/
md2pdf.go
434 lines (406 loc) · 10.3 KB
/
md2pdf.go
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package main
import (
"fmt"
"os"
"os/exec"
"path/filepath"
"regexp"
"strings"
"time"
"github.com/russross/blackfriday"
"gopkg.in/yaml.v2"
)
// Version as printed with -v option on command line
var Version = "UNKNOWN"
const (
help = `md2pdf [-h] [-v] [-x] [-s] [-t] [-i dir] [-o file] file.md
Transform a given Markdown file to PDF:
-h To print this help page
-v Print version and exit
-x Print intermediate XHTML output
-s Print stylesheet used for transformation
-t Print html output
-i dir To indicate image directory
-o file The name of the file to output
file.md The markdown file to convert
Note:
This program calls xsltproc, htmldoc and faketime that must have been installed`
stylesheet = `<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:output method="xml" encoding="ISO-8859-1"/>
<xsl:param name="title"/>
<xsl:param name="author"/>
<xsl:param name="date"/>
<xsl:param name="id"/>
<xsl:param name="email"/>
<xsl:param name="lang"/>
<xsl:param name="toc"/>
<!-- catch the root element -->
<xsl:template match="/xhtml/body">
<head>
<meta http-equiv='Content-Type' content='text/xhtml; charset=ISO-8859-1'/>
<xsl:if test="$title">
<title><xsl:value-of select="$title"/></title>
</xsl:if>
</head>
<body>
<xsl:if test="$title">
<center>
<h1><xsl:value-of select="$title"/></h1>
</center>
<p align="center"><i>
<font size="-1">
<xsl:if test="$author">
<xsl:value-of select="$author"/><br/>
</xsl:if>
<xsl:if test="$email">
<a href="mailto:{$email}">
<xsl:value-of select="$email"/>
</a>
</xsl:if>
</font>
</i></p>
<br/>
</xsl:if>
<xsl:apply-templates/>
</body>
</xsl:template>
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="table">
<center>
<table border='1' cellpadding='5'>
<xsl:apply-templates/>
</table>
</center>
<p></p>
</xsl:template>
<xsl:template match="pre">
<table width='100%' border='0' cellpadding='10'>
<tr>
<td bgcolor='#F0F0F0'>
<pre>
<xsl:apply-templates/>
</pre>
</td>
</tr>
</table>
<p></p>
</xsl:template>
<xsl:template match="p[img]">
<p align="center" width="80%">
<xsl:apply-templates />
</p>
</xsl:template>
<xsl:template match="img">
<img src="{@src}"><br/><i><xsl:value-of select="@alt"/></i></img>
</xsl:template>
</xsl:stylesheet>`
)
type metaData struct {
Title string
Author string
Date string
Tags []string
ID string
Email string
Lang string
Toc string
Logo string
Header string
Footer string
Margin string
Authors []struct {
Name string
Email string
}
}
func printError(err error, message string) {
if err != nil {
println(message)
os.Exit(1)
}
}
func executeCommand(command *exec.Cmd) []byte {
result, err := command.CombinedOutput()
if err != nil {
println(fmt.Sprintf("Error running command \"%s\":", strings.Join(command.Args, " ")))
println(string(result))
os.Exit(1)
return []byte{}
}
return result
}
func (d metaData) ToMap() map[string]string {
data := make(map[string]string)
if d.Title != "" {
data["title"] = d.Title
}
if d.Author != "" {
data["author"] = d.Author
}
if d.Email != "" {
data["email"] = d.Email
}
if len(d.Authors) > 0 {
data["author"] = d.Authors[0].Name
if d.Authors[0].Email != "" {
data["email"] = d.Authors[0].Email
}
}
if d.Date != "" {
data["date"] = d.Date
}
if len(d.Tags) != 0 {
data["tags"] = strings.Join(d.Tags, ", ")
}
if d.ID != "" {
data["id"] = d.ID
}
if d.Lang != "" {
data["lang"] = d.Lang
}
if d.Toc != "" {
data["toc"] = d.Toc
}
if d.Logo != "" {
data["logo"] = d.Logo
}
if d.Header != "" {
data["header"] = d.Header
}
if d.Footer != "" {
data["footer"] = d.Footer
}
if d.Margin != "" {
data["margin"] = d.Margin
}
return data
}
var locales = map[string]string{
"fr": "fr_FR.UTF-8",
"en": "en_US.UTF-8",
}
func processXsl(tmpFile string, data map[string]string) {
xslFile, err := os.CreateTemp("/tmp", "md2pdf-")
printError(err, "Error creating XSL temporary file")
err = os.WriteFile(xslFile.Name(), []byte(stylesheet), 0644)
printError(err, "Error writing XSL temporary file")
defer os.Remove(xslFile.Name())
params := make([]string, 0, 2+3*len(data))
for name, value := range data {
params = append(params, "--stringparam")
params = append(params, name)
params = append(params, value)
}
params = append(params, xslFile.Name())
params = append(params, tmpFile)
command := exec.Command("xsltproc", params...)
