ChangeLog

2018-02-21  John D. Ramsdell  <ramsdell@mitre.org>

	* datalog.spec.in: Added gcc to BuildRequires.

2016-06-24  John D. Ramsdell  <ramsdell@mitre.org>

	* configure.ac: Added missing AC_ARG_WITH([lua_suffix],...)

2016-06-01  John D. Ramsdell  <ramsdell@mitre.org>

	* git: Tagged as datalog-2.6 with tag v2.6.

2016-02-07  John D. Ramsdell  <ramsdell@mitre.org>

	* datalog.texi (Library): Added a description of dl_mark and
	dl_reset.

2016-01-14  John D. Ramsdell  <ramsdell@mitre.org>

	* datalog.h: Included stdio.h and lua.h so that datalog.h
	compiles.

	* configure.ac: Added luaconf.h to checked header list.

2015-04-28  John D. Ramsdell  <ramsdell@mitre.org>

	* datalog.spec.in: Updated changelog and changed build requires to
	lua > 5.1.

	* git: Tagged as datalog-2.5 with tag v2.5.

2015-04-27  John D. Ramsdell  <ramsdell@mitre.org>

	* lua/*: Updated Lua sources to version 5.3.0.

2013-03-23  John D. Ramsdell  <ramsdell@mitre.org>

	* config.guess, config.sub: Distribution rebuild to support the
	ARM 64 bit CPU architecture (aarch64).

	* git: Tagged as datalog-2.4 with tag v2.4.

2012-09-29  John D. Ramsdell  <ramsdell@mitre.org>

	* git: Tagged as datalog-2.3 with tag v2.3.

2012-04-28  John D. Ramsdell  <ramsdell@mitre.org>

	* loader.c (pushstring): Added a check for hexadecimal escape
	sequences in strings.  An error is signaled when one is found.

	* stackless.diff: Added a patch that prevents Lua stack exhaustion
	when evaluating deep queries.  It does so by moving Datalog search
	control information from the Lua stack into a table of thunks.
	This patch addresses an issue reported by Pierre Carbonnelle.

2012-04-26  John D. Ramsdell  <ramsdell@mitre.org>

	* git: Tagged as datalog-2.2 with tag v2.2.

2012-04-20  John D. Ramsdell  <ramsdell@mitre.org>

	* interp.c (getaline): Added a space to the prompt.  The space was
	inadvertently deleted when readline support was added.

2012-04-18  John D. Ramsdell  <ramsdell@mitre.org>

	* tc.dl: Added a test case based on the transitive closure.

2012-04-13  John D. Ramsdell  <ramsdell@mitre.org>

	* datalog.texi (Stand-Alone):  Added a chapter on using the
	datalog module in the stand-alone Lua interpreter.

	* datalog.texi (Library):  Added a section on making assertions via
	the C API.

	* even.lua: Added the code that makes up the Stand-Alone chapter.

2012-04-08  John D. Ramsdell  <ramsdell@mitre.org>

	* git: Tagged as datalog-2.1 with tag v2.1.

	* try.sh, Makefile.am: Changed the extension used for Datalog input
	from .prolog to .dl.

	* interp.c (getaline): Fixed end of line bugs when using
	readline for the case of a line continued with '\' and when
	reading a file with '='.

	* add.lua: Added checks to ensure arguments are numbers.

	* datalog.c (dl_pcall, dl_lua): Removed DATALOG_DEBUG, and now
	always print the error message returned from Lua.  This message is
	very useful now that its so easy to add primitives using the -l
	option.

2012-04-07  John D. Ramsdell  <ramsdell@mitre.org>

	* git: Tagged as datalog-2.0 with tag v2.0.

	* configure.ac:  Enabled the use of the one C99 feature used in
	the program.  When compiled with a C99 compiler, pushstring in
	loader.c uses a variable length array instead of a malloc.

	* interp.c (getaline): Added support for GNU readline in the
	interpreter when it is available.

2012-04-06  John D. Ramsdell  <ramsdell@mitre.org>

	* loader.c (addstr): Fixed two bugs associated with the end of a
	string.  Fixed the case in which the last character in a buffer is
	double quote and the previous character is part of a numerical
	escape.  Also fixed the case in which a pushed buffer was followed
	by a buffer read giving a double quote, but the state s1 was not
	SEEN_NOTHING.

2012-04-05  John D. Ramsdell  <ramsdell@mitre.org>

	* loader.c (pushstring, addstr): In order to better integrate with
	other Unix tools, numeric string escapes now consist of one, two,
	or three octal digits.  This change makes this version
	incompatible with previous versions.

	* interp.c (main): Added the -l option that loads a Lua script
	after the loading of datalog.lua.  The Lua script can be used to
	add primitives.

