[Add] Random number generator to lua/ai.

scripts/ai/API

@@ -88,3 +88,14 @@ createvect(number x, number y)
     -- y coord of the vector.
     -- return pointer to the Vec2
 
+say(string message)
+  -- Make the pilot say something to the player.
+    -- message - string to output.
+    -- return nil
+
+rng(number low, number high)
+  -- Return a random number between low and high.
+    -- low - minimum to return.
+    -- high - maximum to return
+    -- return random number between low and high.
+

src/ai.c

@@ -11,6 +11,7 @@
 #include "player.h"
 #include "physics.h"
 #include "pack.h"
+#include "rng.h"
 #include "ai.h"
 
 // == AI ======================================================
@@ -77,11 +78,12 @@ static int ai_accel(lua_State* L);        // accel(number); nuimber <= 1.
 static int ai_turn(lua_State* L);         // turn(number); abs(number) <= 1.
 static int ai_face(lua_State* L);         // face(number/pointer)
 static int ai_brake(lua_State* L);        // Brake()
+// Combat.
+static int ai_shoot(lua_State* L);        // shoot(number) number = 1,2,3.
 // Misc.
 static int ai_createvect(lua_State* L);   // createvect(number, number)
 static int ai_say(lua_State* L);          // say(string)
-// Combat.
-static int ai_shoot(lua_State* L);        // shoot(number) number = 1,2,3.
+static int ai_rng(lua_State* L);          // rng(number, number)
 
 // Global Lua interpreter.
 static lua_State* L = NULL;
@@ -133,6 +135,7 @@ int ai_init(void) {
   // Misc.
   lua_register(L, "createvect",   ai_createvect);
   lua_register(L, "say",          ai_say);
+  lua_register(L, "rng",          ai_rng);
 
   char* buf = pack_readfile(DATA, "../scripts/ai/test.lua", NULL);
 
@@ -366,6 +369,7 @@ static int ai_createvect(lua_State* L) {
   return 1;
 }
 
+// Have the pilot say something to player.
 static int ai_say(lua_State* L) {
   MIN_ARGS(1);
 
@@ -375,6 +379,19 @@ static int ai_say(lua_State* L) {
   return 0;
 }
 
+// Return a number between low and high.
+static int ai_rng(lua_State* L) {
+  MIN_ARGS(2);
+
+  int l, h;
+
+  if(lua_isnumber(L,1)) l = (int)lua_tonumber(L, 1);
+  if(lua_isnumber(L,1)) h = (int)lua_tonumber(L, 2);
+
+  lua_pushnumber(L, RNG(l,h));
+  return 1;
+}
+
 // Pew pew.. Says the pilot.
 static int ai_shoot(lua_State* L) {
   int n = 1;