path: root/Build/source/texk/web2c/luatexdir/NEWS

==============================================================
Luatex beta-0.40.0 was released 20090422
==============================================================

* The embedded MPlib is updated to version 1.200.

* Texlua would crash if run font.read_tfm() was used.

* Luatex would crash on empty \patterns.

* Lots of small C code cleanups.

* \textdir inside a \hbox dir *** was wrong earlier.

* 0.39.0 introduced a bug that would make luatex crash whenever
  font expansion was used.

* Font tables returned by define_font can now have a key named
  'cache' that controls the internal lua font table caching.

* There is no longer a need for an explicit --progname if there
  is no input file given.

==============================================================
Luatex beta-0.39.0 was released 20090415
==============================================================

* iniluatex will from now on start up with only the TeX82 primitives
  and \directlua, everything else has to be bootstrapped via 
  tex.enableprimitives(). This change was planned for 0.40.0,
  but *now* is the time to test it.
  
* A bugfix for \primitive in various expandable contexts,
  and \primitive now generates an error message when the 
  argument is not actually a primitive's name.

* There was a bug found in the math accent handling.

* Large math operators are now treated like extensible characters
  in the sense that they can be composed of segments.

* The extra assign- and restore tracing information from eTeX
  had a massive bug because of a dangling else in the pascal web.
  As a side-effect of fixing this bugs, all such potential errors
  in the pascal web have been fixed (for now).

* The math parameters can now be set and queried from lua code
  via the new tex.setmath() and tex.getmath() functions.

* Reflection in a \hbox was broken.

* There was a leak of direction nodes in the paragraph builder.

* The font backend now does a small peek to differentiate 
  truetype and postscript style opentype fonts. This fixes
  the "Can't find CFF table" bug for otf's with truetype outlines.

* Parameters and registers can now also be assinged to globally
  from lua (see the manual for details).

* It is now possible to query the current math style while a 
  formula is still being constructed by using the new read-only
  value \mathstyle. Associated is the new command \Ustack that
  is to be used as a prefix for {.. \over ..} and friends. 
  See the manual for more information.

* The embedded MPLib is brought up to date with the current
  metapost repository (version 1.110 and a few small patches).
  
* Luatex can now handle two breakpoints inside a single ligature
  (like for the functional word of-f-ice). The solution is not
  perfect yet, but the chance of missed hyphenation points in 
  actual documents should now be negligible.

* Some speedups in the font loading code, and in the handling of 
  pdf_literal nodes that are set from within Lua code.

* Some source code and manual cleanup, as usual.

==============================================================
Luatex beta-0.38.0 was released 20090410
==============================================================

* tex.enableprimitives() had a bug were previously defined (but
  currently undefined) control sequences prevented the creation 
  of the new csname.

* The special calling format callback.register('name', false)
  not only disables the callback, but also the builtin code it 
  is supposed to replace. 

* Empty \localleftbox and \localrightbox -es are now suppressed.

* Support for <f>.MathConstants.SubscriptShiftDownWithSuperscript
  was added, to solve the lack of "sub2" in OpenType math.

* Luatex now supports horizontal super- and subscript placement
  corrections via the OpenType MATH mathkern table. See the
  manual for details.

* node.write() no longer copies its argument node list before 
  appending it.

* There are six new primitives that are verbose forms 
  of one and two byte special tokens:
  \Usuperscript \Usubscript 
  \Ustartmath \Ustopmath 
  \Ustartdisplaymath \Ustopdisplaymath

* The attribute node leaks in math mode and alignmetns have been 
  fixed.

* The 11 simple math noads are now combined into a single "noad"
  node type.

* Static linking against libstdc++ is working once again.

* There is a small fix in the keyword scanner to solve the
  problem of 'Runaway ... while scanning ???' that could happen
  for some primitives.

* Lua now also has the "architecture independent bytecode"
  patch applied.

* Lua is updated to version 5.1.4 with coco patches 1.1.5, and 
  lpeg is now 0.9. 

* Some TRT/TLT backend bugs are fixed.

* Various manual updates.

==============================================================
Luatex beta-0.37.0 was released 20090331
==============================================================

* Luatex now implements shell_escape = 'p', a new feature
  in web2c that intends to make \write18 more secure. As 
  a side-effect, if luatex is used for typesetting, it will 
  now also apply shell_escape = 'p' and shell_escape = 'f'
  to the lua functions io.popen(), os.execute(), os.exec(), 
  and os.spawn().
  Nothing has changed for the case where luatex is used as 
  a script interpreter.

* Attributes can now have negative values. The special value
  for 'unset' is lowered to -0x7FFFFFFF (it used to be -1).

* The lua 'kpse' library now has an object-oriented interface 
  as companion to the procedural interface. This is useful for
  e.g. controlling the discovery of mplib files.

* The new internal integer parameter \outputbox allows setting
  of the output box number (default: 255, max: 65535)

* The new primitives \Udelimiterunder and \Udelimiterover 
  complete the set of 'StretchStacks' for OpenType Math.

* Fixed a bug in font string conversions on the Macintosh that 
  resulted in warnings about 'unaligned pointers being freed'.

* Khaled Hosny spotted a bunch of manual errors.

* There was bug in the width of math_accent objects when 
  there were super- or subscripts attached to the accentee.

* In PDF mode, TRT \leaders were bugged.

* The source tree now uses the new texlive build system that 
  Peter Breitenlohner created. 

* There is now a single build.sh instead of four separate
  ones. It has a few options:
      --make      : only make, no make distclean; configure
      --parallel  : make -j 2 -l 3.0
      --nostrip   : do not strip binary
      --mingw     : crosscompile for mingw32 from i386-linux
      --ppc       : crosscompile for ppc osx on intel osx

  Note: --parallel still sometimes causes crashes due to
  timing errors, so use that option with care.

* Many compiler warnings have been removed (but not all yet).

==============================================================
Luatex beta-0.36.0 was released 20090323
==============================================================

* The included fontforge code is stripped considerably, and
  the lua table to access the code is renamed to 'fontloader'.
  The old name ('fontforge') will remain present for a while,
  but will eventually go away.

* New lua functions: tex.primitives(), tex.extraprimitives, 
  tex.enableprimitives().  This is a prelude to a big change
  in the next beta: iniluatex will from now on start up with
  only the TeX82 primitives and \directlua, everything else
  has to be bootstrapped via tex.enableprimitives().
  See the manual for more details.

* Support for multiple lua states has been removed, and at the
  same time support for adding name ids to lua chunks has been
  added.  See the manual for more details.

* More changes to the PDF backend to make it support non-latin
  directions (form and image placement, vertical typesetting,
  synctex).

* The kpathsea library is updated. Highlights: cleaner build 
  process (thanks to Peter Breitenlohner), cleaner mingw32 
  (cross)compilation support, and a new reentrant API.

* Some possible endless loops within extended delimiters in
  math mode are now trapped.

* Movements inside VF font characters were considerably off 
  due to a wrong conversion routine.

* Error handling for \outer has been reinstated, but can be
  suppressed via the new primitive \suppressoutererror.

* The new primitives: \suppresslongerror and \suppressifcsnameerror
  that can be used to suppress errors for \par in non-long macros 
  and for non-expandable objects inside \ifcsname ... \endcsname, 
  respectively.

* New lua function: node.vpack() via a patch from Khaled Hosny
  that also improves error handling in node.hpack().

* Fix the typo that caused \charic (instead of \charit)
  to be defined as a primitive.

* Suppression of hyphenation via \hyphenchar\font=-1 now works
  again.

* The lua functions tex.print(), tex.sprint(), tex.write() now
  accept an array of strings as well as vararg list of strings
  to print.

* A change to be build process: luatex.p is no longer split 
  int smaller pieces before running the C compiler.

* Melissa O'Neill contributed a bugfix to the Type1 font 
  subsetting code.

* A bunch of smaller bugfixes and cleanups (as usual).

==============================================================
Luatex beta-0.35.0 was released 20090224
==============================================================

* The math handling portions of LuaTeX are converted to C code,
  and extended to support Unicode math. There are a great many
  related changes, see the new Math chapter in the manual for 
  details.

* A nasty bug in the paragraph breaking routine was fixed.
  (All lines except the first one were believed to be wider then
  they really were. This affected which nodes were considered 
  as active breakpoints) 

* Various changes to the PDF backend to make it support non-latin
  directions.

* Fixed the behaviour of the page offsets. Placement of the output 
  on the physical page should now work correctly in all directions, 
  both in DVI and PDF.
  There now are \pageleftoffset and \pagetopoffset primitives,
  as well as 

* fontforge.apply_featurefile() was broken since 0.31.0

* The lua profiler library is added.

* The included lua filesystem library is now 1.4.1.

* Reading of pk files fixed.

* An optional space afer a <direction specifier> for \textdir c.s.
  is ignored from  now on.

* \bodydir and \pagedir can now be (re)set even after the first 
  page has been output.

* The new callback mlist_to_hlist can be used to intercept the 
  normal conversion of math lists to horizontal lists.

* The programs ttf2afm and pdftosrc are removed from the luatex
  distribution (these belong to pdftex).

* fontforge.open() now uses much less memory when opening large
  (CJK) fonts.

* The included libpng is now 1.2.35.

* Quite a lot of smaller bugfixes and cleanups (as usual).


==============================================================
Luatex beta-0.31.3 was released 20081229
==============================================================

This release has a bunch of updates from the development trunk
(#1657-1670,1677,1678,1680,1685,1687).

  * Closing of files opened by \externalocp.

  * Fix for a locale-related bug that make PDF generation fail
    with a "Parsing CFF Dict failed" message when including 
    opentype fonts.
 
  * The included metapost is now version 1.102.

  * PDF rules in vertical modes in RL direction where output
    in the wrong direction

  * Fix for a crash on Apple fonts that contain a 'bsln' table.

  * The handling of the second argument to fontforge.open() was
    broken

  * The included libpng is now 1.2.34

  * Handling of ttc files on Windows was broken


==============================================================
Luatex beta-0.31.2 was released 20081209
==============================================================

Besides fixing building issues, this release has

  * A small fix for a crash that could happen when using
    external OCPs.