2012-04-04  John D. Ramsdell  <ramsdell@mitre.org>

	* NEWS: Converted the file to use outline format.

2012-04-03  John D. Ramsdell  <ramsdell@mitre.org>

	* datalog.texi (Import/Export): Added an example showing
	/etc/passwd as the source of a database table.

	* Makefile.am (dist_noinst_SCRIPTS): Added the datalogimport and
	datalogexport scripts.

2012-04-02  John D. Ramsdell  <ramsdell@mitre.org>

	* datalog.texi (Import/Export):  Added a new chapter describing
	how to import and export tab seperated values.

2012-04-01  John D. Ramsdell  <ramsdell@mitre.org>

	* interp.c (print_answers_as_tab_separated_values): Added the -t
	option that prints answers using tab separated values.

	* datalog.texi (Extending): Added a reference to the addition
	primitive comment in datalog.lua.in.

	* datalog.lua.in (add_iter_prim): Added a comment that shows how
	to add addition as a primitive.

	* datalog.lua.in (mk_intern): Coerced identifiers to be interned
	into a string instead of relying on callers to always provide a
	string.

2012-02-25  John D. Ramsdell  <ramsdell@mitre.org>

	* lua/*: Updated Lua sources to version 5.1.5.

2012-01-19  John D. Ramsdell  <ramsdell@mitre.org>

	* git: Tagged as datalog-1_8 with tag v1.8.

	* datalog.c (dl_open): Fix standard library loading for Lua 5.2.

	* datalog.c (dl_ask): Replace use of lua_strlen and lua_tostring
	with lua_tolstring.

	* datalog.lua.in: Replaced table.getn with #.

	* interp.c (interp, print_version): Remove compiler warnings about
	testing against a constant address.

	* bin2c.c (print_version): Remove compiler warnings about testing
	against a constant address.

	* configure.ac: Corrected the NO_LUA test.  Added check for
	lauxlib.h.  Changed lua function used in lua library check from
	lua_pcall to lua_pushboolean, as lua_pcall is a macro in Lua 5.2.

2012-01-18  John D. Ramsdell  <ramsdell@mitre.org>

	* datalog.lua.in, COPYING.LIB: Fixed the address of the Free
	Software Foundation.

	* datalog.1: Added a manual page.

2011-09-30  John D. Ramsdell  <ramsdell@mitre.org>

	* git: Tagged as datalog-1_7 with tag v1.7.

2011-09-29  John D. Ramsdell  <ramsdell@mitre.org>

	* Makefile.am (lib_LTLIBRARIES): Added support for shared
	libraries via libtool.  The default is static libraries.

2011-09-27  John D. Ramsdell  <ramsdell@mitre.org>

	* configure.ac, Makefile.am, datalog.spec.in: Added --with-lua
	option and when specified, use the installed lua package.

	* acinclude.m4: Changed to be GNU's ax_lua.m4.

2011-09-22  John D. Ramsdell  <ramsdell@mitre.org>

	* datalog.spec.in (BuildRequires): Added build dependency on
	texinfo.

2011-09-20  John D. Ramsdell  <ramsdell@mitre.org>

	* datalog.spec.in (Release): Removed devel packages and bumped
	release number to 2.

2011-07-05  John D. Ramsdell  <ramsdell@mitre.org>

	* CVS: Tagged as datalog-1_6.

	* lua/*: Applied patch http://www.lua.org/ftp/patch-lua-5.1.4-3.

	* datalog.spec.in:  Added changelog and SMP make flags.

2011-07-01  John D. Ramsdell  <ramsdell@mitre.org>

	* loader.c (addstr): Corrected the computation of the mark for a
	quoted constant that spans multiple buffers.  When reading a
	quoted string that spans multiple buffers, bytes were lost.  This
	fixes a reader bug reported by Georges Louis.

2010-05-27  John D. Ramsdell  <ramsdell@mitre.org>

	* CVS: Tagged as datalog-1_5.

	* interp.c (getaline): Rename function from getline to avoid
	conflict with the one in <stdio.h>.

2009-03-30  John D. Ramsdell  <ramsdell@mitre.org>

	* CVS: Tagged as datalog-1_4.

	* datalog.c (dl_ask): Added forgotten pop of the answer array so
	as to fix a space leak reported by Faisal Alquaddoomi.

	* Updated Lua sources to version 5.1.4.

2007-07-18  John D. Ramsdell  <ramsdell@mitre.org>

	* CVS: Tagged as datalog-1_3.

	* interp.c (main): Add dl_close so as to allow valgrind leak
	check.

2007-04-14  John D. Ramsdell  <ramsdell@mitre.org>

	* Updated Lua sources to version 5.1.2.

	* configure.ac: Changed version number to 1.3

2006-09-29  John D. Ramsdell  <ramsdell@mitre.org>

	* CVS: Tagged as datalog-1_2.

