Tool for measuring code metrics in given directory

CodeMetrics.go

/*
 *
 * This is a Go Application for measuring code metrics
 * File selection can be included via arguments as extension, or:
 * 		append '+' for exclusion as filename
 * 		append '-' for exclusion as filename
 *		append '!' for exclusion as extension
 *
 * Compile => go build -o CodeMetrics.exe CodeMetrics.go
 * Launch  => CodeMetrics js !min.js
 * License => MIT (c) 2018 Wildan Mubarok
 *
 */

package main

import (
	"bufio"
	"fmt"
	"os"
	"path/filepath"
	"regexp"
	"strings"
)

func main() {
	path, err := os.Getwd()
	if err != nil {
		panic(err)
	}

	a := os.Args[1:]
	b := make([]string, 0)
	c := []string{"/\\."}
	for _, v := range a {
		s := strings.Replace(strings.Replace(v, ".", "\\.", -1), "*", ".*", -1)
		if v[0] == '-' {
			c = append(c, s[1:])
		} else if v[0] == '!' {
			c = append(c, "."+s[1:]+"$")
		} else if v[0] == '+' {
			b = append(b, "."+s[1:])
		} else {
			b = append(b, "."+s+"$")
		}
	}

	// join extensions from separate arguments
	execute(path, strings.Join(b, "|"), strings.Join(c, "|"))
}

func execute(pathS string, incl string, excl string) {

	var bytes, files, chars, lines, nonwhitelines int64

	regexincl, err := regexp.Compile("(" + incl + ")")
	if err != nil {
		panic(err)
	}
	regexexcl, err := regexp.Compile("(" + excl + ")")
	if err != nil {
		panic(err)
	}

	fmt.Println("Scanning ", pathS)

	filepath.Walk(pathS, func(path string, f os.FileInfo, _ error) error {
		if !f.IsDir() {
			name := f.Name()
			r := regexincl.MatchString(name) && !regexexcl.MatchString(name)
			if r && !f.IsDir() {
				file, err := os.Open(path)
				if err == nil {
					scanner := bufio.NewScanner(file)
					for scanner.Scan() {
						txt := scanner.Text()
						trimmed := strings.Trim(txt, " \t\n\r")
						bytes += int64(len(txt))
						chars += int64(len(trimmed))
						lines++
						if len(trimmed) > 0 {
							nonwhitelines++
						}
					}
					fmt.Println("Scanned ", name)
					files++
				}
				defer file.Close()
			}
		}
		return nil
	})
	fmt.Println()
	fmt.Println("Total files:                ", files)
	fmt.Println("Total bytes:                ", bytes)
	fmt.Println("Total non-blank characters: ", chars)
	fmt.Println("Total lines:                ", lines)
	fmt.Println("Total nonblank lines:       ", nonwhitelines)
	fmt.Println("Done. Press enter to quit.")
	bufio.NewReader(os.Stdin).ReadByte()
}