  * A fix in the format of fontforge.to_table output.
    (In 0.31.1 <font>.lookups was near-empty; the lookups
    were accidentally output as part of the gpos table).

==============================================================
Luatex beta-0.31.1 was released 20081209
==============================================================

fixed a bunch of compilation errors on various platforms, but 
with no other visible changes.


==============================================================
Luatex beta-0.31.0 was released 20081205
==============================================================

This is just an intermediate release so that some testing can be
done on the updated fontforge embedding.

* There are new fields being generated by fontforge.to_table(),
  and one or two old ones have been removed. These fields are /
  will be documented in the manual, but very briefly:

  - MATH table and associated information are now exported
    (the main reason for the new fontforge code)
  - Baseline data is now exported
    (perhaps usable in lua code)
  - Multiple Master / Glyph variation data is now exported
    (but useless, for now)
  - Mac Feature (AAT) information is now exported
    (perhaps usable in lua code)
  - If (lookup) names were saved via the PfED table, these
    will the exported instead of the default, generated names.
    (as requested by Yannis)

* dfont is now treated as an archive format just like ttc
  when it comes to fontforge.info(). NOTE: that does not mean you
  can actually use them, because the  backend doesn't know
  yet how to embed dfont fonts in the PDF, that is on the
  TODO list for the next big beta (0.40.0).

* The executables are a lot larger than before. That is because
  much more of fontforge is included than before. Likely this
  will stay this way, because this makes upgrading the ff code
  much easier, and it means that luatex/FF potentially
  understands more font formats (after upgrading the backend,
  of course)


==============================================================
Luatex beta-0.30.3 was released 20081128
==============================================================

This release fixes a really big bug, a few smaller ones,
and has updates of png and mplib:

* All hyphenation patterns that were anchored at the start or
  end of a word were ignored in luatex versions 0.25.X and 0.30.X
  (and possibly even earlier).

* Repeated use of \language=-1 could result in "There is not room
  for another language".

* The lua true coroutines patch (Coco) is now disabled on OpenBSD
  running on non-intel platforms.

* The lua socket library is patched so that it will now compile on
  OpenSolaris.

* Luatex now has libpng 1.2.33 and mplib 1.100

==============================================================
Luatex beta-0.30.2 was released 20081020
==============================================================

* The Lua coco change from 0.30.1 is reverted as it gave
  trouble on MacOSX. Lua coco on non-intel OpenBSD platforms
  is now explicitly turned off.

* The lua file reading speedup in 0.30.1 broke reading of
  files larger than 100MB.

* Reading of font-related files was broken when there was a find
  callback, but no read callback.

* The texmf.cnf array size setup values were ignored whenever
  --lua was given on the commandline (instead of only when
  texconfig.kpse_init is set to false).

* glyphs with negative widths resulted in incorrect horizontal
  placement (overlapping) of the string in the output PDF.

* Using \latelua could sometimes result in an invalid output PDF,
  and the argument token list was expanded too early

* There was a read buffer overrun in the mapfile parser

* There are two new variables in the status table:
  status.callbacks and status.indirect_callbacks (execution counts).

==============================================================
Luatex beta-0.30.1 was released 20081009
==============================================================

* Invalid return values from the linebreak_filter callback
  are now handled gracefully (was crashing)
* a preinstalled ctangle is no longer needed except when
  cross-compiling
* In 0.30.0, the .notdef fix was incorrectly applied to
  truetype / opentype fonts.
* A bunch of all memory leaks is fixed
* In lua, f:read('*a') now uses signicantly less memory
* The number of \catcodetables is now limited to 64KB
  (for speed reasons)
* Luatex could crash if there were PDF images with and
  without page /Group included on the same page
* Lua coco now always uses setjmp (for OpenBSD compatibility)
* The embedded mplib is updated to the latest svn version
* # marks (characters with catcode 6) are no longer doubled
  inside \directlua
* Handling the nul character (U+0000) with catcode 13
  (active) was broken
* Luatex could crash on win32 with an access violation
  because there was one predefined language too few
  (the one matching \language=-1) 

==============================================================
Luatex beta-0.30.0 was released 20080930
==============================================================

New features:

* Readable \tex internal params that are counts, attrs, or dimens are
  now returned as numbers instead of strings, and skips as node objects.
  Read-write access to tex's skip registers added: tex.skip[0] etc.
* new callback: 'linebreak_callback' to replace the internal paragraph
  breaking code
* the tex table now supports more readable 'convert' values:
  tex.fontname, tex.pdffontname, tex.pdffontobjnum, tex.pdffontsize,
  tex.uniformdeviate, tex.number, tex.romannumeral, tex.pdfpageref,
  tex.pdfxformname  (each takes a number as argument)
* new readable parameter: tex.fontidentifier(number) returns the
  \csname associated with that font id
* luatex now outputs \FONT<nr> instead of \^^@ in Overfull/Underfull
  messages if the font's id text is zero (like for expanded fonts) (#77)
 * luatex --version is split into --version and --credits
* There is now (again) an svn revision number in luatex --version (#91)
* Add support for more read-only internal access from lua:
  tex.lastpenalty, tex.lastkern, tex.lastskip, tex.lastnodetype,
  tex.inputlineno, tex.badness, tex.pdftexversion, tex.pdflastobj,
  tex.pdflastxform, tex.pdflastximage, tex.pdflastximagepages,
  tex.pdflastannot, tex.pdflastxpos, tex.pdflastypos, tex.pdfrandomseed,
  tex.pdflastlink, tex.luatexversion, tex.Alephversion,
  tex.Omegaversion, tex.Alephminorversion, tex.Omegaminorversion,
  tex.eTeXminorversion, tex.eTeXversion, tex.currentgrouplevel,
  tex.currentgrouptype, tex.currentiflevel, tex.currentiftype,
  tex.currentifbranch, tex.pdflastximagecolordepth (#81)
* the old --src-specials are replaced by --synctex (#63)
* the \expanded primitive is backported from pdftex 1.50 (#43)
* luatex now comes with libpng 1.2.32
* experimental: tex.definefont(string, number) associates a
  csname string with a font id number

Bugs fixed compared to 0.29.0:

* dashes were exported wrongly by MPlib
* multi-item \discretionaries were broken in various ways (#78, mailinglist)
* read_font_info was sometimes called recursively from lua-loaded
  virtual fonts
* do_vf was sometimes called on lua-loaded fonts that where
  already known to be virtual
* trailing junk in tfm files is now ignored (needed for ecrm fonts)
* pdf_ignored_dimen was initialized too late, breaking \prevdepth
  handling and causing output lines to overlap eachother (#72)
* pdf.immediateobj() had a printf-related bug
* the fontname terminal logging is fixed for strange font file names
* lua tex array assignments now listen to the globaldefs setting
  (tex.count[0] etc) (#92,partial)
* \parshape was broken (#70)
* there is no longer a ".tex" extension forced on very input file (#74)
* eof() for mapfiles was true one byte too soon (#76)
* out of range \lefthyphenmin and \righthyphenmin settings now actually
  disable hyphenation (#90)
* tex.unset_attribute() looked too far ahead when a to-be-unset
  attribute id not only did not exist in the node, but was also
  higher than the highest set attribute on the node. (#65)
* the parameters attr and page_name of read_image() were swapped
  (this broke \pdfimage with attributes)
* tex filenames with spaces in them on the command line are now
  allowed again (#30)
* sometimes pfb fonts were included multiple times without valid
  reason (#29)
* some parts of the pdftex 1.40.9 PNG transparancy hack were still
  present and caused transparant png handling to fail
* \localinterlinepenalty and \localbrokenpenalty were broken
* special case catcode tables are now handled better (#23)
* the handling of missing .notdef charstrings in old pfb fonts
  is fixed (#27)

==============================================================
Luatex beta-0.29.0 was released 20080718
==============================================================


New features:

* The embedded pdftex is now 1.40.9 (forthcoming) except for the
   following:
   - the png transparancy fix is skipped because it is in conflict
     with a macro-based solution offered by context mkiv.
   - LFS (PDF files > 2GiB) is not working yet.
   - Synctex is still missing

* libpng, xpdf, and zlib are updated to their pdftex 1.0.9 levels

* MPlib is updated to 1.090

* The syntax of buildpage_filter is changed to avoid confusion
   (and crashes). See the manual for the new calling convention.

Bugs fixed compared to 0.28.0:

* The previous bugfix for \languages skipping numbers was wrong.

* Various compile-time warnings are suppressed

* \pdfsetmatrix was broken

* \pdfsave and \pdfrestore were broken

* Valid user_defined whatsits nevertheless were generating errors.


==============================================================
Luatex beta-0.28.0 was released 20080630
==============================================================

There is one new feature:

There is now experimental support for non-trivial discretionaries
following explicit hyphens. In analogy to \prehyphenchar and
\posthyphenchar, there are two new parameters \preexhyphenchar en
\postexhyphenchar. Both new parameters default to zero (nothing).
When set to a nonzero value, the parameter is added to either the
pre- or post- break text. Note that this is *in addition to* the
hyphen already in the input. Testing and comments are very welcome.

Here is a short example (no idea what is says):

   \pdfoutput=1
   \hsize=2in
   \postexhyphenchar=`-
   Seria bom se eu
   pudesse t\^e-lo mantido como amigo, mas por
   mais bem-intencionado que eu fosse, n\~ao
   foi possivel
   \bye



Bugs fixed compared to 0.27.0:

* Words that started off with a character with a zero \lccode
   were never hyphenated at all.

* There was a bug in the new active characters code that prevented
   the latex format from being built (with Invalid character error).

* There is a temporary fix for the sometimes appearing "Font has a
   bad FontBB" message from Acrobat.

* \leaders did not actually stretch enough (the last bit of glue
   that has to line up the line endings was never output to the PDF).

* Bad paragraph-related callbacks could result in luatex crashing.

* The pre_linebreak and post_linebreak filters were never called
   when \output was active (this was a leftover of a superceded
   optimization).

