mandoc: Implement the roff(7) .nop (no operation) request.

mandoc: Implement the roff(7) .nop (no operation) request.

[schwarze]

Log Message:
-----------
Implement the roff(7) .nop (no operation) request.  
Examples of manual pages (ab)using it 
include groff(7), chem(1), groff_mom(7), and groff_hdtbl(7).

Modified Files:
--------------
    mandoc:
        TODO
        roff.7
        roff.c

Revision Data
-------------
Index: roff.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/roff.c,v
retrieving revision 1.329
retrieving revision 1.330
diff -Lroff.c -Lroff.c -u -p -r1.329 -r1.330
--- roff.c
+++ roff.c
@@ -197,6 +197,7 @@ static	enum rofferr	 roff_line_ignore(RO
 static	void		 roff_man_alloc1(struct roff_man *);
 static	void		 roff_man_free1(struct roff_man *);
 static	enum rofferr	 roff_manyarg(ROFF_ARGS);
+static	enum rofferr	 roff_nop(ROFF_ARGS);
 static	enum rofferr	 roff_nr(ROFF_ARGS);
 static	enum rofferr	 roff_onearg(ROFF_ARGS);
 static	enum roff_tok	 roff_parse(struct roff *, char *, int *,
@@ -490,7 +491,7 @@ static	struct roffmac	 roffs[TOKEN_NONE]
 	{ roff_line_ignore, NULL, NULL, 0 },  /* nhychar */
 	{ roff_unsupp, NULL, NULL, 0 },  /* nm */
 	{ roff_unsupp, NULL, NULL, 0 },  /* nn */
-	{ roff_unsupp, NULL, NULL, 0 },  /* nop */
+	{ roff_nop, NULL, NULL, 0 },  /* nop */
 	{ roff_nr, NULL, NULL, 0 },  /* nr */
 	{ roff_unsupp, NULL, NULL, 0 },  /* nrf */
 	{ roff_line_ignore, NULL, NULL, 0 },  /* nroff */
@@ -3158,6 +3159,15 @@ roff_eo(ROFF_ARGS)
 		mandoc_vmsg(MANDOCERR_ARG_SKIP, r->parse,
 		    ln, pos, "eo %s", buf->buf + pos);
 	return ROFF_IGN;
+}
+
+static enum rofferr
+roff_nop(ROFF_ARGS)
+{
+	while (buf->buf[pos] == ' ')
+		pos++;
+	*offs = pos;
+	return ROFF_RERUN;
 }
 
 static enum rofferr
Index: TODO
===================================================================
RCS file: /home/cvs/mandoc/mandoc/TODO,v
retrieving revision 1.258
retrieving revision 1.259
diff -LTODO -LTODO -u -p -r1.258 -r1.259
--- TODO
+++ TODO
@@ -38,9 +38,6 @@ are mere guesses, and some may be wrong.
 
 --- missing roff features ----------------------------------------------
 
-- .nop prints its arguments as text,
-  see groff(7) for an example
-
 - .ft CB selects constant-width bold font
   see groff_out(7) for examples
 
Index: roff.7
===================================================================
RCS file: /home/cvs/mandoc/mandoc/roff.7,v
retrieving revision 1.96
retrieving revision 1.97
diff -Lroff.7 -Lroff.7 -u -p -r1.96 -r1.97
--- roff.7
+++ roff.7
@@ -206,7 +206,7 @@ Unescaped trailing spaces are stripped f
 literal context.
 In general, trailing whitespace on any input line is discouraged for
 reasons of portability.
-In the rare case that a blank character is needed at the end of an
+In the rare case that a space character is needed at the end of an
 input line, it may be forced by
 .Sq \e\ \e& .
 .Pp
@@ -665,7 +665,7 @@ produces
 .Pp
 in the input stream, and thus in the output: \fI\^XtFree\^\fP.
 Each occurrence of \e\e$* is replaced with all the arguments,
-joined together with single blank characters.
+joined together with single space characters.
 .Pp
 Since macros and user-defined strings share a common string table,
 defining a macro
@@ -1346,8 +1346,11 @@ Currently unsupported.
 Temporarily turn off line numbering.
 Currently unsupported.
 .It Ic \&nop Ar body
-Execute the rest of the input line as a request or macro line.
-Currently unsupported.
+Execute the rest of the input line as a request, macro, or text line,
+skipping the
+.Ic \&nop
+request and any space characters immediately following it.
+This is mostly used to indent text lines inside macro definitions.
 .It Ic \&nr Ar register Oo Cm + Ns | Ns Cm - Oc Ns Ar expression Op Ar stepsize
 Define or change a register.
 A register is an arbitrary string value that defines some sort of state,
--
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