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main.go
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main.go
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// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"bytes"
"encoding/json"
"flag"
"fmt"
"io"
"io/fs"
"log"
"os"
"path/filepath"
"strings"
"gopkg.in/yaml.v3"
)
func usage() {
fmt.Fprintf(os.Stderr, "usage: html2md [file...]\n")
flag.PrintDefaults()
os.Exit(2)
}
func main() {
log.SetPrefix("html2md: ")
log.SetFlags(0)
flag.Usage = usage
flag.Parse()
if flag.NArg() == 0 {
data, err := io.ReadAll(os.Stdin)
if err != nil {
log.Fatal(err)
}
md, err := html2md("<stdin>", string(data))
if err != nil {
log.Fatalf("<stdin>: convert: %v", err)
}
md = strings.TrimRight(md, "\n") + "\n"
os.Stdout.WriteString(md)
return
}
for _, arg := range flag.Args() {
filepath.Walk(arg, func(path string, info fs.FileInfo, err error) error {
if !strings.HasSuffix(path, ".html") {
return nil
}
data, err := os.ReadFile(path)
if err != nil {
log.Fatal(err)
}
var buf bytes.Buffer
if bytes.HasPrefix(data, []byte("<!--{")) {
i := bytes.Index(data, []byte("}-->"))
if i < 0 {
log.Fatalf("%s: missing end of JSON", path)
}
var meta map[string]interface{}
err := json.Unmarshal(data[4:i+1], &meta)
if err != nil {
log.Fatalf("%s: unmarshal JSON: %v", path, err)
}
delete(meta, "Template") // template always on for markdown
for k, v := range meta {
delete(meta, k)
meta[strings.ToLower(k)] = v
}
out, err := yaml.Marshal(meta)
if err != nil {
log.Fatalf("%s: marshal YAML: %v", path, err)
}
buf.WriteString("---\n")
buf.Write(out)
buf.WriteString("---\n\n")
data = data[i+4:]
}
md, err := html2md(path, string(data))
if err != nil {
log.Printf("%s: convert: %v", path, err)
return nil
}
md = strings.TrimRight(md, "\n") + "\n"
buf.WriteString(md)
err = os.WriteFile(strings.TrimSuffix(path, ".html")+".md", buf.Bytes(), 0666)
if err != nil {
log.Fatalf("%s: %v", path, err)
}
println("did", path)
return nil
})
}
}