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+#!/bin/sh
+#
+# Copyright (C) 2021 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="${abs_top_builddir:-.}/test-groff"
+
+# Test the line numbering feature.
+
+input='.nr pp 18 \\" to make troff output consistent with nroff
+.if r mypo .po \\n[mypo]u
+.if !d C .ds C\\" empty
+.pp
+Feck, vex loping bad jazz: quench my thirst.
+Feck, vex loping bad jazz: quench my thirst.
+.pp
+.n1 \\*C
+Jackdaws love my big sphinx of quartz.
+Jackdaws love my big sphinx of quartz.
+Jackdaws love my big sphinx of quartz.
+.pp
+How vexingly quick daft zebras jump!
+.pp
+.n2 +6
+Waltz, bad nymph, for quick jigs vex.
+Waltz, bad nymph, for quick jigs vex.
+.pp
+.n2 99
+Pack my box with five dozen liquor jugs.
+Pack my box with five dozen liquor jugs.
+Pack my box with five dozen liquor jugs.
+.pp
+.n2
+The five boxing wizards jump quickly.
+The five boxing wizards jump quickly.'
+
+fail=
+
+wail () {
+ echo "...FAILED" >&2
+ fail=YES
+}
+
+echo '*** basic output (line number field prepended)' >&2
+output=$(echo "$input" | "$groff" -Tascii -P-cbou -me)
+
+echo "$output"
+
+# We expect the foregoing to produce a me(7) diagnostic complaining of a
+# negative page offset but we're not testing for that.
+
+echo 'checking for 0 page offset and 5n paragraph indentation (1)' >&2
+echo "$output" | grep -q '^ Feck.*vex$' || wail # 5 spaces
+
+# troff uses backspaces to emit the line number, so we can't anchor the
+# matches to the beginning of the line with '^'.
+
+# These patterns have 6 embedded spaces until further notice.
+echo 'checking for line number field plus 60n line length' >&2
+echo "$output" | grep -q '1 Jackdaws.*love$' || wail
+
+echo 'checking for non-numbering of blank lines' >&2
+echo "$output" | grep -q '4 How.*jump!$' || wail
+
+echo 'checking offset-advanced two-digit line number' >&2
+echo "$output" | grep -q '^10 Waltz,.*bad nymph$'
+
+echo 'checking three-digit line number' >&2
+echo "$output" | grep -q '^100 with.*dozen$'
+
+echo 'checking for 0 page offset and 5n paragraph indentation (2)' >&2
+echo "$output" | grep -q '^ The.*boxing$' || wail # 5 spaces
+
+echo '*** roff(1)-compatible output (shorter line length)' >&2
+output=$(echo "$input" | "$groff" -dCC -Tascii -P-cbou -me)
+
+echo "$output"
+
+echo 'checking for 0 page offset and 5n paragraph indentation (1)' >&2
+echo "$output" | grep -q '^ Feck.*vex' || wail # 5 spaces
+
+echo 'checking for line number field plus 56n line length' >&2
+echo "$output" \
+ | grep -q ' 1 Jackdaws.*Jackdaws$' || wail # 2, then 6 spaces
+
+# These patterns have 6 embedded spaces until further notice.
+echo 'checking for non-numbering of blank lines' >&2
+echo "$output" | grep -q '4 How.*jump!$' || wail
+
+echo 'checking offset-advanced two-digit line number' >&2
+echo "$output" | grep -q ' 10 Waltz,.*bad$' || wail
+
+echo 'checking three-digit line number' >&2
+echo "$output" | grep -q '^100 box.*dozen$'
+
+echo 'checking for 0 page offset and 5n paragraph indentation (2)' >&2
+echo "$output" | grep -q '^ The.*boxing$' || wail # 5 spaces
+
+echo '*** output with 4n page offset' >&2
+output=$(echo "$input" | "$groff" -rmypo=4n -Tascii -P-cbou -me)
+
+echo "$output"
+
+echo 'checking for 4n page offset and 5n paragraph indentation (1)' >&2
+echo "$output" | grep -q '^ Feck.*vex' || wail # 9 spaces
+
+echo 'checking for line number field plus 60n line length' >&2
+echo "$output" \
+ | grep -q ' 1 Jackdaws.*love$' || wail # 2, then 6 spaces
+
+# These patterns have 6 embedded spaces until further notice.
+echo 'checking for non-numbering of blank lines' >&2
+echo "$output" | grep -q '4 How.*jump!$' || wail
+
+echo 'checking offset-advanced two-digit line number' >&2
+echo "$output" | grep -q ' 10 Waltz,.*bad$' || wail
+
+echo 'checking three-digit line number' >&2
+echo "$output" | grep -q '^100 box.*dozen$'
+
+echo 'checking for 4n page offset and 5n paragraph indentation (2)' >&2
+echo "$output" | grep -q '^ The.*boxing$' || wail # 9 spaces
+
+test -z "$fail"
+
+# vim:set ai et sw=4 ts=4 tw=72: