[PATCH] script/*: shorten and point to docs

[Eric Wong <e@80x24.org>]

Try to keep these scripts as short as possible so it's easier to
find the manpage.  For -rproxy, I guess a small note at the top
will have to do...
---
 script/mwrap-decode-csv |  1 -
 script/mwrap-perl       | 23 ++++++++---------------
 script/mwrap-rproxy     |  2 +-
 3 files changed, 9 insertions(+), 17 deletions(-)

diff --git a/script/mwrap-decode-csv b/script/mwrap-decode-csv
index 5bbc171..ad73b8c 100644
--- a/script/mwrap-decode-csv
+++ b/script/mwrap-decode-csv
@@ -1,7 +1,6 @@
 #!perl -w
 # Copyright (C) mwrap hackers <mwrap-perl@80x24.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
-# addr2line decoder for the output of MWRAP=dump_csv:$FILENAME
 use v5.12;
 use Devel::Mwrap::Rproxy;
 use IO::Handle;
diff --git a/script/mwrap-perl b/script/mwrap-perl
index c9a5666..632deaf 100644
--- a/script/mwrap-perl
+++ b/script/mwrap-perl
@@ -1,24 +1,17 @@
-#!/usr/bin/perl -w
+#!perl -w
 # Copyright (C) mwrap hackers <mwrap-perl@80x24.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 use v5.12;
 use Devel::Mwrap;
-my ($so) = grep(m!/Mwrap\.so\z!, @DynaLoader::dl_shared_objects);
-defined($so) or die 'Mwrap.so not loaded';
-my $cur = $ENV{LD_PRELOAD};
+my ($so) = grep(m!/Mwrap\.so\z!, @DynaLoader::dl_shared_objects)
+	or die 'Mwrap.so not loaded';
 if (!@ARGV || ($ARGV[0] // '') =~ /\A(?:-h|--help)\z/) {
-	require Pod::Usage;
-	Pod::Usage::pod2usage(@ARGV ? 0 : 1);
+	require Pod::Usage; Pod::Usage::pod2usage(@ARGV ? 0 : 1);
 }
-if (defined $cur) {
-	my @cur = split(/[: \t]+/, $cur);
-	if (!grep(/\A\Q$so\E\z/, @cur)) {
-		# drop old redundant versions
-		my @keep = grep(!m!/Mwrap\.so$!, @cur);
-		$ENV{LD_PRELOAD} = join(':', $so, @keep);
-	}
-} else {
-	$ENV{LD_PRELOAD} = $so;
+my @cur = split(/[: \t]+/, $ENV{LD_PRELOAD} // '');
+if (!grep(/\A\Q$so\E\z/, @cur)) { # drop old redundant versions
+	my @keep = grep(!m!/Mwrap\.so$!, @cur);
+	$ENV{LD_PRELOAD} = join(':', $so, @keep);
 }
 exec @ARGV;
 __END__
diff --git a/script/mwrap-rproxy b/script/mwrap-rproxy
index 056e80a..57fdde7 100644
--- a/script/mwrap-rproxy
+++ b/script/mwrap-rproxy
@@ -1,7 +1,7 @@
 #!perl -w
 # Copyright (C) mwrap hackers <mwrap-perl@80x24.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
-# thin wrapper for Devel::Mwrap::Rproxy
+# thin wrapper for Devel::Mwrap::Rproxy (see __END__ below for manpage)
 use v5.12; # strict
 eval { require Plack::Runner } or die "Plack not installed: $@\n";
 use Getopt::Long qw(:config no_ignore_case no_auto_abbrev pass_through);