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annotate wdown.go @ 7:a5aa39557726

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Add parsing of YAML frontmatter
author Jonatan Werpers <jonatan@werpers.com>
date Wed, 17 Jun 2020 12:23:56 +0200
parents a5f397e25cb7
children 4a25b534c81c 1ffe6e4f933c
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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 "github.com/yuin/goldmark"
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13 highlighting "github.com/yuin/goldmark-highlighting"
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14 meta "github.com/yuin/goldmark-meta"
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15 "github.com/yuin/goldmark/extension"
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16 "github.com/yuin/goldmark/parser"
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17 )
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19 func main() {
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20 var templateFilename string
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21
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22 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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23
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24 flag.Parse()
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25
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26 if flag.NArg() < 1 {
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27 fmt.Println("Please provide a markdown file for parsing.")
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28 os.Exit(1)
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29 }
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30
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31 var useTemplate = false
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32 if templateFilename != "" {
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33 useTemplate = true
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34 }
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35
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36 tmpl, err := mustache.ParseFile(templateFilename)
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37 if err != nil {
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38 log.Fatal(err)
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39 }
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40
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41 source, err := ioutil.ReadFile(flag.Arg(0))
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43 if err != nil {
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44 log.Fatal(err)
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45 }
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46
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47 md := goldmark.New(
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48 goldmark.WithExtensions(
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49 extension.GFM,
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50 highlighting.Highlighting,
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51 meta.Meta,
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52 ),
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53 goldmark.WithParserOptions(
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54 parser.WithAutoHeadingID(),
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55 ),
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56 )
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57
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58 var htmlContent bytes.Buffer
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59 parserContext := parser.NewContext()
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60 err = md.Convert(source, &htmlContent, parser.WithContext(parserContext))
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61 if err != nil {
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62 log.Fatal(err)
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63 }
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65 if useTemplate {
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66 templateVars := meta.Get(parserContext)
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67 templateVars["content"] = htmlContent.String()
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69 err := tmpl.FRender(os.Stdout, templateVars)
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70 if err != nil {
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71 log.Fatal(err)
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72 }
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73 } else {
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74 fmt.Print(htmlContent)
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75 }
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76 }