dev: improve --presets and --out-format flags help (#5251)

Co-authored-by: Fernandez Ludovic <ldez@users.noreply.github.com>

Author: alexandear

pkg/commands/flagsets.go

@@ -28,11 +28,11 @@ func setupLintersFlagSet(v *viper.Viper, fs *pflag.FlagSet) {
 		color.GreenString("Enable only fast linters from enabled linters set (first run won't be fast)"))
 
 	internal.AddHackedStringSliceP(fs, "presets", "p",
-		color.GreenString(fmt.Sprintf("Enable presets (%s) of linters.\n"+
-			"Run 'golangci-lint help linters' to see them.\n"+
+		formatList("Enable presets of linters:", lintersdb.AllPresets(),
+			"Run 'golangci-lint help linters' to see them.",
 			"This option implies option --disable-all",
-			strings.Join(lintersdb.AllPresets(), "|"),
-		)))
+		),
+	)
 
 	fs.StringSlice("enable-only", nil,
 		color.GreenString("Override linters configuration section to only run the specific linter(s)")) // Flags only.
@@ -57,7 +57,7 @@ func setupRunFlagSet(v *viper.Viper, fs *pflag.FlagSet) {
 	internal.AddDeprecatedHackedStringSlice(fs, "skip-files", color.GreenString("Regexps of files to skip"))
 	internal.AddDeprecatedHackedStringSlice(fs, "skip-dirs", color.GreenString("Regexps of directories to skip"))
 	internal.AddDeprecatedFlagAndBind(v, fs, fs.Bool, "skip-dirs-use-default", "run.skip-dirs-use-default", true,
-		getDefaultDirectoryExcludeHelp())
+		formatList("Use or not use default excluded directories:", processors.StdExcludeDirRegexps))
 
 	const allowParallelDesc = "Allow multiple parallel golangci-lint instances running.\n" +
 		"If false (default) - golangci-lint acquires file lock on start."
@@ -70,7 +70,7 @@ func setupRunFlagSet(v *viper.Viper, fs *pflag.FlagSet) {
 
 func setupOutputFlagSet(v *viper.Viper, fs *pflag.FlagSet) {
 	internal.AddFlagAndBind(v, fs, fs.String, "out-format", "output.formats", config.OutFormatColoredLineNumber,
-		color.GreenString(fmt.Sprintf("Formats of output: %s", strings.Join(config.AllOutputFormats, "|"))))
+		formatList("Formats of output:", config.AllOutputFormats))
 	internal.AddFlagAndBind(v, fs, fs.Bool, "print-issued-lines", "output.print-issued-lines", true,
 		color.GreenString("Print lines of code with issue"))
 	internal.AddFlagAndBind(v, fs, fs.Bool, "print-linter-name", "output.print-linter-name", true,
@@ -102,7 +102,7 @@ func setupIssuesFlagSet(v *viper.Viper, fs *pflag.FlagSet) {
 	internal.AddHackedStringSlice(fs, "exclude-files", color.GreenString("Regexps of files to exclude"))
 	internal.AddHackedStringSlice(fs, "exclude-dirs", color.GreenString("Regexps of directories to exclude"))
 	internal.AddFlagAndBind(v, fs, fs.Bool, "exclude-dirs-use-default", "issues.exclude-dirs-use-default", true,
-		getDefaultDirectoryExcludeHelp())
+		formatList("Use or not use default excluded directories:", processors.StdExcludeDirRegexps))
 
 	internal.AddFlagAndBind(v, fs, fs.String, "exclude-generated", "issues.exclude-generated", processors.AutogeneratedModeLax,
 		color.GreenString("Mode of the generated files analysis"))
@@ -124,6 +124,23 @@ func setupIssuesFlagSet(v *viper.Viper, fs *pflag.FlagSet) {
 		color.GreenString("Fix found issues (if it's supported by the linter)"))
 }
 
+func formatList(head string, items []string, foot ...string) string {
+	parts := []string{color.GreenString(head)}
+	for _, p := range items {
+		parts = append(parts, fmt.Sprintf("  - %s", color.YellowString(p)))
+	}
+
+	for _, s := range foot {
+		parts = append(parts, color.GreenString(s))
+	}
+
+	if len(foot) == 0 {
+		parts = append(parts, "")
+	}
+
+	return strings.Join(parts, "\n")
+}
+
 func getDefaultIssueExcludeHelp() string {
 	parts := []string{color.GreenString("Use or not use default excludes:")}
 
@@ -136,12 +153,3 @@ func getDefaultIssueExcludeHelp() string {
 
 	return strings.Join(parts, "\n")
 }
-
-func getDefaultDirectoryExcludeHelp() string {
-	parts := []string{color.GreenString("Use or not use default excluded directories:")}
-	for _, dir := range processors.StdExcludeDirRegexps {
-		parts = append(parts, fmt.Sprintf("  - %s", color.YellowString(dir)))
-	}
-	parts = append(parts, "")
-	return strings.Join(parts, "\n")
-}