perf-test: add ruby test

Simply list the message-id of all the messages in a loop 100 times.

Suggested-by: David Bremner <david@tethera.net>
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

performance-test/T05-ruby.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+test_description='ruby bindings'
+
+. $(dirname "$0")/perf-test-lib.sh || exit 1
+
+if [ "${NOTMUCH_HAVE_RUBY_DEV}" = "0" ]; then
+    echo "missing prerequisites: ruby development files"
+    exit 0
+fi
+
+time_start
+
+time_run 'print all messages' "$NOTMUCH_RUBY -I '$NOTMUCH_BUILDDIR/bindings/ruby' <<'EOF'
+require 'notmuch'
+db = Notmuch::Database.new('$MAIL_DIR')
+100.times.each do
+    db.query('').search_messages.each do |msg|
+	puts msg.message_id
+    end
+end
+EOF"
+
+time_done