From 41d04a5facc85e8040cd472bb530df2821cb1df2 Mon Sep 17 00:00:00 2001
From: Manfred Touron <94029+moul@users.noreply.github.com>
Date: Tue, 13 Sep 2022 13:31:09 +0000
Subject: [PATCH] chore: add std.ExecAsPkg

Signed-off-by: Manfred Touron <94029+moul@users.noreply.github.com>
---
 stdlibs/stdlibs.go          | 28 ++++++++++++++++++++++++++++
 stdlibs/stdshim/stdshim.gno |  4 ++++
 2 files changed, 32 insertions(+)

diff --git a/stdlibs/stdlibs.go b/stdlibs/stdlibs.go
index b365e43a14e..4660d6d4398 100644
--- a/stdlibs/stdlibs.go
+++ b/stdlibs/stdlibs.go
@@ -275,6 +275,34 @@ func InjectPackage(store gno.Store, pn *gno.PackageNode) {
 				m.PushValue(res0)
 			},
 		)
+		pn.DefineNative("ExecAsPkg",
+			// TODO: rename UnsafeExecAsPkg?
+			gno.Flds( // params
+				"fn", gno.FuncT(nil, nil),
+			),
+			gno.Flds( // results
+			),
+			func(m *gno.Machine) {
+				// TODO: limit stack size: 1? 32?.
+				// TODO: limit usage in goroutines?
+				// TODO: build a new sub-context instead of patching the root one.
+				//       to support multiple concurrent contexts and advanced flows.
+				arg0 := m.LastBlock().GetParams1().TV
+				fn := arg0.GetFunc()
+				println("#####################", arg0, fn.GetType(m.Store).String())
+				//gno.Call(fn, "nil")
+				//m.Eval(gno.Call(fn))
+				// m.Eval(gno.Call(gno.FuncT(nil, nil), fn))
+				println("@@@@@@@@@@")
+				//println(fn)
+
+				/*
+					ctx := m.Context.(stdlibs.ExecContext)
+					ctx.OrigCaller = crypto.Bech32Address(addr)
+					m.Context = ctx
+				*/
+			},
+		)
 		pn.DefineNative("GetCallerAt",
 			gno.Flds( // params
 				"n", "int",
diff --git a/stdlibs/stdshim/stdshim.gno b/stdlibs/stdshim/stdshim.gno
index 3cea10d572d..76544673ed3 100644
--- a/stdlibs/stdshim/stdshim.gno
+++ b/stdlibs/stdshim/stdshim.gno
@@ -78,3 +78,7 @@ func DecodeBech32(addr Address) (prefix string, bytes [20]byte, ok bool) {
 func DerivePkgAddr(pkgPath string) (addr Address) {
 	panic(shimWarn)
 }
+
+func ExecAsPkg(fn func()) {
+	panic(shimWarn)
+}