Add a slug field to every post in Hugo to avoid periods and caps in urls

slugify-hugo.go

package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"path/filepath"
	"regexp"
	"strings"
)

func main() {
	searchDir := "."

	fileList := []string{}
	err := filepath.Walk(searchDir, func(path string, f os.FileInfo, err error) error {
		fileList = append(fileList, path)
		return nil
	})

	if err != nil {
		fmt.Println(err)
	}

	var re = regexp.MustCompile("[^a-z0-9]+")

	for _, file := range fileList {
		var slug string
		//fmt.Println(file)
		if len(file) >= 3 {
			slug = strings.Trim(re.ReplaceAllString(strings.ToLower(file[:len(file)-3]), "-"), "-")
			fmt.Println(slug)

			input, err := ioutil.ReadFile(file)
			if err != nil {
				log.Fatalln(err)
			}

			lines := strings.Split(string(input), "\n")
			slugline := "slug: \"" + slug + "\""
			lines2 := []string{}
			for i, line := range lines {
				lines2 = append(lines2, line)
				if i == 1 {
					lines2 = append(lines2, slugline)
				}
			}
			output := strings.Join(lines2, "\n")
			err = ioutil.WriteFile(file, []byte(output), 0644)
			if err != nil {
				log.Fatalln(err)
			}
		}
	}
}