mediawiki转markdown(port to golang)

原PHP实现地址:

https://github.com/philipashlock/mediawiki-to-markdown/blob/master/convert.php

翻译到Golang的实现如下:

package main
import (
	"bytes"
	"fmt"
	"github.com/docopt/docopt-go"
	"github.com/antchfx/xmlquery"
	"golang.org/x/text/encoding/simplifiedchinese"
	"golang.org/x/text/transform"
	"io"
	"io/ioutil"
	"os"
	"os/exec"
	"path/filepath"
	"regexp"
	"strconv"
	"strings"
	"html"
)

var g_re = regexp.MustCompile("/\\[\\[(.+?)\\]\\]/")
func main() {
	usage := `Wiki2Md.
Usage:
  wiki2md --filename=<name> [--output=<export>] [--indexes=<true|false>] [--format=<markdown_phpextra|markdown_github>] [--frontmatter=<true|false>]
Options:
  --filename==<filename>  the name of the xml file you exported from MediaWiki.
  --output==<output>    specify an output folder since each wiki page in the XML file will generate it"s own separate markdown file.
  --indexes==<indexes>    set indexes as true if you want pages with the same name as a directory to be renamed as index.md and placed into their directory.
  --frontmatter==<frontmatter> specify whether you want frontmatter included. This is automatically set to true when the output format is markdown_github.
  --format==<format>    specify different output formats with format. The default is markdown_github.[default: markdown_github]`
	arguments, err := docopt.Parse(usage, nil, true, "blah 1.0", false)
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Println(arguments["--filename"])
	if (arguments["--filename"]==nil || arguments["--filename"].(string) == "") {
		fmt.Println("No input file specified. Use --filename=mediawiki.xml");
		return
	}
	output_path := "";
	if (arguments["--output"]!=nil && arguments["--output"].(string) != "") {
		output_path = arguments["--output"].(string);
		if _, err := os.Stat(output_path); os.IsNotExist(err) {
			fmt.Println("Creating output directory %s", output_path);
			err = os.MkdirAll(output_path, 0777)
			if err != nil {
				fmt.Println(err)
				return
			}
		}
	}
	format := "markdown_github";
	if (arguments["--format"] !=nil && arguments["--format"].(string) != "") {
		format = arguments["--format"].(string);
	}
	add_meta := false;
	if ((arguments["--frontmatter"] != nil && arguments["--frontmatter"].(string) != "") || ((arguments["--frontmatter"]==nil || arguments["--frontmatter"].(string) == "") && format == "markdown_github")) {
		add_meta = true;
	}
	// Load XML file
	buf, err := ioutil.ReadFile(arguments["--filename"].(string)); // just pass the file name
	if err != nil {
		fmt.Print(err)
	}
	file := string(buf);
	xml := strings.ReplaceAll( file,"xmlns = ","ns = "); //string is a string that contains xml...
	doc,err := xmlquery.Parse(strings.NewReader(xml))
	result := xmlquery.Find(doc, "//page")
	count := 0;
	directory_list := map[string]bool{}
	// Iterate through XML
	for _,node := range result {
	    title := xmlquery.FindOne(node,"//title");
	    titleStr := title.InnerText();//title[0];
	    url := strings.Replace(titleStr," ", "_", -1);
		url = strings.Replace(url,"\"", "", -1);
		directory := "";
		filename := url;
		slash := strings.Index(url, "/");
	    if(slash != -1){
	        titleStr = strings.Replace(titleStr,"/", " ", -1);
	        directory = url[0:slash];
	        filename = url[slash+1:];
	        directory_list[directory] = true;
	    }

