send-email: drop FakeTerm hack

Back in 280242d (send-email: do not barf when Term::ReadLine does not
like your terminal, 2006-07-02), we added a fallback for when
Term::ReadLine's constructor failed: we'd have a FakeTerm object
instead, which would then die if anybody actually tried to call
readline() on it. Since we instantiated the $term variable at program
startup, we needed this workaround to let the program run in modes when
we did not prompt the user.

But later, in f4dc943 (send-email: lazily load modules for a big
speedup, 2021-05-28), we started loading Term::ReadLine lazily only when
ask() is called. So at that point we know we're trying to prompt the
user, and we can just die if ReadLine instantiation fails, rather than
making this fake object to lazily delay showing the error.

This should be OK even if there is no tty (e.g., we're in a cron job),
because Term::ReadLine will return a stub object in that case whose "IN"
and "OUT" functions return undef. And since 5906f54 (send-email:
don't attempt to prompt if tty is closed, 2009-03-31), we check for that
case and skip prompting.

And we can be sure that FakeTerm was not kicking in for such a
situation, because it has actually been broken since that commit! It
does not define "IN" or "OUT" methods, so perl would barf with an error.
If FakeTerm was in use, we were neither honoring what 5906f54 tried
to do, nor producing the readable message that 280242d intended.

So we're better off just dropping FakeTerm entirely, and letting the
error reported by constructing Term::ReadLine through.

Backported from dfd46ba (send-email: drop FakeTerm hack,
2023-08-08).

Signed-off-by: Jeff King <peff@peff.net>
Acked-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>

Author: peff

git-send-email.perl

@@ -26,18 +26,6 @@
 
 Getopt::Long::Configure qw/ pass_through /;
 
-package FakeTerm;
-sub new {
-	my ($class, $reason) = @_;
-	return bless \$reason, shift;
-}
-sub readline {
-	my $self = shift;
-	die "Cannot use readline on FakeTerm: $$self";
-}
-package main;
-
-
 sub usage {
 	print <<EOT;
 git send-email' [<options>] <file|directory>
@@ -930,16 +918,10 @@ sub get_patch_subject {
 }
 
 sub term {
-	my $term = eval {
-		require Term::ReadLine;
-		$ENV{"GIT_SEND_EMAIL_NOTTY"}
+	require Term::ReadLine;
+	return $ENV{"GIT_SEND_EMAIL_NOTTY"}
 			? Term::ReadLine->new('git-send-email', \*STDIN, \*STDOUT)
 			: Term::ReadLine->new('git-send-email');
-	};
-	if ($@) {
-		$term = FakeTerm->new("$@: going non-interactive");
-	}
-	return $term;
 }
 
 sub ask {