Add StructureManager and NBT template loader for large structures

cmd/genblocks/main.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+)
+
+func main() {
+	f, err := os.Open("generated/reports/blocks.json")
+	if err != nil {
+		panic(err)
+	}
+	var data map[string]struct {
+		States []struct {
+			ID      int  `json:"id"`
+			Default bool `json:"default"`
+		} `json:"states"`
+	}
+	if err := json.NewDecoder(f).Decode(&data); err != nil {
+		panic(err)
+	}
+
+	out, _ := os.Create("internal/worldgen/generated_blocks.go")
+	fmt.Fprintln(out, "package worldgen")
+	fmt.Fprintln(out, "")
+	fmt.Fprintln(out, "// defaultBlockIDs maps block names to their default state ID.")
+	fmt.Fprintln(out, "var defaultBlockIDs = map[string]uint16{")
+
+	for name, block := range data {
+		for _, state := range block.States {
+			if state.Default {
+				fmt.Fprintf(out, "\t%q: %d,\n", name, state.ID)
+			}
+		}
+	}
+	fmt.Fprintln(out, "}")
+	out.Close()
+}