result := executeCommand(command)
err = os.WriteFile(tmpFile, result, 0644)
printError(err, "Error writing temporary file")
}
func markdown2xhtml(markdown string) []byte {
flags := 0 |
blackfriday.HTML_USE_XHTML
extensions := 0 |
blackfriday.EXTENSION_NO_INTRA_EMPHASIS |
blackfriday.EXTENSION_TABLES |
blackfriday.EXTENSION_FENCED_CODE |
blackfriday.EXTENSION_AUTOLINK |
blackfriday.EXTENSION_STRIKETHROUGH |
blackfriday.EXTENSION_SPACE_HEADERS |
blackfriday.EXTENSION_HEADER_IDS |
blackfriday.EXTENSION_BACKSLASH_LINE_BREAK |
blackfriday.EXTENSION_DEFINITION_LISTS
renderer := blackfriday.HtmlRenderer(flags, "", "")
output := blackfriday.Markdown([]byte(markdown), renderer, extensions)
return []byte("<xhtml>\n<body>\n\n" + string(output) + "\n</body>\n</xhtml>")
}
func markdownData(text string) (metaData, string) {
var data metaData
r := regexp.MustCompile(`(?ms)\A---.*?(---|\.\.\.)`)
yml := r.FindString(text)
if yml == "" {
return data, text
}
err := yaml.Unmarshal([]byte(yml), &data)
printError(err, "Error unmarshalling YAML markdown data")
return data, text[len(yml):]
}
func imageDir(text, imgDir string) string {
absDir, err := filepath.Abs(imgDir)
printError(err, "Error getting absolute file path")
r := regexp.MustCompile(`!\[(.*?)\]\(([^/].*?/)*([^/]*?)\)`)
return r.ReplaceAllString(text, "![$1]("+absDir+"/$3)")
}
func absoluteDir(text, filename string) string {
absDir, err := filepath.Abs(filepath.Dir(filename))
printError(err, "Error getting absolute file path")
r := regexp.MustCompile(`!\[(.*?)\]\(([^/].*?)\)`)
return r.ReplaceAllString(text, "![$1]("+absDir+"/$2)")
}
func generatePdf(fileDir, xhtmlFile, outFile string, data map[string]string) {
if data["date"] == "" {
data["date"] = time.Now().Local().Format("20060102")
}
if data["lang"] == "" {
data["lang"] = "fr"
}
params := []string{
data["date"],
"htmldoc",
"--outfile", outFile,
"--size", "A4",
"--bodyfont", "Times",
"--fontsize", "12",
"--headfootfont", "Courier-Oblique",
"--headfootsize", "10",
"--linkcolor", "#0000A0",
"--linkstyle", "plain",
"--permissions", "no-modify",
"--charset", "iso-8859-1",
"--no-title",
"--no-toc",
"--compression=9",
"--embedfonts",
"--webpage",
}
if data["header"] != "" {
params = append(params, "--header", data["header"])
} else {
params = append(params, "--header", "...")