* 'skipping' language codes when setting up \patterns c.s. did not
   work (it used the next empty slot instead of the actual value of
   \language).

* Using multiple 'attr' keywords on box items could cause random
   crashes.

* Calling lang.hyphenate() with one argument (without specifying a
    tail node) could crash.

* The luatex pdf banner and version reporting is cleaned up a bit.

* Conflicting patterns inside \patterns now give an error:
     ! Conflicting pattern ignored.
   (duplicate identical patterns are ignored without error).

==============================================================
Luatex beta-0.27.0 was released 20080624
==============================================================

Bugs fixed compared to 0.25.3:

* Unicode reencoding support for non-standard (i.e. older)
   Type1 fonts is now somewhat less broken than it was (#25)

* .vf fonts using specials crashed luatex

* luatex would crash on --\par (#33)

* An attempt is made to get a sane default value for StemV in
   the created pdf (#32)

* We can now guarantee that %PDF-1.* header is printed before
   the first pdf.print() output

* lang.hyphenate() was broken

* insert_before(a,a,b) was broken (#37)

* argv[0] is now cleaned up before being used as a default for
   mem_name and prog_name (#28).

* luatex would crash on loading extended fonts (fonts loaded
   via lua callbacks) from a format file.

* The fix for pdftex bug #799 is backported from pdftex 1.40.4.

* slnunicode had a bug in the unicode.utf8.gmatch iterator.

* Queries of nonexisting fontdimens could cause a crash.

* luatex would crash on {\textdir TLT\pardir TLT x\break\par }

* Fixed wrong placement of lines in mixed-direction paragraphs
   that could happen in some situations.

Other news:
* Luatex now includes luasocket (#35)
   See http://www.tecgraf.puc-rio.br/~diego/professional/luasocket/
   for usage.
   There is a new commandline option: --nosocket to disable this,
   and that is also implied by --safer.

   NOTE to the binary builders: there are some unfixed configure
   problems when you need to add a specific library to get socket
   support on your platform. You probably will have to edit the
   generated Makefile by hand (search for 'socketlib').

* There is ongoing development to the 'img' and 'mplib' libraries.
   See the reference manual for details.

* The 'character commands' in virtual fonts now support image
   inclusion. See the reference manual for details.

* Lua error messages now include the call stack.

* \directlua and \latelua have been extended to accept a 'name'
   keyword. The argument is a token list that is used as the lua
   name of this chunk in lua error messages and call stack prints.
   (#42)

* The lua chunk names can be interfaced via a new virtual
   table called lua.instancename, the values in that function as
   defaults in the absence of 'name' keywords.

* The 2-plane limit on active character range is removed (#12).

* Subsetted TTF fonts in the PDF now retain the cmap table.

* There is a new Lua variable os.selfdir. This contains the
   full absolute pathname of the directory that the executable
   resides in (with symlinks resolved)

* There is a new function os.uname() this returns a lua
   table containing various platform information items.

* The node library now uses text strings for direction specifiers
   instead of numbers. See the reference manual for details.

* The 'E' (edit) as error response functionality is now a noop.

* Adding luatex 0.25.3 to texlive resulted in a few minor backports,
   in particular: Support for mktexfmt is added, and luatangle now
   identifies itself as such (instead of calling itself otangle).

* We fixed a whole series of portability problems (but
   we probably introduced new problems as well).

* Most (all?) files now have a corrected Copyright header,
   and link in $Id$ and  $URL: http://scm.foundry.supelec.fr/svn/luatex/trunk/source/texk/web2c/luatexdir/NEWS $ into the object file.

* Some unnecessary files were removed from the distribution.

==============================================================
Luatex beta-0.25.3 was released 20080418
==============================================================

Bugs fixed:
* Pdftex bug no. 936 (sarovar) regarding vertical
  positioning of embedded PDF files if depth parameter is given.
* Luatex gave bogus lua return values for the tex.wd/hd/dp
  values of void boxes
* A few bugfixes in mplib (square pens caused hangs, elliptical
  pens caused confused output)
* Hyphenation of uppercase words (\uchyph) was broken
* Output image placements corrected for all 8 transform cases
  also when artbox etc. is used
* There were missing maketexstring() calls in error messages
* Math display contents were sometimes prematurely freed during
  the placement of the equation number
* Setting \language=-1 could cause crashes due to an array
  index going out-of-bounds

Other news:
* build.sh.ppc is added to the source distribution. This is a
  script that crosscompiles osx ppc binaries from osx intel
* tex.box[<chardef name>] is now supported (but still experimental)
* a bunch of compiler warnings are removed
* The fontforge library now dump AAT feature tags as and
  "<id,flags>" string
* The new function font.nextid() predicts the next assigned font id
* Some source code changes are backported from texlive 

==============================================================
Luatex beta-0.25.2 was released 20080410
==============================================================

* Updated to MPlib 0.40
* Bugfixes and cleanup in the lua img table code
* Fix \pdflastximagepages bug from pdftex
* Fix for very large tex.print strings
* Update to Lpeg 0.8.1
* &D Bugfix for Type1 fonts when out-of-range characters
  are marked as 'used'

==============================================================
Luatex beta-0.25.1 was released 20080321
==============================================================

* Updated to MPlib 0.30 (that is now becoming usable)
* The build requirement for a pre-installed ctangle is gone
  (thanks to Martin)

==============================================================
Luatex beta-0.25.0 was released 20080311
==============================================================

New:

* mplib library:
   This version features an embedded MP interpreter whose output
   can be directly accessed from lua code (mplib), without calls
   to an external "mpost" command. Of course it has bugs and
   limitations (makempx does not work, for example) but keep in
   mind that it is only an initial attempt.
   See the manual for more details.
* img library:
   ** img.immediatewrite() is added
   ** images now accept a 'transform' key
   ** widths etc. can now be given as width="100mm"

Fixed:

* \parshape handling was completely broken since 0.20.0+
* when \pdfprotrudechars was in effect, an assertion failure
   could happen when embedded \hboxes in the paragraph appeared
   at the end of a line.
* import of otf fonts with contextual lookups has been debugged,
   thanks to a patch by GW himself.
* compiling with gcc 4.2.3 is now supported
* if you want to build from source, you need a pre-installed ctangle.


==============================================================
Luatex beta-0.22.1 was released 20080227
==============================================================

* The macnames.c source file for building ttf2afm is restored.
* "make depend" in luatexdir now works again
* luatex sometimes crashed because it attempted to expand an
  already expanded font
* luatex aborted when --progname was given but no format name.
  It now sets the format name to the given progname in that case
* sometimes paragraphs with near-empty lines could cause a crash
* img.supportedtypes() had a bug causing it to crash
* img.supportedtypes() has been renamed to img.types for consistency
* img.boxes() added, returns strings representing bounding boxes
* img.node() added, returns a whatsit node cf. \pdfrefximage
* node.write() now accepts multiple arguments
* the program_name_set switch was not set automatically from C,
  causing errors unless lua code called kpse.set_program_name()
  explicitly
* kpse.set_program_name() can now be called more than once
  in a single run.
* os.spawn{...} and os.exec{...} could cause crashes because of
  a memory allocation error

==============================================================
Luatex beta-0.22.0 was released 20080215
==============================================================

* We now have an official bug tracker: http://tracker.luatex.org
* A new lua library (img) is added that allows a direct
   interface to the image handling of luatex. You can use this
   to include images from lua code instead of via the more
   traditional \pdfximage cs. See the manual.
* An optional equal sign after \{pre,post}hyphenchar is now
   allowed.
* os.exec() has been extended, and os.spawn() added. These
   functions have support for quoted strings, and they
   also accept a table with preseparated command arguments.
* New string constants os.type and os.name are provided.
* node.last_node() is added. This pops and returns the last
   node from luatex's 'current list'
* node.write() is added. This appends a node to the end of
   luatex's 'current list' (experimental).
* The strict check on unicode compliance in pattern files
   is dropped. Patterns files still have to be in proper UTF-8
   encoding, but the error for non-Unicode character values
   (like 0 - 31 and 127 - 159) is dropped.
* \pdfadjustinterwordglue, \prependkern, \appendkern
   and associated \XXXXcode arrays are gone.
* The rest of the pdftex font arrays are now merged into
   the new luatex font data structure. This means that you
   can now set up font expansion from lua code, and that a few
   font-related limits are gone.
* The 'top_skip' field in 'insert' nodes is renamed to 'spec',
   for improved consistency.
* kpse.show_path() added. This behaves just like
   $ kpsewhich --show-path
* The unicode.utf8 functions now also accept values in the range
   1.114.112 - 1.114.367 that is used by LUATEX for raw byte output.

What's been fixed:

* Better node memory (de)allocation error tracking and messages
* Compilation on MacOSX 10.5 was broken
* There was a bug in node.insert_after
* Use of \{pre,post}hyphenchar was broken
* lfs.permissions was leaking memory
* Some warning and error messages are improved a bit
* A set of bugs in character protrusion, this seems to be working
   ok now.
* Also, a set of bugs in font expansion. This now works in most
   cases but is not quite bugfree yet (problematic files for testing
   are welcomed).
* The functions in the kpse library would crash luatex if
   kpse.set_program_name() was not yet called. gives an error now.
* Alignments with spanned columns could cause crashes
* A patch is added for problems with filename parsing on the
   "first input line" (by Jonathan Kew)
* The hpack_filter and vpack_filter were only called for lists longer
   than one node.
* Luatex is now more forgiving about font subsets being smaller
   than their expected size (issues a warning instead of aborts now)
* A "double-free ignored" error for paragraphs with lines starting
   with discarded items was fixed.

