elsif ($place) {
        $status = &do_place ("new/removed files, but p(lace) given");
        last;
      
      } else {
        print "have new/removed files, exiting.\n";
        print @lines;
        last;
      }
    }
  }
  
  if ($i == @lines) {
    print "no current vs. new, exiting.\n";  # new package, presumably
    print @lines;
  }
  
  return $status;
}


# Run c2l to "place" (svn add/remove, but not commit) file.
# Return exit status.
# 
sub do_place {
  my ($desc) = @_;

  print "$desc, running for svn.\n";
  my ($status,@placelines) = &run_c2l ("p");
  print @placelines;
  if ($status) {
    print "$prg: *** do_place failed, exiting.\n";
  }
  
  return $status;
}


# Run c2l, specifying ARG. Return a list with the exit status
# and then all output lines.
# 
sub run_c2l {
  my ($arg) = @_;
  my $tmpfile = "/tmp/c2l$arg.out";
  
  # don't bother with svn update unless we are doing place.
  if ($arg eq "p") {
    delete $ENV{"TLPKGINFO_CATALOGUE_NO_UPDATE"};
  } else {
    $ENV{"TLPKGINFO_CATALOGUE_NO_UPDATE"} = 1;
  }
  
  my @ret = `set -o pipefail; c2l $arg @ARGV </dev/null 2>&1 | tee $tmpfile`;
  return ($?, @ret);
}