}
if data["footer"] != "" {
params = append(params, "--footer", data["footer"])
} else {
params = append(params, "--footer", "dt1")
}
if data["logo"] != "" {
file := data["logo"]
if !filepath.IsAbs(file) {
file = filepath.Join(fileDir, file)
}
params = append(params, "--logoimage", file)
}
if data["margin"] != "" {
margins := strings.Split(data["margin"], ",")
params = append(params, "--top", margins[0]+"cm")
params = append(params, "--right", margins[1]+"cm")
params = append(params, "--bottom", margins[2]+"cm")
params = append(params, "--left", margins[3]+"cm")
} else {
params = append(params, "--top", "2cm")
params = append(params, "--right", "2cm")
params = append(params, "--bottom", "2cm")
params = append(params, "--left", "2cm")
}
params = append(params, xhtmlFile)
command := exec.Command("faketime", params...)
env := os.Environ()
for i, e := range env {
if strings.HasPrefix(e, "LANG") {
env[i] = "LANG=" + locales[data["lang"]]
}
if strings.HasPrefix(e, "LC_ALL") {
env[i] = "LC_ALL=" + locales[data["lang"]]
}
}
command.Env = env
executeCommand(command)
}
func processFile(filename string, printXHTML, printHTML bool, imgDir, outFile string) {
source, err := os.ReadFile(filename)
printError(err, "Error reading file")
data, markdown := markdownData(string(source))
if imgDir != "" {
markdown = imageDir(markdown, imgDir)
} else {
markdown = absoluteDir(markdown, filename)
}
xhtml := markdown2xhtml(markdown)
if printXHTML {
fmt.Println(string(xhtml))
return
}
tmpFile, err := os.CreateTemp("/tmp", "md2pdf-")
printError(err, "Error creating temporary file")
defer os.Remove(tmpFile.Name())
err = os.WriteFile(tmpFile.Name(), xhtml, 0644)
printError(err, "Error writing xhtml file")
processXsl(tmpFile.Name(), data.ToMap())
if printHTML {
source, err := os.ReadFile(tmpFile.Name())
printError(err, "Error reading temporary file")
fmt.Println(string(source))
return
}
if len(outFile) == 0 {
outFile = filename[0:len(filename)-len(filepath.Ext(filename))] + ".pdf"
}
fileDir := filepath.Dir(filename)
generatePdf(fileDir, tmpFile.Name(), outFile, data.ToMap())
}
func valueIn(value string, list []string) bool {
for _, v := range list {
if v == value {
return true
}
}
return false
}
func main() {
xhtml := false
html := false
imgDir := ""
outFile := ""
file := ""
if len(os.Args) < 2 {
fmt.Println(help)
os.Exit(1)
}
skip := false
args := os.Args[1:]
for i, arg := range args {
if skip {
skip = false
continue
}
if valueIn(arg, []string{"-h", "--help"}) {
fmt.Println(help)
os.Exit(0)
}
if valueIn(arg, []string{"-x", "--xhtml"}) {
xhtml = true
continue
}
if valueIn(arg, []string{"-s", "--stylesheet"}) {
fmt.Println(stylesheet)
os.Exit(0)
}
if valueIn(arg, []string{"-t", "--html"}) {
html = true
continue
}
if valueIn(arg, []string{"-i", "--image-dir"}) {
imgDir = args[i+1]
skip = true
continue
}
if valueIn(arg, []string{"-o", "--output-file"}) {
outFile = args[i+1]
skip = true
continue
}
if valueIn(arg, []string{"-v", "--version"}) {
fmt.Println(Version)
os.Exit(1)
}
file = arg
}
processFile(file, xhtml, html, imgDir, outFile)
}