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simplify color api

--- a/a.h

+++ b/a.h

@@ -16,7 +16,6 @@

 void	registerapi(lua_State*);

 Image*	color(int, int, int);

-Image*	grayscale(int);

 extern int		drawing;

 extern Image	*canvas;

--- a/api.c

+++ b/api.c

@@ -63,17 +63,18 @@

 	c = lua_gettop(L);

 	if(c == 1){

-		g = luaL_checkinteger(L, 1);

-		i = grayscale(g);

+		r = luaL_checkinteger(L, 1);

+		g = r;

+		b = r;

 	}else if(c == 3){

 		r = luaL_checkinteger(L, 1);

 		g = luaL_checkinteger(L, 2);

 		b = luaL_checkinteger(L, 3);

-		i = color(r, g, b);

 	}else{

 		fprint(2, "invalid color request\n");

 		return nil;

 	}

+	i = color(r, g, b);

 	return i;

 }

--- a/color.c

+++ b/color.c

@@ -48,9 +48,3 @@

 	return c;

 }

-Image*

-grayscale(int n)

-{

-	return color(n, n, n);

-}

-