Allow unprefixed \U primitive with luatex >= 0.75.0 and update the comments

git-svn-id: svn://tug.org/texlive/trunk@28991 c570f23f-e606-0410-a88d-b1316a301751

1 files changed, 13 insertions, 10 deletions

diff --git a/Master/texmf-dist/tex/latex/latexconfig/lualatexiniconfig.tex b/Master/texmf-dist/tex/latex/latexconfig/lualatexiniconfig.tex
index 8d1ae191552..f61ca7f485f 100644
--- a/Master/texmf-dist/tex/latex/latexconfig/lualatexiniconfig.tex
+++ b/Master/texmf-dist/tex/latex/latexconfig/lualatexiniconfig.tex
@@ -7,8 +7,9 @@
 \catcode`\}=2
 \directlua{
   % etex and pdftex primitives are enabled without prefixing
+  % as well as extented Unicode math primitives (see below)
   tex.enableprimitives('', 
-    tex.extraprimitives('etex', 'pdftex'))
+    tex.extraprimitives('etex', 'pdftex', 'umath'))
   % other primitives are prefixed with luatex (see below)
   tex.enableprimitives('luatex', 
     tex.extraprimitives('core', 'omega', 'aleph', 'luatex'))
@@ -44,25 +45,27 @@
 %   (allowing easy detection of LuaTeX-besed formats) and a prefixed
 %    version \luatexdirectlua (for consistency with \luatexlatelua).
 %   
-% 6 Various remarks:
+% 6 All primitives dealing with Unicode math already begin with \U,
+%   and maybe will match the names of XeTeX primitives some day, so
+%   LuaTeX (starting from 0.75.0) allows listing them separately (the
+%   special 'umath' keyword above), and they are now provided unprefixed.
+%   But because they are also listed with the 'luatex' keyword, they are
+%   duplicated with \luatex prefix, which allows for backword
+%   compatability with previous version of the format.
+%     
+% 7 Various remarks:
 % (a) The obvious drawback of such a prefixing policy is that the names
 %     used by LaTeX or generic macro writer won't match the names used
 %     in the manual.  We hope this is compensated by the gain in
 %     backwards compatibility.
 %     
-% (b) All primitives dealing with Unicode math already begin with \U,
-%     and maybe will match the names of XeTeX primitives some day, so
-%     maybe prefixing was not necessary/desirable for them. However, we
-%     tried to make the prefixing rule as simple as possible, so that
-%     point (a) doesn't get even worse.
-%     
-% (c) The final name of some primitive may sound strange, namely those
+% (b) The final name of some primitive may sound strange, namely those
 %     already containing the name of an engine, such as
 %     \luatexOmegaVersion.  However, since LuaTeX is not a drop-in
 %     replacement for Omega/Aleph, we felt it wrong to provide
 %     \OmegaVersion.
 %     
-% (d) Maybe some day we'll feel it's better to provide all
+% (c) Maybe some day we'll feel it's better to provide all
 %     primitives without prefixing. If this happens, it
 %     will be easy to add the unprefixed primitives in the format while
 %     keeping the prefixed names for compatibility. It wouldn't work the