==============================================================
Luatex beta-0.20.2 was released 20071217
==============================================================

* some portability fixes to the build scripts
* a fix for multi-\span in alignments causing unbreakable
   loops
* manual improvements from Jonathan Sauer
* fix for undefined csnames in \directlua if
   web2c's hash_extra is nonzero
* fix for LR text inside of a RL document
* fix for open_read_file callback not being called
   unless find_read_file was also registered
* removed the ocp status message when \ocps are not
   actually used
* "unicodeenc" in the fontforge to_table renamed to
   "unicode" for improved consistency

==============================================================
Luatex beta-0.20.1 was released 20071207
==============================================================

* texlua was broken on Solaris because the some C header
   files were loaded in the wrong order.
* os.tmpdir() now accepts an argument, making it easier
   to use. It now generates more unique filenames when
   it is called repeatedly in one run.
* The --luaconly commandline switch is now documented
   in the --help text.
* The new extended hyphenation exceptions were severely
   broken.
* \pdfprotrudechars could cause luatex to abort with an
   assertion failure.
* There was a bug in the  \span code that could cause endless
   loops.
* The simple forms of \leaders were messed up on windows
   because a variable was not properly initialized.
* Non-grouped \textdir commands created invalid output.
* e-TeX's pseudo files were not closed properly in ini mode.
* The luatex.web now weaves properly again.
* I made some small improvements to the manual.

==============================================================
Luatex beta-0.20.0 was released 20071205
==============================================================

News compared to the last beta (0.11.2) is as follows:

* Completely overhauled hyphenation and ligkern application,
  including the addition of a new "lang" table in lua to
  interface to the language parameters, some extra functions
  in the "node" table, and a few extra callbacks ("hyphenate",
  "ligaturing", "kerning", "post_linebreak_filter").

  There is a new chapter in the manual to document all the
  changes to the hyphenation and line breaking algorithms,
  it is simply too much to list here.

* the interface of the pre_linebreak_filter,hpack_filter,
  vpack_filter, and pre_output_filter has changed slightly.

* boxes can now get explicit attributes different from the
  currently active set, using a syntax like

  \hbox attr2=12 attr3=-1 to 12pt {Hi!}

* lpeg is now at version 0.7

* a whole series of exotic bugs and compiler warnings are
  fixed, mostly thanks to the watchful eye of Fabrice.

* texio.print now accepts multiple strings as arguments.

* the lua functions os.sleep(), os.times(), os.gettimeofday()
  and os.tmpdir() have been added.

* lua now comes with the coroutine (coco) patches from the
  luajit project applied.

* the banner line no longer claims to be TeX.

* a bunch of bugs reported on the mailing list have been
  fixed (I hope all of them).

* (internal) we found lots of small ways to speed up lua
  node processing.

* (internal) the node (de)allocation functions have been
  rewritten, so that absolutely all nodes now have a type,
  even the ones with variable sizes. 


==============================================================
Luatex snapshot-20071029 was released 20071029
==============================================================

* Completely overhauled hyphenation and ligkern application.

  There is a new chapter in the manual to document all the
  changes to the hyphenation and line breaking algorithms,
  it is simply too much to list here.

* the interface of the pre_linebreak_filter,hpack_filter,
  vpack_filter, and pre_output_filter has changed slightly.

* lpeg is now at version 0.7

* a whole series of exotic bugs and compiler warnings are
  fixed thanks to the watchful eye of Fabrice.

* texio.print now accepts multiple strings as arguments.

* The lua function os.sleep() is added 

==============================================================
Luatex beta-0.11.2 was released 20070918
==============================================================

* Pdf inclusion and subsetting of CID-based opentype fonts
  now works as it should.

==============================================================
Luatex beta-0.11.1 was released 20070918
==============================================================

A quick list of what is new and fixed since beta 0.10.2:

New:
* pfb+afm fonts can now be used in 'wide' (encodingbytes=2) mode
* searching in PDFS using 'wide' fonts now works reasonably well
  (based on the tounicode feature)
* related to that, tounicode information can now be passed
  on inside the font metrics table
* font subsetting is now supported for CID-based OpenType fonts
  (however, there is a known bug with KpozMinProVI-Regular.otf)
* fontforge's warning and error messages are now intercepted
  and passed on to the lua code as a second return value of
  the fontforge.open() function
* the new primitive \suppressfontnotfounderror can suppress
  the TeX error for "Font not found"
* The lua function font.current can now be used to set TeX's
  current font

Fixes:
* set_attribute(-1) is now the same as unset_attribute()
* OpenType lookups with glyph classes would crash luatex
* luazlib would not compile on debian (fix from Norbert)
* CID-based fonts would crash luatex
* Bare CFF should be read in binary mode (fix from Akira)
* VF processing did not process packets containing zero bytes properly
* the truetype collection (.ttc) handling is fixed, so that all
  of the fonts inside a collection can now be used reliably
* application segfaults and stack overflows are intercepted
  so that luatex can quit a bit more gracefully
* an assertion failuer on systems with signed chars (linux-powerpc)
  is fixed
* a crash on AMD64 linux was fixed
* the lua "pdf" table code was wrong
* \ifcsname did not work properly for UTF-8 characters
* Use of the math-related functions using make_fraction (like \atop)
  caused a crash
* \handling of \if\noexpand was wrong
* applied a patch that cleans up XForm and page calculations
* "autoconf" support from zziplib is stripped 

==============================================================
Luatex beta-0.10.2 was released 20070814
==============================================================

Bugs fixed:

* the primitive \span was completely broken
* \pdfexpandfont (font expansion) misbehaved if it was used more
   than once
* virtual fonts: sometimes they used the wrong internal font id,
   loading vf fonts via fonts.read_vf() was impossible, and sometimes
   virtual fonts created segfaults
* while dumping formats, the last font parameter for each font was not
   dumped at all
* zziplib was always compiled with pre-installed zlib headers, instead
   of the ones in the build tree
* lua 5.1.2 has trouble quoting ^Z characters etc, the tentative patch
   for lua 5.2 from Luiz fixes that, hopefully
* fontforge.font('font.pfb') now properly parses AFM boundingboxes
* non-existing files in the argument for fontforge.open() or
   fontforge.info() could cause segfaults, now it generates an error
   instead
* fontforge.open() did not return character widths for vertical fonts
   as it should
* on Windows, fontforge believed that ttc files (TrueType Collections)
   were actually directories. ttc processing is still not 100% correct,
   but it is getting better
* the build system used explicit 'make' sometimes
* the auto-growing string pool was not used everywhere
* there were some typos in the documentation parts of the pascal web
* use of \parshape could easily exhaust all available memory


New features:

* support for applying Adobe Feature files (.fea) and Adobe Font
   Metrics (.afm) is added to the fontforge library
* fontforge.info() will now return an array of tables for the contents
   for ttc files
* support for a 'texluac' personality was added, to replace the 'luac'
   command from the official Lua distribution

==============================================================
Luatex beta-0.10.1 was released 20070719
==============================================================

This was a hotfix because beta-0.10.0 was completely broken.

==============================================================
Luatex beta-0.10.0 was released 20070718
==============================================================

The latest version of the manual is included in the package, and I
am not going to repeat all of that. There were some minor changes
compared to the previous snapshot, but mostly just bugfixes and
documentation improvements.

==============================================================
Luatex snapshot-20070626 was released 20070626
==============================================================

* Integrated the lua library lzlib, this defines tables with
   bindings for zlib (including eazy-to-use gzip support)
* Updated to slnunicode version 1.1
* Some small cleanups in the sparse array handling
* Moved the raw byte support out of the valid unicode range
* Fixed a bug in the OFM font reader
* Removed the pdftex snap nodes (and associated primitives)


==============================================================
Luatex snapshot-20070622 was released 20070622
==============================================================

Not a lot of news, but it fixes a few important bugs in the lua 
node processing. Also a few utility functions are added:

* tex.round()
   rounds and bounds checks a lua number to make sure it is
   a valid tex integer.
* tex.scale()
   multiplies a number (or the numeric values in a table)
   with a fixed quantity, and calls tex.round() on the result.
* node.has_field()
   Test if a node has a specified field name
* node.remove()
   removes a node from a nodelist, while keeping the list intact
* node.insert_before()
   inserts a new node into a nodelist, just before a specified
   location node
* node.insert_before()
   inserts a new node into a nodelist, just after a specified
   location node
* node.hpack()
   packages a nodelist into a hlist node


==============================================================
Luatex snapshot-20070619 was released 20070619
==============================================================

* The lua node processing interface is completely reworked.
   It is now completely based on userdata, and uses a new lua table
   called 'node' to hold the methods. More detailed information
   is in the manual (of course).

* There is a fifth node processing callback:
      pre_output_filter
   this is executed just before the packaging of \box 255.

* The hpack_filter and pre_linebreak_filter callbacks now
   receive an extra argument indicating the number of top-level
   glyphs in the node list.

* Virtual fonts can now contain a 'node' key in the glyph
   commands: the value should be a hlist node (i.e.: a horizontal
   box), and that will then be output for each character access
   in that font.

* A new set of registers is added, called \attribute. These are
   values that will be automatically attached to nodes created in
   their scope. More information in the manual.

* Direct read/write access to TeX's box registers is addded to
   the lua 'tex' table.

* TeX's main memory now grows dynamically, and the (de)allocation
   routines have been rewritten completely.

* The 'kpse' table is extended with extra interface functions, to
   allow texlua to be used as a scripting engine.

* The \pdftexversion command now returns 200, not 140.

* The displayed banner and --version screens are cleaned up.

* The format file is now RLE compressed. Not as small as before,
   but unpacking is much faster.


==============================================================
Luatex snapshot-20070426 was released 20070426
==============================================================

This past month I have been busy with nodes and lists of nodes,
so the big new feature in this release is that there are four
callbacks that operate on node lists:

  buildpage_filter
  pre_linebreak_filter
  hpack_filter
  vpack_filter

The preliminary documentation for these is in the manual, but the basic
idea is that you can filter a node list just before LuaTeX starts doing
something with it (like line breaking). This functionality is not stable
yet: the node presentation of the various node types is pretty much OK
now, but keep in mind the following:

  * math noads and math typesetting are not handled at all (yet)
  * not all hpacks and vpacks are intercepted (yet)
  * the nested node list handling will probably change
  * A conversion tool for nodes to/from dictionaries is planned,
    but not done yet

The other changes in this snapshot are various bugfixes (for builds
on various platforms as well as font issues) and speedups (in the 
execution of callbacks and the creation of lua font representations).


