A Go Lang Program to Convert Special Symbols to HTML Entities

html_entities.go

package main

import (
	"fmt"
	"bufio"
	"os"
	"strconv"
)

func ReadLinesFromFile(file_path string) ([]string, error) {
	var lines []string
	src_file, err := os.Open(file_path)
	if err != nil { panic(err) }
	defer func() {
		src_file.Close()
	}()
	reader := bufio.NewScanner(src_file)
	for reader.Scan() {
		lines = append(lines, LineToHTMLEntities(reader.Text()))
  }
  return lines, reader.Err()
}

func WriteLinesToFile(file_path string, lines []string) error {
	dst_file, err := os.Create(file_path)
	if err != nil { panic(err) }
	defer func() {
		dst_file.Close()
	}()
	writer := bufio.NewWriter(dst_file)
	for i := 0; i < len(lines); i++ {
		fmt.Fprintln(writer, lines[i])
	}
	return writer.Flush()
}

func LineToHTMLEntities(line string) string {
	var converted string = ""
	for _, rune_value := range line {
		converted += RuneToHTMLEntity(rune_value)
	}
  return converted
}

func RuneToHTMLEntity(entity rune) string {
	if (entity < 128) {
		return string(entity)
	} else {
		return "&#" + strconv.FormatInt(int64(entity), 10) + ";"
	}
}

func main() {
	var srcFile string = "input.txt"
	var dstFile string = "output.txt"
	convertedLines, err := ReadLinesFromFile(srcFile)
	if (err != nil) { fmt.Println(err) }
	if err := WriteLinesToFile(dstFile, convertedLines); err != nil {
		fmt.Println(err)
	}
}