use cosmos's format regexp for denom

gnovm/stdlibs/std/banker.gno

@@ -1,6 +1,8 @@
 package std
 
 import (
+	"crypto/sha256"
+	"encoding/hex"
 	istd "internal/std"
 )
 
@@ -67,12 +69,18 @@ func (ba bankAdapter) TotalCoin(denom string) int64 {
 
 func (ba bankAdapter) IssueCoin(addr Address, denom string, amount int64) {
 	// XXX apply PrevRealm.PkgPath,  https://github.com/gnolang/gno/pull/667
-	// denom shoulde `pkg_path@denom`
+
+	// Similar to ibc ==> "ibc/" + sha256('path' + 'base_denom')
+	// "realm/" + sha256('pkg_path' + 'base_denom')
 
 	// from := std.PrevRealm().PkgPath
 	from := istd.GetOrigCaller().String()
+	to_hash := from + "/" + denom
+
+	hash := sha256.Sum256([]byte(to_hash))[:]
+	hex_hash := hex.EncodeToString(hash)
 
-	denom = from + "@" + denom
+	denom = "realm/" + hex_hash
 	ba.nativeBanker.IssueCoin(addr, denom, amount)
 }
 

gnovm/stdlibs/std/banker_test.gno

@@ -0,0 +1,47 @@
+package std
+
+import (
+	"std"
+	"testing"
+
+	"gno.land/p/demo/avl"
+	"gno.land/p/demo/testutils"
+)
+
+var (
+	denoms avl.Tree // id -> *minter
+)
+
+func Mint(addr std.Address, denom string, amount int64) {
+	caller := std.GetOrigCaller()
+	if denoms.Has(denom) {
+		data, _ := denoms.Get(denom)
+		minter := data.(std.Address)
+		if minter != caller {
+			panic("not minter")
+		}
+	} else {
+		denoms.Set(denom, caller)
+	}
+
+	issuer := std.GetBanker(std.BankerTypeRealmIssue)
+	issuer.IssueCoin(addr, denom, amount)
+}
+
+func TestMint(t *testing.T) {
+	who := testutils.TestAddress("who")
+	issuer := std.GetBanker(std.BankerTypeRealmIssue)
+
+	shouldEQ(t, len(issuer.GetCoins(who)), 0)
+
+	issuer.IssueCoin(who, "ugnot", 123)
+	shouldEQ(t, len(issuer.GetCoins(who)), 1)
+	shouldEQ(t, issuer.GetCoins(who)[0].Amount, 123)
+	shouldEQ(t, issuer.GetCoins(who)[0].Denom, "realm/dde02d16adbf1a4ff70e273c871d6de322b30075a0a8a0e7b6cd5a27f5189922")
+}
+
+func shouldEQ(t *testing.T, got, wanted interface{}) {
+	if got != wanted {
+		t.Errorf("got %v(%T), wanted %v(%T)", got, got, wanted, wanted)
+	}
+}

tm2/pkg/std/coin.go

@@ -617,7 +617,8 @@ func (coins Coins) Sort() Coins {
 
 var (
 	// Denominations can be 3 ~ 16 characters long.
-	reDnmString = `[a-z][a-z0-9]{2,15}`
+	// reDnmString = `[a-z][a-z0-9]{2,15}` // Gno
+	reDnmString = `[a-zA-Z][a-zA-Z0-9@/:._-]{2,127}` // Cosmos with '@'
 	reAmt       = `[[:digit:]]+`
 	reDecAmt    = `[[:digit:]]*\.[[:digit:]]+`
 	reSpc       = `[[:space:]]*`