Use go generate and stringer for sealing_state.String()

To run the generator `go generate ./sealing_state`.
To install `stringer`: `go get golang.org/x/tools/cmd/stringer`.

Also run `go mod tidy`.

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

go.mod

@@ -3,21 +3,10 @@ module github.com/filecoin-project/go-sectorbuilder
 go 1.12
 
 require (
-	github.com/golangci/golangci-lint v1.17.1 // indirect
-	github.com/hashicorp/golang-lru v0.5.3 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/ipfs/go-log v0.0.1
-	github.com/neelance/parallel v0.0.0-20160708114440-4de9ce63d14c // indirect
-	github.com/opentracing/basictracer-go v1.0.0 // indirect
 	github.com/pkg/errors v0.8.1
-	github.com/prometheus/client_golang v1.1.0 // indirect
-	github.com/slimsag/godocmd v0.0.0-20161025000126-a1005ad29fe3 // indirect
-	github.com/sourcegraph/ctxvfs v0.0.0-20180418081416-2b65f1b1ea81 // indirect
-	github.com/sourcegraph/go-langserver v2.0.0+incompatible // indirect
-	github.com/sourcegraph/jsonrpc2 v0.0.0-20190106185902-35a74f039c6a // indirect
 	github.com/stretchr/testify v1.3.0
-	golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4 // indirect
 	golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7 // indirect
 	golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a // indirect
-	golang.org/x/text v0.3.2 // indirect
-	golang.org/x/tools v0.0.0-20190813142322-97f12d73768f // indirect
 )

sealing_state/state.go

 package sealing_state
 
+//go:generate stringer -type=State
+
 // State communicates the state of the sector with respect to sealing.
 type State int
 
@@ -12,17 +14,3 @@ const (
 	Paused                // sector sealing has been paused and can be resumed
 	ReadyForSealing       // staged sector is full and is ready to seal
 )
-
-var labels = [...]string{
-	"Unknown",
-	"Pending",
-	"Failed",
-	"Sealing",
-	"Sealed",
-	"Paused",
-	"ReadyForSealing",
-}
-
-func (el State) String() string {
-	return labels[el]
-}

sealing_state/state_string.go

+// Code generated by "stringer -type=State"; DO NOT EDIT.
+
+package sealing_state
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[Unknown-0]
+	_ = x[Pending-1]
+	_ = x[Failed-2]
+	_ = x[Sealing-3]
+	_ = x[Sealed-4]
+	_ = x[Paused-5]
+	_ = x[ReadyForSealing-6]
+}
+
+const _State_name = "UnknownPendingFailedSealingSealedPausedReadyForSealing"
+
+var _State_index = [...]uint8{0, 7, 14, 20, 27, 33, 39, 54}
+
+func (i State) String() string {
+	if i < 0 || i >= State(len(_State_index)-1) {
+		return "State(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+	return _State_name[_State_index[i]:_State_index[i+1]]
+}