	* Added the Lua sources into the distribution so that this program
	no longer depends on the right Lua distribution being installed.

	* datalog.spec.in: The library and the header are made available
	only in a separate development package.  The development package
	still depends on the right Lua distribution being installed.

2006-08-24  John D. Ramsdell  <ramsdell@mitre.org>

	* bin2c.c, datalog.c, interp.c, loader.c: Replace zeros with NULLs
	when used as null pointer constants.

2006-07-27  John D. Ramsdell  <ramsdell@mitre.org>

	* CVS: Tagged as datalog-1_1.

2006-07-19  John D. Ramsdell  <ramsdell@mitre.org>

	* datalog.c (dl_open): Libraries are now opened using lua_call as
	is done in luaL_openlibs.

2006-05-24  John D. Ramsdell  <ramsdell@mitre.org>

	* CVS: Tagged as datalog-1_0.

2006-05-18  John D. Ramsdell  <ramsdell@mitre.org>

	* datalog.c: Modified so as to make use of the Lua 5.1 C API.

	* datalog.h: Changed the definition of dl_db_t to expose the Lua
	state.  Users of this header file must include lua.h.

2006-03-04  John D. Ramsdell  <ramsdell@mitre.org>

	* CVS: Tagged as datalog-0_7.

	* datalog.lua.in: Converted usages of the n field in an array to
	calls to table.getn(...).

2006-02-27  John D. Ramsdell  <ramsdell@mitre.org>

	* bin2c.c: Made binary data to C source file converter non-Lua
	specific.

2005-12-12  John D. Ramsdell  <ramsdell@mitre.org>

	* CVS: Tagged as datalog-0_6.

	* datalog.lua.in: Made the copying of the database include copying
	each predicate so that a predicate's clauses are not shared.

2005-12-07  John D. Ramsdell  <ramsdell@mitre.org>

	* CVS: Tagged as datalog-0_5.

2005-11-16  John D. Ramsdell  <ramsdell@mitre.org>

	* datalog.lua.in: Added copy and revert, another way to save and
	restore databases.  With copy and revert, one can use one copy of
	a database multiple times to revert to a previous database.

2005-11-09  John D. Ramsdell  <ramsdell@mitre.org>

	* datalog.c (dl_version): Provided version information via a
	library function.

2005-08-10  John D. Ramsdell  <ramsdell@mitre.org>

	* datalog.lua.in: Added the ability to save and restore
	databases.

2005-05-23  John D. Ramsdell  <ramsdell@mitre.org>

	* CVS: Tagged as datalog-0_4.

	* Changed notation to use literal to describe an atomic formula
	and other name changes so as to follow the conventions in "What
	You Always Wanted to Know About Datalog (And Never Dared to Ask)",
	Stefano Ceri, Georg Gottlob, and Letizia Tanca, IEEE Transactions
	of Knowledge and Data Engineering, Vol. 1, No. 1, March 1989.

2005-01-21  John D. Ramsdell  <ramsdell@mitre.org>

	* CVS: Tagged as datalog-0_3.

	* datalog.lua (rename_clause): Changed so that all variables in a
	clause are renamed rather than just the ones in the clause's goal.
	The previous implementation allowed inferences to fail when they
	should have succeeded.

2004-12-27  John D. Ramsdell  <ramsdell@mitre.org>

	* CVS: Tagged as datalog-0_2.

	* datalog.lua.in (insert, remove, assert, retract): Return value
	changed.  Each returns their argument, except that assert returns
	nil when given an unsafe clause.

	* acinclude.m4: Added a lua library version checking macro.

2004-12-23  John D. Ramsdell  <ramsdell@mitre.org>

	* datalog.lua.in: Optimized for performance.  Removed needless
	dispatches through metatables and converted calls to tail calls
	whenever possible.

	* try.sh: Added a simple testing framework.

2004-12-22  John D. Ramsdell  <ramsdell@mitre.org>

	* datalog.lua.in (datalog): Lua functions are exported in the
	datalog package.

	* datalog.texi (Introduction): Added references to journals with
	articles describing tabled logic programming.

2004-12-21  John D. Ramsdell  <ramsdell@mitre.org>

	* CVS: Tagged as datalog-0_1.

	* datalog.h (dl_db_t): Changed the name of the type of a Datalog
	database to dl_db_t.  Functions exported by the library are
	prefixed with DATALOG_API.

	* datalog.c (dl_init): Added an init function so that an existing
	Lua structure can be used with the deductive database.

	* datalog.texi: The LGPL is the license for the manual.  Updated
	the manual to document the dl_db_t and dl_init changes.

2004-12-20  John D. Ramsdell  <ramsdell@mitre.org>

	* CVS: Tagged as datalog-0_0.