Implementing a .nop request which does nothing.

* src/roff/troff/input.cc (nop_request): New function.
(init_input_requests): Use it.
* src/roff/troff/troff.man, NEWS, man/groff.man: Updated.


* doc/groff.texinfo: Added some comments.

1 files changed, 16 insertions, 1 deletions

diff --git a/doc/groff.texinfo b/doc/groff.texinfo
index ea209bde..9a2333d8 100644
--- a/doc/groff.texinfo
+++ b/doc/groff.texinfo
@@ -2888,6 +2888,8 @@ silently ignored or expanded to nothing.
 
 @c XXX add info about -ww command line option.
 
+@c XXX info about common identifier pool for strings and macros.
+
 @xref{Interpolating Registers}, and @ref{Strings}.
 
 
@@ -6081,6 +6083,8 @@ Here are some examples:
 .if 0 .ab how'd this happen?
 @end example
 
+@c XXX .nop request
+
 @findex ie
 @findex el
 An if-then-else is written using two requests @code{ie} and @code{el}.
@@ -6184,6 +6188,17 @@ paragraphs.
 ..
 @end example
 
+@c XXX add info about indirect macro calls:
+@c
+@c .de xxx
+@c from xxx\c
+@c ..
+@c
+@c test \*[xxx] test
+@c   => test from xxx test
+
+@c XXX info about common identifier pool for strings and macros.
+
 @findex am
 @cindex appending, to a macro
 The @code{am} request works similarly to @code{de} except it appends
@@ -6303,7 +6318,7 @@ name.
 This would be called as
 
 @example
-.vl $Id: groff.texinfo,v 1.42 2000/08/26 13:50:23 wlemb Exp $
+.vl $Id: groff.texinfo,v 1.43 2000/09/02 12:33:19 wlemb Exp $
 @end example
 
 @xref{Request Arguments}.