Add more 'man page' like functionality

utils/help_parser.go

@@ -0,0 +1,77 @@
+package utils
+
+import (
+	"reflect"
+	"regexp"
+	"strconv"
+	"unicode"
+	"unicode/utf8"
+
+	"github.com/wtfutil/wtf/cfg"
+)
+
+func lowercaseTitle(title string) string {
+	if title == "" {
+		return ""
+	}
+	r, n := utf8.DecodeRuneInString(title)
+	return string(unicode.ToLower(r)) + title[n:]
+}
+
+var (
+	openColorRegex = regexp.MustCompile(`\[.*?\]`)
+)
+
+func StripColorTags(input string) string {
+	return openColorRegex.ReplaceAllString(input, "")
+}
+
+func helpFromValue(field reflect.StructField) string {
+	result := ""
+	var help string = field.Tag.Get("help")
+	optional, err := strconv.ParseBool(field.Tag.Get("optional"))
+	if err != nil {
+		optional = false
+	}
+	var values string = field.Tag.Get("values")
+	if optional {
+		help = "Optional " + help
+	}
+	if help != "" {
+		result += "\n\n" + lowercaseTitle(field.Name)
+		result += "\n" + help
+		if values != "" {
+			result += "\nValues: " + values
+		}
+	}
+
+	return result
+}
+
+func HelpFromInterface(item interface{}) string {
+
+	result := ""
+	t := reflect.TypeOf(item)
+
+	for i := 0; i < t.NumField(); i++ {
+		field := t.Field(i)
+
+		kind := field.Type.Kind()
+		if field.Type.Kind() == reflect.Ptr {
+			kind = field.Type.Elem().Kind()
+		}
+
+		if field.Name == "common" {
+			result += HelpFromInterface(cfg.Common{})
+		}
+
+		switch kind {
+		case reflect.Interface:
+			result += HelpFromInterface(field.Type.Elem())
+		default:
+			result += helpFromValue(field)
+		}
+	}
+
+	return result
+}