Added full `HP' libman macro support.

2 files changed, 56 insertions, 7 deletions

diff --git a/man.7 b/man.7
index c66ee98e..b5be3aa2 100644
--- a/man.7
+++ b/man.7
@@ -262,7 +262,7 @@ and
 This section is a canonical reference to all macros, arranged
 alphabetically.  For the scoping of individual macros, see
 .Sx MACRO SYNTAX .
-.Bl -tag -width Ds -offset indent
+.Bl -tag -width Ds
 .It \&B
 Text is rendered in bold face.
 .It \&BI
@@ -281,6 +281,8 @@ render in italics.  Whitespace between arguments is omitted in output.
 Text is rendered alternately in bold face and roman (the default font).
 Whitespace between arguments is omitted in output.
 .It \&HP
+Begin a paragraph whose initial output line is left-justified, but
+subsequent output lines are indented.
 .\" TODO.
 .It \&I
 Text is rendered in italics.
@@ -363,9 +365,23 @@ macro.
 .El
 .\" SECTION
 .Sh COMPATIBILITY
-See
-.Xr mdoc 7
-for groff compatibility notes.
+This section documents compatibility with other roff implementations, at
+this time limited to
+.Xr groff 1 .
+.Bl -hyphen
+.It
+In quoted literals, groff allowed pair-wise double-quotes to produce a
+standalone double-quote in formatted output.  This idiosyncratic
+behaviour is no longer applicable.
+.It
+The
+.Sq \&sp
+macro does not accept negative numbers.
+.It
+Blocks of whitespace are stripped from both macro and free-form text
+lines (except when in literal mode), while groff would retain whitespace
+in free-form text lines.
+.El
 .\" SECTION
 .Sh SEE ALSO
 .Xr mandoc 1 ,
@@ -374,7 +390,7 @@ for groff compatibility notes.
 .Sh AUTHORS
 The
 .Nm
-utility was written by
+reference was written by
 .An Kristaps Dzonsons Aq kristaps@kth.se .
 .\" SECTION
 .Sh CAVEATS
diff --git a/man_term.c b/man_term.c
index b9660797..504f8a7c 100644
--- a/man_term.c
+++ b/man_term.c
@@ -66,6 +66,7 @@ static	int		  pre_sp(DECL_ARGS);
 
 static	void		  post_B(DECL_ARGS);
 static	void		  post_I(DECL_ARGS);
+static	void		  post_HP(DECL_ARGS);
 static	void		  post_SH(DECL_ARGS);
 static	void		  post_SS(DECL_ARGS);
 static	void		  post_i(DECL_ARGS);
@@ -80,7 +81,7 @@ static const struct termact termacts[MAN_MAX] = {
 	{ pre_PP, NULL }, /* PP */
 	{ pre_PP, NULL }, /* P */
 	{ pre_IP, NULL }, /* IP */
-	{ pre_HP, NULL }, /* HP */ 
+	{ pre_HP, post_HP }, /* HP */ 
 	{ NULL, NULL }, /* SM */
 	{ pre_B, post_B }, /* SB */
 	{ pre_BI, NULL }, /* BI */
@@ -407,12 +408,44 @@ static int
 pre_HP(DECL_ARGS)
 {
 
-	/* TODO */
+	switch (n->type) {
+	case (MAN_BLOCK):
+		fmt_block_vspace(p, n);
+		break;
+	case (MAN_BODY):
+		p->flags |= TERMP_NOBREAK;
+		p->flags |= TERMP_TWOSPACE;
+		p->offset = INDENT;
+		p->rmargin = INDENT * 2;
+		break;
+	default:
+		return(0);
+	}
+
 	return(1);
 }
 
 
 /* ARGSUSED */
+static void
+post_HP(DECL_ARGS)
+{
+
+	switch (n->type) {
+	case (MAN_BODY):
+		term_flushln(p);
+		p->flags &= ~TERMP_NOBREAK;
+		p->flags &= ~TERMP_TWOSPACE;
+		p->offset = INDENT;
+		p->rmargin = p->maxrmargin;
+		break;
+	default:
+		break;
+	}
+}
+
+
+/* ARGSUSED */
 static int
 pre_PP(DECL_ARGS)
 {