==============================================================
Luatex snapshot-20070322 was released 20070322
==============================================================

* I have changed the token_filter callback quite rigorously,
   mostly because of speed issues. The raw speed of trivial
   lua token handling is now only about 20 times slower than
   the native handling. Not bad at all, considering it has to move
   between interpreted and compiled code for each and every
   token. If you do not run the token filter inside \output,
   the effective run speed difference should not be much more
   than a factor 1.5.

   Two big differences: you have to call token.get_next()
   yourself, and the token table is now a three-item array
   instead of a five-key hash. The minimal example changes to

   \directlua0{
     callback.register('token_filter', function ()
       return token.get_next()
       end)
   }

   more details are in the manual.

* I've fixed a few bugs in the handling of Opentype TTF, and added
   a new key in the font definition table:

      f.encodingbytes = (1|2)

   The default is 2 for opentype and truetype format, 1 otherwise.
   Later on, it will become possible to have a type1 font in 2-byte
   (CID) encoding or a truetype font in traditional encoding (1-byte),
   but I have not covered all cases yet.



==============================================================
Luatex snapshot-20070309 was released 20070309
==============================================================

* The OCP debug information is removed again.

* There is a new callback that I am quite excited about myself:
   'token_filter'.


A bit of text from the reference manual:
--------------------
This callback allows you to change the modify any lexical token that
enters the \type{main_control} function before \LUATEX\ executes the
associated command.

Note: not all tokens can be intercepted yet, only those that are `seen'
by \LUATEX's main control function.  Supplemental tokens like the bodies
of macro definitions and the right-hand side of register assignments
are not seen. For now, this is intentional.

\startfunctioncall
      function (table <token>)
         return table <token>
      end
\stopfunctioncall

Calling convention for this callback is bit more complicated then for
most other callbacks.  Initially, lua function will be called with the
next token from \type{get_next()} as argument, represented as a small
lua table.  The function should either return a lua table representing
a valid to-be-processed token, or something else like nil or an empty
table.

If your lua function does not return a table representing a valid
token, it will be immediately called again with yet another token
from \type{get_next()} as argument, until it eventually does return
a useful token.

But if the function does return a usable token, then that token will
be processed by \LUATEX. Afterwards, the function will be called
again, but now without an argument. This is repeated until it stops
returning tokens.  Then processing reverts back to the other branch.

The point behind that roundabout calling convention is that it
allows the lua function to buffer tokens for various uses. That in
turn makes it possible to do some really advanced things like
replacing OTPs.

Now about that table. The table that the function will receive
contains four fields:

\starttabulate[|l|i|p|]
\NC Key     \NC  type    \NC                Explanation \NC\FR
\NC cmd     \NC  string \NC A representation of  \LUATEX's internal
                             command code\NC\NR
\NC chr     \NC  number \NC The command code modifier\NC\NR
\NC cs      \NC  string \NC If the token came from a csname, this
                             is  that csname\NC\NR
\NC mod     \NC character \NC A single character string representing
the current processing mode. One of {\bf v}ertical, {\bf h}orizontal,
display {\bf m}ath, {\bf n}o, internal {\bf V}ertical, 
            restricted {\bf H}orizontal, or inline {\bf M}ath mode.\NC\LR
\stoptabulate

If you modify the table before returning it, then it is wise to return 
either a (\type{cmd}, \type{chr}) pair, or a \type{cs} string.  That is
because if both options are present, the pair has precedence and the
string is ignored. On the return table, {\bf mod} is ignored always.
--------------

I have no long example code yet and it is not as complete as one
would want it to be because it is not intercepting everything that
comes in, only the bits that are triggered by the main control
loop.

I decided to do a fast snapshot release for two reasons:

* It is one of the easier extensions to get started with if you want
   to learn a bit about lua programming

* I would welcome feedback on the token interface, because it will
   be needed in other places as well, soon. I am still not sure
   whether converting the command to/from strings is worth it, for
   example. And maybe it would be less confusing if you could return
   a list of tokens instead of being called repeatedly?

Here is the trivial example to get you started:

    \directlua0{
      callback.register('token_filter', function (t) return t end)
    }


==============================================================
Luatex snapshot-20070307 was released 20070307
==============================================================


* Non-CID PostScript-based Opentype fonts are now combined over
   the entire document, and properly subsetted. The code is
   borrowed from xdvipdfmx with some minor adjustments

   Adding support for CID-keyed OpenType fonts would not be hard
   but at the moment I lack example input (and incentive).

* A small extension to the virtual fonts structure: you can use

     f.fonts[1] = { 'id' = 38}

   to do a backreference to a previously defined font. This saves quite
   a few computations

* There was a bug in the handling of \leaders in the output whereby
   it's width was taken to be twice what it should be while writing
   to the PDF, fixed now.

* The font inclusion code is cleaned up a bit by Hartmut.

* Some compilation problems were fixed.

* There is (quite a bit of) debugging information printed out when
   OTPs are in use, because I am tracking down a bug reported by Idris.

   The input of each and every OTP step is shown on the terminal in
   a line line this:

     [57902][1568][58423][1568][58408][1568][58921]

   those are the decimal values of ocp i/o characters. If you don't
   need them, don't worry about it.

==============================================================
Luatex snapshot-20070302 was released 20070302
==============================================================

* The 'snapshot version' banner is now calculated dynamically
  at build time. This aids in figuring out what binary people
  are actually running, but it can possibly break the build on
  systems that do not have a `date` command.

* The do_vf() function that checks for virtual font existance
  is now run immediately after the font definition instead of
  being postponed until characters are output.

* The 'define_font' callback interface has changed a little.
  It is now:
    retval = function (name,size,fontid)

  where fontid is the internal font number of the font that
  is currently being defined, and retval can be either a table
  (as before) or a different, previously defined fontid. This is
  useful if a previous definition can be reused instead of
  creating a whole new font structure.

* The internal font data structure has been redone. Glyph index
  inside a font is now handled by a sparse array, so that use
  of e.g. 0xFB01 (fi-ligature) no longer creates a 64000+ entries
  character array.

* The internal cache-ing of font metric information is turned
  off completely, because it was based on the assumption that
  name + size were a unique identifier for a font. This can no
  longer be guaranteed.

* word boundary processing now works OK again, thanks to the
  introduction of two virtual characters in the font table
  definition. Besides the normal numeric entries in the
  f.characters table, there can now also be two string keys:
  "left_boundary" and "right_boundary". The  ligatures and kerns
  of the 'left_boundary' character are used for the pre-word
  boundary processing, ligatures and kerns between characters
  and 'right_boundary' are used for the post-word processing.

* Lua font table references are no longer cached by the
  executable ,in order to preserve memory. (the only downside
  is that font.fonts[] access is now slower because of the need
  to recreate the lua table).

* There are other some small changes to the font table formats.
  Please see the manual for details.

* A 'real' font can now still have virtual characters if they
  are loaded via lua. Just set the 'commands' section and/or
  the 'fonts' array to your liking, and it should work out.

  If you have created no 'fonts' array at all, then the default
  font (indentifier '1')  is the current font, so that you
  can create virtual duplicates of already existing characters.

  Note: this does not work the other way. There can not be
  'real' characters in a virtual font!

* Truetype-based opentype fonts no longer require Acrobat 7
  t(hey are now written out as if they are normal truetype).

* A lua init script can now set 'texconfig.formatname' and/or
  'texconfig.jobname'. If ther is no file or format specified
  on the commandline, then, if, one of those keys is present,
  that key will be used instead of simply quitting with an
  error.

* Placement of boxes and rules in right-to-left mode is debugged,
  and now seems to work ok.

* Virtual font loading is debugged.

* Some memory leaks are resolved

* HZ font expansion should work ok again, but is not tested.

* a few of the warning during opentype loading have been removed
  because the problems are rather harmless and turned out to be
  triggered by almost every font.


==============================================================
Luatex snapshot-20070218 was released 20070218
==============================================================

* The pdftex stuff is now updated to 1.40.3
  (and on top of that, it still has those extra patches announced in
  snapshot 20070202)

* The virtual font parser is debugged and now appears rather stable.

* There is one extra virtual command:

    "commands" = {
       {"slot", 1, 97}, -- place character 97 'a' in local font 1.
     }

  This is just a shortcut for {"font",1}, {"char", 97}

* Some small memory leaks have been fixed. Luatex does not leak big
  time, but I'd like to get back to valgrind reporting '0 out of 0',
  instead of the current 800 bytes or so (that is a slow process).

* You can read a truetype or opentype font from within lua code
  using font.read_ttf() or font.read_otf(), respectively.

  This feature uses a fair bit of the fontforge code, making the
  binary rather a bit larger than before. Just so you know.

  Apple (AAT, as well as encoding) support is still largely missing,
  and bitmap-only and old Multiple-Master truetype fonts are not
  supported at all (and never will be).

  The output format is (shadily) documented in the reference manual.
  At the moment, it very closely resembles the internal font stucture
  that is used by fontforge.

* LuaTeX can now write wide OpenType fonts to the PDF file.

  There is no subsetting support yet, and a ToUnicode CMap is also
  still missing, but nevertheless it is already somewhat useful. The
  rule is very simple: if a font uses code points above 255, then it
  is considered to be a `wide' font, and it will be written out as
  a Type0 CID-keyed font to the PDF.

  Caveat: Getting suitable metrics into LuaTeX can be a bit of problem
  right now, because font.read_otf() does not produce anything that
  can be fed back into define_font without extra processing.  Hans has
  some experimental Lua code for ConTeXt (of course :-)) and that is
  how I know it works.  You can expect a nicer interface soon,
  hopefully next week, in the form of a simplistic table conversion
  routine.

* I have started work on supporting Aleph's bidi typesetting in PDF
  mode as well, simple text seems to be largely ok. More complicated
  documents will no doubt still show some bugs, but fixing those will
  be easy (once they are discovered). Exactly what happens with specials
  is not yet investigated.

