texinfo ChangeLog doc/texinfo.tex

[Karl Berry]

CVSROOT:        /sources/texinfo
Module name:    texinfo
Changes by:     Karl Berry <karl>       12/07/06 23:10:30

Modified files:
        .              : ChangeLog 
        doc            : texinfo.tex 

Log message:
        @ifcommanddefined, @ifcommandnotdefined, txicommandconditionals: 
prospective new conditionals and @set

CVSWeb URLs:
http://cvs.savannah.gnu.org/viewcvs/texinfo/ChangeLog?cvsroot=texinfo&r1=1.1383&r2=1.1384
http://cvs.savannah.gnu.org/viewcvs/texinfo/doc/texinfo.tex?cvsroot=texinfo&r1=1.368&r2=1.369

Patches:
Index: ChangeLog
===================================================================
RCS file: /sources/texinfo/texinfo/ChangeLog,v
retrieving revision 1.1383
retrieving revision 1.1384
diff -u -b -r1.1383 -r1.1384
--- ChangeLog   6 Jul 2012 18:34:56 -0000       1.1383
+++ ChangeLog   6 Jul 2012 23:10:27 -0000       1.1384
@@ -1,5 +1,9 @@
 2012-07-06  Karl Berry  <address@hidden>
 
+       * doc/texinfo.tex (@ifcommanddefined, @ifcommandnotdefined): new
+       prospective conditionals, not confirmed
+       (txicommandconditionals): implicitly @set this variable.
+
        * doc/texinfo.txi (Node Line Requirements): discuss commands in
        node names.
        (Two Paths): merge into Texinfo Document Structure, with @anchor.

Index: doc/texinfo.tex
===================================================================
RCS file: /sources/texinfo/texinfo/doc/texinfo.tex,v
retrieving revision 1.368
retrieving revision 1.369
diff -u -b -r1.368 -r1.369
--- doc/texinfo.tex     5 Jun 2012 21:44:33 -0000       1.368
+++ doc/texinfo.tex     6 Jul 2012 23:10:29 -0000       1.369
@@ -3,7 +3,7 @@
 % Load plain if necessary, i.e., if running under initex.
 \expandafter\ifx\csname fmtname\endcsname\relax\input plain\fi
 %
-\def\texinfoversion{2012-06-05.14}
+\def\texinfoversion{2012-07-03.16}
 %
 % Copyright 1985, 1986, 1988, 1990, 1991, 1992, 1993, 1994, 1995,
 % 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
@@ -4206,7 +4206,7 @@
 }
 \def\ifsetfail{\doignore{ifset}}
 
-% @ifclear VAR ... @end ifclear reads the `...' iff VAR has never been
+% @ifclear VAR ... @end executes the `...' iff VAR has never been
 % defined with @set, or has been undefined with @clear.
 %
 % The `\else' inside the `\doifset' parameter is a trick to reuse the
@@ -4217,6 +4217,35 @@
 \def\ifclear{\parsearg{\doifset{\else \let\next=\ifclearfail}}}
 \def\ifclearfail{\doignore{ifclear}}
 
+% @ifcommandisdefined CMD ... @end executes the `...' if CMD (written
+% without the @) is in fact defined.  We can only feasibly check at the
+% TeX level, so something like `mathcode' is going to considered
+% defined even though it is not a Texinfo command.
+% 
+\makecond{ifcommanddefined}
+\def\ifcommanddefined{\parsearg{\doifcmddefined{\let\next=\ifcmddefinedfail}}}
+%
+\def\doifcmddefined#1#2{{%
+    \makevalueexpandable
+    \let\next=\empty
+    \expandafter\ifx\csname #2\endcsname\relax
+      #1% If not defined, \let\next as above.
+    \fi
+    \expandafter
+  }\next
+}
+\def\ifcmddefinedfail{\doignore{ifcommanddefined}}
+
+% @ifcommandnotdefined CMD ... handlded similar to @ifclear above.
+\makecond{ifcommandnotdefined}
+\def\ifcommandnotdefined{%
+  \parsearg{\doifcmddefined{\else \let\next=\ifcmdnotdefinedfail}}}
+\def\ifcmdnotdefinedfail{\doignore{ifcommandnotdefined}}
+
+% Set the `txicommandconditionals' variable, so documents have a way to
+% test if the @ifcommand...defined conditionals are available.
+\set txicommandconditionals
+
 % @dircategory CATEGORY  -- specify a category of the dir file
 % which this file should belong to.  Ignore this in TeX.
 \let\dircategory=\comment