Update in anticipation of a new version of Getopt::Complete.

The new version implements a function that uses a different environment
variable as part of avoiding evaluating output redirection in completion.

For now, encountering the old Getopt::Complete setup will quietly return
no completions.

bin/ur

@@ -3,10 +3,15 @@ use strict;
 use warnings;
 
 BEGIN {
-    if ($ENV{COMP_LINE}) {
+    if ($ENV{COMP_CWORD}) {
         eval "use Getopt::Complete::Cache class => 'UR::Namespace::Command', above => 1;";
         exit if ($@);
     }
+    if ($ENV{COMP_LINE}) {
+        #for transitioning from older version of completion
+        #just return no result
+        exit;
+    }
 };
 
 use above "UR";

lib/Command/Dispatch/Shell.pm

@@ -14,7 +14,7 @@ sub execute_with_shell_params_and_exit {
     $Command::entry_point_class ||= $class;
     $Command::entry_point_bin ||= File::Basename::basename($0);
 
-    if ($ENV{COMP_LINE}) {
+    if ($ENV{COMP_CWORD}) {
         require Getopt::Complete;
         my @spec = $class->resolve_option_completion_spec();
         my $options = Getopt::Complete::Options->new(@spec);

lib/Command/V1.pm

@@ -141,7 +141,7 @@ My::Command->execute_with_shell_params_and_exit;
     $Command::entry_point_class ||= $class;
     $Command::entry_point_bin ||= File::Basename::basename($0);
 
-    if ($ENV{COMP_LINE}) {
+    if ($ENV{COMP_CWORD}) {
         require Getopt::Complete;
         my @spec = $class->resolve_option_completion_spec();
         my $options = Getopt::Complete::Options->new(@spec);