* Omega's (16-bit) wide virtual fonts now work OK in PDF mode. This
  means that many Aleph files can now be run in PDF mode directly.
  (the documents that use UTF-8 input encoding)


==============================================================
Luatex snapshot-20070202 was released 20070202
==============================================================


* The pdftex stuff is now updated to 1.40.2, and on top of that, it has

   - an extra patch from Han The Thanh that adds a primitive to control
     the merging of fonts from external pdf images (\pdfreplacefonts),
     and a bugfix for virtual font handling.

   - an extra patch by Hartmut Henkel that removes a number of malloc()s
     and free()s from the calls to the compression library, thereby
     making luatex run a bit faster.

* luatex now happily accepts the following low-level syntax:
	
    \font\myfont = <general text> <at specifier>

   It feeds the <general text> to either kpathsea or a lua script for
   further processing after stripping the braces.

   In itself, this is not all that useful, but the reason for this
   syntax extension is that it paves the road for a macro package
   to do something like this:

    \font\myfont = {font="Times New Roman", color="\darkred",
                    encoding="ec", features="liga", size=10bp}

   without having to resort to system-specific quoting mechanisms.
   Macro (and other) expansion takes inside the braced argument.

   (I am considering adding this extension to \input as well).

* It is now possible to define a font into the font.fonts[]
   directly from lua, but becayse use is limited, I am only
   mentioning it to be complete.
	
   Syntax:	
	<number> id = font.define(<table> font)

* There is a (not very reliable yet) virtual font parser accessible
   from lua.

   Syntax:
	<table> vfdata = font.read_vf(<string> name, <number> size)

   The interpreter tries to give a reasonable representation of a
   virtual font file (the .vf file). Besides a few simple top-level
   items:

     designsize  -- in scaled points
     size        -- also in sp
     name        -- the file name
     checksum    -- the vf checksum
     header      -- the header comment  (if any)

   it also has a top-level array 'fonts' wherein each item is a mini-
   array describing one of te mapped fonts. An example makes this
   easy to understand

    "fonts" = { {"ptmr8a",655360}, {"psyr", 600000} }

   says that the first referenced font (index 1) in this virtual font
   is ptrmr8a.tfm loaded at 10pt,  and the second is psyr.tfm loaded
   at a little over 9pt. These index numbers are used by the character
   command definitions that follow.

   At top level, there is a 'characters' array, just as for a normal
   font, except that each item has only two keys:

     "width"    -- the tfm width (as stored in the .vf)
     "commands" -- an array of virtual font commands for a character.

   each of the items in the 'commands' array is itself a tiny hash.

   Each of those mini-hashes represents a single character packet
   command. Here is a 'commands' entry that contains every possible
   one at least once:

     "commands" = {
        {"push"},                     -- remember where we are
        {"right", 5000},              -- move right 0.08pt
        {"font", 1},                  -- select the fonts[1] entry
        {"setchar", 97},              -- place character 97 'a'
        {"pop"},                      -- go all the way back
        {"down", -200000},            -- move *up* about 3pt
        {"special", "pdf: 1 0 0 rg"}  -- switch to red color
        {"rule", 500000, 20000}       -- draw a bar
        {'special',"pdf: 0 g"}        -- back to black
      }


* But the big news is that you can now define your own virtual fonts
   on the fly, by adding a few statements to the table returned to
   the 'define_font' callback.

   There are a few requirements:

   - The table has to have a top-level key 'type', and it's value
     must be 'virtual'.

     The presence of this key with the specific value 'virtual'
     will trigger handling of the rest of the special virtual font
     fields in the table, but the mere existance of 'type' is
     enough to prevent luatex from looking for a virtual font
     on its own.

     Therefore, this also works 'in reverse': if you are absolutely
     certain that a font is not a virtual font, assigning the value
     'base' or 'real' to 'type' will inhibit tex from looking for a
     virtual font file, thereby saving you a disk search.

   - There must be a top-level 'fonts' array, as explained above.
     Any fonts that are not yet known to luatex at that moment,
     will be loaded automatically (Warning: do not ever use a font
     in 'fonts' with the same name you will return in the table you
     are defining right now!).

   - Each and every character in the fonts needs to have a 'commands'
     key, as explained above.

   The main point behind these restrictions is that a font is
   *either* a base font *or* a virtual font. It cannot be both
   at the same time.


==============================================================
Luatex snapshot-20070126 was released 20070126
==============================================================


* Underscores in pascal identifiers are now retained.

   This took quite a bit of work. The web2c conversion tools
   needed only small adjustments, but most of the existing C
   code depended on the removal of the underscores. I had to
   go through changing many lines. 99% of all identifiers are
   now written the same on the pascal side as on the C side.
   This makes writing interface code quite a bit less confusing.

   Not everything is completely clean yet, because I did
   not want to change the web2c-specific C files. I often
   took the other approach and removed the underscores
   from the web2c options (like 'parsefirstlinep') in the
   change file instead. Ugly, but predictable.

   There is about a dozen or so of #defines left, that map
	memoryword -> memory_word
         strpool    -> str_pool
   etc.

* The virtual font parsing and interpreting is now done in C.
   (this is because it needs to be interfaced with the lua-based
   font loader)

* I am in the process of merging: the VF stuff; the TFM stuff;
   the lua font loading; and the pdftex font backend into one
   interface, so there were some smallish changes relating to
   that as well. Nothing worth mentioning just yet except that
   luatex now will read "ovf" files as well as "vf" files.

* There are a few really small bugfixes for bug reports I received
  on this list and by email.

==============================================================
Luatex snapshot-20070119 was released 20070119
==============================================================

The largest new bit is the existence of a font.fonts array, that you
can use to query/adjust the internal defined tex fonts. See the manual
for more details.

Two small new lua extensions are added as well:

   * os.setenv() -- to change the environment
   * os.exec()   -- a non-returning os.execute()

And a bit of cleanup in the commandline processing.


==============================================================
Luatex snapshot-20070117 was released 20070117
==============================================================

* the pdftex core is updated to 1.40.1, and web2c to 7.5.6

* the pdftex-specific documentation is removed

* lua lpeg library updated to 0.4
   ( http://www.inf.puc-rio.br/~roberto/lpeg.html )

* the C part of the lua md5 library is added to the binary
   ( http://www.inf.puc-rio.br/~roberto/md5/md5-5/md5.html )

* --luaonly now puts the script itself at arg[0], and
   preceding commandline items in the negative indices
   (instead of starting the count at zero).
   This new approach is compatible with the standalone lua
   interpreter.


==============================================================
Luatex snapshot-20070107 was released 20070107
==============================================================

Hot on the heels of 20070105, a new snapshot. It turns out
that using the callback to define a font broke all ligatures.
This snapshot fixes that, and it has a few minor updates to
the manual. Next shapshot will be after the inclusion of
pdftex 1.40.1. 

==============================================================
Luatex snapshot-20070105 was released 20070105
==============================================================

 * the calculations that converted lua strings into tex units
   were horrendously wrong, this was discovered by Pawel.

 * io.lines() was still using the old, line ending sensitive,
   code from the lua core distribution

 * The main font memory is allocated as needed^(1) instead of
   statically pre-allocated.

 * ligatures and kerns are separated completely from each other,
   so use of \noligatures no longer inhibits kerning as well

 * Metrics can be loaded using a callback: 'define_font'.
   The value returned should be a lua table representing a tfm
   file.

 * there is a new lua table: font. It has one function:   
   font.read_tfm() that returns a table reprentation of the tfm
   contents, for use with the above mentioned callback

 * I dropped suppport for "Level 1" OFM files. I would like
   to have a try at those extended font files, but I lack
   examples (fonts nor documents). I am not even sure such
   fonts have ever existed in the 'real world'.



==============================================================
Luatex snapshot-20061208 was released 20061208
==============================================================

* There is a new switch: --safer. This disables a number of lua
   functions that are more or less dangerous (a detailed list is
   in the manual)

* Two longstanding bugs have been fixed: \latelua works once
   again (patch by Hartmut) and a bug that caused mysterious crashes
   turned out to be a problem inside the paragraph builder
   (reconstitution of ligatures)

* Six new string iterators have been added to the string library:
      string.characters        (one 1-letter string)
      string.bytes             (one byte)
      string.characterpairs    (two 1-letter strings)
      string.bytepairs         (two bytes)
      string.utfcharacters     (a one-character utf-8 string)
      string.utfvalues         (a unicode code point number)

* The top 256 values of the unicode range (starting at hex
   value "10FF00) are now reserved for byte output. Characters
   in that range will be written by luatex after substracting
   that offset. The net result is that \char"10FFA9 is written
   as byte value hex A9 = decimal 169 = copyright sign in latin1

   This trick allows byte-oriented output to \pdfliterals and
   \specials, but should be considered very experimental.

* There is a new callback called 'process_input_buffer' that can
    be used to mutate the line buffer just before LuaTeX actually
    starts looking at it.

* The statistics table now has readable items
	statistics.inputid
	statistics.lasterrorstring
    that represent TeX's current input id and the last error string

* The show_error_hook callback no longer receives any arguments
* There is a new switch: --safer. This disables a number of lua
   functions that are more or less dangerous (a detailed list is
   in the manual)

* Two longstanding bugs have been fixed: \latelua works once
   again (patch by Hartmut) and a bug that caused mysterious crashes
   turned out to be a problem inside the paragraph builder
   (reconstitution of ligatures)

* Six new string iterators have been added to the string library:
      string.characters        (one 1-letter string)
      string.bytes             (one byte)
      string.characterpairs    (two 1-letter strings)
      string.bytepairs         (two bytes)
      string.utfcharacters     (a one-character utf-8 string)
      string.utfvalues         (a unicode code point number)

* The top 256 values of the unicode range (starting at hex
   value "10FF00) are now reserved for byte output. Characters
   in that range will be written by luatex after substracting
   that offset. The net result is that \char"10FFA9 is written
   as byte value hex A9 = decimal 169 = copyright sign in latin1

   This trick allows byte-oriented output to \pdfliterals and
   \specials, but should be considered very experimental.

* There is a new callback called 'process_input_buffer' that can
    be used to mutate the line buffer just before LuaTeX actually
    starts looking at it.

