refactor: implement most of ps plugin in golang

plugins/common/common.go

@@ -9,6 +9,7 @@ import (
 	"reflect"
 	"regexp"
 	"sort"
+	"strconv"
 	"strings"
 	"unicode"
 
@@ -379,6 +380,16 @@ func ToBool(s string) bool {
 	return s == "true"
 }
 
+// ToInt returns an int value for a given string
+func ToInt(s string, defaultValue int) int {
+	i, err := strconv.Atoi(s)
+	if err != nil {
+		return defaultValue
+	}
+
+	return i
+}
+
 // UcFirst uppercases the first character in a string
 func UcFirst(str string) string {
 	for i, v := range str {