provide Recover() (ex LogCatch) function, use in core.Step()

core/core.go

@@ -1,6 +1,8 @@
 package core
 
 import (
+	"fmt"
+
 	lib "git.sr.ht/~cco/go-scopes"
 	"git.sr.ht/~cco/go-scopes/config"
 	"git.sr.ht/~cco/go-scopes/core/action"
@@ -22,7 +24,7 @@ func Listen(ctx lib.Context) {
 
 func Step(ctx lib.Context) (loop bool) {
 	loop = true
-	//defer ctx.LogCatch("Step")
+	defer Recover(ctx, "core.Step")
 	select {
 	case msg := <-ctx.Mailbox():
 		loop = lib.HandleMsg(ctx, msg)
@@ -45,6 +47,20 @@ func HandleDone(ctx lib.Context) bool {
 	return false
 }
 
+// Recover checks if there was a panic condition and recovers from it.
+// In this case the error is logged and returned.
+// Returns the error (or nil if there wasn't any).
+func Recover(ctx lib.Context, txt string) interface{} {
+	err := recover()
+	if err != nil {
+		if estr, ok := err.(string); ok {
+			err = fmt.Errorf(estr)
+		}
+		logging.Error(ctx, err.(error)).Msg(txt)
+	}
+	return err
+}
+
 func init() {
 	config.DefaultStart = Start // avoid import cycle
 	config.DefaultStep = Step