Switch to GOTEST_SKIPNOTESTS instead of the -skipnotest

Filtering out the flags and arguments are making it harder to maintain
the tool and we don't have comphensive testing to capture all the
significant failure modes. Switching to an environment variable.

main.go

@@ -8,7 +8,6 @@ package main
 
 import (
 	"bufio"
-	"flag"
 	"fmt"
 	"io"
 	"log"
@@ -23,37 +22,24 @@ import (
 )
 
 var (
-	pass   = color.FgGreen
-	skip   = color.FgYellow
-	fail   = color.FgHiRed
-	ignore *bool
+	pass = color.FgGreen
+	skip = color.FgYellow
+	fail = color.FgHiRed
+
+	skipnotest bool
 )
 
-const paletteEnv = "GOTEST_PALETTE"
+const (
+	paletteEnv     = "GOTEST_PALETTE"
+	skipNoTestsEnv = "GOTEST_SKIPNOTESTS"
+)
 
 func main() {
-	setPalette()
+	enablePalette()
+	enableSkipNoTests()
 	enableOnCI()
 
-	flagSet := flag.NewFlagSet("gotestFlags", flag.ContinueOnError)
-	ignore = flagSet.Bool("skipnotest", false, "skip packages with no test files")
-	gotestFlags := make([]string, 0)
-	args := make([]string, 0)
-
-	//separate program specific flags from go test flags
-	for _, arg := range os.Args[1:] {
-		// if the argument is in gotest flags the add it to gotestFlags
-		lookup := flagSet.Lookup(strings.Trim(arg, "-"))
-		if lookup != nil {
-			gotestFlags = append(gotestFlags, arg)
-		} else {
-			args = append(args, arg)
-		}
-	}
-
-	flagSet.Parse(gotestFlags)
-	os.Exit(gotest(args))
-
+	os.Exit(gotest(os.Args[1:]))
 }
 
 func gotest(args []string) int {
@@ -121,16 +107,12 @@ func parse(line string) {
 
 	var c color.Attribute
 	switch {
-	case strings.HasPrefix(trimmed, "=== RUN"):
-		fallthrough
-	case strings.HasPrefix(trimmed, "?"):
-		if *ignore {
+	case strings.Contains(trimmed, "[no test files]"):
+		if skipnotest {
 			return
 		}
-		color.Unset()
 
-		// passed
-	case strings.HasPrefix(trimmed, "--- PASS"):
+	case strings.HasPrefix(trimmed, "--- PASS"): // passed
 		fallthrough
 	case strings.HasPrefix(trimmed, "ok"):
 		fallthrough
@@ -168,7 +150,7 @@ func enableOnCI() {
 	}
 }
 
-func setPalette() {
+func enablePalette() {
 	v := os.Getenv(paletteEnv)
 	if v == "" {
 		return
@@ -185,6 +167,15 @@ func setPalette() {
 	}
 }
 
+func enableSkipNoTests() {
+	v := os.Getenv(skipNoTestsEnv)
+	if v == "" {
+		return
+	}
+	v = strings.ToLower(v)
+	skipnotest = v == "true"
+}
+
 var colors = map[string]color.Attribute{
 	"black":     color.FgBlack,
 	"hiblack":   color.FgHiBlack,