From 07269ce70bcf1d530c5954b9e60fd7b076646182 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joaqu=C3=ADn=20Fern=C3=A1ndez=20Campo?= <jfcampo@gmail.com>
Date: Sun, 19 Jan 2020 17:39:42 +0100
Subject: [PATCH 1/2] Fixed panic on bad runtime flags.

An FSM is not generated if you use a matching regex.

Signed-off-by: Joaquin Fernandez Campo <jfcampo@gmail.com>
---
 main.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/main.go b/main.go
index 5ff8f21..e8ed549 100644
--- a/main.go
+++ b/main.go
@@ -229,6 +229,9 @@ func init() {
 }
 
 func dumpFSM(mapper *mapper.MetricMapper, dumpFilename string, logger log.Logger) error {
+	if mapper.FSM == nil {
+		return fmt.Errorf("FSM is not available. Posible due to the presence of regex patterns")
+	}
 	f, err := os.Create(dumpFilename)
 	if err != nil {
 		return err

From d81bdf2d3af109f1f4087f67db58fa8e4a8a4702 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joaqu=C3=ADn=20Fern=C3=A1ndez=20Campo?=
 <xocasdashdash@users.noreply.github.com>
Date: Mon, 20 Jan 2020 11:37:30 +0100
Subject: [PATCH 2/2] Update main.go

Co-Authored-By: Matthias Rampke <mr@soundcloud.com>
Signed-off-by: Joaquin Fernandez Campo <jfcampo@gmail.com>
---
 main.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/main.go b/main.go
index e8ed549..cd0c26b 100644
--- a/main.go
+++ b/main.go
@@ -230,7 +230,7 @@ func init() {
 
 func dumpFSM(mapper *mapper.MetricMapper, dumpFilename string, logger log.Logger) error {
 	if mapper.FSM == nil {
-		return fmt.Errorf("FSM is not available. Posible due to the presence of regex patterns")
+		return fmt.Errorf("no FSM available to be dumped, possibly because the mapping contains regex patterns")
 	}
 	f, err := os.Create(dumpFilename)
 	if err != nil {