* The statistics table now has readable items
	statistics.inputid
	statistics.lasterrorstring
    that represent TeX's current input id and the last error string

* The show_error_hook callback no longer receives any arguments

* The statistics table now has readable items
	statistics.luabytecodes
	statistics.luastates
	statistics.luabytecode_bytes
	statistics.luastate_bytes
   for memory statistics reporting


* The statistics table now has readable items
	statistics.luabytecodes
	statistics.luastates
	statistics.luabytecode_bytes
	statistics.luastate_bytes
   for memory statistics reporting


==============================================================
Luatex snapshot-20061204 was released 20061204
==============================================================

* The LuaTeX interpreter can now be run as a standalone lua script
  processor, by using a commandline like this:

    luatex --luaonly=luatools.lua

* Luafilesystem (http://www.keplerproject.org/luafilesystem/ ) is
  included.

* There are a total of eight new file discovery callbacks:
    find_vf_file
    find_ocp_file
    find_map_file
    find_enc_file
    find_sfd_file
    find_pk_file
    find_data_file
    find_opentype_file
  this enhances the orthogonality of the callback system, nothing
  fundamental is changed.

* There is a new callback called 'process_input_buffer' that can
  be used to mutate the line buffer just before LuaTeX actually
  starts looking at it.

* The 'reader' and 'close' functions from 'open_read_file' now
  receive the table they are defined in as a function argument,
  that can be used as a per file localized data store.

* Updated the Lua to the latest 5.1.1, with all known bug patches
  from the website applied as well

* Runtime autoloading of lua .so files is now off on all platforms.

* The statistics table now has readable items
    statistics.filename
    statistics.linenumber
  that represent TeX's current file name and line number

* The support for user-defined type3 font .pgc files and the
  associated 'read_miscfonts_file' callback has been removed.
  (nobody used it anyway)

* General cleanups to the source tree and build process. 

==============================================================
Luatex snapshot-20061023 was released 20061023
==============================================================

* there was a missing callback: find_font_file
* program_invocation_name was not set
* buf_size could not be more that 300k


==============================================================
Luatex snapshot-20061013 was released 20061013
==============================================================

Last friday I uploaded a new snapshot and today I finally
finished updating the manual to go with it. The changes all
relate to startup, file i/o, and callbacks. The main achievement
is: you can now run luatex without it *ever* initializing kpathsea.

Because I am lazy, I have checked in the pdf of the manual
as well, so that I can say: Please look at

  https://foundry.supelec.fr/plugins/scmsvn/viewcvs.php/manual/
    /luatexref-t.pdf?root=luatex&rev=148&view=log

for all the details.  :-) 

==============================================================
Luatex snapshot-20061002 was released 20061002
==============================================================


* Some infrastructure changes:

  libs/slnunicode-0.9.1/ renamed to libs/slnunicode/
  libs/zziplib added
  libs/luazip added

  (zziplib is using a different version of autofoo. I know I have
  messed up something in the build process, but the bit we need
  compiles ok so I've postponed attempting to fix it)

* The callback logic has changed quite a bit.

  - all callbacks are now only possible in lua state 0.

  - The callback 'input_line' has disappeared, and is replaced by
    'open_read_file'. One of the return values of that callback
    is a table that defines a 'reader' function for line reading.

    See the manual for further information on this.

  - There are some new callbacks for the reading of various binary
    files. The current ones are:

    "read_ocp_file", "read_vf_file", "read_data_file", "read_font_file",
    "read_map_file".

    The rest of the file types will follow soon (fonts, enc files, and
    images).

  - There are also some new callbacks that 'find' a file's pathname:

    "find_truetype_file", "find_type1_file", "find_image_file"

    here too, more will follow later.

  - the functions from io. that were copied to texio have been removed
    again. The new callbacks do not pass file pointers around, so
    they ere not longer needed

  - the 'open_write_file' is temporarily unavailable

* startup.lua is now always loaded into lua state 0

* The luazip library from kepler is linked in, so there the table 'zip'
  is accessible from all lua states. 

==============================================================
Luatex snapshot-20060922 was released 20060922
==============================================================

* The texio table has gained a new function:

     tex_file = texio.open(filename)

   returns a file handle of a type that luatex can use
   internally (the return of io.open is unusable in callbacks
   because it will be garbage-collected at a random time)


* In related news, there are two new callbacks you can define:
	
	callback.register('open_read_file', f)
	callback.register('open_write_file', f)

   where your function should have the following conventions:

   function f (number id_number, string asked_name)
      return boolean success, string actual_name, tex_file filep
   end

   id_number:   zero for the log or \input files  or TeX's \read
                number incremented by one (\read0 becomes 1).
   asked_name:  the user-supplied filename

   success:     return false for error, true otherwise.

   The remaining two items are only looked at if you return true:

   actual_name:  the true filename used (with extension!)
   filep:        a file object opened though texio.open()


* The tex.print function has an extra optional parameter:

       tex.print(ctt_id n, strings ...)

   This prints the strings using the catcode regime defined by
   \catcodetable n (assuming n is valid, see below)

* The new function tex.sprint has the same lua conventions as
   tex.print, but behaces slightly different on the tex side:

   ** tex does not switch to the 'new_line' state (this implies
      that leading spaces are not ignored)
   ** no \endlinechars are inserted
   ** trailing spaces are not removed from the argument

* Catcode tables are a completely new feature, that allows
   you to switch the current catcode regime in one simple
   statement:

   \catcodetable <count>

      Switches to the use of a different set of catcodes (table),
      that is stored under the number <count>. Such a table has to
      be previously created using one of the two command below, or
      the number 0 (which is pre-inititialized)

      This command obeys normal grouping rules.

   \initcatcodetable <count>

      creates a new, global, independent catcode table with catcodes
      matching the code that are predefined by initex (tex -ini).

     This allocation is global

   \savecatcodetable <count>

      copies the current set of catcodes to a new, global, table
      with id number <count>. The definitions in this new table
      are all treated as if they were made in the outermost level.

     This allocation is global

   At the end of each grouping level, items within all existing
   catcodetables are restored, regardless of which one is the
   currently active table.

   Catcode table numbers cannot be larger than 0xFFFFFFF (228-1)

* There is a new lua table: lua. It contains three read-only
   items:

     lua.id          -- the id number of the instance
     lua.version     -- a luatex version identifier string
     lua.startupfile -- the full filename (+path) of startup.lua

   and it also contains a read/write array:

     lua.bytecode[]  -- lua executable bytecode

   This array can be used to save and restore lua functions
   across lua states. The accepted values are for assignments
   are functions and nil. Likewise, the retrieved value is
   either a function or nil.

   The contents of the lua.bytecode array is stored inside the
   format file, so it can also be used to preload lua code.


* The format files are quire a bit smaller than before


==============================================================
Luatex snapshot-20060915 was released 20060915
==============================================================

* There is a new TEX primitive: \formatname. It is similar
  to \jobname (read-only). In initex, the expansion is empty,
  otherwise the expansion is the same as the \jobname from
  the initex run.

* the lua "tex" table has been expanded with a few of the 'convert'
  codes (read-only). The supported ones at this moment are:

  tex.eTeXVersion
  tex.OmegaVersion
  tex.AlephVersion
  tex.pdftexrevision
  tex.pdftexbanner
  tex.pdfnormaldeviate
  tex.jobname
  tex.formatname
  tex.eTeXrevision
  tex.Omegarevision
  tex.Alephrevision

  This list looks haphazard,  but it really is not. These are
  all the cases of the 'convert' internal command that do not
  require an argument.

* The metatables of the subtables like tex.dimen[] etc. are now
  adjustable from lua (not that I recommend doing that;-)).

* On the lua side, there is a new global value: "luaid"
  It holds the internal id number of this \directlua instance.

* There is a new lua table, "callback", that has the single function
  "callback.register", used to register callbacks.   This replaces
  the previous concoction (see my message about snapshot 20060901).
  Syntax is :

  callback.register(<callback name>,function (f) ... end)

  where the <callback name> is for the moment, either "input_line"
  or "show_error_hook".

  This function internalizes the callback function in such a way
  that you no longer have to worry about \luacallback (which has
  been removed), nor does it matter if you redefine a function
  accidentally.

 The internal testing for callback presence is also quite a bit
 faster, thanks to this change. Callback assignments are global
 and the "input_line" always takes effect starting on the next
 input line to be read from an actual file.


* \detokenizedlua has been removed. It is functionally replaced by
  the new function call tex.write("").

  Each argument to each call of tex.write () counts as an input
  line, but:
  ** all catcodes on that line are either 'space' (for " ") or
     'character' for all others.
  ** there is no \newlinechar appended.

* The implementation of tex.print() has changed as well:

  ** the very last tex.print() line from a \directlua
     will no longer have a trailing \newlinechar
     (this is very convenient when \directlua is used
     within an \edef)
  ** tex.print() is quite a lot faster than before, and the total amount
     of returnable text from a \directlua is now only limited by
     available system RAM. However, each separate tex.print ()
     argument has to fit in TeX's input buffer.

* The new primitive \luastartup can be set inside the format file
  to specify the lua instance number in which a possible runtime
  startup.lua script is executed (initex always uses 0)

* There is a new primitive \scantextokens. Differences with
  eTeX's \scantokens are:

  ** the last line (usually only) from \scantextokens
     does not have a \newlinechar

  ** \scantextokens never raises an eof error.

  This means things like

  \edef\testone
        {\scantextokens{\ifnum1=1 true}\else false\fi}

  are legal input (but potentially dangerous!).

* If you say
     local d  = tex.dimen["unknowndimen"]
  'd' will now become "nil" instead of raising an error

   However,
     tex.dimen["unknowndimen"] = d
   is still (and probably will remain) illegal 

==============================================================
Luatex snapshot-20060908 was released 20060908
==============================================================

* BIG CHANGE: \directlua now runs \scantokens internally.

  There is no longer a need to call scantokens yourself, the
  tex.print() output is now fed straight into a pseudo file.
  This is quite a bit faster as well as easier to use, but
  just in case you want it, the old behaviour is still present,
  under the new name

    \detokenizedlua


* The texio library now has its own (partial) set of I/O commands,
  so that the standard lua io library is back to the distributed
  state (no more patched garbage collector)

  Note: This is really a very small change (it should not have any
  impact on wellbehaved input files), but I attempt to be complete
  in these notes, since there is no official documentation yet.