	    text := xmlquery.FindOne(node,"//revision//text");
	    textStr := text.InnerText();//text[0];
	    textStr = html.UnescapeString(textStr); // decode inline html
		g_re = regexp.MustCompile("/\\[\\[(.+?)\\]\\]/")
	    textStr = g_re.ReplaceAllStringFunc(textStr,new_link); // adds leading slash to links, "absolute-path reference"
	    // prepare to append page title frontmatter to text
		frontmatter := "";
	    if (add_meta) {    
	        frontmatter = "---\n";
	        frontmatter += "title: "+titleStr+"\n";
	        frontmatter += "permalink: /"+url+"/\n";
	        frontmatter += "---\n\n";
	    }
	    //==================
	    //pandoc 01_overview.mediawiki -f mediawiki -t markdown -o Project-Handbook_01_Overview.md
		var stdout bytes.Buffer
		var stderr bytes.Buffer
	    Param := "-f mediawiki -t "+format;
		params := []string{"/C", "pandoc"} //
		params = append(params, strings.Split(Param, " ")...)
		cmd := exec.Command("cmd", params...)
		stdin, err := cmd.StdinPipe()
		if err != nil {
			fmt.Println(err) //replace with logger, or anything you want
		}
		//cmd.Stdout = os.Stdout
		//cmd.Stderr = os.Stderr
		cmd.Stdout = &stdout
		cmd.Stderr = &stderr
		fmt.Println("START") //for debug
		if err = cmd.Start(); err != nil { //Use start, not run
			fmt.Println("An error occured: ", err) //replace with logger, or anything you want
		}
		io.WriteString(stdin, textStr)
		stdin.Close()
		cmd.Wait()
		fmt.Println("END") //for debug
		bt,err := GbkToUtf8([]byte(stderr.String()))
		bs :=  stdout.String()+string(bt);//
		if err != nil {
			fmt.Println("execbat:err"+err.Error()+"\n"+ bs)
		} else {
			fmt.Println( bs)
		}
		//====================
		textStr = bs;
	    textStr = strings.Replace(textStr, "\\_", "_",-1);
	    if (add_meta) {
	        textStr = frontmatter + textStr;
	    }
	    if len(output_path)>0 && output_path[len(output_path)-1:] != "/" {
			output_path = output_path + "/";
		}
	    directory = output_path + directory;
	    // create directory if necessary
	    if(directory!="") {
		    if _, err := os.Stat(directory); os.IsNotExist(err) {
	            os.Mkdir(directory,0777);
	        }
		    if len(directory)>0 && directory[len(directory)-1:]!="/" {
				directory = directory + "/";
			}
	    }
	    // create file
	    pt := normalizePath(directory + filename + ".md")
		err = ioutil.WriteFile(pt, []byte(textStr), 0755)
		if err != nil {
			fmt.Println(err)
			return
		}

	    count++;
	}
	// Rename and move files with the same name as directories
	if (len(directory_list)!=0 && arguments["--indexes"]!=nil && arguments["--indexes"].(string)!="") {
		directory_list_keys := make([]string, len(directory_list))
		i := 0
		for k := range directory_list {
			directory_list_keys[i] = k
			i++
		}

		for _,directory_name := range directory_list_keys {
			if _, err := os.Stat(output_path+directory_name+".md"); os.IsNotExist(err) {
				os.Rename(output_path+directory_name+".md", output_path+directory_name+"/index.md");
			}
		}
	}
	if (count > 0) {
		fmt.Println(strconv.Itoa(count) + " files converted");
	}
}

func GbkToUtf8(s []byte) ([]byte, error) {
	reader := transform.NewReader(bytes.NewReader(s), simplifiedchinese.GBK.NewDecoder())
	d, e := ioutil.ReadAll(reader)
	if e != nil {
		return nil, e
	}
	return d, nil
}

func new_link(m string) string {
	matches := g_re.FindStringSubmatch(m)
    if(strings.Index(matches[1], "|") != -1) {
        new_link := strings.ReplaceAll(matches[1]," ", "_");
        return "[[/"+new_link+"|{"+matches[1]+"}]]";
    } else {
        link := strings.TrimSpace((matches[1])[0:(strings.Index(matches[1], "|"))]);
        link = "/" + strings.ReplaceAll(link," ", "_");
        link_text := strings.TrimSpace((matches[1])[(strings.Index(matches[1], "|")+1):]);
        return "[["+link+"|"+link_text+"]]";
    }
}
func Explode(delimiter, text string) []string {
	if len(delimiter) > len(text) {
		return strings.Split(delimiter, text)
	} else {
		return strings.Split(text, delimiter)
	}
}
func Implode(glue string, pieces []string) string {
	return strings.Join(pieces, glue)
}
type stack []string
func (s stack) Push(v string) stack {
	return append(s, v)
}
func (s stack) Pop() (stack, string) {
	// FIXME: What do we do if the stack is empty, though?
	l := len(s)
	if l==0 {
		return s,""
	}
	return  s[:l-1], s[l-1]
}

func GetCurrentDirectory() string {
	dir, err := filepath.Abs(filepath.Dir(os.Args[0])) //返回绝对路径  filepath.Dir(os.Args[0])去除最后一个元素的路径
	if err != nil {
		fmt.Println(err.Error())
	}
	return strings.Replace(dir, "\\", "/", -1) //将\替换成/
}
// Borrowed from http://php.net/manual/en/func.realpath.php
func normalizePath(path string) string {
	if !strings.HasPrefix(path, ".") {
		return path
	}
	return filepath.Join(GetCurrentDirectory(), path)
}