tests: New helper function feed_input, for comment support

feed_input drops lines starting with a bar character '|', so they can
serve as comments.  Syntax chosen because such lines shouldn't be
needed in tests.  In particular, the server already ignores such lines
when it reads commands, because they get parsed as empty command with
a pipeline, and empty commands get ignored, regardless of
redirections.

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>

tests/actofgod-test

@@ -31,9 +31,8 @@ EOF
 
 begin_test "$srcdir"/tests/actofgod/init_script
 
-perl "$srcdir"/tests/actofgod/geninput.pl | src/client/empire POGO peter >/dev/null
+perl "$srcdir"/tests/actofgod/geninput.pl | feed_input POGO peter
 
 end_test
 
-# Test completed; compare results
 cmp_out var/empire/server.log var/empire/journal.log actofgod.xdump

tests/smoke-test

@@ -27,7 +27,7 @@ create_sandbox
 
 begin_test "$srcdir"/tests/smoke/fairland.xdump
 
-src/client/empire POGO peter <"$srcdir"/tests/smoke/newcap_script >/dev/null
+feed_input POGO peter "$srcdir"/tests/smoke/newcap_script
 
 t=
 for i in `git ls-files "$srcdir"/tests/smoke | grep 'tests/smoke/../..$'`
@@ -36,7 +36,7 @@ do
     t="${i%/??}"
     if [ "$p" != "$t" ] && [ "$p" ]
     then
-	src/client/empire POGO peter <<EOF >/dev/null
+	feed_input POGO peter <<EOF
 power new
 report *
 cen * ?own#0
@@ -50,7 +50,7 @@ EOF
     then c=POGO r=peter
     else c="${b#0}"; r="$c"
     fi
-    src/client/empire "$c" "$r" <"$i" >/dev/null
+    feed_input "$c" "$r" "$i"
 done
 
 end_test

tests/test-common.sh

@@ -70,6 +70,14 @@ stop_server()
     done
 }
 
+feed_input()
+{
+    c=$1
+    r=$2
+    shift 2
+    sed '/^|/d' "$@" | src/client/empire "$c" "$r" >/dev/null
+}
+
 begin_test()
 {
     src/util/files -e sandbox/etc/empire/econfig -f >/dev/null