* There is a new standard library available: kpse

  The most important function in that library is find_file:

    string = kpse.find_file(string filename
                            [,string type]
                            [,boolean mustexist])

  both "type" and "mustexist" are optional, so the function
  has from one upto three arguments.

  "type" is like the '-format' argument of kpsewhich. You can
     run 'kpsewich -h'  for a list. The default type is "tex".

  "mustexist" is like '-must-exist', and the default  is false.
     If you specify "true" (or a nonzero integer), then the kpse
     library will search the disk as well as the ls-R databases

  The new library also has three other functions that map
  straight to kpsewhich commandline options:

    string = kpse.expand_path(string)
    string = kpse.expand_var(string)
    string = kpse.expand_braces(string)

* There is a second callback possibility:

    texio.show_error_hook(string message,
                          string|number indicator,
                          number lineno)

  This command is run from inside the TeX error function, and the
  idea is to allow you to do some extra reporting on top of what
  TeX already does (none of the normal actions are removed).

  "message" is the formal error message tex has given to the
     user (the line after the "! ")
  "indicator" is either a filename (when it is a string) or a
     location indicator (a number) that can means lots of different
     things like a token list id or a \read number.
  "lineno"  is the current line number

  This is an investigative item only, comments are welcome but do
  not take the syntax seriously.

  The final goal IMO is the total replacement of TeX's error
  handling routines, but that needs lots of adjustments
  in the web source because TeX deals with errors in a somewhat
  haphazard fashion (it needs unification first). The current
  hook is only for 'testing the water'.

* It is now possible to use named items in the

    tex.count[]
    tex.dimen[]
    tex.toks[]

  subtables, so you can have

    tex.count.scratchcounter = 0
        local enormous = tex.dimen["maxdimen"]

  Luatex looks up the value for you on the fly. You have to use a
  valid \countdef (or \dimendef, or \toksdef), anything else will
  generate an error.

  In a normal TeX file, you don't do \dimen\maxdimen, but the
  lua syntax seems to be a bit cleaner to me. The intention is
  to evntually also allow \chardefs and macros that expand
  into a number (todo)


* The tex table has also been extended with a large list of internal
  parameters (partially read/write). It is possible to access
  about every primitive that you can use after \the *and* is a
  single token. So there is

       integer   = tex.tracingcommands (\the\tracingcommands)
       integer   = tex.prevgraf        (\the\prevgraf)
       string    = tex.output          (\the\output)

  etc. for all of the internal parameters, but not the items
  that need extra arguments (like \the\scriptfont )

  The subset comprising simple integer and dimension registers
  are writable as well as readable (stuff like \tracingcommands
  and \parindent).

  The fact that both lists are still quite limited is a result of
  the very different types of things that can occur after \the and
  also on the LHS of an assignment. The remaining primitives will
  be filled in when there is a real need or implementation becomes
  simple, whichever comes first.



==============================================================
Luatex snapshot-20060901 was released 20060901
==============================================================

All changes are related to lua this time, and most are quite unstable
/ experimental. But first the things that are stabel/fixed bugs:

* A VF loading bug that turned up in some of Hans' fonts
  has been fixed

* A small series of bounds checking fixes to \ocplist has been
  added to prevent the system from crashing due to array indexes
  running out of bounds.

* The Lua file searching paths are now fixed. The search path for lua
  script files now contains the following items (tried in order)
  1. the local directory:
       ./?.lua
    (for document-specific files)
  2. the items from the expansion of kpathsea's $TEXMFSCRIPTS variable,
    but only the parts containing 'lua' as a subpath:
       $TEXMFSCRIPTS<lua>/?.lua
       $TEXMFSCRIPTS<lua>/?/init.lua
     (for format-specific files)
  3. the $SELFAUTOPARENT sibling directory named 'lib'.
       $SELFAUTOPARENT/lib/lua/5.1/?.lua
       $SELFAUTOPARENT/lib/lua/5.1/?/init.lua
     (for files that are not related to tex)

  The search path for dynamic libraries has only
  1. the local directory:
       ./?.so
    (for document-specific files)
  2. and the $SELFAUTOPARENT sibling directory named 'lib'.
       $SELFAUTOPARENT/lib/lua/5.1/?.so

  (of course the extension is .dll on windows, but .dlls do not
   work at the moment so it will not do you much good)

* There are two functions available within a new table called
  texio:
    texio.write (luastring)
    texio.write_nl (luastring)
  both write the luastring to the same location(s) TeX writes
  its stuff. So if \batchmode is on, it writes only to the
  log, inside a \write, it prints to the current write file,
  etc.

  A read|write interface to TeX's "file selector" will
  follow shortly.

* At startup, luatex searches for a script named
    startup.lua
  in the path list I explained above. If such a file exists, it is
  loaded.

  This happens right before the first input file needs to be opened
  (that is after format loading, but before any \everyjob tokens).

  From within the script, you can check the value of

    tex.formatname

  that is the 'format identification' as used by TEX. When the variable
  is equal to nil, luatex in in 'initex' mode, otherwise it will be
  something like: " (format=plain 2006.9.1)"


Now for the experimental portion: callbacks. Here is what I have done
so far:

* The main reason for wanting startup.lua is file (input) re-encoding.
  For this purpose, it is now possible to set up a callback for
  luatex to execute.

  If you attach a Lua function to

    texio.input_line

  then from the next input line onwards, luatex will run that
  function whenever it needs a new input line from a text file.

  Your function will receive a file handle as argument, and
  should return either a string or nil (with nil signalling that
  the end of file has occurred).

  The trivial case is simply this:

    function reader (f)
        return f:read()
    end
    texio.input_line = reader


  Warning: The implementation is not totally finished yet. For the
  moment the file handle ("f" in the example) is a normal lua file,
  with a simple but important restriction: you cannot alter its value.
  You cannot f:close() it, or assign it a different value. luatex
  will eventually close the file itself.

  The restriction is a side-effect of a synchronisation problem with
  the lua garbage collector. Because of this, it also was necessary
  to turn off the automatic file closing code for normal lua io
  files (In other words: you have to close yourself all the files
  you opened yourself, and you should not close any files you did
  not open yourself).

  In the near future, "f" will become a special 'texio' file object
  and the needed functionality from the normal io library will be
  reimplemented. Along with that change, there will also be a callback
  to open (i.e. find) files, and a simple interface to the compiled-in
  kpathsea to use within that callback. 


==============================================================
Luatex snapshot-20060825 was released 20060825
==============================================================

The main change in this snapshot is that it uses far less memory.
luatex -ini on my linux machine went from 326Mb (last week) to
93Mb (now), and "texexec luatex" now ends at 184Mb instead of
over 1/2Gb.

This is achieved by two big changes:

* The \mathcode, \delcode, \catcode, \sfcode, \lccode and \uccode
   tables are now sparse arrays that are implemented in C. They
   are no longer part of the TeX "equivalence table" and because
   each had 1.1 million entries with a few memory words each, this
   makes a major difference.

   See mathcodes.c and textcodes.c if you are interested in the
   gory details, but be warned: the code is still extremely
   rough and ugly. In particular, the dump and undump routines
   are far from optimal, resulting in somewhat larger format files
   than before (approx 1.3Mb larger with unicode-letters loaded,
   10k without); and the assignments do not show up when using
   the etex tracing routines \tracingassigns and \tracingrestores
   (code simply not written yet)

* Single-character commands are no longer "special" internally,
   they are stored in the hash just like the multiletter csnames.


==============================================================
Luatex snapshot-20060818 was released 20060818
==============================================================

The snapshot is up to par with Aleph-RC4 (from texlive devel)
and the latest pdftex beta (even newer than 20060811). However,
there are some differences, to summarize:

* There is no pool file (all strings are embedded)

* -8bit and -translate-file are silently ignored

* There is no mltex nor enctex (conflicts with aleph)

* The tex functionality is always present and enabled
  (but see below about TeXXeT), so the asterisk or
  -etex switch for initex is not needed

* "plus 1 filllllllll" does not generate any errors from TeX

* TeXXeT (from eTeX) is not present, so the primives
    \TeXXeTstate
    \beginR
    \beginL
    \endR
    \endL
  are missing

* The experimental pdftex regex match operations are removed,
  because that feature does not make much sense when lua is
  available so the primitives
        \pdfmatch
    \pdflastmatch
  are missing

* The input translations from Aleph are not implemented, the
  16 related primitives are all missing
     \DefaultInputMode
     \noDefaultInputMode
     \noInputMode
     \InputMode
     \DefaultOutputMode
     \noDefaultOutputMode
     \noOutputMode
     \OutputMode
     \DefaultInputTranslation
     \noDefaultInputTranslation
     \noInputTranslation
     \InputTranslation
     \DefaultOutputTranslation
     \noDefaultOutputTranslation
     \noOutputTranslation
     \OutputTranslation
  All file IO assumes UTF-8, except that all the low-ascii
  controls except TAB, CR en LF are written to the terminal
  using ^^  notation (even these are binary in the log file).

* Input characters can use the full range of Unicode,
  but it probably only makes sense to use values above
  the base plane for \mathcode and \catcode assignments,
  since the fonts as well as the hyphenation patterns
  are strictly 16-bit still.

* The primitives
     \pdfpagewidth and \pagewidth,
     \pdfpageheight and \pageheight,
     \fontcharwd and \charwd,
     \fontcharht and \charht,
     \fontchardp and \chardp,
     \fontcharic and \charic,
  are all aliases of eachother.

* The new primitive
     \clearmarks<number>
  clears a marks class completely.

* The experimental pdftex primitives
     \pdfprimitive
     \ifpdfprimitive
     \ifpdfabsnum
     \ifpdfabsdim
  and provided without the extra 'pdf' prefix, so they are
  simply called
     \primitive
     \ifprimitive
     \ifabsnum
     \ifabsdim
  instead.

* I probably forgot to mention some things :-)