Output JSON reports - part 1 (#150)

Because these changes are going to be somewhat far-reaching, I am going
to do these in smaller chunks.   This chunk will contain

- a new game config which defaults to not outputting json reports.
- the inclusion of the nlohmann/json.hpp single-file json
  parser/manipulation library.
- Output the basic faction info (meaning the fields on the faction
  itself, but NOT deeper structures like regions/objects/units)
- An example of some small nested structures (skill shows/faction stats)
  to give examples of how this stuff will work.
- A renaming of 2 rules helper functions from link/link_ref to url/achor
  in order to avoid a conflict with the link() function from unistd.h
  which gets pulled in via the nlohmann/json.hpp standard library
  includes, and which caused the rules to break.  This is JUST a
  renaming and no functionality change, so you can ignore all the
  changes in genrules.cpp as part of this.
- Removing some duplicated skill data which was being output if you were
  shown a skill description which allowed you create an object which in
  turn allowed you to use a skill (create staff of healing shows the
  staff of healing, which then adds a skill show for magic healing).
  This wouldn't affect a player since a faction tracks whether or not a
  skill has been shown permanently and never shows it again, but when
  generating the turn 1 report for the gamemaster, if those items were
  enabled, 4 skills would end up shown twice.   This also accounts for
  the change to the snapshot turn_0 report.1 file.  Those changes are
  expected.

GAMEMASTER.md

@@ -672,7 +672,7 @@ If you wanted to switch on quartermasters, and have their level affect
 shipping costs, but not distance, you would set the variable in rules.cpp 
 like so:
 
-	Gamedefs::ALLOW_TRANSPORT | GameDefs::QM_AFFECT_COST, // TRANSPORT
+	GameDefs::ALLOW_TRANSPORT | GameDefs::QM_AFFECT_COST, // TRANSPORT
 
 Note that the different values are set using a boolean OR |, not a 
 logical OR ||.

Makefile

@@ -23,7 +23,7 @@ ENGINE_OBJECTS = alist.o aregion.o army.o astring.o battle.o economy.o \
   events.o events-battle.o events-assassination.o mapgen.o simplex.o namegen.o \
   indenter.o
 
-UNITTEST_SRC = unittest/main.cpp $(wildcard unittest/*_test.cpp)
+UNITTEST_SRC = unittest/main.cpp unittest/testhelper.cpp $(wildcard unittest/*_test.cpp)
 UNITTEST_OBJECTS = $(patsubst unittest/%.cpp,unittest/obj/%.o,$(UNITTEST_SRC))
 
 OBJECTS =  $(patsubst %.o,obj/%.o,$(ENGINE_OBJECTS)) $(patsubst %.o,$(GAME)/obj/%.o,$(RULESET_OBJECTS))

aregion.cpp

@@ -1319,6 +1319,14 @@ void ARegion::WriteExits(ostream& f, ARegionList *pRegs, int *exits_seen)
 	f << '\n';
 }
 
+void ARegion::write_json_report(json& j, Faction *fac, int month, ARegionList *pRegions) {
+	// for now, just set a name which would be the name of the region from a text report.
+	// ie "Alioth Plains (1, 2) in Alioth contains Alioth City [City]."
+	// This will get broken down and become more json-y when I flesh this code out.
+	j["name"] = Print(pRegions).const_str();
+	return;
+}
+
 void ARegion::WriteReport(ostream &f, Faction *fac, int month, ARegionList *pRegions)
 {
 	Farsight *farsight = GetFarsight(&farsees, fac);

aregion.h

@@ -45,6 +45,9 @@ class ARegionArray;
 #include "graphs.h"
 #include "mapgen.h"
 
+#include "external/nlohmann/json.hpp"
+using json = nlohmann::json;
+
 #include <map>
 #include <vector>
 #include <functional>
@@ -199,6 +202,7 @@ class ARegion : public AListElem
 		void WriteEconomy(ostream& f, Faction *, int);
 		void WriteExits(ostream& f, ARegionList *pRegs, int *exits_seen);
 		void WriteReport(ostream& f, Faction *fac, int month, ARegionList *pRegions);
+		void write_json_report(json& j, Faction *fac, int month, ARegionList *pRegions);
 		// DK
 		void WriteTemplate(ostream&  f, Faction *, ARegionList *, int);
 		void WriteTemplateHeader(ostream& f, Faction *, ARegionList *, int);

basic/rules.cpp

@@ -251,6 +251,7 @@ static GameDefs g = {
 	200,	// MIN_DESTROY_POINTS,
 	33,	// MAX_DESTROY_PERCENT
 	0, // HALF_RIDING_BONUS
+	GameDefs::REPORT_FORMAT_TEXT,	// REPORT_FORMAT
 };
 
 GameDefs *Globals = &g;