 * ----------------------------------------------------------------------
 *	Copyright (c) 2015 Scott Furry
 *
 *	This file is part of Freedroid
 *
 *	Freedroid is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 *	Freedroid is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with Freedroid; see the file COPYING. If not, write to the
 *	Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *	MA  02111-1307  USA
 *
 * ----------------------------------------------------------------------
Freedroid RPG Dialog Node Mapping README

See Freedroid Doxygen page (tools->FDDNM) for more details.

------------
Definitions:
------------
dialog file - FDRPG source file written in lua that is used to guide
			player conversations and interactions in game. These files are
			usually located within [FDRPG root]/data/storyline/act1/dialogs folder.

return block - a section of the dialog file delimited by "return {...}"

dialog node - are sections of lua code within a return block of a dialog file.
			Each dialog node is delimited by "EveryTime =...end,",
			"FirstTime = ...end," or an anonymous array entries delimited by
			"{...},"

------------
Description:
------------
#-----
Note to Freedroid RPG developers/maintainers
changes to dialog structure or variables will require that
source for this tool be reviewed and if necessary updated.
#-----

classes
fddnm:			parses cmd line params
				governs dialogs to be parsed
				maintains dialog_file and dialog_dot listing for each file
				converts resultant dot data to user requested graphic format

dialog_file:	parses dialog file as a whole
				maintains dialog node listing

dialog_node:	parses dialog file node details

dialog_dot:		converts dialog data from dialog[_file|_dot] into dot language

-------------
Requirements:
-------------
- c++ compliant compiler (gcc series 4.9.x or later) with regex capability.
- boost filesystem, algorithms and program_options (boost >= 1.5.5)
- graphviz version >= 2.30.1 ( at or after git commit dated 07Mar2013
   id:a97e1306c43b2ead2f45c6bb93a9fc62f98fad1a)

---------
Building:
---------
For *BSD and MacOS X users, you must use "gmake" to build the FDDNM tool.
Any reference below to "make" should be replaced with "gmake" command.
The gmake tool is available for your platform from ports\packages repository.

Execute the sequence below to configure and build the FDDNM tool.\n

	cd [FDRPG root]/tools/fddnm
	./autogen_fddnm.sh
	./configure
	make

The tool is not meant to be installed on the users system, but remain resident
in the FDRPG root directory.

A gitignore file has been established that will exclude the tool, object files
and any program output (dot, png, svg, et al) from being accidentally included
into the FDRPG git tree.


-------------
Command Line:
-------------
Usage:
	fddnm	[-h|--help] Show help message for fddnm

	fddnm	[-q]  [-P | --verboseprint]
			[-D | --verbosedot] [-G | --group]
			[-H | --extrainfo] [-I | --individual]
			[[-s | --dirsearch=]arg] [[-o | --diroutput=]arg]
			[[-F | --fileprefix=]arg] [[-L | --layout=]arg]
			[[-T | --format=]arg] [[-d | --dialog=]arg]

	[-q]
	Quiet - no output to stdout

	[-P | \-\-verboseprint]
	Print parsed dialog data to text file. Text file placed in output directory.
	Note - output file will be named "[PREFIX][Dialog Name]_VPARSE.txt"

	[-D | \-\-verbosedot]
	Print analyzed dialog data used to create graphic to text file. Text file placed in output directory.
	Note - output file will be named "[PREFIX][Dialog Name]_VDOT.txt"

	[-G | --grouping]
	Grouping is used as a layout hint to graphviz.
	Enables nodes connected to "end_dialog" to be grouped closer to "end_dialog" node.
	(E.g. Dixon or Tania graphs produce better output with this setting enabled).\n

	[-H | --extrainfo]
	enable HTML-like dot output - includeds presentation of extra node information.
	See wiki pages for example for this kind of output.

	[-I | \-\-individual]
	Program is to parse and process all dialog files individually.
	Any references to \"include\" another dialog file will not be processed. (e.g. 614-cryo.lua)

	[-s | \-\-dirsearch=] *arg*
	Directory *arg* will be searched for dialog files (DEFAULT: [FDRPG root]/data/storyline/act1/dialogs)

	[-o | \-\-diroutput=] *arg*
	Directory *arg* will be used to store program output (graphic or text) (DEFAULT: current directory)

	[-F | \-\-fileprefix=] *arg*
	*arg* will be the validated text used as a prefix for output file names.
	Note - see the second entry "portable_name" in the [Boost Filesystem Portability Guide](http://www.boost.org/doc/libs/1_55_0/libs/filesystem/doc/portability_guide.htm#recommendations) for limitations

	[-L | \-\-layout=] *arg*
	*arg* is the direction of graph layout. One of [ TB (DEFAULT) | LR | RL | BT ]
	Note: see [Graphviz rankdir attribute](http://www.graphviz.org/content/attrs#drankdir) for details

	[-T | \-\-format=] *arg*
	*arg* is the graphic format of output. One of [ none | dot | jpg | png | svg (DEFAULT) ]

	[ | -d | \-\-dialog=] *arg*
	*arg* is the file name of dialog to be parsed without its *lua* file extension.
	No supplied dialog names implies all dialogs in search directory are to be parsed.
	More than one dialog name can be used without the switch as the use of the switch is optional.


