Add scrap hash to print its sha256 hash

Author: Victorystick

cmd/scrap/main.go

@@ -21,6 +21,7 @@ var commands = []Command{
 	{name: "eval", desc: "evaluates it", fn: evaluate},
 	{name: "type", desc: "infers its type", fn: inferType},
 	{name: "push", desc: "pushes it to the server", fn: pushScrap},
+	{name: "hash", desc: "prints its sha256 hash", fn: hashScrap},
 }
 
 var (
@@ -102,3 +103,10 @@ func pushScrap(args []string) {
 	key := must(env.Push(scrap))
 	fmt.Println(key)
 }
+
+func hashScrap(args []string) {
+	input := must(io.ReadAll(os.Stdin))
+	env := makeEnv()
+	scrap := must(env.Read(input))
+	fmt.Println(scrap.Sha256())
+}

eval/env.go

@@ -17,6 +17,10 @@ type Scrap struct {
 	value Value
 }
 
+func (s Scrap) Sha256() string {
+	return fmt.Sprintf("%x", sha256.Sum256(s.expr.Source.Bytes()))
+}
+
 type Sha256Hash = [32]byte
 
 type Environment struct {