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annotate wdown.go @ 10:1ffe6e4f933c

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Add math support through MathJax
author Jonatan Werpers <jonatan@werpers.com>
date Wed, 17 Jun 2020 22:13:03 +0200
parents a5aa39557726
children ebecd141e9d3
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1 package main
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2
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3 import (
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4 "bytes"
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5 "flag"
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6 "fmt"
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7 "io/ioutil"
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8 "log"
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9 "os"
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10
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11 "github.com/cbroglie/mustache"
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12 mathjax "github.com/litao91/goldmark-mathjax"
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13 "github.com/yuin/goldmark"
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14 highlighting "github.com/yuin/goldmark-highlighting"
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15 meta "github.com/yuin/goldmark-meta"
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16 "github.com/yuin/goldmark/extension"
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17 "github.com/yuin/goldmark/parser"
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18 )
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20 func main() {
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21 var templateFilename string
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23 flag.StringVar(&templateFilename, "tmpl", "", "Template file to render the html inside. The content of the markdown file will replace the placeholder {{content}}.")
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24
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25 flag.Parse()
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26
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27 if flag.NArg() < 1 {
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28 fmt.Println("Please provide a markdown file for parsing.")
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29 os.Exit(1)
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30 }
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31
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32 var useTemplate = false
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33 if templateFilename != "" {
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34 useTemplate = true
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35 }
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36
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37 tmpl, err := mustache.ParseFile(templateFilename)
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38 if err != nil {
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39 log.Fatal(err)
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40 }
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41
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42 source, err := ioutil.ReadFile(flag.Arg(0))
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44 if err != nil {
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45 log.Fatal(err)
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46 }
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47
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48 md := goldmark.New(
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49 goldmark.WithExtensions(
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50 extension.GFM,
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51 highlighting.Highlighting,
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52 meta.Meta,
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53 mathjax.MathJax,
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54 ),
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55 goldmark.WithParserOptions(
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56 parser.WithAutoHeadingID(),
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57 ),
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58 )
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59
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60 var htmlContent bytes.Buffer
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61 parserContext := parser.NewContext()
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62 err = md.Convert(source, &htmlContent, parser.WithContext(parserContext))
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63 if err != nil {
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64 log.Fatal(err)
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65 }
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67 if useTemplate {
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68 templateVars := meta.Get(parserContext)
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69 templateVars["content"] = htmlContent.String()
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71 err := tmpl.FRender(os.Stdout, templateVars)
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72 if err != nil {
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73 log.Fatal(err)
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74 }
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75 } else {
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76 fmt.Print(htmlContent)
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77 }
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78 }