Basic implementation of the roff(7) .ta (define tab stops) request.

This is the first feature made possible by the parser reorganization.
Improves the formatting of the SYNOPSIS in many Xenocara GL manuals.
Also important for ports, as reported by many, including naddy@.

6 files changed, 106 insertions, 1 deletions

diff --git a/regress/roff/Makefile b/regress/roff/Makefile
index 96474204..c97b99b1 100644
--- a/regress/roff/Makefile
+++ b/regress/roff/Makefile
@@ -1,7 +1,7 @@
 # $OpenBSD: Makefile,v 1.20 2015/02/06 16:05:51 schwarze Exp $
 
 SUBDIR  = args cond esc scale string
-SUBDIR += br cc de ds ft ig it ll na nr ps rm sp tr
+SUBDIR += br cc de ds ft ig it ll na nr ps rm sp ta tr
 
 .include "../Makefile.sub"
 .include <bsd.subdir.mk>
diff --git a/regress/roff/ta/Makefile b/regress/roff/ta/Makefile
new file mode 100644
index 00000000..656c5174
--- /dev/null
+++ b/regress/roff/ta/Makefile
@@ -0,0 +1,5 @@
+# $OpenBSD$
+
+REGRESS_TARGETS	= basic-mdoc basic-man
+
+.include <bsd.regress.mk>
diff --git a/regress/roff/ta/basic-man.in b/regress/roff/ta/basic-man.in
new file mode 100644
index 00000000..f2f4641d
--- /dev/null
+++ b/regress/roff/ta/basic-man.in
@@ -0,0 +1,19 @@
+.TH TA-BASIC-MAN 1 "May 7, 2014" OpenBSD
+.SH NAME
+ta-basic-man \- setting tabstop positions in man(7)
+.SH DESCRIPTION
+.nf
+default:
+1	2	3
+10n:
+.ta 10n
+1	2	3
+none:
+.ta
+1	2	3
+3n +6n T 4n +2n:
+.ta 3n +6n T 4n +2n
+1	2	3	4	5	6	7	8	9
+default unit:
+.ta 3 +4 12
+1	2	3	4
diff --git a/regress/roff/ta/basic-man.out_ascii b/regress/roff/ta/basic-man.out_ascii
new file mode 100644
index 00000000..37062245
--- /dev/null
+++ b/regress/roff/ta/basic-man.out_ascii
@@ -0,0 +1,22 @@
+TA-BASIC-MAN(1)             General Commands Manual            TA-BASIC-MAN(1)
+
+
+
+NNAAMMEE
+       ta-basic-man - setting tabstop positions in man(7)
+
+DDEESSCCRRIIPPTTIIOONN
+       default:
+       1    2    3
+       10n:
+       1         23
+       none:
+       123
+       3n +6n T 4n +2n:
+       1  2     3   4 5   6 7   8 9
+       default unit:
+       1  2   3    4
+
+
+
+OpenBSD                           May 7, 2014                  TA-BASIC-MAN(1)
diff --git a/regress/roff/ta/basic-mdoc.in b/regress/roff/ta/basic-mdoc.in
new file mode 100644
index 00000000..24c83bd4
--- /dev/null
+++ b/regress/roff/ta/basic-mdoc.in
@@ -0,0 +1,34 @@
+.Dd May 7, 2017
+.Dt TA-BASIC-MDOC 1
+.Os OpenBSD
+.Sh NAME
+.Nm ta-basic-mdoc
+.Nd setting tabstop positions in mdoc(7)
+.Sh DESCRIPTION
+.Bd -unfilled
+default:
+1	2	3
+10n:
+.ta 10n
+1	2	3
+none:
+.ta
+1	2	3
+3n +6n T 4n +2n:
+.ta 3n +6n T 4n +2n
+1	2	3	4	5	6	7	8	9
+.Ed
+.Pp
+literal:
+.Bd -literal -compact
+1	2	3
+.Ed
+.Pp
+after literal:
+.br
+1	2	3
+.Pp
+default unit:
+.br
+.ta 3 +4 12
+1	2	3	4
diff --git a/regress/roff/ta/basic-mdoc.out_ascii b/regress/roff/ta/basic-mdoc.out_ascii
new file mode 100644
index 00000000..83feb627
--- /dev/null
+++ b/regress/roff/ta/basic-mdoc.out_ascii
@@ -0,0 +1,25 @@
+TA-BASIC-MDOC(1)            General Commands Manual           TA-BASIC-MDOC(1)
+
+NNAAMMEE
+     ttaa--bbaassiicc--mmddoocc - setting tabstop positions in mdoc(7)
+
+DDEESSCCRRIIPPTTIIOONN
+     default:
+     1    2    3
+     10n:
+     1         23
+     none:
+     123
+     3n +6n T 4n +2n:
+     1  2     3   4 5   6 7   8 9
+
+     literal:
+     1       2       3
+
+     after literal:
+     1       2       3
+
+     default unit:
+     1  2   3    4
+
+OpenBSD                           May 7, 2017                          OpenBSD