1 files changed, 84 insertions, 0 deletions
diff --git a/src/preproc/tbl/tests/save-and-restore-tab-stops.sh b/src/preproc/tbl/tests/save-and-restore-tab-stops.sh
new file mode 100755
index 0000000..b98922a
--- /dev/null
+++ b/src/preproc/tbl/tests/save-and-restore-tab-stops.sh
@@ -0,0 +1,84 @@
+#!/bin/sh
+#
+# Copyright (C) 2020 Free Software Foundation, Inc.
+#
+# This file is part of groff.
+#
+# groff is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# groff is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+# for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+groff="${abs_top_builddir:-.}/test-groff"
+
+# Regression-test Savannah #42978.
+#
+# When tbl changes the tab stops, it needs to restore them.
+#
+# Based on an example by Bjarni Igni Gislason.
+
+EXAMPLE='.TH tbl\-tabs\-test 1 2020-10-20 "groff test suite"
+.SH Name
+tbl\-tabs\-test \- see if tbl messes up the tab stops
+.SH Description
+Do not use tabs in man pages outside of
+.BR .TS / .TE
+regions.
+.PP
+But	if	you	do.\|.\|.
+.PP
+.TS
+l l l.
+table entries	long enough	to change the tab stops
+.TE
+.PP
+.EX
+#!/bin/sh
+case $#
+1)
+	if foo
+	then
+		bar
+	else
+		if baz
+		then
+			qux
+		fi
+	fi
+;;
+esac
+.EE'
+
+OUTPUT=$(printf "%s\n" "$EXAMPLE" | "$groff" -Tascii -P-cbou -t -man)
+FAIL=
+
+if ! echo "$OUTPUT" | grep -Eq '^ {12}if foo$'
+then
+    FAIL=yes
+    echo "first tab stop is wrong" >&2
+fi
+
+if ! echo "$OUTPUT" | grep -Eq '^ {17}bar$'
+then
+    FAIL=yes
+    echo "second tab stop is wrong" >&2
+fi
+
+if ! echo "$OUTPUT" | grep -Eq '^ {22}qux$'
+then
+    FAIL=yes
+    echo "third tab stop is wrong" >&2
+fi
+
+test -z "$FAIL"
+
+# vim:set ai noet sw=4 ts=4 tw=72: