consolidate cmd routing into main

cmd/main.go

@@ -115,24 +115,26 @@ func usage(out io.Writer, name string, flags *pflag.FlagSet) {
     %[1]s [flags] [--] [go test flags]
     %[1]s [command]
 
+See https://pkg.go.dev/gotest.tools/gotestsum#section-readme for detailed documentation.
+
 Flags:
 `, name)
 	flags.SetOutput(out)
 	flags.PrintDefaults()
-	fmt.Fprint(out, `
+	fmt.Fprintf(out, `
 Formats:
-    dots                    print a character for each test
-    dots-v2                 experimental dots format, one package per line
-    pkgname                 print a line for each package
-    pkgname-and-test-fails  print a line for each package and failed test output
-    testname                print a line for each test and package
-    standard-quiet          standard go test format
-    standard-verbose        standard go test -v format
+    dots                     print a character for each test
+    dots-v2                  experimental dots format, one package per line
+    pkgname                  print a line for each package
+    pkgname-and-test-fails   print a line for each package and failed test output
+    testname                 print a line for each test and package
+    standard-quiet           standard go test format
+    standard-verbose         standard go test -v format
 
 Commands:
-    tool                    tools for working with test2json output
-    help                    print this help next
-`)
+    %[1]s tool slowest   find or skip the slowest tests
+    %[1]s help           print this help next
+`, name)
 }
 
 func lookEnvWithDefault(key, defValue string) string {

cmd/testdata/gotestsum-help-text

@@ -2,6 +2,8 @@ Usage:
     gotestsum [flags] [--] [go test flags]
     gotestsum [command]
 
+See https://pkg.go.dev/gotest.tools/gotestsum#section-readme for detailed documentation.
+
 Flags:
       --debug                                       enabled debug logging
   -f, --format string                               print format of test input (default "short")
@@ -23,14 +25,14 @@ Flags:
       --watch                                       watch go files, and run tests when a file is modified
 
 Formats:
-    dots                    print a character for each test
-    dots-v2                 experimental dots format, one package per line
-    pkgname                 print a line for each package
-    pkgname-and-test-fails  print a line for each package and failed test output
-    testname                print a line for each test and package
-    standard-quiet          standard go test format
-    standard-verbose        standard go test -v format
+    dots                     print a character for each test
+    dots-v2                  experimental dots format, one package per line
+    pkgname                  print a line for each package
+    pkgname-and-test-fails   print a line for each package and failed test output
+    testname                 print a line for each test and package
+    standard-quiet           standard go test format
+    standard-verbose         standard go test -v format
 
 Commands:
-    tool                    tools for working with test2json output
-    help                    print this help next
+    gotestsum tool slowest   find or skip the slowest tests
+    gotestsum help           print this help next

main.go

@@ -1,10 +1,11 @@
 package main
 
 import (
+	"fmt"
 	"os"
 
 	"gotest.tools/gotestsum/cmd"
-	"gotest.tools/gotestsum/cmd/tool"
+	"gotest.tools/gotestsum/cmd/tool/slowest"
 	"gotest.tools/gotestsum/internal/log"
 )
 
@@ -25,13 +26,49 @@ func main() {
 
 func route(args []string) error {
 	name := args[0]
-	next, rest := cmd.Next(args[1:])
+	next, rest := nextArg(args[1:])
 	switch next {
 	case "help", "?":
 		return cmd.Run(name, []string{"--help"})
 	case "tool":
-		return tool.Run(name+" "+next, rest)
+		return toolRun(name+" "+next, rest)
 	default:
 		return cmd.Run(name, args[1:])
 	}
 }
+
+// nextArg splits args into the next positional argument and any remaining args.
+func nextArg(args []string) (string, []string) {
+	switch len(args) {
+	case 0:
+		return "", nil
+	case 1:
+		return args[0], nil
+	default:
+		return args[0], args[1:]
+	}
+}
+
+func toolRun(name string, args []string) error {
+	usage := func(name string) string {
+		return fmt.Sprintf(`Usage: %[1]s COMMAND [flags]
+
+Commands:
+    %[1]s slowest      find or skip the slowest tests
+
+Use '%[1]s COMMAND --help' for command specific help.
+`, name)
+	}
+
+	next, rest := nextArg(args)
+	switch next {
+	case "", "help", "?":
+		fmt.Println(usage(name))
+		return nil
+	case "slowest":
+		return slowest.Run(name+" "+next, rest)
+	default:
+		fmt.Fprintln(os.Stderr, usage(name))
+		return fmt.Errorf("invalid command: %v %v", name, next)
+	}
+}