---------
Examples:
---------
Usage Examples:
(all examples assume current directory is [FDRPG root]/tools/fddnm)

Convert all found dialogs to png graphics\n

	./fddnm -Tpng


Parse dialog file *Tania.lua* and convert to DOT Language file\n

	./fddnm -Tdot Tania

Output file *Tania.dot* would be produced and stored in the output directory.

Convert Doc Moore dialog to svg using Left to Right layout.
Output to user's home directory and set prefix to "TESTING_".

	./fddnm -Tsvg -FTESTING_ -o/home/user -LLR DocMoore


A special condition can exist were no graphic output is produced but
the text-only parse data can be made available for examination.\n

	./fddnm -Tnone -P -D

would produce text file dumps of all parsed and analyzed data stored in the default output directory.

--------------------
Ouput Interpretaton:
--------------------
Current implementation uses the following colour scheme:
	blue		parent node calls "show" command on child node
	green		parent node calls "next" command on child node
	orange		parent node calls "show_if" command on child node
	red(dashed)	parent node calls "hide" command on child node
	purple		parent node is calling end_dialog

Dialog nodes that are apart of a dialog topic are grouped inside a black line box.

Black lines are drawn from the dialog start to any "FirstTime" and "EveryTime" dialog nodes.

During parsing or review of verbose output, the user may notice the following:

	Tania	Detected 48 nodes	Parsed 49 nodes

This output indicates that the dialog contains within code a call to *end_dialog*.
To allow lines (or edges) to be drawn from the calling node to "end_dialog", an
"artificial" end node is appended to the dialog node data. As a result of the
addition of an end_dialog node, the Parsed node count will be set to
(Detected Node Count + 1).

-------------
Known Issues:
-------------
Current implementation has issues with some node parsing that involve programmatically
determining the node value to be used. The dialogs involved include Engel
(bot parts topic) and Ewald (gamble topic). This problem will be corrected in a
future release.

There are known issues when running address sanitizer or valgrind against the fddnm sources.
These issues stem from code within graphviz and do not appear to be related to fddnm. This is
an ongoing issue that is being monitored.

----------------------
- Troubleshoot Build -
----------------------
If you receive an error during config that the boost libraries could not be found,
do the following:
	Verify boost is installed on your system by locating libboost_system.so and
	boost/system header.

	If not found, install boost to your system (check distribution) and re-attempt
	configure.

	If boost is present on the system and error is persistent, manually add these
	paths to the configure conmmand	as follows:
	./configure CPPFLAGS="-I/folder/path_boost_folder" \
				LDFLAGS="-L/folder/path_libboost_system"

If you receive an error during configure that the graphviz libraries could not
be found, attempt the following:
	Verify graphviz is installed by typing 'dot -V'
	( should report "dot - graphviz version 2.x.y")

	If this step fails - install the graphviz library and retry configure

	If graphviz and pkg-config are installed, use the following:
	- locate libgvc.pc file
	(or similar pkg-config for graphviz - check distribution)
	- add the path of the graphviz libraries to LDFLAGS variable.
	(note quotation/backtick marks below)

	./configure CPPFLAGS="`pkg-config libgvc --cflags`" \
				LDFLAGS="`pkg-config libgvc --libs-only-L`"

	If graphviz is installed but pkg-config is not present on your platform,
	manually locate gvc.h and libgvc.so and use the following:

	./configure CPPFLAGS="-I/folder/path_gvc_h" LDFLAGS="-L/folder/path_gvc_so/"


During compile you receive the error...

	fddnm.cpp: In member function ‘void fddnm::graphivOutput(const string&, const string&)’:
	fddnm.cpp:653:38: error: invalid conversion from ‘const char*’ to ‘char*’ [-fpermissive]
	   Agraph_t* G = agmemread(userDotData);
										  ^
	In file included from /usr/include/graphviz/types.h:717:0,
					 from /usr/include/graphviz/gvc.h:20,
					 from fddnm.cpp:39:
	/usr/include/graphviz/graph.h:165:22: note: initializing argument 1 of ‘Agraph_t* agmemread(char*)’
		 extern Agraph_t *agmemread(char *);
						  ^

This indicates that the graphviz library requirement has not been met. See requirements above and follow
the instructions for your distribution to update graphviz.


If during linking (MacOS X) you receive the error:

	Undefined symbols for architecture x86_64:
	boost::...

there is a difference in compiler used to build boost library and FDDNM.
( http://stackoverflow.com/a/20015083 )
This can be verified by executing the following command:

	otool -L /opt/local/lib/libboost_system-mt.dylib

The command should report back libboost_system library linkage to either libc++ (clang)
or libstdc++ (gcc). The solution is to either use the same compiler for FDDNM or
rebuild boost libraries with prefered compiler. To compiler FDDNM and match compiler
used to build boost library, use the following during configure:

	./configure ... CXX="[ g++ | clang++ ]"


Should these steps not work for you, please contact freedroidRPG on IRC for help.
---------------------------------------------------
