Add usage for --format-compact option

cmd/main.go

@@ -28,6 +28,9 @@ func Run(name string, args []string) error {
 	case err != nil:
 		usage(os.Stderr, name, flags)
 		return err
+	case opts.formatOptions.CompactPkgNameFormat == "help":
+		testjson.CompactFormatUsage(os.Stderr, name)
+		return nil
 	}
 	opts.args = flags.Args()
 	setupLogging(opts)
@@ -144,7 +147,7 @@ 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-compact          print multiple packages per line in a compact format
+    pkgname-compact          print multiple packages per line, see --format-compact help for options
     testname                 print a line for each test and package
     standard-quiet           standard go test format
     standard-verbose         standard go test -v format

cmd/testdata/gotestsum-help-text

@@ -36,7 +36,7 @@ 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-compact          print multiple packages per line in a compact format
+    pkgname-compact          print multiple packages per line, see --format-compact help for options
     testname                 print a line for each test and package
     standard-quiet           standard go test format
     standard-verbose         standard go test -v format

testjson/compactformat.go

@@ -2,6 +2,7 @@ package testjson
 
 import (
 	"bufio"
+	"fmt"
 	"io"
 	"os"
 	"regexp"
@@ -16,6 +17,17 @@ import (
 
 const CompactFormats = "relative, short, partial, partial-back"
 
+func CompactFormatUsage(out io.Writer, name string) {
+	fmt.Fprintf(out, `
+Formats:
+	relative (default)       print the full relative path to the package
+	short                    print the last path segment of the package
+	partial                  print newly entered path segments for each package
+	partial-back             partial with an indication when it backs out
+
+`)
+}
+
 type PkgTracker struct {
 	opts    FormatOptions
 	lastPkg string