Allow for precisely one instance of RunCommand plugin

Dependencies

• [2] 6ZXL5UOP Add a plugin to execute arbitrary commands when a build finishes
• [3] GD2WBYPT RunCommand: Return metrics as a float

Change contents

• replacement in src/lib/Hydra/Plugin/RunCommand.pm at line 28
  [2.601]→[2.601:694](∅→∅)
  − my ($cfg, $event) = @_;

  − for my $x (split " ", ($cfg->{events} // "buildFinished")) {
  [2.601]

  [2.694]
  + my ($conf, $event) = @_;

  + for my $x (split " ", ($conf->{events} // "buildFinished")) {
• replacement in src/lib/Hydra/Plugin/RunCommand.pm at line 39
  [2.847]→[2.847:901](∅→∅)
  − my $config = $self->{config}->{runcommand} // [];
  [2.847]

  [2.901]
  + my $cfg = $self->{config}->{runcommand};

  + my @config = defined $cfg ? ref $cfg eq "ARRAY" ? @$cfg : ($cfg) : ();
• replacement in src/lib/Hydra/Plugin/RunCommand.pm at line 44
  [2.916]→[2.916:997](∅→∅)
  − foreach my $cfg (@$config) {

  − next unless eventMatches($cfg, $event);
  [2.916]

  [2.997]
  + foreach my $conf (@config) {

  + next unless eventMatches($conf, $event);
• replacement in src/lib/Hydra/Plugin/RunCommand.pm at line 47
  [2.1039]→[2.1039:1075](∅→∅)
  − $cfg->{job} // "*:*:*",
  [2.1039]

  [2.1075]
  + $conf->{job} // "*:*:*",
• replacement in src/lib/Hydra/Plugin/RunCommand.pm at line 52
  [2.1201]→[2.1201:1295](∅→∅)
  − my $command = $cfg->{command} // die "<runcommand> section lacks a 'command' option";
  [2.1201]

  [2.1295]
  + my $command = $conf->{command} // die "<runcommand> section lacks a 'command' option";