[PATCH 3/4] move dtas-graph into script/, support Perl for dtas.sh

[Eric Wong]

"script/" is the standard location for Perl ExtUtils::MakeMaker-based
installations, so and we'll probably overload "lib" to support Perl
scripts.  This is another step in expanding our use of Perl5 and
avoiding the slow startup and API instability of Ruby.
---
 dtas.sh                     | 7 ++++---
 {perl => script}/dtas-graph | 2 +-
 2 files changed, 5 insertions(+), 4 deletions(-)
 rename {perl => script}/dtas-graph (97%)

diff --git a/dtas.sh b/dtas.sh
index d3ea5e1..1ceca15 100755
--- a/dtas.sh
+++ b/dtas.sh
@@ -1,7 +1,8 @@
 #!/bin/sh -e
 # symlink this file to a directory in PATH to run dtas (or anything in bin/*)
 # without needing perms to install globally.  Used by "make symlink-install"
-p=$(realpath "$0" || readlink "$0") # neither is POSIX, but common
-p=$(dirname "$p") c=$(basename "$0") # both are POSIX
-exec ${RUBY-ruby} -I"$p"/lib "$p"/bin/"${c%.sh}" "$@"
+p=$(realpath "$0" || readlink "$0"); # neither is POSIX, but common
+p=$(dirname "$p") c=$(basename "$0"); c="${c%.sh}"
+if test -x "$p/bin/$c"; then exec ${RUBY-ruby} -I"$p"/lib "$p/bin/$c" "$@";
+else exec ${PERL-perl} -I"$p"/lib "$p/script/$c" "$@"; fi
 : this script is too short to copyright
diff --git a/perl/dtas-graph b/script/dtas-graph
similarity index 97%
rename from perl/dtas-graph
rename to script/dtas-graph
index 776485d..d918351 100755
--- a/perl/dtas-graph
+++ b/script/dtas-graph
@@ -1,5 +1,5 @@
 #!/usr/bin/perl -w
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 #
 # Process visualizer which shows pipe connections between processes with