caddycmd: Add --skip-standard to list-modules command, quieter output

cmd/commandfuncs.go

@@ -360,6 +360,7 @@ func cmdBuildInfo(fl Flags) (int, error) {
 func cmdListModules(fl Flags) (int, error) {
 	packages := fl.Bool("packages")
 	versions := fl.Bool("versions")
+	skipStandard := fl.Bool("skip-standard")
 
 	printModuleInfo := func(mi moduleInfo) {
 		fmt.Print(mi.caddyModuleID)
@@ -388,23 +389,30 @@ func cmdListModules(fl Flags) (int, error) {
 		return caddy.ExitCodeSuccess, nil
 	}
 
-	if len(standard) > 0 {
-		for _, mod := range standard {
-			printModuleInfo(mod)
+	// Standard modules (always shipped with Caddy)
+	if !skipStandard {
+		if len(standard) > 0 {
+			for _, mod := range standard {
+				printModuleInfo(mod)
+			}
 		}
+		fmt.Printf("\n  Standard modules: %d\n", len(standard))
 	}
-	fmt.Printf("\n  Standard modules: %d\n", len(standard))
+
+	// Non-standard modules (third party plugins)
 	if len(nonstandard) > 0 {
-		if len(standard) > 0 {
+		if len(standard) > 0 && !skipStandard {
 			fmt.Println()
 		}
 		for _, mod := range nonstandard {
 			printModuleInfo(mod)
 		}
 	}
 	fmt.Printf("\n  Non-standard modules: %d\n", len(nonstandard))
+
+	// Unknown modules (couldn't get Caddy module info)
 	if len(unknown) > 0 {
-		if len(standard) > 0 || len(nonstandard) > 0 {
+		if (len(standard) > 0 && !skipStandard) || len(nonstandard) > 0 {
 			fmt.Println()
 		}
 		for _, mod := range unknown {

cmd/commands.go

@@ -208,6 +208,7 @@ config file; otherwise the default is assumed.`,
 			fs := flag.NewFlagSet("list-modules", flag.ExitOnError)
 			fs.Bool("packages", false, "Print package paths")
 			fs.Bool("versions", false, "Print version information")
+			fs.Bool("skip-standard", false, "Skip printing standard modules")
 			return fs
 		}(),
 	})

cmd/packagesfuncs.go

@@ -220,7 +220,7 @@ func getModules() (standard, nonstandard, unknown []moduleInfo, err error) {
 }
 
 func listModules(path string) error {
-	cmd := exec.Command(path, "list-modules", "--versions")
+	cmd := exec.Command(path, "list-modules", "--versions", "--skip-standard")
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr
 	err := cmd.Run()