Start gen refactor

Signed-off-by: jolheiser <john.olheiser@gmail.com>

data/block/gen_block.go

@@ -130,7 +130,8 @@ func makeBlockDeclaration(blocks []Block) *ast.DeclStmt {
 	return out
 }
 
-//go:generate go run $GOFILE > ./packetid.go
+//go:generate go run $GOFILE
+//go:generate go fmt block.go
 func main() {
 	blocks, err := downloadInfo()
 	if err != nil {
@@ -138,7 +139,14 @@ func main() {
 		os.Exit(1)
 	}
 
-	fmt.Println(`// Code generated by gen_blocks.go; DO NOT EDIT.
+	f, err := os.Create("entity.go")
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+		os.Exit(1)
+	}
+	defer f.Close()
+
+	fmt.Fprintln(f, `// Code generated by gen_blocks.go; DO NOT EDIT.
 
 // Package block stores information about blocks in Minecraft.
 package block
@@ -176,26 +184,26 @@ type Block struct {
 `)
 	format.Node(os.Stdout, token.NewFileSet(), makeBlockDeclaration(blocks))
 
-	fmt.Println()
-	fmt.Println()
-	fmt.Println("// ByID is an index of minecraft blocks by their ID.")
-	fmt.Println("var ByID = map[ID]*Block{")
+	fmt.Fprintln()
+	fmt.Fprintln()
+	fmt.Fprintln(f, "// ByID is an index of minecraft blocks by their ID.")
+	fmt.Fprintln(f, "var ByID = map[ID]*Block{")
 	for _, b := range blocks {
-		fmt.Printf("  %d: &%s,\n", b.ID, strcase.ToCamel(b.Name))
+		fmt.Fprintf(f,"  %d: &%s,\n", b.ID, strcase.ToCamel(b.Name))
 	}
-	fmt.Println("}")
+	fmt.Fprintln(f, "}")
 
-	fmt.Println()
-	fmt.Println("// StateID maps all possible state IDs to a corresponding block ID.")
-	fmt.Println("var StateID = map[uint32]ID{")
+	fmt.Fprintln()
+	fmt.Fprintln(f, "// StateID maps all possible state IDs to a corresponding block ID.")
+	fmt.Fprintln(f, "var StateID = map[uint32]ID{")
 	for _, b := range blocks {
 		if b.MinStateID == b.MaxStateID {
-			fmt.Printf("  %d: %d,\n", b.MinStateID, b.ID)
+			fmt.Fprintf(f, "  %d: %d,\n", b.MinStateID, b.ID)
 		} else {
 			for i := b.MinStateID; i <= b.MaxStateID; i++ {
-				fmt.Printf("  %d: %d,\n", i, b.ID)
+				fmt.Fprintf(f, "  %d: %d,\n", i, b.ID)
 			}
 		}
 	}
-	fmt.Println("}")
+	fmt.Fprintln("}")
 }